Preface to the Annual Report of the Materials
and Life Science Experimental Facility for Year 2011

The year 2011 started with the devastating disaster in March. The facility and instruments were
devastatingly damaged. The users were immediately evacuated from the facility to outside, where it
was thought to be safe. It was then, when they heard the sea, near the site, roaring. It was Tsunami.
Very fortunately, however, Tsunami didn’t reach the J-PARC site since the shallow bottom of theseashore mitigated the strength of it.
Tokai is located only 120 km south of the Fukushima reactor. A week after the disaster, a highlevel radioactivity being decreased in the atmosphere, we formed scout teams in order to investigate
damages in the facility. We found most surrounding ground and utilities around the main buildings were
badly subsided or leaned. Biological front shield of instruments was shaken, largely shifted and evencollapsing. The floor of annex building sank enormously, breaking neutron guides at the boundary
between the buildings. MLF staffs were highly motivated to work week after week morning till night.
By the end of June, we were able to speculate the target date to finish the restoration work to be theend of November. Although hard work went on for another six months, finally we successfully had aproton beam at the neutron target in December as we had speculatively scheduled. We have started
facility operation for user program since January 2012, starting at a low power of 100kW. The power ofaccelerator was recovered to its previously highest power of 200kW by February. We have seen manyusers come back to the facility, enjoying their experiments.
The year 2011 was obviously the most regrettable year for all of us, but also astonishing year to see
all the staffs devoting themselves for restoration and completely achieving their goal. Here, I would liketo give my highest appreciation to them for their great efforts. Now we have been achieving 300kW in
December, 2012, and are relaxed and looking forward to new challenges for the future.

Masatoshi Arai
Head of the Materials and Life Science Division (MLF)

This Annual Report – which describes the scientific, technical and organizational activities of the
MLF during FY2011 (April 2011-March 2012) – is the first to be compiled jointly by J-PARC MLF andCROSS-Tokai*.
Consistent with its longstanding policy of promoting open access to major publicly-funded researchfacilities, in March 2011 the Japanese Government appointed CROSS-Tokai as the “Registered
Institution for Facility Use Promotion” to administer and support user operations on the neutron Public
Beamlines at J-PARC MLF.
This appointment was made under the terms of the so-called “Promotion of Public Utilization”
legislation that aims to advance science and technology through effective promotion of the general useof specific world-leading large-scale research facilities. It brings J-PARC MLF into line with the SPring-8
synchrotron radiation and SACLA free-electron laser facility and the K-Computer facility where thelegislation has already been successfully applied.
In practice, this will be achieved by attracting and facilitating use by researchers from around theworld in a wide range of fields that spans from basic and applied research to industrial applications.
On 1 April 2011, CROSS-Tokai commenced activities associated with its role of promoting theuse of the Public Beamlines at J-PARC MLF: the selection of research proposals, the support of user
experiments and the selection and implementation of proposals to build Contract Beamlines put forward
by other organizations.
Our first year of operation has been characterized by building: both as part of the earthquake
recovery effort and also in establishing CROSS-Tokai as a fully functioning organization. I am delighted
with the progress we have made and the team that has been assembled.
CROSS-Tokai is committed to delivering the highest standard of user services via an expert team ofresearch and support staff. The ability of our team to facilitate excellence in scientific outcomes will bestrengthened by the development of new user support mechanisms and an active, robust exchange ofideas with researchers both within and external to the organization.
On behalf of the team at CROSS-Tokai, it is my great pleasure to extend a warm welcome toresearchers from around the world who wish to make use of the Public Beamlines at J-PARC MLF.

Yasuhiko Fujii
Director, CROSS-Tokai* Research Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society
www.cross-tokai.jp

Contents
Preface to the Annual Report of the Materials and Life Science Experimental Facility for Year 2011

The MLF and the Great East Japan Earthquake

From Calamity to Revival

The MLF and the Great East Japan Earthquake – An Overview························································ 2Earthquake Damages to the Utility Facilities and Subsidence of the MLF Building································ 7
Influence of the Earthquake on the Mercury Target System····························································· 9
Cryogenic Hydrogen System····································································································· 11
Recovery of the Proton Beam Transport System from the Earthquake Damage···································13
Restoration of the Shutter System······························································································15
Restoration of the Pre-Shielding for Neutron Beamlines··································································17
Damages from the Earthquake and Recovery of MLF West-Side Extension Building,and BL18 (SENJU) and BL19 (TAKUMI)··················································································19
Recovery Works for BL08 SuperHRPD Beamline··········································································24
Recovery of ANNRI from Damages Caused by the Great East Japan Earthquake································26
Recovery from Earthquake Damage and Progressin the High Resolution Chopper Spectrometer (HRC)·································································27
Return of the Neutron Beam·····································································································28
MUSE - Damage and Recovery from the Earthquake·····································································20
Recovery from the Earthquake – Building and Concrete Shield for MUSE –········································32
Recovery of Superconducting Solenoid from the Great East Japan Earthquake ··································34
Measurement for Deformation of Muon Target by the Great East Japan Earthquake
and Measurement for Thermal Diffusivity of Proton Irradiated Graphite··········································36
Materials and Life Science Experimental Facility
Summary of 11 March 2011 Earthquake Damage and Recovery Action·········································38

Science Highlights
Pulsed Neutrons Light up the Hydrogen-Bond Network and the pH Sensitivity in Human Transthyretin·····42
Spin wave Measurements over the Full Brillouin Zone of Multiferroic BiFeO3·······································44
Characterization of Swollen Brush Structure in a Solvent by SOFIA Reflectometer·······························46
Neutron Diffraction in 40 T Pulsed High Magnetic Fields at MLF J-PARC············································48
Magnetic Excitation Spectra of Superconducting Ca10Pt4As8(Fe1-xPtxAs)10 (x~0.20)·······························50
A New Solid Electrolyte Li10GeP2S12 for Li-Ion Batteries···································································53
Quantum Renormalization Effect in One-Dimensional Heisenberg Antiferromagnets·····························54

Facility Research and Development Highlights
Effect of the Si Interlayer on the Magnetic and Mechanical
Properties of Fe/Ge Polarizing Multilayer Mirrors·······································································58
Multiwire-type Two-dimensional Neutron Detector with
Individual Readout and Optical Signal Transmission System·······················································60

Damage Inspection of the 1st Mercury Target Vessel of JSNS··························································62
Radiation Safety·····················································································································64
Time-Transient Measurement of Hydrogen Absorption Process by NOVA···········································66
Development of Remote Access································································································68
Current Status of Sample Environment at MLF·············································································70
Development of an in-situ SEOP 3He Neutron Spin Filter································································72
Status of the Muon Kicker System at D-line··················································································74
Development of a Time Projection Chamber for the Precision Neutron Lifetime Measurement················76

What's new at the MLF ?
CROSS-Tokai························································································································78
BL02: Si Crystal Analyzer near Backscattering TOF Spectrometer DNA·············································84
Development of BL09 SPICA····································································································86
BL11: Completion of High Pressure Neutron Diffractometer PLANET·················································88
Development and Commissioning of TAIKAN···············································································90
Polarized Neutron Reflectometer SHARAKU Started User Program··················································92
Commissioning of BL18 SENJU·································································································94
TAKUMI at BL19·····················································································································96
Radiation Shield of U-Line········································································································98
Status of the Superomega Muon Beamline················································································ 100

Facility Report
Beam Operation Status at MLF································································································ 104
Users at MLF······················································································································· 106
Proposal Review System········································································································ 107
MLF Proposals Summary – FY2011························································································· 108
MLF Division Staff 2011········································································································· 110
CROSS-Tokai Staff 2011········································································································ 112
Committee and Meetings········································································································ 113
The Government Review of J-PARC························································································· 120
Award List··························································································································· 121
MLF Publication 2011············································································································ 122

Organization Chart
Organization Chart of
J-PARC Center

Organization Chart of
CROSS
CROSS is "Registered Institution for Facility Use
Promotion" for the public-access neutron
beam facilities at J-PARC.

Director,
J-PARC Center
Deputy Director,
J-PARC Center
Deputy Director,
J-PARC Center
Accelerator Division

President
CROSS Head Oﬃce
Director,
CROSS-TokaiMLF Division

Science Coordinators

Materials andLife Science Division

Safety Division

Neutron Source Section

Administration
Division

Neutron Science Section

Utilization Promotion
Division

NeutronInstrumentation Section
Muon Science Section
Particle and Nuclear
Physics Division
Transmutation Section
Cryogenics Section
Safety Division
Management
Supporting Section
Information System
SectionPublic Relations Section
Administration Division
User Oﬃce Team

Neutron R&D Division

J-PARC MAP
N
245

245

D2 Instrument

D1 Instrument

Decay/Surface Muon

Ultra-Slow Muon

Muon Instruments

DM

CM Coupled moderator

CM

CM

BL21: NOVA

BL01: 4SEASONS

BL19: TAKUMI

BL20: iMATERIADM

Neutron Source

PM Poisoned moderator

Coupled moderator

Neutron Target

Decoupled moderator

Poisoned moderator

BL02: DNA

BL03: iBIX

BL04: ANNRI

BL05: NOP

BL18: SENJUPMPMDM Decoupled moderator

BL17: SHARAKU

BL16: SOFIA

BL15: TAIKAN

BL14: AMATERAS

BL12: HRC

BL11: PLANET

BL10: NOBORU

BL09: SPICA

BL08: SuperHRPD

Neutron Instruments

The MLF and the Great East
Japan Earthquake – FromCalamity to Revival

The MLF and the Great East Japan Earthquake – An Overview
The Earthquake and Tsunami
At 2:46 pm on the 11th of March 2011, easternJapan was rocked by a massive magnitude 9.0 (Mw)earthquake. Centered on a location about 70 km
east of the Oshika Peninsula off the coast of Miyagi Prefecture, the earthquake caused widespread
damage and major disruption throughout easternJapan. The tsunami waves triggered by the undersea megathrust quake wreaked devastation along
the Tohoku Pacific coast.
Although the epicentre of the quake was a little
over 250 km from Tokai, the impact of this enormous
seismic event was extensive with serious damage
to some buildings and infrastructure being sustained in the local area. J-PARC and the MLF were
not spared from the effects of the disaster. Although
J-PARC was protected from the 4.5 m tsunami thatstruck the Tokai coastline by an 8 m high sea wallthat borders the site, it could not, however, escape
the impact of the violent quake.
This overview provides a synopsis of events at
and around the MLF starting from the time of theearthquake up until the restoration of the experimental program at J-PARC ten months later.
The MLF on the day of the earthquake
On the day of the earthquake, the MLF was in ascheduled shutdown and, consequently, the number of facility users on site was comparatively few.
Being close to the end of the fiscal year, however,the facility was alive with activity; MLF staff and contractors were busily working on a variety of installation, testing and commissioning projects associatedwith the beamlines and supporting facilities.
The earthquake and immediate aftermath
The major shaking of the earthquake subsided
after about 3 minutes, by which time 500 km of fault
line along the Japan Trench had ruptured. Thousands of aftershocks would follow – many of thempotentially damaging to already compromised structures.
The immediate priority was to safely evacuate2

the MLF building. The seriousness of the situation
was instantly obvious to all and the evacuation was
rapidly completed with staff and contractors callingout to their co-workers and making their way out of
the building via both normal and emergency exits.
The experimental hall had been plunged into darkness due to the loss of power and the evacuation
was effected by the emergency lighting with power
provided only by backup supplies.
People made their way to the initial evacuationassembly area: the carpark outside the MLF main
entrance. The process of accounting for everyone
who had been in the MLF at the time of the quake
was commenced using the Personnel Entry Recordthat had been retrieved from the access control
point during the evacuation.
Amid continuing aftershocks and before the headcount could be completed, it became known that atsunami alarm had been issued. Amidst confusion
and uncertainty caused by inaccurate and differing
media reports and realizing that the MLF evacuation assembly area was not high enough above
sea-level to guarantee safety in the event of a major tsunami, the group who had evacuated from the
MLF made their way to the relatively high ground of
the HENDEL Building – about 0.5 km away – andonce again began the process of confirming thesafety of all who had been in the MLF at the time ofthe earthquake.
Meanwhile, similar events were taking place atthe HENDEL Building where staff had sought shelter under their desks during the most violent shaking before fleeing the building as best they could.
The building suffered significant structural damage;the 2nd floor passageway became impassable andat least one car parked outside was damaged byfalling debris.
With no hand-written entry record and no way toprint a hard copy, the head count at HENDEL wasconfused and time-consuming. This situation wascompounded by the actions of some visitors wholeft the assembly area before the safety of all could
be confirmed.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

The disaster readiness of the facility was tested during the initial response period. Emergency
equipment including torches, transceiver handsets,
staff lists, radios and megaphones that had been instorage at the designated evacuation assembly areas were put into service as the site-wide response
gathered pace.
By evening on the 11th of March, all staff, users
and outside contractors had been accounted for.
The situation was, however, quite desperate; there
was no power or running water and telephone services that were not cut were hopelessly jammed.
Roads were damaged and in some places impassable. There was no public transport and the expressway was closed. Even leaving the JAEA site
by car was impossible as the exits and surrounding
roads became grid-locked; many abandoned theirvehicles after attempting to leave for several hours.
An air of worry and despair hung over the facility
as people tried desperately to make contact withloved-ones and find a way home.
Emergency supplies of water, food and blankets
were available in the Tokai Dormitory where many
– including foreign users – spent the night sleeping
on the floor. Others left the site on foot in search of away home or somewhere to spend the night. Manyfrom the JAEA site bedded down on the first nightat a local community center which had become an
emergency shelter.
In and around Tokai
Compared to the devastation that the earthquake and tsunami had caused in regions further
to the north, the Tokai area was relatively well off.
Nevertheless, it would be days and weeks before
essential utilities and transportation links were reestablished.
In the early days after the earthquake, drinking
water was in short supply and without any refrigeration, perishable food items soon spoiled. The luxuries of everyday life were soon forgotten as securing water for drinking and sanitation and energy forheating and cooking became the priorities. Queues
formed outside the few stores that were able toopen as residents attempted to purchase essential
items.
The situation was exacerbated by the shortageof fuel for motor vehicles that developed in the initialaftermath. Cars and trucks queued for hours to purchase even a small quantity of fuel and many petrol
stations simply ran out of supply and closed theirdoors. With the expressway cut and local roads
jammed, it was taking more than 4 hours to travel
between Tokai and Tsukuba – a journey that would
normally take less than an hour. J-PARC operated
a minibus shuttle service to move staff between thecampuses.
The local electricity supply was restored on 14
March – 3 days after the earthquake – but it was
not until 24 March that town water was completely
restored. The expressway that links the Tokai area
to Tsukuba and Tokyo was re-opened to the public
on 21 March but the train service from Tokai Station
did not resume until 7 April. By the end of March,
the fuel shortage was largely over and movementby car was again possible: albeit restricted by damage to roads that would not be addressed for many
months.
Initial Response and MLF Damage Assessment
The first priority was to confirm the safety of all
staff and visitors. While dealing with their own personal situations, MLF management spared no effort
to make contact with every member of staff either
by phone or email. It was with great relief that thewell being of all staff and visitors was confirmed. By
13 March, J-PARC had assisted all foreign users
to evacuate to the relative safety of Tsukuba or to
Narita Airport from where they could leave for theirhome countries.
On 17 March the first inspections to establish thedegree of damage inside the MLF were carried out
by torchlight and the coordinated process of damage assessment started on 22 March.
The first scout teams found that most of theground surrounding the MLF building had significantly shifted and subsided by up to ~1.5 m causing serious damage to utilities infrastructure. Within
the MLF itself, there was toppled equipment andelectronics racks and unsecured items – including
in some cases experimental samples – were strewn
around the floor. It soon became clear, however,that the impact of the earthquake was far more serious than such superficial damage.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

3

Figure 1. Ground subsidence around the MLF building©KEK

At an early stage, it became apparent that theentire shielding structure of the MLF – nearly 2,500
tonnes of material – had been displaced. The massive blocks that comprise the radiation shielding forthe target and beamlines were shifted, damaged
and, in some cases, had even fallen over or collapsed. At several points around the experimental
hall the violence of the earthquake had left shielding
blocks sitting precariously over thoroughfares andequipment. As a result, access to the MLF had tobe restricted because of the danger posed by thecontinuing aftershocks.
Though severely shaken by the earthquake, theMLF main building was largely protected by the
deep foundation piles on which it sits. The annex
buildings that house beamlines BL08, BL09 BL18
and BL19, however, are of surface concrete-slab
design and subsequently susceptible to any shiftingor subsidence of the ground beneath. As a result,these structures were displaced both laterally andvertically destroying neutron guides at the building
boundaries with the MLF and causing severe damage to the beamlines and instruments.
Toward Recovery
Starting on Monday 28 March, the Beamline
Recovery Meeting was convened every morning
at 9 am. This gathering served as the focus point
for ongoing damage assessment activities and information gathering and distribution. Over time, thedaily meeting morphed into the nerve center for the
management and coordination of recovery work.

4

In an announcement made on 20 May 2011, JPARC Director Shoji Nagamiya laid out his ambitious
plan to have the J-PARC accelerators operating again
before year’s end and to resume user operations by
the end of January 2012. At the time, there was widespread disbelief among both J-PARC staff and outsiders that such a rapid recovery was possible.
Thus began the daunting task of restoring the
MLF to operational status and resuming the strategic growth plan. In a truly team effort, the staff andmanagement of the MLF demonstrated unflagging
determination and industry towards their common
goal. The work plan was structured such that restoration activity continued every day – very often in
double shifts and on holidays and weekends. Detailed descriptions of the major recovery projects
appear elsewhere in this report.
In anticipation of a successful on-schedule recovery, the MLF announced a Call for Proposals
for the 2012A operations period in mid-November
2011. The user community showed similar confidence with 155 General Use applications being
submitted by the deadline in December.
Return of the beam
True to his promise to restart the accelerators
at J-PARC within calendar 2011, at noon on 9 December 2011, Shoji Nagamiya pressed the button
that sent the first proton beam since the earthquake
accelerating along the linac.
The Rapid-Cycling Synchrotron (RCS) followed
soon after and on 22 December 2011, a 3 GeV
proton beam was successfully transported via the
3NBT facility to the neutron production target. On
the following day, the first neutron beam in the MLF
since the earthquake was observed at NOBORU –the JSNS diagnostics and testing beamline. The
measurements at NOBORU confirmed the intensityof the beam to be the same as before the forced
shutdown.
On 17 January 2012, most of the beamlines that
had been in operation prior to the earthquake (BL01,
BL03, BL04, BL05, BL10, BL11, BL12, BL14, BL15,
BL16, BL20 and BL21) were checked for radiation
safety and received permission to resume operations. The last daily Beamline Recovery Meeting
was held on the morning of the following day.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Figure 2.	Profile of the proton beam delivered to the MLF
neutron target during the first beam study after theearthquake

Beamlines that had been newly completed during the recovery shutdown (BL02, BL09, BL17 andBL18) were inspected and received permission tostart commissioning operation at the end of January.
BL19 and BL08 that had been heavily damaged,
returned to service in March. BL08 reported a similar beam intensity as during pre-earthquake operations while BL19 experienced a 30% increase inbeam intensity thanks to a re-alignment during therecovery period.
After further checking and re-commissioning the
2011B MLF User Program began on 24 January 2012.

Appreciation to our Colleagues
In the wake of the 11 March 2011 disaster, JPARC received expressions of concern and support
from hundreds of our colleagues from both within
Japan and overseas.
The MLF was similarly supported. We take thisopportunity to express our sincere gratitude to all
the facilities who generously offered beamtime andother material support to the MLF and our user community during the time that we were out of action.
We were all very much moved by the heartfelt concern and the generosity of the assistance that wasforthcoming.
We would like to express a big “Thank-you” to:•	SNS, Oak Ridge National Laboratory, USA•	LANSCE, Los Alamos National laboratory, USA•	Rutherford Appleton Laboratory, UK•	Centre for Molecular and Materials Science,
TRIUMF, Canada•	Paul Scherrer Institute (PSI), Switzerland•	Australian Nuclear Science and Technology Organisation (ANSTO), Australia•	Korean Atomic Energy Research Institute(KAERI), South Korea•	SPring-8, RIKEN, Japan•	The Institut Laue-Langevin, France•	Kyoto University Research Reactor, Japan

Figure 3.	Scenes of celebration in the MLF Control Room as the proton beam is accepted for the first timesince the earthquake – 22 December 2011

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

5Figure 4.	J-PARC Director, Shoji Nagamiya, marks the return of the beam to the
MLF with a traditional “Daruma no Me-ire“ ceremony – 22 December 2011

The Road ahead…
It would be disingenuous to pretend that thephysical and psychological impacts of the events ofMarch 2011 do not still linger; there remains repair
and recovery work to be done and the process ofmental healing is ongoing.
Nevertheless, we are delighted to report that
thanks to the tremendous effort of our staff and the
support of our colleagues worldwide, J-PARC andthe MLF have been restored to fully operational sta-

6

tus and the science program has re-commenced.
More than that, the staff have taken advantage ofthe shutdown and recovery period to upgrade facilities and install new equipment. Accordingly, theMLF has not just recovered but is in fact moving
ahead. We are all pleased to be back on the path ofdeveloping J-PARC toward its full potential.
We look forward to reporting exciting research
results and further progress in coming reports.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Earthquake Damages to the Utility Facilities and Subsidenceof the MLF Building

Utility Facilities
The Great East Japan Earthquake on March
11, 2011 shook the J-PARC site furiously and thesurrounding ground of the MLF building subsided
enormously. All the pipes of the water supply, waste
discharge and pressurized air were severely damaged and torn off just outside of the main building
as shown in Figure 1.

were thoroughly examined and the electricity supply resumed by the end of March.
The recoveries of the water supply pipes and thewaste discharge pipes took longer, since the surrounding ground had to be dug over to examine thedamages and to fix them (Figure 2). The water supply was restored gradually till the end of August.

Figure 2. Restoration work for a drain pipe.

Figure 1.	Ground surrounding the MLF building subsided ~1m (top) and the pipes of the water supply and water drain were torn off.

The electricity supply stopped soon after theearthquake. The emergency power generator was
successfully started and the air circulation system
kept the hot cell at negative pressure properly. [1]The inspection started several days after theearthquake. First of all the electricity power lines

Level differences before and after the earthquake
Figure 3 compares the level differences of the
MLF measuring points between before and after theearthquake. The levels inside the main MLF building were changed little, less than 10 mm. However,
the extension buildings to the experimental halls
subsided significantly by around 100 mm. Large
steps appeared at the building joints. Consequently
the shielding blocks leaned and the neutron guidetubes were broken in those areas.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

7

Figure 3. Level differences between before and after the earthquake (in mm).

Reference[1]	K. Sakai et al. “Influence of Great East Japan
Earthquake on Neutron Source Station in
J-PARC,” JAEA-Technology 2011-039, 2012,
in Japanese.

S. Sakamoto, and M. Harada
Neutron Source Section, Materials and Life Science Division, J-PARC Center

8

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Influence of the Earthquake on the Mercury Target System

Structure of the devices related to the damages
on the target system
The helium vessel is installed to keep the helium
atmosphere at the center of the spallation neutron
source, where the irradiation of the atmospheric gas
by the strong radiation field should be prevented,
as shown in Figure 1. The inner components suchas the reflector, the moderators, and the radiation
shield blocks are placed in the helium vessel, andthe mercury target vessel is inserted into the helium
vessel during the proton beam operation period. Inorder to isolate the helium atmosphere in the helium
vessel from the air atmosphere in the maintenancearea, the helium vessel seal system is mounted on
the mercury target vessel. The helium vessel seal
system consists of metal bellows, a base plate anda metal O ring as shown in Figure 2. When it is actuated, the interspace between the metal bellows ispressurized with helium gas to 0.9 MPa, then themetal O ring on the base plate is pushed onto theseal plane of the helium vessel. The total pushingforce reaches 18 tons and the same counterforce
is loaded onto the target trolley as well. Thus thetarget trolley is equipped with a clamp system asshown in Figure 3, which prevents the target trolleyfrom moving away from the beam operation position.

Figure 1. Helium boundary of the helium vessel.

Figure 2. Detail of the helium vessel seal system.

Figure 3. Clamp system of the target trolley.

The clamp system consists of a rod to receive
the counterforce and an air cylinder to change therod position. When the rod is moved upward by the
air cylinder, the target trolley position is fastened by
the rib contacting with the rod, and when the rod
is moved downward, the clamp system is released.
The pressurized air, which is fed to the air cylinder
is supplied from the facility utility system.
Situation of the target system after the earthquake
The mercury boundary of the target system was
not damaged by the earthquake. The mercury sensors, the thermocouples, the pressure sensors, andthe electrical devices were also intact. Part of thelining plates of the radiation shielding blocks of thetarget trolley were stripped off and fell on the floor,
but the influence of those plates was negligible. The
only serious trouble was the damage to the helium
vessel seal system.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

9Figure 4. System data before and after the earthquake.

Figure 4 shows the target trolley position andthe helium pressure supplied to the helium vessel
seal system with the time before and after the earthquake. When the earthquake occurred, the target
trolley was at the beam operation position and theclamp system was in a clamped position. At 14:46
when the first attack came, the target trolley moved
several mm but it was kept at the same positionby the clamp system, but when the second attack
came at 15:16, the target trolley moved 380 mm
away from the beam operation position. That wascaused by the damage to the air supply line of the
facility by the second attack, and the air pressure
to raise the rod of the clamp system to the fastening position was lost. The target trolley was swayedby the earthquake, which detached the rod of theclamp system from the rib, then it was released by

the dead weight of the rod and the target trolley
was pushed with the counterforce of 18 tons. The
bellows of the helium vessel seal system extended
over the upper limit and fractured, which reduced
the helium gas pressure. Because the helium vessel seal system is welded on the mercury target
vessel, the target vessel became useless.
Replacement of the mercury target vessel
The target vessel replacement was the first large
scale remote handling operation after the MLF received the first beam in May 2008. The operation
was carried out from November 21 to 30 and it
needed 7 days, except the seal performance test.
Finally we could replace the used target vessel witha new one successfully, and the target system began its operation again.

K. Haga, T. Wakui, H. Kogawa, T. Naoe, K. Hanano, H. Kinoshita, M. Seki, and T. Suzuki
Neutron Source Section, Materials and Life Science Division, J-PARC Center

10

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Cryogenic Hydrogen System

Introduction
The Great East Japan Earthquake occurred on
March 11th. At the time, the cryogenic hydrogensystem was operated for RUN#38. The cryogenic
system was stopped by the interlock system without any problem. A helium buffer tank (50m3), a cold
evaporator (18m3) and a cooling tower leaned toward the MLF building due to the ground sinking by
about 0.7 m. Although the gas supply pipes that penetrated the building wall were bent into an S shape
as shown in Fig.1, there was no hydrogen leak fromthem. Later in 2011, the cryogenic hydrogen system
was restored and the proton beam operation resumed in December without any delay (Fig.2).

OutsideMLF building

Besides, a purification system for a helium refrigerator has been installed in order and its operational
instability caused by impurities such as water has
been resolved.
Restoration after the Great East Japan Earthquake
The electric supply to the MLF was restored inearly April. We were able to start the investigationof the damage situation of the cryogenic hydrogensystem in the radiation controlled area. It was confirmed that it had no damage, although the outside
area was affected by the ground sinkage.
In July, the inclined tanks were temporally removed and the ground sinkage and their inclined
foundation were restored as shown in Fig.3.
After September, we started reinstalling thetanks and restored the deformed pipes. The work
was finished by mid-November (Fig.4).
In early December, we conducted an off-beamcommissioning and managed to restore the cryogenic system to its former state. We successfully
resumed the 120 kW proton beam operation asscheduled.

Figure 1. Deformed pipes due to ground sinkage.

FY2011
4

5

6

7

8

9

10

11

12

1

2

3

Repair constriction of ground
Remove oftank and pipes

Repair constrictionof tank and pipes

Preparation ofoperation

Investigations of damages-Accumulator-Censors

Test run of He
compressor

Cryogenic H2 system operation
30 7 19 28

MLF beam operation
22 26

Cleaning ofcold box(RUN#39)

23 29

26

18

22

2

22

(RUN#40)䕰Inspection & permit to exchange the accumulator(for regulation of high pressure gas)

15

(RUN#41)

䕰-Appearance-Leak-Valves-Turbine-PumpsFigure 2. Events of the cryogenic hydrogen system in FY2011.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

11

Pressure drop around heat exchanger (kPa)

Figure 3. Temporarily removing the helium buffer tank.

Installation of a helium purifying system
So far, we had a problem with the unstable operation of the helium refrigerator, which was caused
by impurities such as moisture [1]. In RUN#35, thepressure drop through a heat exchanger increased
up to more than 100 kPa within one week after thecool-down operation as shown in Fig. 5. This isbecause impurities attached to its surface brought
about deterioration of its cooling power. Accordingly,
we installed a purification system for the helium refrigerator, which had a dryer, a cryogenic adsorberand a heater for regeneration (Fig.6).
Before the cryogenic operation, the purificationin the helium refrigerator had been carried out for aweek. We succeeded in stabilizing the operation of
the helium refrigerator in one-month long-term proton beam operation (RUN#40) for the first time.

(a) After the earthquake (Mar.)㻝㻞㻜㻝㻜㻜
RUN#35(Oct. 2010)

㻤㻜
㻢㻜
㻠㻜

RUN#40(Jan.-Feb. 2012)

㻞㻜
㻜
㻜

㻡

㻝㻜

㻝㻡
㻞㻜
Time (day)

㻞㻡

㻟㻜

㻟㻡

Figure 5.	Transition of the pressure difference in RUN#35
and RUN#40.

Heater unit(b) Foundation work (Aug.)

Cryogenic
adsorberunit

Drier unit

Figure 6. Helium purifying system.

(c) Completion (Nov.)
Figure 4. Repair construction around the helium buffer tank.

References[1] MLF Annual Report 2010, p.36-38 (2011).

T. Aso, H. Tatsumoto, S. Hasegawa, K. Ohtsu, T. Uehara, Y. Kawakami, and H. Sakurayama
Neutron Source Section, Materials and Life Science Division, J-PARC Center

12

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Recovery of the Proton Beam Transport Systemfrom the Earthquake Damage

Due to the Great East Japan Earthquake on
March 11th 2011, the beam transport system wasterribly damaged. For instance, the air rushed into
the vacuum system of the beam transport system.
Several minutes later, due to the stop of helium supply to the pillow seals located around the muon production target, the vacuum seal performance wascompletely lost. Consequently, the air rushed into
the vacuum system from the downstream section. In
order to prevent the air from rushing into the vacuum
system, fast closing valves (FCV1 and 2) were installed as shown in Fig 1. During the earthquake,the loss of compressed air supplied to the drive of
the valve caused by the fact that the earthquake
vibration broke the transfer tube located outside of
the building, made the fast closing valve of FCV2 located at downstream inactive. Fortunately, the otherfast closing valve of FCV1 continued to function normally, so we avoided the loss of vacuum. Without thefunctioning of FCV1, the accelerator could have suffered critical damage, which might have prolonged
the recovery time. We learned the importance of
redundancy. When assessing the damage to thevacuum system, our main concern was the possible
damage to the pillow seals at the M2 tunnel and theproton beam window. However, the leak examination confirmed that the seals were functioning well.

Not closed
due to lost of air

Exit of RCS
FCV1around the expansion joint collapsed significantly,
as shown in Fig 2. Above the tunnel, the embankment soil on the expansion joint also collapsed significantly. Inside the tunnel, the suspension cranehas also been damaged seriously. The bolts of therail for placing the crane on the cell were cut due
to the earthquake vibration as shown in Fig 3. The
repairs of the construction structure damage, took
longer even though the restoration works continuedat end of September.

Figure 2.	Collapsed wall by the Great East Japan Earthquake at the expansion joint in the tunnel.

ProtonBeamWindow

FCV2

Heliumvessel

P1

P2

P3

P4

P5

P6

P7

Figure 1.	Schematic drawing of vacuum system of thebeam transport system.
Figure 3.	Broken bolts for the rail of the suspension cranedue to the vibration.

The building for the beam transport sufferedserious damage. Around the expansion joint section, where the structure of the tunnel is isolated,
terrible damage was found. The wall of the tunnel

Due to the vibration of the earthquake, themagnet was displaced by several cm. An uneven

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

13

settlement was observed in the beam line. At thedownstream section, depression of 12 mm was observed. Even with the presence of such large depression, the good flatness of the beam line was stillpreserved. In order to adjust the geometrical condition, the beam components were aligned in thetilting plane. After the tunnel was repaired, the alignment of the magnets started, and it must be completed with a short deadline of 3 months in order tocomply with the schedule. The alignment work has
continued even at midnight. We will begin beam operation with power of about 100 kW. It was expected
the beam loss would increase because of the missalignment at the rapid cycling synchrotron (RCS),
where realignment was not performed due to somedifficulties.
Due to our devoted efforts, all restoration works
on the beam transport system were finished in December 2011 as scheduled. The beam commission-ing started again. With only one shot of the beam,
we succeeded in delivering it. A memorable proton
beam profile 1st shot of the beam profile on the target
after repairing the damage is shown in Fig 4. Due tothe distortion of the geometrical configuration existing before earthquake, the beam position without
tuning of the magnet has shifted. After adjustment,
the beam properties were measured. It was recognized that the observed beam emittance was similar to the one before the earthquake. Furthermore,during the beam study it was demonstrated thatseveral shots of beam with equivalent beam powerof 450 kW were introduced into the target withouta significant beam loss. After the completion of thebeam studies, we started beam operation for users
and increased the power gradually. In March 2012,
the beam power reached 200 kW, which was thesame as the power before the earthquake. Finally
we overcame the difficulties.

Figure 4.	Observed beam profile on the mercury target as 1st shot after
restoring.

S. Meigo1, M. Ohi1, K. Ikezaki1, A. Akutsu1, H. Fujimori2,3, and S. Sakamoto1
1
Neutron Source Section, Materials and Life Science Division, J-PARC Center; 2Muon Science Section, Materials and Life Science Division,
J-PARC Center; 3Institute of Materials Structure Science, KEK

14

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Restoration of the Shutter System

Introduction
On March 11, the primary shutters of beam line(BL-) 01, 03, 04, 05, 08, 10, 11, 12, 14, 15, 16, 19, 20
and 21 were being hung at the closed position, while
the others were landed on a base. The earthquake
did not damage the MLF shutter system [1] severely,
however, the vacuum of the shutter inserts of BL-01,
03, 04, 05, 11, 14, 15, 16 and 19 was broken.
In April and May, the shutter inserts of BL-01,
02, 05, 12, 14, 15 and 16 were investigated and we
identified the origin of the vacuum break. None of
the aluminum vacuum ducts, which contain a neutron guide tube or a steel collimator as an inclusion,
had any cracks or ruptures, but the bolts which fasten an aluminum window to a flange using a metal
O-ring were loosened.
Analysis
This was the first occurrance of heavy air leakage
in the shutter system. As shown in Fig. 1, we found
impact scars on most of the leaked aluminum window
facing on protrusions of the inclusion. This told us thatthe inclusion of each vacuum duct was shaken by
the earthquake, and the protrusions struck the bolted
aluminum window. This impact motion loosened thebolts fastening a metal O-ring of the flange. The shutter insert itself protruded little from the shutter blockby a fixing bracket, however, bolts of the bracket werealso damaged by the motion of the insert.

Figure 1.	Picture of an inner side of an Al window. Scars
are indicated by red arrows.

Review of the O-ring of the duct
The shutter inserts were more or less radioactivated and their sealing groove and surface were
somewhat scratched after usage of the initial metal
O-ring. Actually, the vacuum seal attempt by using a
fresh metal O-ring was unsuccessful while a tentative rubber O-ring worked well. Then we reviewed
the radiation hardness of the EPDM rubber O-ring.
The absorbed dose of the EPDM rubber was calculated using the PHITS code with a geometry model
shown in Fig. 3.

Figure 2. Cut view of a beam duct in a shutter block.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

15

Figure 3.	Structure model for the absorbed dose calculation of the EPDM
rubber at O-ring position.

Figure 4. Improvements of the sealing and its surrounding parts.

Table 1.	Estimated absorbed dose of the EPDM rubber after
1-year operation at 1 MW.

SourceAperture size[mm]Absorbed dose by
1 MW･y [MGy]BL01

90 x 900.0468BL10100 x 1000.0264

Following the calculation result and the advice of
the J-PARC accelerator experiencer, we finally decided to replace the metal O-rings with radiation-resistant EPDM rubber ones (HAYAKAWA rubber 355
EB) which can hold its function over 10 MGy [2].
Additional improvements were applied as shown in

Fig. 4. A hard-loosen type washer (Nord-lock washer) was added to the bolt, a dumber sheet was attached on the face of the protrusions, and a fixing
bracket was modified to prevent bent motion on thebolts.
From August 1 to October 6, we handled shutter
inserts of BL-01, 02, 03, 04, 08, 10, 11, 12, 14, 15,
16, 17, 18, 19, 20 and 21. New inserts for BL-05 and
09 were also installed in October. The restoration of
the shutter system was completed in mid-November.
References[1] JAEA-Technology 2011-035 (2011).
[2] JAEA-Technology 2011-039 (2011).

K. Oikawa, F. Maekawa, M. Harada, and H. Takada
Neutron Source Section, Materials and Life Science Division, J-PARC Center

16

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Restoration of the Pre-Shielding for Neutron Beamlines

Introduction
The strong shaking caused by the gigantic
earthquake of March 11 damaged significantly the
pre-shielding of MLF. We restored a large quantityof pre-shielding blocks for the planned J-PARC restart by the end of 2011 and resolved the problems
caused by the earthquake in a short period of time.
Pre-shielding of the MLF neutron beamline
The pre-shielding is a beamline shielding of a partof the beamline of upper stream. The pre-shielding isa shielding block constituting a tunnel of 1 m in width
2 m in height between 7 m – 12 m from the center ofneutron target/moderator of the neutron beam lines
which are installed in 23 lines in MLF radially.
There are two kinds of shielding blocks, and oneof them serves as a wall and pillar at the side block.
Another upper block is used as the roof between
the side blocks. The total number of the side shieldings is 280, and the upper shieldings are 248. The
weight of each block varies from 3 to 7 tons. The
total weight of the pre-shielding reaches 2772 ton.

Figure 1. Pre-shielding of neutron beamline.

Figure 2. Upper block in a critical state.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

17

The pre-shielding suffered the following consequences due to the strong shaking from the earthquake. 1) A side slip of the foot-block which fixes
a side block to a floor with M24 bolts. 2) The all
around gaps between the side blocks were moved.
3) A degree of leaning of the block due to the movement of the shim of first construction.
The movement of these side blocks caused
the following problems, 1) The upper blocks wereon the edge of falling (very dangerous state). The
equipments in the beamline were nearly damaged.
2) The positions of the internal setting equipments(guide tubes, choppers) were moved due to the side
block pushing out. They needed to be re-aligned. 3)
Setting position disorder of the whole pre-shielding.
Reconstruction
We gave top priority to ensuring safety while theaftershocks continued, and it was impossible to enter under the upper block which was about to fall.
We prepared an iron structure device, which wewere able to insert from the side and carried out
the work safely even though the block fell during
the demolition work. After removing the dangerous
situation, we started the repair work of the blocks
which had slipped off. Almost all cover blocks weremoved. We investigated the cause of that damage
to the pre-shielding and decided to plan the restoration while taking measures.
As a result, the measures taken to deal withthese issues are as follows. 1) Since the fit part ofthe stack is too big, a gap is easy to be accumulatedby the multistage configuration of the blocks. Thus,
we reduced the gap of the fit part by the special

spacer, or through fixation by a plate on an addition.
2) Depending on a beam line, the upper block which
is on the top may drop if the side block shifts. Thus,
we prepared a bracket to prevent the block fromdropping even if a gap caused by an earthquake
occurrs.
The work consisted of dismantling a shielding
block by a crane, performing threading processing
on the site, and setting a shielding block to its correct position as needed while adjusting a gap by
the spacer. Unlike the initial shielding block installation, the restoration construction was performed in
conditions where the equipments such as the guidetubes, optical equipments, and choppers have already been installed. Therefore various problems
occurred and we examined their relevance pushing
forward the construction each time. For example,
we could not lift the block which was outside of theoperating range of the crane. Or we scraped off thewelding of the positioning mechanism because ofan obstacle to move it aside.
The pre-shielding restoration construction used
exclusively the crane of the MLF experiment hall,and other crane work was not possible at the sametime. For these reasons, we had to complete it assoon as possible it was the first priority because it
became the basis for all repair work in the experimental hole of MLF. We carried out the repair workby both day and night shifts, and it continued forapproximately three months. At last, after the preshielding repair work was completed, we started
the restoration construction of the main body of thebeam line. That was in mid-September, 2011.

W. Kambara, and Y. Yamauchi
Neutron Science Section, Materials and Life Science Division, J-PARC Center

18

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Damages from the Earthquake and Recovery of MLF West-Side
Extension Building, and BL18 (SENJU) and BL19 (TAKUMI)

Introduction
The extension building （21m long × 16m width
× 10m height）in which BL18 (SENJU) and BL19
(TAKUMI) are stored is located at the west of the
MLF main building（140m long × 70m width × 35m
height）(Figure 1).
The west-side extension building sank about 14
cm by great east Japan earthquake on March 11,
2011. On the other hand, MLF main building did nothave significant subsidence because it have deep
foundation piles (up to about 20 m below ground).
Then, BL18 and BL19 over both buildings sufferedserious damage by the difference in level between
the buildings (Figure 2). The beamlines; neutron
guides, shields, etc. were greatly damaged with thelevel difference. This paper reports the damages
and the restoration process of the extension building and beamlines of BL18 and BL19.

Figure 1. MLF main building and extension buildings with the quantities of subsidence.

Figure 2. Inside floor and outside wall around MLF main and west-side extension buildings.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

19

Recovery of west-side extension building
MLF and the construction department of JAEA
decided to jack the west-side extension building up
to the original floor-level together with ground improvement works from the viewpoint of cost and reinstallation of BL18 and BL19. For jacking up andperforming ground improvement, it is necessary todrill a large number of deep holes into the floor andto inject grout into the foundation soil through theholes. For that, we disassembled shields and all devices; guides, diffractometers, detectors, and wiring
etc. of BL18 and BL19, and moved them to the outside of the extension building (Figure 3).
In that way, the jack up and the ground improvement of the extension building were carried out for
about two months from the beginning of August,Figure 3.	Floor of the west-side extension building after removal of shields and diffractometers of BL18 and BL19.

2011 to the middle of September. The method ofjacking the building up is as follows.
1)	Inside the building, drilling deep holes into theground through the floor and injecting low-viscosity grout gradually into the cavities of theground through the holes using high-pressure
jet grouting system (Figure 4). The grout isbased on cement, silicate, or other materials,
selected to suit particular ground conditions andimprovement objectives. The grout fills in voids
and cracks of the ground and permeates into soil
pores to produce a solidified soil-grout mass.
2)	From the outside, grouting the various types ofgrout into the ground at a deliberately controlledpressure and flow rate by same method as in 1)(Figure 4).
3)	Mounting many hydraulic jacks under the building basic, and jacking the building up gradually abuilding (Figure 5).
4)	The procedure of 1)-3) is repeated until the levelof the building reaches to the original level and isstabilized at the level.
The jacking and the ground-improvement weredifficult constructions because the ground around
MLF building is sandy, but all the recovery construction of the extension building was completed
on September 10, 2012. The floor level of the extension building was returned to the original level
which is consistent to that of the MLF main building(Figure 6). After that, re-installation construction of
BL18 and BL19 started in the extension building.

Figure 4.	Grouting (injection of low-viscosity grout) for ground improvementat outside and inside the extension building.

20

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Figure 5. Jacking the extension building up by many hydraulic jacks.

Figure 6. Restoration to the original position (upper) and to the original floor-level (bottom).

Recovery of BL18 (SENJU)SENJU is a new TOF single-crystal neutron diffractometer designed for use in materials physics
and chemistry research. Commissioning of SENJU
had been scheduled to begin in April 2011 but wasdelayed due to severe damage to the instrument
caused by the earthquake of 11 March 2011. Since
the surrounding neutron shields of the diffractometer were in the boundary region between the MLF
main building and the west-side extension building, many shields were destroyed partially and theshields were leaned very much (Figure 7).

The two-dimensional detectors in the shield remained intact fortunately (Figure 8). However, thedetectors were migrated after the work to preventthe collapse of the shields (Figure 8), since the inside of the shield was in very dangerous condition.
After that, all shields around diffractometer and thediffractometer were also removed to the outsidestorage area. Moreover, since the positions of the
upstream iron collimator, neutron guide cases,
supports and the upstream beamline shields were
shifted, they were reinstalled to the original correct
locations.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

21

Figure 7.	Outside view of neutron shields around the SENJU diffractometer (left) and the inside (right).
The shields were partially damaged and tilted. The locking bolts of the shields were broken.

Figure 8.	Two-dimensional detectors (left) and the reinforced inclined-shields (right) in the shield roomof SENJU diffractometer.

The SENJU instrument team spent one year
deconstructing the beamline, repairing damaged
components, and rebuilding the instrument. On
5 March, 2012, the reconstruction of SENJU wascompleted and the first neutron beam was delivered
to the sample position.
Recovery of BL19 (TAKUMI)
TKAUMI suffered significant damages by the Japan earthquake; the west-side extension building
sank about 14 cm. The beam line shields at the joint
part between the main building, and the expansion
building were tilted and the neutron-guide parts (total
about 4 m) including the supports inside the shields,
were broken (Figure 9). Although the bolts, used to
fix the detector-frames at alignment-position, werealso broken, the detectors were saved fortunately.

22

To recover TAKUMI, all parts, including the spectrometer shields, were removed (Figure 3), afterthat the sunken extension building was jacked up toa former floor-level, the broken parts were repaired
and/or repurchased, and all parts were reinstalled at
the original location as they were at the time of theconstruction. In light of lessons learned from theseearthquake damages, we devised to design of theshielding and the guide for releasing the stress; thebeam line shield, the neutron guide, and their supports were separated at the boundary between themain and the extension buildings (Figure 10). The
recovery of the main part of TAKUMI finished at theend of February 2012. TAKUMI started its re-commissioning on March 6th, 2012 and is now ready forvarious engineering experiments.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Figure 9.	Overview of the inclined shields (left) and the broken glass of the neutron guide mirror(upper-right) and the tilted bellows of the neutron beamline (lower-right).

Figure 10.	The lessons learned from the earthquake disaster. The separated beamline shields (left)
and the separated neutron guides and the supports (right) around the boundary region
between MLF main building and the extension building.

K. Suzuya1, K. Aizawa1, S. Harjo1, K. Oikawa1, and T. Ohhara2
1
Materials and Life Science Division, J-PARC Center; 2Research Center for Neutron Science and Technology, CROSS-Tokai

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

23

Recovery Works for BL08 SuperHRPD Beamline

The Great East Japan Earthquake
The Great East Japan Earthquake hit the eastarea of Japan at 14:46 JST of March 11, 2011. JPARC experienced it at level 6 of the seismic intensity scale. When the annex buildings were planned
to be constructed without concrete piles by thebuilding teams of JAEA and KEK, we were informedthat uneven settlement as large as 1 cm might oc-

cur at building boundaries with the MLF building
with deeply driven piles. However, what actually occurred was that the annex buildings were droppedby 10 - 15 cm compared to the MLF building, andheavy iron blocks of the beamline shielding dropped
which destroyed guide tubes. The BL08 annex
building moved to the north by 3 cm and to the eastby 5 cm (Fig. 1).

Figure 1. The displacement and subsidence of two KEK buildings.

The building had subsided by up to 8.8 cm near
the Expansion Joint. The sample position of SuperHRPD moved to the north by 1.25 cm, to theeast by 3.39 cm and subsided by 2.77 cm.
Restoration Work
After the restricted admissions due to the risk ofcollapse by aftershocks were relaxed, damage evaluation and temporary repairs were quickly carriedout. In BL08, the iron shielding blocks at the expansion joint were immediately removed with caution.
The instrument group agreed with the building teamto, 1) carry out underground investigation quickly,2) fill earthquake-origin void space with concrete if
discovered, 3) re-install the beamline without restor-

24

ing the subsidence and displacement of the BL08
building itself. The voids caused by the earthquake
were finally discovered on November 7 - 9 between
the MLF and BL09 buildings (Fig. 2), and were filledwith concrete on December 5 - 12.

Figure 2.	Underground surveying of BL08 and BL09. Asterisk (*) marks are digging points.

The MLF and the Great East Japan Earthquake ― From Calamity to RevivalAs described, since the beamline shielding
dropped at the building boundary, several pieces ofguide tubes were broken as shown in Fig. 3. Once
all pieces of guide tubes were removed and cleaned
up, many small scratches were found inside them.

Figure 3.	Part of the guide tubes was broken at the building
boundary.

In the MLF building, part of the BL08 guide tubes
were moved and/or rotated inside iron jackets. For
instruments with straight beamlines inside the MLF
building, re-alignment is not so difficult, but for BL08
with curved guides followed by straight guides at
the annex building, re-alignment is more problematic because the direction of the straight guides is
not known due to the displacement and subsidenceof the annex building. We repeatedly surveyed theland and the building, and measured the shifts andsubsidence of the beamline and the sample position (Sep. 12 - 16 and Nov. 21 - 26). We finally de-cided to leave it at the sample position and to alignthe guide tubes so as to bring the beamline to thesample position.
In the MLF building, since the beamline displacement was small, the guide tube support structure was simplified so that the guide tube re-installation and alignment could be performed easily. In
the BL08 beamline building, the guide tube support
mechanism was re-designed so that an adjustment
as large as 10 cm along the vertical and horizontal
directions was made possible. The iron shielding in
the BL08 beamline building was raised by several
centimeters instead of restoring the subsidence anddisplacement of the building itself. Furthermore,
we adopted structures which were damage-proof
against earthquakes, and/or structures in which
breakage concentrates on a specific part.
After installing three disk choppers in November,
we installed guide tubes in the MLF building on
Dec. 12 - 22, and those in the beamline building on
January 10 - February 3. The earthquake-proof glue
was pasted to the glass guide tube connection in
the beamline building on February 6 - 10, followedby drying (10 days) and a leak check. The shielding at the building boundary was re-designed andcarefully re-installed on February 27 and 28, 2012.
The beamline shielding in the MLF and the beamline buildings were installed on January 24 - 25 andMarch 5 - 21, respectively. All the temporary restoration was completed by the end of March 2012
and the operation was permitted on March 23 by
the J-PARC radiation protection supervisor. However, one of the power supplies of the linac klystrons
broken on March 22 was not repaired until April 8.

S. Torii1,2, M. Yonemura1,2, T. Muroya1,2, Y. Noda3, and T. Kamiyama1,2
1
Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK; 3Tohoku University

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

25

Recovery of ANNRI from Damages
Caused by the Great East Japan Earthquake

At the time of the Great East Japan Earthquake
on March 11, 2011, the Accurate Neutron-Nucleus
Reaction Measurement Instrument (ANNRI) installed in BL04 suffered serious damages.
As shown in Fig.1, the gamma-ray shields madeof heavy metals for the large Ge spectrometerleaned to the walls. One of the shields was stoppedby breaking an air-conditioner, and the other by asignal cable rack installed along the walls. At thesame time, several of the annular shaped BGO
scintillators fell onto the floor, and their PMTs weredamaged.

Furthermore, the 6LiH neutron shields set in frontof the cluster Ge detectors were also damaged by
the stress of the detectors, and small amounts of6
LiH powder were leaked. This made the recovery
procedure very complicated. However, the teammembers of BL04 immediately made a plan to recover from the situation. The inclined gamma-ray
shields were removed from the BL04 experimental
area on April 11, 2011 and reinstalled on March 4,2012 as shown in Fig. 2. The recovered ANNRI has
been used again in the user program since Feb.
2012.

Figure 1.	Inclined gamma-ray shields for the large Ge
spectrometer.

Figure 2.	Recovered gamma-ray shields for the large Ge
spectrometer.

A. Kimura1,2, K. Hirose1,2, T. Kin2,3, and H. Harada1,2

1
Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Nuclear Science and Engineering Directorate, Japan
Atomic Energy Agency; 3Present address, Kyushu University

26

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Recovery from Earthquake Damage and Progressin the High Resolution Chopper Spectrometer (HRC)The High Resolution Chopper Spectrometer(HRC) was installed at BL12 to study dynamics incondensed matters with high resolutions and highenergy neutrons, and we confirmed that the HRC
works well as designed. Due to the earthquake on
March 11, 2011, 9 pieces of 2.8m PSDs were damaged and some shieldings were slipped on the HRC.
We realigned the beamline, restored the shieldings, replaced the damaged PSDs with new ones,
and confirmed the operations of the choppers, thevacuum system, and the electronics. After these recovery works, neutron scattering experiments werestarted in January 2012, also the first general user
program was performed on the HRC.
On the HRC, 64 pieces of 2.8 m PSDs aremounted on each detector bank panel of 1.5×3 m2
with a vacuum flange, and at present two panelswith PSDs are held on the vacuum scattering chamber. Previously, to mount PSDs, it was necessary to
remove the shielding blocks above the panels first,
and then, remove the panels by using a crane at theexperimental hall. At present, we mounted a rail justabove each panel, and the panel can be removed
from the chamber along the rail by using a hand
chain hoist. By using this mechanism, we replaced

the damaged PSDs with new ones in a much easierprocedure without removing the shieldings.
During the recovery works, we also improved theperformance of the HRC. A supermirror guide tubeof 5.2 m in the down stream part of the primary flightpath was installed, a greater intensity gain was obtained by a factor of 3 at Ei = 100 meV and a factorof 5 at Ei = 50 meV, for instance, in comparison withthe previous set-up. A soller collimator system wasinstalled just upstream of the sample, and the background noise was dramatically reduced. Software
for an experimental control environment was developed to combine the measurements of neutron
counts with the control of devices such as temperature controllers, goniometers, choppers, vacuum
system, and so on. The regeneration process to release absorbed molecules in the cryopump, which
is used for evacuating the vacuum scattering chamber, was optimized and a frequency of the evacuation process without the regeneration process was
greatly improved. A cryomagnet to apply magnetic
field of up to 14 Tesla to the sample was designed,
manufactured and delivered. The commissioning
work of the cryomagnet has been started.

S. Itoh1,2, T. Yokoo1,2, D. Kawana1,2, S. Satoh1,2, T. J. Sato3, T. Masuda4, and H. Yoshizawa4
Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK; 3Institute of
Mutlidisciplinary Research for Advanced Materials, Tohoku University; 4The Institute for Solid State Physics, The University of Tokyo

1

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

27

Return of the Neutron Beam

Neutron source
The first target damaged by the earthquake
was replaced with a new target in November 2011.
Figure 1 shows the first target with elongated seal
bellows and the new target, which replaced it. The
new target vessel, equipped with a bubbler in it for
mitigating the pitting damage caused by pressure
waves in mercury, had been fabricated as a sparetarget. That was the first time to replace the target
vessel, i.e. the heavy and large radioactive component, by remote-handling system since the MLF
began the beam operation. The target replacement
was successfully completed in 7 days just the same
way as the handling test under the cold condition.
Unfortunately, the installation of the helium gas supply system, which supplies compressed helium gas
to the bubbler, was not completed in time for the
beam operation due to the trouble in the helium
compressor. The mercury circulation operation of
the target system started again in December 2011.
The pressure drop of mercury in the target vesselincreased due to the bubbler installation, but theflow test showed the operation property agreed wellwith the estimation.
The beam operation was resumed in late December 2011. The proton beams were transported
from the accelerator to the mercury target and theirbeam orbits and profiles were tuned without any serious problems. The beam emittances were measured and no significant changes were found.
On December 22, the first proton beam after
the earthquake was successfully delivered to themercury target in the MLF. On December 23, a neutron beam was introduced for the first time to the
NOBORU instrument (BL10) under a 1 Hz operation. A neutron beam profile was measured with animage plate (Fig. 2). The neutron flux intensity wasmeasured with the gold foil activation method. A
neutron TOF spectrum was measured with a He-3
monitor counter (Fig. 3). It was confirmed throughthese measurements that the earthquake did not affect significantly the neutron beam characteristics.

Figure 2.	The first neutron beam in the MLF after the earthquake on which the kanji character “復” (fuku),
meaning "recovery", emerged.

Figure 1.	The first target vessel with plastically elongated seal bellows and the new replacement target vessel, which was redesigned to be compact and reduce the radioactive wastage.

28

The MLF and the Great East Japan Earthquake ― From Calamity to Revivalishing the radiation safety inspections on January
17. The inspections of the new instruments (BL02,
BL09, BL17, BL18) were done on January 26 andFebruary 1, and the permissions for operation
were granted. Two instruments in the annex buildings, BL19 and BL08, were severely damaged andshould wait to resume their operation until March 1
and 23, respectively.
36 neutron proposals out of 142 approved proposals (103 general-use and 46 project-use) in
2012A were performed at overseas neutron facilities (SNS, LANSCE, ISIS, ILL and HANARO), and2 proposals were done at SPring-8. (See Table 1.)
In 2012B, 19 neutron proposals out of 37 approved
general-use proposals were carried out after resuming of the user program.

Figure 3.	Neutron flux spectra before and after the earthquake.

Resuming the user operation
Neutron beam was supplied to the existing (operated before the earthquake) neutron instruments(BL01, BL03, BL04, BL05, BL10, BL11, BL12, BL14,
BL15, BL16, BL20, BL21) from January 24 after fin-

References[1]	M. Futakawa, Proc. ICANS XX, Bariloche, Rio
Negro, Argentina (2012).

Table 1. Number of neutron proposals in 2011A transferred to other facilities.

approved SNS LANSCE ISIS ILL HANARO SPring-8
BL01

13

3

BL03

20

2

BL05

1

BL08

13

BL10

14

BL12

3

3

BL14

12

3

BL16

11

2

BL19

19

3

BL20

34

4

BL21

2

1

1
1

4

1

1
3

1

1

1
1

2

M. Futakawa1, and H. Seto1,2Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK

1

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

29

MUSE - Damage and Recovery from the Earthquake

Introduction
MUSE (MUon Science Establishment) suffered
severe damages from the earthquake on March 11,
2011, the so-called ‘Higashi-Nippon Dai-Shinsai’.
Fortunately the damaged apparatus, ducts, andshields had been fixed on schedule. We were able
to restart the user’s run in February 2012.
Damages and their recovery
In particular, the damages on the boundaries ofthe building structure were serious, since severe
settlements occurred there. The following sections
shows the major damages suffered at MUSE.
2-1) The helium ducts, control cables, power cables, compressed air piping for the superconducting
magnet and on-line refrigerator system were damaged for D-line, due to ground settlements, about
10 cm to 1.5 m outside the MLF building. Also a
buffer tank for the He gas was tilted by 2-3 degrees.
Because of the high-pressure gas regulations, we
had to replace all the helium ducts at the boundary. Therefore we fixed the affected ducts as well
as a support for the ducts and had a high pressure
gas inspection in September, 2011. Finally, we managed to establish a stable operation of the superconducting solenoid magnet with the use of the

Figure 1.	Damaged helium ducts for the on-line refrigerator
at the boundary of the MLF building.

30

on-line refrigerator in December, 2012, although we
had to overcome some difficulties with components
not working properly.
2-2) The M1 and M2 air circulation systems forthe proton beam tunnels in the vicinity of the muontarget were damaged. In particular, it was foundnecessary to remove and rebuild some water ducts
and control cables, since the wall where they havebeen fixed, located at an expansion joint between
MLF and the proton beam transport line from 3-GeV
RCS (3NBT), was about to collapse. Finally, the wall
and water ducts etc. in the vicinity of the expansion
joint were fixed by November, 2011, which enabled
us to run a stable operation of the air circulation systems.
2-3) The M2 tunnel consists of a target chamber,six quadrupole magnets, four steering magnets,
two sets of profile monitor assemblies, 29 sets ofpillow-seal assemblies, and seven sets of duct assemblies. When the electric supply was restored
after the earthquake, it turned out that the vacuum
pressure in the M2 line primary beam duct was
air-pressure. We suspected that something wrong
with the pillow-seals caused some leakage in thevacuum. Eventually, after conducting vacuum leakcheck for all the pillow-seals, we found out that the

Figure 2.	The damaged wall was about to fallen down at
the expansion joint between 3NBT and MLF, as
if water ducts for the M1 and M2 air circulation
systems, were supporting the wall.

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

pillow-seals themselves were OK, but the tightnessof a metal gate valve was not appropriate.
2-4) We have been adopting an edge-cooled
non-rotating graphite target, so called ‘fixed target’ because of its ease of handling during maintenance. In this target, graphite is indirectly cooledby the copper frame, which surrounds the graphite.
In order to reduce stress, a titanium buffer layer of
2 mm is placed between the graphite disk and thecopper frame.
In order to inspect the soundness of the graphitetarget, just in case if damage to it was caused by
the earthquake, the graphite target assembly wastransported to the hot cell. There we investigated
not only the dimensional change but also the heat
conductivity by the way of remote handling. Consequently, it turned out that the graphite target wassound and could be operated for at least anotheryear.
2-5) It was surprising that a lot of anchor bolts(M24) were split out from the concrete shielding
blocks due to slipping off caused by the strong
quake. Therefore several concrete shielding blocks
themselves were broken or cracked. All of the damaged blocks were temporarily repaired with concrete maker until November, 2011.

Muon Beam Commissioning
Consequently, we managed to resume the operations of the D-line after recovering from almost
all the damage by the end of December, 2011. It is
our great pleasure to report we could deliver again
surface and decay muons up to 60 MeV/c beam towards D1 and D2 during the commissioning beamtime held on Jan. 17th, 2012, with an intensity equal
to the one before 2011[1]. The regular users’ runs
were restarted from Feb. 2nd, 2012. Fig.3 shows apicture of MUSE members celebrating the muon
beam recovery on Jan. 17th, 2012

Figure 3.	MUSE members celebrating the muon beam recovery on Jan. 17th, 2012.

Y. Miyake1,2
1Muon Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

31

Recovery from the Earthquake– Building and Concrete Shield for MUSE –A tremor with an intensity of 6+ on the Japaneseseismic scale, which corresponds to Mi9.0 on the
Richter scale, befell J-PARC on the 11th of March,
2011. The seismograph in the Tokai nuclear reactor which is about 2 km north of MLF recorded ahorizontal acceleration of about 0.4 G. Although thedamage to the MLF building was not serious, manysmall cracks were formed in the wall, and the devices, designed to withstand only 0.25-G quake, weredamaged seriously.
The pictures shown in Fig. 1 were taken just after
the earth quake. The damaged devices were locatedmainly around the movable shields and around the

expansion joint between the buildings. The damage
to the expansion joint originated from the movement
and settlement of the building. The utility lines suchas power cables and cooling water pipes striding
over the expansion joint were damaged, and were
fixed or replaced. The cooling water had been kept in
the lines since the day of the earthquake. Before theearthquake, MLF was operated for about two weeks,
and the activated water remained in the magnet.
Due to the radicals in the water, it was not good forcooling the water pipes, thus quick refreshment of
the water was required. However, it took about halfa year to fix the problem. After the recovery of the

(a)

(b)

(c)

Figure 1.	(a) The concrete shields of H line in experimental hall #1 and (b) that of D line in experimental hall #2, and (c) broken
expansion joint between 3NBT and MLF.

32

The MLF and the Great East Japan Earthquake ― From Calamity to Revivalcooling water system, the insulation resistance ofthe magnets in M2 tunnel was found to be reducedby the order of kW. Although this level of insulation
resistance does not affect the magnet operation, we
will take measures to address the issue in the next
fiscal year.
The radiation shield blocks piled in the experimental hall were moved. Some of them were fixed
on the building wall and floor by the metallic plate,and low shields were just piled with safety bars
against overturning. The fixing plates and safety
bars were broken at the anchors. About a quarterof the anchors for the D-line shield blocks were
pulled out. The broken anchors were cast-in type,a.k.a. grip anchor. Their execution management isdifficult, and by out-looking, it is not easy to judge
that they have designed strength against 0.25-G
quake. Because it is known that the quake of 0.4
G was coming, we fixed the fixing plates for theshield blocks to with stand about 0.4-G quake. We
stopped using cast-in anchors, and replaced themwith anchors fixed be resin, which can be controlledmuch easier during construction.
By the beginning of Decemeber 2011, we completed the fixing work and the muon facility was
ready to operate. The recovery was quick because
the beam line magnets were not damaged. We
didn’t need to realign them.

N. Kawamura1,2, and Muon Sci. Sec., J-PARC
1
Muon Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

33

Recovery of Superconducting Solenoidfrom the Great East Japan Earthquake

A conventional superconducting muon channel,
which can extract surface (positive) muons and decay positive/negative muons up to 120 MeV/c, issuccessfully operating at the MLF experimental hall
II. The 6 m long superconducting solenoid magnet
consists of twelve units of 0.5 m coil. The magnet
coil is forced-indirectly cooled by supercritical helium gas (4.8K at 0.80 MPaG) supplied from theon-line helium refrigeration system. The maximum
magnetic field was designed to be up to 5T (currently 730A) at the operational temperature of 6 K. The

present magnetic field for normal operation for surface/decay muon extraction is 0.308 T (45A)/2.33 T(340A), respectively
For the long-term stable operation, the on-line
helium refrigeration system is employed. The cooling power of the on-line helium refrigeration system
is 35 W at 4.5K and 200W at 80K, and it can also
produce 8 l/h of liquid helium. The whole system ismonitored and controlled by a VME controller combined with a personal computer with dedicated software based on the LabVIEW System, and it cools

Figure 1.	Photograph of the broken He piping for the refrigerator, located just outside of MLF building before(above) and after the repair (below)

34

The MLF and the Great East Japan Earthquake ― From Calamity to Revivaldown automatically. The typical cooling period fromroom temperature to operation temperature (~5 K)
is about 3 days. The long-term (typically 1 month)
operation is now established under quite stableconditions.
To avoid any serious damage to the superconducting solenoid and the helium refrigeration system,
a VME based interlock system has been installed.
The system can detect any anomaly in the voltage
and the temperature of the solenoid and the power
lead; the trip signals from the helium refrigeration system and the electric power supply are also included.
Once any emergency status is detected, the electric
power supply immediately stops the current supply
and the refrigeration system changes to self-operation mode. In addition to these interlock systems,
this part can also record automatically the temperatures and pressures of the superconducting coils, thehelium refrigeration system and the power leads. All
recorded data are also monitored and stored at theMLF control room, by using MELSEC-NET.

In FY 2010, the solenoid and on-line refrigeration system was operated smoothly for more than
5000 hrs, up to the gigantic earthquake on March
11th 2011. At that time, the system was operating,however, it stopped safely and there was no He gas
release. The damage due to the ground sinkage wasrather serious, especially the He piping from the outside compressor building was warped as shown in
Fig.1. Therefore, we replaced three He pipes – thehigh pressure, the low pressure from the compressor and the buffer pass. At this time a 1m long flexible pipe was adopted instead of the 0.5m pipe to
avoid damage from the gradual sinking.
The other components like solenoid, cold box
and transfer tubes were fortunately not damaged.
And also the whole cabling and interlock system
was checked to be O.K. under room and also operational temperature conditions. We checked theleakage and pressure resistance for all components. The recovery was completed by the end of
November 2011.

K. Shimomura1,2, Y. Nemoto1,2, A. Koda1,2, K. Nishiyama1,2, and Y. Miyake1,2Muon Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK

1

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

35

Measurement for Deformation of Muon Target by the Great East Japan Earthquake
and Measurement for Thermal Diffusivity of Proton Irradiated Graphite

Because J-PARC was heavily affected by theGreat East Japan Earthquake, serious deformationof the muon target rod could be predicted. Therefore
the precise position of the muon target rod was measured in a remote handling room, Hot cell in Augustand September of 2011. Simultaneously, the 3-GeV
proton irradiation effect on the thermal diffusivity ofgraphite was measured for the used target, because
it is known that when the crystal structure of thegraphite material is broken, the thermal diffusivity
decreases by proton beam irradiation [1].
A muon target is integrated into a target rod. Thenthe target rod is attached to a plug shield through 4
screws. This assembled component is called muontarget assembly. When the muon target assembly
had been installed in the proton beam line, the muontarget could be positioned with 0.5-mm precision
against the beam line. The position is determinedthrough three pairs of guide pins, male pins inside
the chamber on the beam line and female pins on
a plug shield. Consequently, the deformation of thetarget rod can be measured when the position of themuon target is measured against the female pins on
the plug shield. Then a plug stand was positioned in
Hot cell; three male pins with the same dimensions

as the ones inside the chamber were equipped on
the plug stand. Two laser displacement meters were
set on a 3-dimensional motion stage, which was attached to the plug stand. Figure 1 shows the measuring devices attached to the plug stand. The positions of the used target and the un-irradiated target(spare target) were compared with the position ofa mock target with the dimensions of the original
design. Figure 2 demonstrates the results of themeasurement. The differences of the positions on
the used target and the un-irradiated target from themock target were less than 0.5mm. The conclusion
was that the deformation of the muon target rods
was small enough, so they could be used again.
Simultaneously, a modified Thermal Imaging
Scope, TSI (Bethel Co. Ltd. [2]) was set on a motion stage to measure the thermal diffusivity of thegraphite. In this method, the material is heated bya periodic heating laser diode. The propagation of athermal wave around the heated spot is measured
with a two-dimensional infrared thermometer. The
thermal diffusivity can be locally evaluated throughthe delay of propagation or the amplitude gradient,which depends on the distance between the laserheated spots. The proton beam profile had complied

Figure 1. The picture of the measuring devices attached to the plug stand.

36

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Figure 3. The integrated intensity of 3-GeV proton beam

Figure 2.	The result of the measurement for the positions of
the used target and the spare target against theposition of the mock target.

with a Gaussian distribution. The standard deviationof the distribution was approximately 4 mm on thehorizontal direction and 3 mm on the vertical direction. Figure 3 demonstrates the integrated intensityof the 3-GeV proton beam. The integrated irradiationdose by the protons was evaluated through a MonteCarlo simulation code, PHITS. The distribution of thedose followed the beam profile and complied with aGaussian distribution as well. The maximum dose
was 0.25 dpa at the center of the beam spot. The
target temperature during the proton irradiation canbe evaluated from thermal conductivities, which had
been obtained in neutron irradiation, and it is supposed to be 470 K. The thermal diffusivities along a
vertical line and a horizontal line going through thecenter of the muon target were measured every 1
mm. Furthermore, the thermal diffusivities on an areaof 20 mm horizontally by 16 mm vertically were measured every 2 mm. Figure 4 demonstrates the thermal diffusivities along a vertical line and a horizontal
line going through the center of the muon target. If
decrement of the thermal diffusivity was proportional
to the irradiation-dose, the decrement would also
comply with a Gaussian distribution. However thethermal diffusivity on the center was higher than the
one in the vicinity of the center. It can be considered
as an annealing effect that smaller decrement of

Figure 4.	The thermal diffusivities along a vertical line anda horizontal line going through the center of themuon target.

Figure 5.	The distribution of the thermal diffusivities on thearea of 20 mm horizontally by 16 mm vertically.

thermal diffusivity will occur under protons-irradiation
at higher temperature. Figure 5 demonstrates the
distribution of the thermal diffusivities on the area of
20 mm horizontally by 16 mm vertically. From theseresults, an ellipse-shaped distribution, which is similar to the beam profile, could be observed.
References[1] H. Matsuo, graphite1991 [No.150] 290-302.
[2] http://www.bethel.co.jp/eng/index.html

S. Makimura1,2, N. Kawamura1,2, K.M. Kojima1,2, A. Koda1,2, A. Kurosawa3, R. Shimizu3, P. Strasser1,2, J. Nakamura1,2,
and Y. Miyake1,2
1Muon Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK; 3Nippon Advanced
Technology Co. Ltd. (NAT)The MLF and the Great East Japan Earthquake ― From Calamity to Revival

37

Materials and Life Science Experimental Facility
Summary of 11 March 2011 Earthquake Damage and Recovery Action
DamageRecovery Action

Infrastructure and Utilities
Electricity• Total power loss to site
• Displacement of high-voltage transformers (5units)• UPS and backup generators functioned as
designed providing emergency power• Site power restored on 14 March• Low-voltage power to beamlines restored by theend of March• Transformers replaced/repaired and repositioned…

Water supply and drainage• Site water supply cut• Extensive damage to supply and drainage pipes
caused by displacement and subsidence• Re-circulated cooling water knocked out –damage to heat exchange units• Full water supply in the Tokai area resumed on
24 March• Re-circulated water restored for limited hours by
end of May

Telecommunications• Landline telephone system cut (On site andexternal mobile services working)• Web/email servers down

• Landline telephone system restored• KEK email server restored on 14 March.
• JAEA email server restored on 22 March and
JLAN on 23 March

Buildings and associatedstructures• MLF building largely undamaged• Ground around the MLF building had subsided
by ~1.5 m in places• Hendel Building sustained moderate damage
to windows and shutters. The 2nd Floor corridor
was impassable due to fallen debris• Large void space discovered under the floor of
the MLF building in Nov 2011

• Remedial work on Hendel Building carried out
immediately – full repairs ongoing• Under-floor voids of MLF building partially filledwith concrete in Dec 2011 – some still remain
and ground continues to settle

Roads and pathways• Vehicle access to the MLF impossible due tosubsidence of access roadway• Site-wide cracking, buckling and subsidence ofroads and pathways• Access routes required for recovery work
repaired as top priority• Non-essential repair work will be carried out inthe future

Neutron target andmoderators• Target assembly displaced by 30 cm• Bellows attached to target vessel extended anddestroyed• Air and water supply lines bent and broken• Components of the cryogenic hydrogen systemoutside the building shifted and damaged• Hydrogen supply lines damaged at the entry
point to the MLF building• Ventilation and air conditioning systems checkedfor damage and restarted during April 2011
• Broken air supply lines cut out for a temporary fix
and normal operation restored in mid-May 2011.
• Water lines re-connected to allow operation andfull restoration completed in August• Target assembly removed and replaced

3NBT• Entire tunnel displaced as foundation earthworks • Electromagnets and supporting structures
undamaged but complete re-alignment and resubsided by 20 cm
conditioning required• Sections of tunnel internal wall collapsed• Vacuum and cooling water systems repaired and• Crane in tunnel severely damaged
replaced as needed• Electromagnets and supporting structures
undamaged but complete re-alignment required • Full checks of all components carried out• Vacuum and cooling water plumbing damaged/
destroyed in some sections

Shutters• 9 beamlines suffered loss of shutter vacuum (01, • Shutters and vacuum restored by the end of
03, 04, 05, 11, 14, 15, 16 & 19)
Sept 2012

Muon target• No observable damage to edge-cooled graphite(fixed) target

Facilities and Instruments

38

The MLF and the Great East Japan Earthquake ― From Calamity to Revival• Target assembly removed to hot cell to bechecked for changes in structural integrity and/or
thermal conductivity• Found to be in operating condition and reinstalledDamage

Recovery Action

Superconducting solenoid• He leakage from the entire system – internal He
pressure found to be 1 atm• Suspected internal damage• Shielding removed and the solenoid
disassembled for inspection• Some bolts found to be loose but the integrity ofsystem confirmed• Re-assembled and re-installed

Refrigeration system• Ground subsidence by 10 cm – 1.5 m outside
MLF building caused damage to helium ducts,
control and power cables and compressed airlines for superconducting magnet and on-line
refrigerator system on the D-line• He buffer tank tilted 2-3 degrees• All He ducts at the building boundary replaced
and other damaged components repaired• Inspection of system in Sept 2011
• Stable operation of superconducting solenoid
magnet achieved in Dec 2011

West Extension Building• Entire structure displaced 4 cm to the north• Floor subsided by 14 cm at the expansion joint
with the main MLF building• 1/500 slope from east to west

• All shielding and beamline/instrumentcomponents removed• The entire building jacked up to the original leveland under-filled with supporting concrete over a
3-month period. Completed in August 2011.

Long (BL08) Building• Entire structure moved to the north by 3 cm andthe east by 5 cm
• Floor subsided by 9 cm at expansion joint with
MLF main building and 2.8 cm at 90 m point• Decided not to re-position building but re-install
beamline in new location• Under-floor voids created by earthquake filledwith concrete

Shielding• Over 2400 tonnes of shielding in more than 500 • Almost all shielding blocks re-positioned• Brackets installed to improve stability in theblocks displaced and in some cases damaged
event of another quake• Some overhead shielding on beamlines partially• Work completed in 3 months working in double
collapsed
shifts• Many shielding blocks tilted over
• Positions of some choppers, guides andinstruments shifted by the movement of shielding

BL01 4SEASONS• Beam center was shifted by about 6 mm from the • Confirmed that the shift in beam center would
not severely affect most measurements
design position - probably due to misalignment• Re-alignment of guide tube will require majorof the guide tube
effort ⇒ postponed until next long shutdown• Crack in a concrete shielding block (Block size =• Replaced the damaged block with a new one in
1530 mm x 842 mm x 365 mm)
Nov 2011

BL02 DNA• Concrete shielding blocks damaged• Guide tube repaired with touch-up paint• Surface of super mirror glass for neutron guidetube chipped after the assembly was dropped byworkers when the earthquake struck

BL03 iBIX• Some shifting of equipment and 19-inch rack
toppled over
• No major damage

BL04 ANNRI• Lead shields around the spectrometers collapsed • Lead and LiH shielding repaired and re• LiH neutron shields damaged
positioned• Coaxial Ge and BGO detectors – part of the• BGO detectors repaired
spectrometer – were damaged• Coaxial Ge detectors will be repaired by the endof March 2013

BL05 NOP• Supermirror guide inside shutter duct cracked• Control cables for beamline collimators crushed• Super mirror guide replaced• Cables replaced

BL08 S-HRPD• Guide tubes destroyed by collapsed shielding• Sample position subsided by 2.8 cm and shiftedlaterally by 1.25 cm (north) and 3.39 cm (east)• Guide tubes in MLF building re-position and/or
rotated• Repeated surveying required to determine
recovery strategy (Sept and Nov 2011)• Determined to re-align beamline to the “new”
sample position• Guide tube supports re-designed with greater
adjustment range and re-installed• Disk choppers re-installed in Nov 2011 and guidetubes in Dec 2011 - Feb 2012
• Building boundary shielding re-designed and reinstalled late Feb 2012
• Beamline shielding re-installed Mar 2012
• Temporary restoration completed and operationscommenced end of Mar 2012• 25 m guide tube alignment checked and neutron
flux simulations performed
No significant change to flux

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

39Damage40

Recovery Action

BL10 NOBORU• Shielding blocks displaced by several mm• Beamline components on the shielding blocks
were similarly displaced (downstream slits, filter
exchanger, rotary collimator and vacuum duct)• Beamline components re-aligned• Re-alignment completed at the end of March2012

BL12 HRC• 3He detector bank damaged – 9 tubes lost
• Shielding blocks displaced by several cm• Fermi chopper toppled over

• Tubes replaced and detector restored in
December 2011
• Shielding blocks and beamline components realigned in July 2011

BL14 AMATERAS• 20+ concrete shielding blocks damaged• Sample mount flange damaged after falling• Concrete shielding repaired with mortar• Damaged flange repaired by internal engineering
staff

BL15 TAIKAN• Damage to shielding interlock due to ~50 cm
displacement of movable shield• Damaged interlock replaced• Stopper installed to secure movable shield to themain shield when closed

BL16 SOFIA• A hatch made of concrete blocks was displacedcausing the breakage of an interlock key.
• Equipment for controlling sample environment(Langmuir trough) damaged.

• The hatch was re-positioned and fixed in place
by a stopper• The damaged equipment was replaced with
newly-purchased items

BL17 SHARAKU• Displacement of beamline components• Several Shielding blocks damaged• All beamline components dismantled andrealigned• Damaged shielding blocks
re-fabricated and re-installed

BL18 SENJU• Displacement of the entire instrument• Shielding blocks on the boundary between the
2nd and 3rd Experimental Halls tilted and someseverely damaged• Due to horizontal shift of the 3rd Experimental
Hall fiducial marks unusable• All beamline components dismantled andremoved• Damaged shielding blocks werere-fabricated• All beamline components in the 3rd Hall
reconstructed• New fiducial points in the 3rd Hall surveyed andmarked out• Supermirror neutron guides removed and realigned• Instrument reconstructed

BL19 TAKUMI• Shielding at the boundary between the MLF andsatellite buildings tilted over due to subsidence• 4 m sections of guide including the support
structures inside the shielding destroyed• Bolts holding detector frames snapped and theframes hit the sample table• Shielding, guides and spectrometer dismantled
and removed.
• Building jacked up and reset• Damaged components repaired or replaced andre-installed• Beamline and instrument largely restored by end
Feb 2012• Re-commissioning began 6 Mar 2012

BL20 iMATERIA• Front-end shielding collapsed• Guide tube removed to create work space• Beam dump and vacuum exhaust equipment• Shielding re-positioned with added reinforcementtilted over due to subsidence of the 3rd Expt. Hall • Guide tube re-installed and re-aligned• Beam dump and vacuum exhaust components
removed and re-installed after building
restoration completed

BL21 NOVA• Almost undamaged• Shielding blocks re-positioned• Displacement of shielding blocks• Interlock pin replaced and a fixing pin attached• Interlock pin of the shielding ceiling hatch broken
to prevent movement in any future tremors

The MLF and the Great East Japan Earthquake ― From Calamity to Revival

Science Highlights

Pulsed Neutrons Light up the Hydrogen-Bond Networkand the pH Sensitivity in Human Transthyretin

Introduction
Transthyretin (TTR) is a tetrameric human plasma protein (molecular mass 55 kDa) composedof identical 127-residue subunits, each having aβ-sheet structure. TTR plays a major role in thetransport of thyroxine and retinol, the latter via the
TTR-retinol binding protein complex. TTR composes the amyloid fibrils found in patients afflicted witheither familial amyloidotic polyneuropathy (FAP) or
senile systemic amyloidosis (SSA).
The presented evidence indicates that it relies
on dissociation of the tetramer, which is facilitatedunder mild denaturing conditions, followed by misfolding and misassembly of dissociated forms togenerate amyloid fibrils. Remarkably, it has beenfound that in vitro an acidic medium promotes TTR
fibrillogenesis, and that the extent of amyloid fibril
formation is enhanced for amyloidogenic mutant
TTR. In order to investigate the structural explanation for the pH-dependent effects and structural stability of TTR, time-of-flight neutron protein crystallography was performed using BL 03 (iBIX). In thisarticle, the hydrogen-bond network and pH sensitivity of human transthyretin related to the amyloidosis
are described [1].
Neutron diffraction experiments at BL 03 (iBIX).
The large deuterated crystals were prepared bysitting drop vapor-diffusion method at pD 7.4 (Fig.
1a). Neutron diffraction data were collected at BL
03 (iBIX). To complete the data, 41 data sets werecollected using wavelength ranging from 2.7 to 6.7
Å. The exposure times were 22 hours for each set
at 120 kW J-PARC accelerator and 12 hours at 220
kW. The neutron crystal structure of TTR were determined at 2.0 Å resolution with an Rfactor of 23.4%.
The protonation states and the direction of the water molecules were determined by difference Fourier density at the position of deuterium atoms inwhich the target residue was omitted (Fig. 2).
Hydrogen-bond network and pH sensitivity
The neutron crystal structure at pD 7.4 revealed
the detailed hydrogen-bond network depending on
the protonation states of H88 (Fig. 2). This hydrogenbond network is composed of T75, W79, H88, S112,
P113, T118-B and four water molecules. The W79,
H88, S112 and P113 residues were located at the dimer-dimer interface (subunit A and D), while the H88
and T118-B were located at the monomer-monomer
interface (subunit A and B). At neutral pD (pD 7.4),
neutron scattering length density map clearly showedthat H88 was single protonated. These results suggest that the full protonation of H88 by the acidic pH
probably breaks this hydrogen-bond network and destabilizes both the tetramer and the dimer.

Figure 1.	(a) TTR crystal grown up to 2.5 mm3. (b) TOF neutron diffraction image showing
from 3.16 to 5.03 Å resolution range.

42

Science Highlights

Figure 2.	The |Fo|-|Fc| difference neutron scattering length density map calculated omitting
H88 and water molecules. The dashed yellow lines indicate the hydrogen bonds.

Furthermore, the structural comparison with Xray crystal structure at pH 4.0 (PDB code 3D7P)
revealed that the hydrogen-bond network involving
H88 disappeared at pH 4.0. The structural destabilization caused by the lowered pH can be accounted
for by the full protonation of H88. This is the firstcrucial piece of information on the way to elucidate
the atomic details of amyloid fibril formation.
Conclusion
In conclusion, the neutron structure of TTR provides the first picture of the hydrogen-bond networks and protonation states in human TTR. Our
structural analysis reveals a wealth of information
about the hydrogen bonds at the subunit-subunit in-

terface and the pH sensitivity in TTR. This information can be utilized to study the molecular stabilities
and pH sensitivities in amyloidogenic TTR variants.
The neutron crystal structure including hydrogenatoms could be useful for in-silico drug screening
in terms of calculation of the accurate binding freeenergy. In addition, the present study demonstrates
that neutron protein crystallography is a powerful
method for studying hydrogen bonds and pH sensitivities in proteins.
References[1]	T. Yokoyama et al., J. Struct. Biol. 177 (2012)
283.

T. Yokoyama1, M. Mizuguchi1, Y. Nabeshima1, K. Kusaka2, I. Tanaka2, and N. Niimura2
1
Facluty of Pharmaceutical Sciences, University of Toyama; 2Frontier Research Center for Applied Atomic Sciences, Ibaraki University

Science Highlights

43

Spin wave Measurements over the Full Brillouin Zoneof Multiferroic BiFeO3

Multiferroic materials, where the magnetic orderand ferroelectric polarization coexist, are one of themost sought-after topics in the condensed matterphysics [1]. The current intense interest on suchmaterials is driven not only by the intellectual desire
but also by its immense potential for future applications.
BiFeO3 is arguably one of the most interesting multiferroic compounds with both ferroelectricand magnetic transitions above room temperature:with an antiferromagnetic transition temperature at
TN=650 K and a ferroelectric transition temperature
at TC=1100 K [2,3], exhibiting very large polarization
value, ~100 μC/m2 [4]. In addition, an incommensurate structure is formed with an extremely long
period of 620 Å when it undergoes an antiferromagnetic ordering at 650 K [3], Despite the numerous
reports of the unusual phenomena found in BiFeO3,
the underlying microscopic spin Hamiltonian is notwell established yet.

Figure 1.	(a) Theoretical spin waves calculated with three different Hamiltonians. (b) Experimental spin waves measured at
AMATERAS of J-PARC (circles) and MERLIN of ISIS (contour plot) together with the theoretical spin waves (solid line)
calculated with J=4.38 and J’=0.15 meV.

44

Science Highlights

We have grown several high quality single crystals and aligned ten crystals with a total mass of 1.9
g. Using these samples, we have carried out inelastic neutron scattering experiments with two time-offlight spectrometers: one is AMATERAS at the JPARC, Japan and another MERLIN at the ISIS, UK.
We started with a minimal Heisenberg Hamiltonian only with the nearest neighbor (NN) interaction,and then extended it to explain the measured dispersion curve by including the next nearest neighbor (NNN) interaction and a Dzyaloshinskii-Moriyalike term as the following model Hamiltonian:
H = J ∑ S i ⋅ S j + J ′∑ S i ⋅ S j − D ⋅ ∑ S i × S i + δ ,
NN

NNN

i

for the magnetic unit cell of the G-type structure. The third term describes a DzyaloshinskiiMoriya-like interaction with i+δ representing
the next nearest neighbor of site i along the [11 0] direction: D is parallel to the chiral vector [1-1 0]. By carefully examining the data, we succeeded, for the first time, in measuring the full
spin waves of BiFeO3 and determined the twomost important exchange parameters, which
are the nearest and next nearest neighbor interactions: J=4.38 and J’=0.15 meV, respectively[5]. Surprisingly enough, a simple spin Hamiltonian with these two exchange interactions
explains the measured spin waves. We further
estimated an effective Dzyaloshinskii-Moriya
interaction: D=0.107 meV for the incommensurate magnetic structure. Our results provide themicroscopic parameters for the spin waves of
BiFeO3, the key to a deeper understanding of
the physical properties.
References[1]	S.-W. Cheong and M. Mostovoy, Nature Mater.
6 (2007) 13.
[2]	J. R. Teague et al., Solid State Commun. 8(1970) 1073.
[3]	I. Sosnowska et al., J. Phys. C 15 (1982) 4835.
[4]	J. Wang et al., Science 299 (2003) 1719.
[5]	J. Jeong et al., Phys. Rev. Lett. 108 (2012)
077202.

J. Jeong1, E.A. Goremychkin2, T. Guidi2, K. Nakajima3, G.S. Jeon4, S. Kim5, S. Furukawa6, Y.B. Kim6, S. Lee7,
V. Kiryukhin8, S-W. Cheong8, and Je-Geun Park1,9
1
FPRD Department of Physics & Astronomy, Center for Strongly Correlated Materials Research, Seoul National University; 2ISIS Facility,
STFC Rutherford Appleton Laboratory; 3Neutron Science Section, Materials and Life Science Division, J-PARC Center; 4Department of
Physics, Ewha Womans University; 5Neutron Science Division, Korea Atomic Energy Research Institute; 6Department of Physics, Universityof Toronto; 7Neutron Science Division, Korea Atomic Energy Research Institute; 8Rutgers Center for Emergent Materials and Department of
Physics and Astronomy, Rutgers University; 9Center for Korean J-PARC Users, Seoul National University

Science Highlights

45

Characterization of Swollen Brush Structure in a Solvent by
SOFIA Reflectometer

Results
Figure 2(a) shows the NR curves of the PMTAC brush interfaces in air and D2O, and (b) the
corresponding neutron scattering length density(SLD) profiles along with the distance from the Si
substrate surface. Although the SLD of PMTAC
was relatively low as 0.75 × 10-4 nm-2 due to nondeuterated polymer, the thickness of the brush film
under atmosphere conditions (50% relative humidity at 298 K) was determined to be 29.0 nm from theperiodic fringes.
On the other hand, NR of PMTAC brush in D2O
showed indistinguishable fringes, however, thespecular reflection was measured down to 10−6 in reflectivity and up to 2.0 nm−1 in q using white neutrons
with a wavelength range of 0.20 – 0.88 nm. The SLD
profile of the PMTAC brush in D2O was a smooth upward curve from 4.1 × 10-4 nm-2 at Si substrate surface to 6.38 × 10-4 nm-2 along with the distance fromthe substrate. SLD curve of the brush approachedSLDD2O at ca. 50 nm from the surface. The gradientprofile indicated that the polymer chains in D2O werestretched up to ca. 50 nm and relatively extended in
the direction normal for the substrate.
However, the NR profile showed the specularreflection at q = 0.8 - 2.0 nm-1, which indicated thepresence of dense layer with 2-nm thick on Si substrate surface. PMTAC chains near the Si surface
might be confined strongly to form the dense layer[6]. We assumed that the PMTAC brush adopted
a two-region structure consisting with some thinand dense surface region and a brush region that

Introduction
Polymer brushes are surface- tethered polymers
on a solid surface with sufficiently high grafting density, which are applicable in colloid stabilization, wettability, antifouling, adhesion, and tribology. In particular, the polyelectrolyte brushes participate in thewater lubrication of biological surfaces like articularcartilages of mammalian joints. Therefore, it is an
essential study to characterize the thickness of swollen or collapsed brush structure and the segment
density profile at solid/ liquid interfaces [1]. Neutronreflectivity (NR) measurement is quite useful for insitu determination of static structures at the solid/ liquid interface in the nanometer length scales.
SOFt Interface Analyzer (SOFIA) reflectometerin MLF is a horizontal type neutron reflectometer
constructed by the collaboration of JST ERATO
Takahara Soft Interfaces Project and KEK-IMSS[2,3]. We conducted NR measurement at D2O/ polyelectrolyte brush interface by SOFIA to obtain thedepth-profile of swollen brush structure [4].
Experiments
A hydrophilic poly[{2-(methacryloyl- oxy)ethyl}trimethylammonium chloride] (PMTAC) brush [5] wasprepared by surface-initiated atom transfer radical
polymerization from alkyl bromide-grafted silicondisk with 3-inch diameter and 10-mm thickness. The
number of the average molecular weight of PMTAC
was 110,000 g/mol. The incident neutrons were irradiated through the Si disk and reflected at the D2O/
Si substrate interface as shown in Figure 1.

Si substrate

NR
D2O

CH3
CH3
CH2 C
n
Cl
CO2(CH2)2 NCH3CH3

PMTAC brush

Figure 1. Schematic view of NR measurement of D2O/ brush interface and chemical structure of PMTAC brush.

46

Science Highlights

Refl

10-6

(a)

100
10-2

Reflectivity(b)1‫ ۑ‬PMTAC brush/ Air2‫ ڹ‬PMTAC brush/ D 2O
1

10-4
10-6
10-8

2

q =(4π/λ)sinθ

0.1

0.2 0.3 0.4

q, nm -1

1

2

Distance from Si substrate, nm

10-8

2

q =(4π/λ)sinθ

0.1

1

0.2 0.3 0.4

q, nm -1

1: PMTAC brush/ Air
2: PMTAC brush/ D2O

60
40

2

D2O

40

Air

20

1

2

Swollen
brush

5
0
0

1

60

2

3

4

20

Confined brush layer
SiO2
Si
5
6
7

Neutron SLD × 10-4 nm-1

Distance from Si substrate, nm(b) 2.	(a) NR curves of PMTAC brush interfaces in air (open circles) and D2O (open triangles), and (b) the corresponding
Figure2O
1: PMTAC
brush/
Airwith the D
60
60 the silicon surface.
neutron
SLD profiles
along
distance from40

2: PMTAC brush/ D2O
Air

40

20
References
stretches20
away fromthe substrate.
1
2
Swollen[1] M. Kobayashi et al., Soft Matter 3 (2007) 740.
Owing to the high flux and low background
noise
brush
5
[2]	K. Mitamura et al., J. Phys. Conf. Ser. 272
even at high q range of the SOFIA reflectometer,(2011) 012017.
a migrated thin layer with nano-meter
thicknessat layer
Confinedbrush
SiO2[3]	N. L. Yamada et al., Euro. Phys. J. Plus 126
solid/liquid0 interface was clearly observed.
These
Si(2011) 108.
findings will contribute to the understanding of
0
1
2
3
4
5
6
7
-4
-1
[4] K. Mitamura et al., Polym. J. in-press.
unique behaviors,such SLD
as adhesion
and frictions,
Neutron× 10 nm[5]	M. Kobayashi et al., Macromolecules 43 (2010)of polyelectrolyte brushes in aqueous solution with
8409.
various ionic strengths.
[6] I. E. Dunlop et al., Langmuir 28 (2012) 3187.

M. Kobayashi1, H. Arita2, N.L. Yamada3,4, H. Jinnai1,5,6, and A. Takahara1,2,5,6
JST ERATO Takahara Soft Interfaces Project; 2Graduate School of Engineering, Kyushu University; 3Neutron Science Section, Materials andLife Science Division, J-PARC Center; 4Institute of Materials Structure Science, KEK; 5Institute for Materials Chemistry and Engineering,
Kyushu University; 6WPI-I2CNER, Kyushu University
1

Science Highlights

47

Neutron Diffraction in 40 T Pulsed High Magnetic Fields
at MLF J-PARC

Introduction
In high magnetic fields, various exotic states
are induced. Magnetic order parameters and key
characteristics of such phases can be examined
precisely by neutron diffraction. A magnetic field of
20 T is the maximum of superconducting magnet
for neutron diffraction and thus pulsed magnets areneeded to access the field above this limit. Here,
we report the achievement of the world’s highest
pulsed magnetic field for neutron diffraction and its
application to a multi-ferroic compound.
Capacitor Bank and Magnet
Pulsed magnetic fields are generated by the capacitor bank method. The system consists of a 50
T pulsed magnet, a 250 kJ capacitor bank and acryostat. Figure 1 shows the capacitor bank set atthe BL10-Noboru spectrometer. The volume of thebank is about 11 m3. The energy stored in the capacitor is discharged into the coil synchronizing with
the neutron pulses.

Figure 1. 250 kJ Capacitor bank set at MLF.

The solenoid magnet designed in collaboration
with Kindo group at ISSP is shown in Fig. 2. Highstrength Ag-Cu alloy wire is used as a conductor.
The outer side is supported by a ring made of Maraging steel. The magnet is set in horizontal direction

48

Science Highlights

and is cooled by liquid nitrogen. A temperature as
low as 1.6 K is possible to reach by using a speciallydesigned cryostat. The open aperture of the magnet
in cryostat is 24 degrees.

Figure 2. 50 T solenoid coil.

Figure 3 shows the waveform of the generated
pulsed field. A pulse width is about 5 msec in symmetric mode and is about 10 msec in damping modewith a crowbar circuit.

Figure 3. Waveform of a pulsed field.

Example of Laue Method Diffraction
In case of a pulsed white neutron source, the Lauemethod can be used to scan a wide range in reciprocal space [1]. As shown in Fig. 4, the time dependenceof the diffraction pattern is measured by using a whiteneutron beam. Note that the wavelength and the magnetic field intensity are related to each other by thetime of flight (TOF). Hence, each pattern is taken atcertain magnetic field intensity. In the pulsed magnetic
field, the magnetic field dependence of the Laue pattern is measured as the time dependent “Laue movie”.

Figure 5.	Two dimensional plot of data taken for multi-ferric
TbMnO3. The white and red are the data at zero
field and at 40 T magnetic field maximum.

Figure 4.	Schematic view of the Laue method. X and yshow the axis of an area detector.

Figure 5 shows the two-dimensional pattern spanning with TOF and the vertical scattering angle. These
data are captured by a single position sensitive detector set along the vertical direction with a fixed horizontal scattering angle. Several Bragg peaks are measured simultaneously in the time-dependent magnetic
field. Note that the field is time dependent along the
TOF axis and constant along the scattering angle.

It has been discovered that some of the peaks
disappear in high magnetic fields and some show
shifts in positions. Such multi-peak scan is the advantage of using a pulse neutron source. The present result shows that a neutron diffraction experiment becomes possible for real samples at 40 T because of the strong instantaneous intensity of the
J-PARC neutron beam.
References[1] Nojiri et al. Phys. Rev. Lett. 106 (2011) 237202.

H. Nojiri1, Y. Narumi1, S. Yoshii1, T. Morioka1, M. Baker1, M. Harada2, K. Oikawa2, F. Maekawa2, and K. Nakajima3
1
Institute of Materials Research, Tohoku University; 2Neutron Source Section, Materials and Life Science Division, J-PARC Center; 3Neutron
Science Section, Materials and Life Science Division, J-PARC Center

Science Highlights

49

Magnetic Excitation Spectra of Superconducting
Ca10Pt4As8(Fe1-xPtxAs)10 (x~0.20)

The multiband nature of Fe-based superconductors is a significant characteristic thatdifferentiates them from high–Tc Cu oxides. Keepingthat in mind, we have been working to see whether
the superconductivity in Fe pnictides has a newpairing mechanism related to this multiband nature(or to the orbital degrees of freedom).
Up to now, a number of papers have been
published suggesting that the magnetic mechanism
similar to that of Cu-oxides is primarily important
for the occurrence of the superconductivity of Febased systems, and that the so-called S± symmetry
with the sign reversal of the order parameters D
between two disconnected Fermi surfaces aroundG [=(0, 0)] and (0.5, 0) (≡QM) points in the reciprocal
space is realized [we use the 2-D unit cell of FeAs
square lattice with one Fe atom within a cell, where
the Qx axis in the reciprocal space is defined along
the Fe-Fe direction]. On the other hand, if the orbital
fluctuation mechanism, which may arise from theorbital degrees of freedom is important, we do not
expect the sign reversal (S++ symmetry).
To investigate which of the symmetries S± andS++ is realized, we have paid attention to three kindsof physical quantities sensitive to the sign reversal,
that is, effects of nonmagnetic impurities on Tc,
magnetic excitation spectra and NMR 1/T1 havebeen carefully studied on LnFeAsO1-xFx or so-called
Ln1111 system (Ln=La and Nd).
One remarkable result we found at the very
early stage of the study is that the Tc-suppression
rates are much smaller than those expected fromthe pair breaking effect of nonmagnetic impurities insystems with the S± symmetry of D [1]. It suggests
the existence of a new pairing mechanism [1,2], because it is strongly against the magnetic
mechanism and because the ordinary phononmechanism cannot realize the maximum Tc value of~55 K observed for NdFeAsO1-xFx.
Measurements of magnetic excitation spectrac”(q, w) by neutron inelastic scattering can present

50

Science Highlights

a different method to distinguish the symmetries
of S± and S++: According to the simple calculation[3], the spectra c”(QM, w) of systems with S±
symmetry of D exhibit a sharp resonance peak at
w equal to or slightly smaller than DG+DM in the
superconducting state, where DG and DM are theD values on Fermi surfaces around G point andaround QM, while such a peak does not appear
for the S++ symmetry. Experimentally, there aremany publications which report observations of
the “resonance-like” peak in c”(q, w). However,the peaks do not seem to be as sharp as those
expected for the S± symmetry of D. Moreover, if theobservations are the evidence for the S± symmetry,
they contradict the small rates of Tc-suppression
by nonmagnetic impurities. On this point, Onariet al. [4] pointed out, by considering a different
mechanism from that of ref. 3, that even for the S++
symmetry, the peak in c”(QM, w) with larger energy
broadening than that of ref. 3 can be expected in
the region slightly larger than DG+DM. Therefore,
it was highly desirable to carry out careful studyof c”(QM, w) to judge whether the change of thespectral shape induced by the superconductivity
really indicates the S± symmetry of D.
Here, the measurements have been carriedout with the spectrometer 4SEASONS (BL-01)
installed at J-PARC on a single crystal (~4.5 g) of
Ca10Pt4As8(Fe1-xPtxAs)10 (x~0.20) with Tc~30 K,
where the crystal was set on the Al sample holder
with the c axis parallel to the incident neutron beam
and cooled down by using the He exchange gas.
The incident neutron energy of 40.4 meV wasmainly used. The energy resolution was ~1.7 meVat the neutron transfer energy DE~10 meV. Readers
can find other details in refs. 2 and 5. In arguingthe data, we paid attention to the shape of the“resonance-like” peak in the Q-w space.
In Fig. 1, the map of the magnetic scattering
intensity S(Q, w)=(n+1)c”(Q, w) collected throughthe DE window of 11 meV<DE(=w)<14 meV at T=4

Figure 1.	 Intensity map of the magnetic scattering in the
a*-b* plane of Ca10Pt4As8(Fe1-xPtxAs)10 (x~0.20).

K is shown in the (Qx-Qy) plane of -1.0<Qx, Qy<1.0,
where n is the Bose factor. We can see the intensity
peaks at (Qx, Qy)=(0.5, 0) and other equivalentpoints as reported commonly to many other Febased superconductors. [Although in the actual
measurement, the Qz value depends on DE for each
(Qx, Qy) point, we do not show it explicitly for thepresent quasi two dimensional system.] The peakwidths along the Qx- and Qy-directions are different
from each other, as reported for Ba122 and Ca122
systems. We do not see any other meaningful peakstructure in this figure.

Figure 2 shows the neutron scattering intensities
collected with the window of 10 meV<DE <14 meVby the Qx scan through Q=(±0.5, 0) at various fixed
T values. The Qy windows are shown in the figure.
(Data taken with different Qy windows are so scaled
as to show the intensities per unit value of Qy width,dQy.) In Fig. 3. the spectra c”(QM, w) are shown
against DE above the backgrounds (dotted line; It
was found to be T- and DE -insensitive in the region
DE >5 meV) at several fixed T values.
After showing the above data as examples ofdata series collected with various window-widths,
dQ and dDE, we note here the following. (1) Boththe Qx- and DE-widths do not depend on the window
widths or resolutions, that is, they are intrinsic
values. We stress here, in particular, that the energy
width of the peak of the c”(QM, DE) curve is muchlarger even at T<<Tc than the resolution width shownby the horizontal bar in Fig. 3. We argue this point
again below. (2) The Qx-width and peak intensity at
QM do not exhibit significant anomalous behavior atTc. (3) The peak energy of the c”(DE)- DE curve is~12 meV. Although it should be compared with thevalue of DG+DM, it is not easy to find reliable gap
values at this moment.
Concerning the Qx- and DE-widths of the peakof c”(QM, DE), we presume the following: Let us
consider systems with nonmagnetic impurities.
Because it can be considered to have a Hamiltonian
with time-reversal symmetry, Cooper pairs in such

Figure 2.	Neutron counts obtained at 4 K by the Qx scan. The Qy regions of the data collection are shown in the
figure. 10 meV<DE<14 meV.

Science Highlights51

χ"(Q, ∆E) (arb. unit)8

T= 4 K
21 K
46 K
72 K

Ca-Fe-Pt-As
Tc~30K
Q=(0.5, 0)

6

momentum space, but do not in the energy space,
unless the localization effects become significant.
It suggests that the peak should be sharp if thesymmetry is S±, which does not agree with theobservation. The present arguments are consistent
with the nonexistence of the pair breaking effects bynonmagnetic impurities and seem to support the S++
symmetry.

4
2
0
0

5

10

15

20

energy ∆E (meV)25

Figure 3.	c”(Q, w) observed at Q=QM (=0.5, 0) are plottedagainst DE (=w) at several T values.

M. Sato Fig. 3
systems consist of two quasi particles which havesame eigen energies (consider the Anderson
theorem). However, these quasi particles are not in
the momentum eigen states. Therefore, the spectrac”(Q, DE) automatically have the broadening in the

References[1]	M. Sato, Y. Kobayashi, S. C. Lee, H. Takahashi,
E. Satomi, and Y. Miura, J. Phys. Soc. Jpn. 79(2010) 014710.
[2]	M Sato, and Y Kobayashi, Solid State Commun.
Special Issue on Iron pnictides 152 (2012) 688..
[3]	T. A. Maier and Scalapino: Phys. Rev B 78
(2008) 020514.
[4]	S. Onari, H. Kontani, and M. Sato: Phys. Rev. B
81 (2010) 060504 (R).
[5]	M. Sato, T. Kawamata, Y. Kobayashi, Y. Yasui, T.
Iida, S. Suzuki, M. Itoh, T. Moyoshi, K. Motoya,
R. Kajimoto, K. Nakamura, Y. Inamura, and M.
Arai: J. Phys. Soc. Jpn. 80 (2011) 093709.

M. Sato1,2,3, T. Kawamata2,3, Y. Kobayashi2,3, Y. Yasui2,3, T. Iida2, K. Suzuki2, M. Itoh2,3, T. Moyoshi2, K. Motoya2,3,
R. Kajimoto1, M. Nakamura4, Y.Inamura4, and M. Arai3,5
1
CROSS-Tokai; 2Department of Physics, Nagoya University; 3JST TRIP; 4Neutron Science Section, Materials and Life Science Division, J-PARC
Center; 5Materials and Life Science Division, J-PARC Center

52

Science Highlights

A New Solid Electrolyte Li10GeP2S12 for Li-Ion Batteries

From the point of view of improving the safetyof the lithium-ion batteries, the non-flammable solid
electrolytes have the promising potential to replace
the currently used liquid organic electrolytes. Although the advantages of solid electrolytes are widely
acknowledged, their low ionic conductivities prevent
them from being used in practical applications.
In the search for new materials for solid electrolytes over the past few decades, crystalline,
glassy and polymer systems were studied. Despite
these efforts, the lithium nitride Li3N, discoveredin 1970s, still has the highest ionic conductivityof 6 x 10-3 W-1cm-1. Unfortunately, however, its low
electrochemical decomposition potential prevents
it from being used in practical applications. Other
systems currently investigated as potential battery
electrolytes are crystalline materials (La0.5Li0.5TiO3,
Li3.25Ge0.25P0.75S4) and glassy materials (Li7P3S11,
Li2S-SiS2-Li3PO4); all these materials exhibit ionic
conductivities of the order of 10-3 W-1cm-1, which islower than that of Li3N. Polymer electrolytes arecomplexes of lithium salt and high-molecular-weight
polymers, but they have low conductivities of ～10-5
W-1cm-1. None of these materials has conductivities
comparable to those of the currently used liquid organic electrolytes of the order of 10-2 W-1cm-1.
Recently a new lithium superionic conductor
Li10GeP2S12 exhibiting an extremely high lithium ion
conductivity of 1.2 x 10-2 W-1cm-1 was discovered byresearchers of Tokyo Institute of Technology andToyota Motor Corporation, and its crystal structure
was determined in cooperation with the researchersof KEK. The structure analysis was carried out using
the high-resolution neutron powder diffractometer

SuperHRPD installed at J-PARC. The crystal structure is shown in Fig. 1a. The structure is tetragonal(space group P42/nmc ) with lattice parameters of a
= b = 8.7177 Å and c = 12.6345 Å. The structure isa three-dimensional framework structure consistingof (Ge0.5P0.5)S4 tetrahedra, PS4 tetrahedra, LiS6 octahedra and LiS4 tetrahedra. Figure 1b shows a framework structure composed of (Ge0.5P0.5)S4 tetrahedra,
LiS6 octahedra and PS4 tetrahedra. Figure 1c shows
one-dimensional (1D) chains of LiS4 tetrahedra
along the c axis. Lithium ions at the 16h and 8f sites
in LiS4 tetrahedra (Fig.1c) are considered to participate in ionic conduction and form the 1D conduction
pathways. These 16h and 8f sites were found to beoccupied by 69 and 64% of Li, respectively; the result indicates partial distribution of lithium ions on the
conduction pathway, which is a common characteristic of the superionic conductors.

Figure 1.	(a) Crystal structure of Li10GeP2S10. (b) Framework structure of (Ge0.5P0.5)S4 tetrahedra, LiS6
octahedra and PS4 tetrahedra. (c) 1D conduction
pathways of lithium ions along the c axis. The zigzag conduction pathways are indicated.

N. Kamaya1, K. Homma1, Y. Yamakawa1, M. Hirayama1, R. Kanno1, M. Yonemura2,3, T. Kamiyama2,3, Y. Kato4, S. Hama4,
K. Kawamoto4, and A. Mitsui5
1
Department of Electronic Chemistry,Tokyo Institute of Technology; 2Neutron Science Section, Materials and Life Science Division, J-PARC
Center; 3Institute of Materials Structure Science, KEK; 4Toyota Motor Corporation, Battery Research Division; 5Toyota Motor Corporation,
Material Engineering Management Division

Science Highlights

53

Quantum Renormalization Effect in
One-Dimensional Heisenberg Antiferromagnets

One-dimensional (1D) antiferromagnetism is
one of the most mature areas in condensed matter research, in particular, the quantum nature for
S = 1/2, where S is the spin quantum number ofmagnetic ions, is well understood. The ground stateof a 1D Heisenberg antiferromagnet (1DHAF) with
S = 1/2 is the degenerate singlet spin state (Bethe
state), rather than the antiferromagnetic Néel state.
The lowest spin excitations from the Bethe state
are renormalized from the classical spin-wave state
excited from the Néel state, where the lowest spin
excitation energy can be described by E(q) = 4SRJ
|sin q| with the exchange constant J, and the enhancement of excitation energies compared tothose of a classical system is defined by the quantum renormalization factor R; R = p/2 for S = 1/2.
More generally, quantum effects that depend on
the value of S require further investigations. The
Haldane conjecture, which suggests a spin gap for
integer S but no gap for half integer S, is conspicuous as an important milestone. It is well known thata 1DHAF with S = 5/2 behaves classically. However, the spin dynamics between S = 1 and 5/2 has
not been confirmed, as there is a lack of consistentexperimental data.

To detect the S-dependent quantum renormalization effect, inelastic pulsed neutron scattering experiments were performed at KENS and ISIS using
the 1DHAFs CsVCl3 (S = 3/2), CsVBr3 (S = 3/2), andCsCrCl3 (S = 2), as well as CsNiCl3 (S = 1) as a reference system. At present, we improved the result
by confirming E(q) for CsVCl3 on the High Resolution Chopper Spectrometer (HRC) at MLF, also by
newly analyzing data for the other materials [1].
Fig. 1 shows excitation spectrum for CsVCl3 measured on the HRC, where spin excitations were wellobserved in the entire Brillouin zone up to the zone
boundary energy and E(q) could be determined as
peak positions of spin excitations. E(q) for 1DHAFs
determined in this study are summarized in Fig.
2. To discuss the quantum renormalization effectquantitatively, the value of J should be determined,
because E(q) provides the product RJ. The evaluation of R was successful for S = 1/2 and 1, because
quantum theories describing c(T), the temperature(T) dependence of the magnetic susceptibility, exist for both S = 1/2 and 1 as a function of J. On theother hand, no rigorous theory exists for S = 3/2 and2. We measured the dynamical structure factor of
the spin excitations S(q,E) to determine E(q). The

Figure 1. Excitations in CsVCl3 observed on the HRC at T = 20 K with Ei = 100 meV

54

Science Highlights

Figure 2.	Dispersion relations of the lowest spin excitations at low temperatures in 1DHAFs. The solid lines on the data points(marks) are fitted dispersion curves. The sine curves with bars are the dispersion relations of classical spin waves.

static spin correlation function S(q) was deduced byintegrating S(q,E) over E, following which k(T), theT dependence of the inverse magnetic correlation
length, was obtained as a width of S(q). The valueof J can be determined from k(T), because k(T) is
described as a function of J for any S by the quantum theory.
In Fig. 2, the sine curves with bars are the classical dispersion relations estimated by J, which
was determined from k(T), and the bars represent
the experimental uncertainties from the determination of J. The values of R, which is the ratio of E(q)at the zone boundary (q = 0.5 rlu) to the classicalspin wave energy, were in good agreement with thequantum renormalization factors predicted by quantum Monte Carlo calculations. We could determine
the quantum renormalization factors by only inelastic pulsed neutron scattering experiments.
References[1]	S. Itoh, T. Yokoo, S. Yano, D. Kawana, H.
Tanaka and Y. Endoh, J. Phys. Soc. Jpn. 81(2012) 084706.

S. Itoh1,2, T. Yokoo1,2, S. Yano3, D. Kawana2, H. Tanaka4, and Y. Endoh2
Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK; 3Aoyama
Gakuin University; 4Tokyo Institute of Technology

1

Science Highlights

55Facility Research andDevelopment Highlights

Effect of the Si Interlayer on the Magnetic and Mechanical
Properties of Fe/Ge Polarizing Multilayer Mirrors

Introduction
The neutron polarizing supermirror is one of themost important optical devices for polarizing neutron beams. Polarizing supermirrors need to display
high polarizing efficiencies at low external magnetic
fields to meet a variety of research demands. As
shown by Hino et al. the strength of the external
magnetic field required to achieve efficient neutron
polarization (Hpol) can be suppressed by the use of
an Fe/Si/Ge/Si multilayer, which is obtained by adding a thin Si interlayer into the Fe/Ge multilayer. In
this study, we investigated the magnetic and mechanical properties of Fe/Si, Fe/Ge, and Fe/Si/Ge/
Si multilayers to elucidate the mechanism that controls Hpol for a polarizing supermirror [1].
Experimental
Polarized neutron reflectivity measurement was
performed on a SUIREN reflectometer installed at
the research reactor, JRR-3, in the JAEA. The polarized neutron reflectivity profiles were measured during re-magnetization of the Fe/Si/Ge/Si supermirror
with m=2.8 after it had been saturated in a field of 10
kOe opposing the guide field of the neutron beam
to evaluate Hpol. The measured reflectivity profiles

are shown in Fig. 1. The flipping ratio of the Fe/Si/
Ge/Si supermirror is increased to a value of morethan 30 within the momentum transfer range 0.3 <qz < 0.61 nm-1 under an external field strength of 4.0
kOe, at which the Fe/Si/Ge/Si supermirror is magnetized to saturation. Hpol for the Fe/Si/Ge/Si supermirror was evaluated to be 200 Oe since the flipping
ratio coincides with that at saturation. The samemeasurement was performed for the Fe/Si and Fe/
Ge supermirrors. The result is summarized in Table
1. This result shows that Hpol for a neutron polarizing supermirror with m=2.8 is effectively reduced to
200 Oe by the addition of a Si interlayer to the Fe/
Ge multilayer. The ratio of the magnetization underHpol to that at saturation was estimated to be in therange of 97.5%–98.5%. In subsequent discussions,
we assume that the ratio of the magnetization underHpol to that at saturation is 98%.
Table 1. Estimated Hpol and external field at saturation Hs.

Fe/Si
Fe/Ge
Fe/Si/Ge/Si

Hs (Oe)Hpol (Oe)

2000
7000
4000

600
400
200

Figure 1. Polarized neutron reflectivity profiles for Fe/Si/Ge/Si supermirror with m=2.8.

58

Facility Research and Development Highlights

Figure 2. Dependence of estimated Hpol on compressive stress for Fe/Si, Fe/Ge, and Fe/Si/Ge/Si multilayers.

Fe/Si, Fe/Ge, and Fe/Si/Ge/Si multilayers with amultilayer period of 12 nm were fabricated to examine the dependence of Hpol on the film stress.
This multilayer period was chosen because it isrepresentative of the sequence occurring in a supermirror with m=2.8. Hysteresis measurement
was performed to evaluate Hpol on a SQUID magnetometer. Stress measurement was performed ona laser scanning displacement meter. Stress in thelayers was determined from the radii of curvaturesof the Si substrates before and after deposition. The
dependence of the estimated Hpol on compressive
stress is plotted in Fig. 2. When we fix the numberof periods and the multilayer period, Hpol is clearlyseen to be linearly dependent on the compressive
stress. These measurements and analyses show
that, within the parameter ranges explored in thisstudy, a reduction in the compressive stress effectively reduces Hpol for a polarizing supermirror.

Conclusions
The polarized neutron reflectivity measurement
showed that Hpol is effectively reduced to a valueof 200 Oe for a neutron polarizing supermirror with
m=2.8 by adding a Si interlayer to the Fe/Ge multilayer. Magnetization and stress measurements for
Fe/Si, Fe/Ge, and Fe/Si/Ge/Si multilayers showedthat the technique of adding Si interlayers to the Fe/
Ge multilayer is effective in reducing compressive
stress and that Hpol is found to be proportional tothe compressive stress. This study confirmed that a
reduction compressive stress is very important for ahigh-performance neutron polarizing supermirror.
References[1]	R. Maruyama et al., J. Appl. Phys. 111 (2012)
063904.

R. Maruyama1, D. Yamazaki1, S. Okayasu2, M. Takeda3,4, N. Zettsu5, M. Nagano5, K. Yamamura5, H. Hayashida6,
and K. Soyama6
1
Neutron Instrumentation Section, Materials and Life Science Division, J-PARC Center; 2Advanced Science Research Center, JAEA; 3Neutron
Science Section, Materials and Life Science Division, J-PARC Center; 4Quantum Beam Science Directorate, JAEA; 5Graduate School ofEngineering, Osaka University; 6Neutron Instrumentation Section, Materials and Life Science Division, J-PARC Center

Facility Research and Development Highlights

59

Multiwire-type Two-dimensional Neutron Detector with
Individual Readout and Optical Signal Transmission System

Introduction
We are currently developing a position-sensitive
neutron detection system that can read out individual signal lines and consists of a two-dimensional
detector element [1−2]. In the neutron scatteringexperimental facilities, there are some difficulties
as compared to a small experimental laboratoryenvironment, for example, a long distance from asample irradiation area to a data acquisition room,
massive and inconvenient neutron shieldings,
complicated background noises arisen from many
sample environments, etc. We consider an opticalfiber to be a promising candidate for a signal transmission device because the optical fiber has good
properties such as an excellent optical transmission
capability of less than a few dB/km, wide optical signal bands, a light weight, and no sensitivity to electromagnetic forces. Therefore, we have developed
a neutron detector system that uses optical signaltransmission devices to ensure that the system canbe operated and meet the challenges to its performances in these facilities.
Developed Detector System
A developed neutron detector system consists ofa 256 channel multiwire detector element (x: 128
lines, y: 128 lines) equipped into a pressure vessel,
amplifier-shaper-discriminator (ASD) boards, optical signal transmission devices, position encoders
with field-programmable gate arrays (FPGAs), anda fast data acquisition device. The photograph ofthe developed system is shown in figure 1.
The pitches of each axis are 1 mm and the conversion gap is 15 mm. The charge signals collectedby the detector element were amplified, shaped,
and discriminated by ASD application-specific integrated circuits (ASICs). The nominal settings of the
ASD-ASICs had an amplification factor of 3.1 V/pC
and a decay time of 90 ns. Digital signals from theASD-ASIC were transmitted to the position encoders via optical fibers as optical signals converted by
specially-fabricated E/O-O/E converters. The specially-fabricated optical devices used FPGAs with
106 MHz clocks and 1.06 Gbps optical transceivers.
A developed 1-unit VME module equipped with an
O/E converter and a position encoder is shown infigure 2. Multimode optical fibers and transmission
light at 850 nm were used for transmitting the optical signals.
Figure 3 shows a typical pulse shape at anodes

35 cm

Optical fiber

35 cm
Figure 1. Photograph of a developed two-dimensional neutron detector system.

60

Facility Research and Development Highlights

Position encoder

Optical transceivers
Figure 2. Specially-fabricated 1-unit VME module.

Output signal (a.u.)

0.2

Position encoder out

0
Period 1 µs
Period 2 µs

-0.2

-0.4

-0.6

-1

0

1

2

3

Time (µs)

Figure 3. Output pulse shapes from ASD-ASIC.

and a cathode line after modification by the preamplifier in the ASD-ASIC under neutron irradiation
measured using a 1.5 GHz oscilloscope (Lecroy,
LC684DM). A signal-pulse peak of neutrons can beclearly observed with a fast temporal response; the
FWHM of the response time was 180 ns. To evaluate the time response of our whole signal processing system, double pulses with various time durations were entered into the system. Figure 4 shows
the output signals from the position encoder when

Figure 4.	Output signal from position encoder. Double
pulse with time interval of 1 and 2 ms.

the double pulse with a time interval of 1 and 2 ms
is input. It was found that our system can separate
signal pulses with a time interval of 1 ms.
References[1]	H. Yamagishi, K. Toh, T. Nakamura, K. Sakasai
and K. Soyama, J. Instrum. 6 (2011) C12025.
[2]	K. Toh, T. Nakamura, K. Sakasai, K. Soyama
and H. Yamagishi, J. Instrum. 7 (2012) C01025.

K. Toh1, T. Nakamura1, K. Sakasai1, K. Soyama1, and H. Yamagishi2
1
Neutron Instrumentation Section, Materials and Life Science Division, J-PARC Center; 2Nippon Advanced Technology Co. Ltd. (NAT)

Facility Research and Development Highlights

61

Damage Inspection of the 1st Mercury Target Vessel of JSNS

Introduction
The mercury target vessel of the JSNS, which
is made of SS316L, is damaged by the proton andneutron irradiation during operation. Furthermore,
the beam window portion where directly affected by
the proton beams is also damaged by pressure wave
inducing cavitation, because the proton beam injection produces the pressure waves in mercury due
to heat deposition. The cavitation damage, which iscorrelated with the beam power and operation time,
has a considerable effect on the lifetime of the target vessel. Damage inspection of the target vessel isimportant to determine the lifetime of the vessel. The
1st mercury target vessel was operated up to 475
MWh since 2008, and achieved 200 kW operation
at the maximum. Because a part of the vessel wasdamaged due to the Great East Japan Earthquake
in 11th March it was necessary to replace the target
with a new one. Before replacing the target vessel,
we cut out the disk from the spent target vessel toobserve the damage which affects the lifetime reduction and to provide the test specimen for the post
irradiation examination to evaluate the changes inmechanical properties caused by irradiation.
Cutout from target vessel
Figure 1 shows photographs of the cutout procedure. The beam window portion of the target vessel
was cut out with a hole-saw. A cutout disk specimen
with a diameter of 50 mm was taken out from thesaw, and cleaned using ultrasonic bath to remove
the mercury. All processes were conducted by theremote handling.
Damage inspection
Inside of the target vessel was inspected by putting a scope camera into the cutout hole of the beam
window potion to observe flow inducing erosion andcavitation damage. Figure 2 shows the images ofthe flow guide and the beam window portion. Flowinducing erosion around the flow guide edge where

62

Facility Research and Development Highlights

Beam window

Mercury target vessel

Cutting by hole-saw

Hole-saw with cut disk

Cleaned cut disk

Figure 1. Photographs of cutting procedure.

Upper wall

Flow guideCut hole

Damage cluster
Hg ﬂow
Figure 2.	Captured images of the flow guide and the beam
window portion inside the target vessel.

flow velocity exceeds 1 m/s was not observed in thecaptured image. Around the cutout hole at the beam
window part, the damage cluster induced by cavitation is recognized. However, the clear cavitation
damage was not observed except for the damage
cluster part.

cated to observe the surface profile using a laser
microscope. Figure 3(b) shows the microscopic image of the localized pit. A crack was observed at theedge of the localized pit. It may have been causedby the repetition of the cavitation impact. The depthof the localized pit in the figure is about 120 mm.
In consideration of a homogeneous erosion on thedamage clusters, we concluded that the maximum
eroded depth of the beam window is 250 mm.

The cleaned cut disk was particularly observedin order to measure the eroded depth due to thecavitation. Macroscopic observation was performed
using a high resolution video camera. Figure 3(a)shows captured images of the cutout disk. Cavitation damage clusters are recognized at the centerand around both sides at 15 mm from the center.
This damage distribution may be related to the pressure distribution. Detailed consideration is undergoing through the numerical simulation. Near the damage clusters, isolate pits were observed. The isolate
pits seem to be delaminate a part of modification
layer which had been treated to harden the beam
window potion aiming for the cavitation damage reduction. In the damage cluster at the center, deep
damage, so called localized pit, was recognized.
Furthermore, the cutout disk surface was repli-

Summary
We have succeeded in the damage inspection of
the 1st mercury target vessel with the help of many
people. Useful data to determine the lifetime of thetarget vessel, i.e. the beam power and operation timedependencies on the eroded depth, was obtained.

Localized pit

Top

Damage clusters

Isolate pits
2 mm

10 mm

Bottom(a) Macroscopic image

Crack

Confocal image

100µm

Depth contour

100µm

Depth, μm

0
-40
-80
-120
-160

0

200

400

600

800

Distance, μm

1000

1200

(b) Microscopic image of localized pit
Figure 3. Images of cutout disk surface.

T. Naoe, M. Teshigawara, T. Wakui, and H. Kinoshita
Neutron Source Section, Materials and Life Science Division, J-PARC Center

Facility Research and Development Highlights

63

Radiation Safety

Radiological license update and inspection
An application for radiological license update
was submitted in September 2011, and the test use
was approved in November 2011. The followings
items were newly approved in the application:• Installation of a neutron beam line of BL09•	Partial change of the shield configuration toprepare it for installation of the ultra-slow-muon
beam line
The government inspection for the update wascarried out on February 6 and 7, 2012. The inspections for the previous applications approved in November 2010 and February 2011* as test use wereconducted at the same time because those were
postponed due to the disaster on March 11, 2011.
The final approval for the whole inspections was issued on February 14, 2012.
Development of “UHAM”; Radioactivity monitoring system for the mercury system
The test operation of the monitoring system of
the mercury target failure using radioactivity detection was started in October 2009, and continued
until just before the 3.11 disaster. The monitor wascalled “HAM”, which means “Helium-layer Activity
Monitor”†. We could confirm, by the test operation,that the “HAM” system had enough sensitivity tocatch the primary failure by detecting a tiny leak ofradioactive products from the inner vessel [1]. The
practical operation of the “HAM” system started
when the beam operation was restored in December 2011.
In order to monitor the health of the whole mercury circulation system from the viewpoints of radioactivity confinement, a total monitoring systemcalled “UHAM” was designed and constructed; the“HAM” system was unified with the total system.
The conceptual diagram of the “UHAM” system isshown in Figure 1. The operation of the total system
was started in March 2012.
*	The previous applications included the intensity powerup from 250 to 320 kW, installation of the neutron beamlines, etc. The details are indicated in MLF Annual Report
2010.
†	The mercury target has double walls; there is an intermediate layer containing helium gas between the walls.
By the “HAM” system, the helium gas in the intermediate
layer are continuously sampled and checked with gamma-ray spectroscopy analysis.

Figure 1. A conceptual drawing of the whole diagram of “UHAM” system.

64

Facility Research and Development Highlights

The “UHAM” system consists of “HAM”, “CAM”
and “VAM”. The “CAM” is a gas monitor of the hotcell in which the mercury circulation system has
been installed, and “VAM” is that of the helium vessel enclosing cold-neutron production devises suchas hydrogen moderators and beryllium reflectors.
As preparation for the future 1-MW operation,
we are planning to upgrade the mercury system asfollows:•	Mercury-bubbling operation will be started for
mitigation of cavitation damage.
•	The target design will be modified to minimize
the exchange part for waste reduction.
However, these upgrades may increase the riskof radioactivity leakage. The “CAM” and “VAM” arenecessary to take rapid measures by detecting theradioactivity leakage as early as possible.
Issue on Tritium behavior
In November 2011, the first attempt of the targetvessel exchange was successfully conducted. However, during the exchange process, a significant tritium release was observed, and the total amount of
released tritium was much higher than our estimate
which we evaluated based on the tritium-analysis
measurement of helium gas injected in the mercury
circulation system. The following is just one possible explanation of this phenomenon•	Considerable amount of tritium was adhered in

the structural material of the mercury circulation
system during the beam operation.
•	Adhered tritium was released by the effect of isotope exchange with water-vapor of air.
For the preparation of the next target exchange,
an analytical understanding of the tritium behavior
is essential in order to prevent uncontrolled releaseof tritium. In any case, by purging the mercury circulation system, a large volume of radioactive gas will
be produced. This forced us to change the scenarioof the radioactive-gas process. Therefore we decided to adopt an “active” process instead of the “passive” process which means just keeping the gas fora year.
As a new device for the “active” process, a “coldcharcoal trap” will be adopted. The test apparatus
will be made in the beginning of the fiscal year of2012, and it will be tested in the summer. The fulldevice will be installed by the end of the next fiscal
year.
References[1]	Y. Kasugai, K. Otsu and T. Kai, “Monitoring
System of Mercury Target Failure Using
Radioactivity Measurement”, Proceedings of the
19th Meeting of the International Collaboration
Advanced Neutron Source (ICANS-XIX), March
8-12, 2010, Grindelwald, Switzerland.

Y. Kasugai, M. Ooi, M. Harada, K. Ohtsu, H. Kinoshita, M. Seki, and T. Kai
Neutron Source Section, Materials and Life Science Division, J-PARC Center

Facility Research and Development Highlights

65

Time-Transient Measurement of Hydrogen Absorption
Process by NOVA

Introduction
In-situ H2/D2 gas atmosphere measurement isimportant to understand the mechanism of hydrogen absorption and desorption process in materials. On NOVA, a sample environment to control
hydrogen composition in a sample by controllingthe sample temperature and the hydrogen pressure has been equipped. This environment is able
to measure Pressure-Composition isotherm (PCT)
curve and the sample environment is called as PCT
environment. Highest H2/D2 gas pressure is 10 MPa
with controlling the sample temperature from 50 K
to 473K. The layout of the PCT environment is depicted in Figure 1.
PCT and in-situ measurements
Measurement of PCT curve of LaNi5, which iswell-known hydrogen storage material, was performed with D2 gas successfully on the beam posi-tion of NOVA as shown in Figure 2. By increasing
the D2 gas pressure, the content of D2 (D/M) in LaNi5
increases. From lower to higher D/M, three regions
appears: solid-solution region (< 0.2 D/M), twophase (solid-solution and hydride) region (0.2 ≤ D/M< 1.0) and hydride region ( ≥ ~1.0 D/M). At eachhydrogen contents pointed by numbers enclosed inparentheses in Figure 2, neutron diffractions were
measured as shown in Figure 3. According to thehydrogen absorption and desorption, diffractions
from solid solution, two-phase region, hydride, twophase region and solid solution were measured.
Time transient measurement
By utilizing event-mode DAQ recording system(DAQ-middleware), time-transient measurement iseasily performed. Figure 4 shows the demonstrated
result of measurement of hydrogen absorption process of LaNi5. The sample was kept in vacuum by

Figure 1. Sample environment Pressure-Composition isotherm (PCT) measurement on NOVA.

66

Facility Research and Development Highlights

5
4

(4)

3
2

0

Deuterium pressure, P / MPa

10

7
6
5

Hydrogen absorption

4

(3)
(5)

3

(2)

2

10

(6)

-1

Hydrogen desorption

closing a valve and certain pressure of D2 gas wasfilled in PCT (3 MPa in Figure 4). Opening the valve
begins hydrogen absorption process. In 400 sec, it
is clearly observed that the sample became hydride(LaNi5D6.6) through two-phase region.
In Figure 4, diffraction profiles were obtained byintegrate neutron counts at every 8 sec. The timeinterval can be optimized after the experiment taking accounts the statistics. Since the pulsed neutron
at MLF generated at every 40 msec, minimum timeinterval is 40 msec.

7
6
5
4

LaNi5D6.6

3

400

2

-2

(1)

0.0

0.2

0.4
0.6
0.8
1.0
Deuterium content, D/M

1.2

Figure 2. PCT curve LaNi5 measured the PCT sample environment of NOVA.

Time / sec

10

LaNi5-D2 at 303 K

0

0

LaNi5
(1) LaNi5

2

3

4

3

Deuterium press.
/ MPa

5

d/Å
(2) LaNi5D0.23

Figure 4. shows diffraction data that was summed event datawith time-interval of 8 sec.

(3) LaNi5D3.33

I(d)(4) LaNi5D6.60(5) LaNi5D4.03(6) LaNi5D0.72(ref.) LaNi5
Al2O3

1

2

3

d/Å

Figure 3. Neutron diffraction of LaNi5-Dx measured on NOVA.
Numbers enclosed in parentheses correspond to hydrogencontents shown in Fig. 2.

Even J-PARC, one-pulse measurement is quite
challenging but shorter time interval may be feasible by selecting neutron counts at same sample environments (temperature, pressure, magnetic fields
and so on) if the phenomenon is reversible.
It is noteworthy that such time-transient measurements are feasible at every beam lines at J-PARC.
Utilization of event-mode recording will be progressed and expected to open new opportunities
for materials & life science researches.

T. Otomo1,2, K. Ikeda2, H. Ohshita1,2, N. Kaneko1,2, T. Seya1,2, and K. Suzuya1
Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK

1Facility Research and Development Highlights

67

Development of Remote Access

Introduction
A lot of users of MLF perform a variety of experiments by using the MLF instruments. Because
many experiments are performed automatically, it isnecessary to monitor their experiment status fromthe users’ desk or the dormitory. Additionally, theseexperiments produce an enormous amount of raw
data whose total size is about a petabyte per year
at the full performance of J-PARC. It is unrealisticthat the users coming from the outside of MLF bringback these data to their home laboratories. It is required that analysis and visualization of stored data
in MLF can be performed from their home laboratories via a network.
We have investigated and considered several
remote access patterns and started to develop thethree remote access methods shown in Fig.1. Byusing these remote access methods, the users canmonitor the progress status of their experiments
and analyze and visualize their data from the outside of MLF.

Development
To monitor the currently-executing experiment status, we have developed the web service which monitors the current status of the data acquisition (DAQ)
system in each instrument. We have developed the
web-based data reduction and visualization with the
database, called MLF Experiment Database (MLF
EXP-DB). The MLF EXP-DB is connected with oursoftware framework [1], called IROHA and manages
not only the produced raw data but also the experimental metadata. The MLF EXP-DB automaticallyregisters the experimental raw data and metadata produced with the DAQ system and the IROHA. We cando the standard data reduction and visualization of theregistered data through a web browser as shown in
Fig.2. For the advanced analysis from the outside of
MLF, the users will login to the MLF computational resources via a network and analyze their data stored in
MLF interactively. The authentication system is underdevelopment that is connecting with the user-identification information in the database of the J-PARC Users Office by taking into account the security policy.

Experiment status
Web
Dormitory

Instruments

Standard analysis
Analyzed data
MLF EXP-DB

User

Home laboratory

Advanced analysis
Analyzed data
Login

Figure 1. Three kinds of the remote access method in MLF.

68

Facility Research and Development Highlights

Authentication

Analysis farm

Figure 2. Standard analysis through a web browser.

Summary
We have developed the remote access in MLF,
which includes monitoring of the DAQ status in each
instrument as a web service and web-based data
reduction and visualization with the MLF EXP-DB.
Currently, these methods are available in J-PARC
LAN, we are going to open them to the Internet in
the next year.

References[1]	T. Nakatani, Y. Inamura, T. Ito, S. Harjo, R.
Kajimoto, M. Arai, T. Ohhara, H. Nakagawa,
T. Aoyagi, T. Otomo, J. Suzuki, T. Morishima,
S. Muto, R. Kadono, S. Torii, Y. Yasu, T.
Hosoya and M. Yonemura: Proceedings of
ICALEPCS2009 673-675.

T. Nakatani1, Y. Inamura1, K. Moriyama1, and T. Otomo1,2
1
Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK

Facility Research and Development Highlights

69Current Status of Sample Environment at MLF

Introduction
Since the reorganization of the sample environment (SE) team in the MLF neutron facility in 2008,
the SE team has discussed how we should contributeto the user support in SE to keep up with the demands
for SE, in addition to the update of the SE protocol. After the earthquake in March 2011, the priority of SE in
MLF might have not been so high because we needed to concentrate on the recovery from its damages.
However, we achieved some progress in FY2011, including installation of new SE devices, preparation of
the SE area, transportation of SE devices from KENS
and other activities of the SE technical team.
SE Devices in MLF-neutron
A vertical-field superconducting magnet withasymmetric split coils and 7 T of the maximum field
and a dilution refrigerator as its insert option were
installed in March 2011 and the test operation was
carried out in MLF (Fig. 1). Though these devices
were purchased by the fund of BL17/18, they aredesigned rather as a general-purpose ones taking into account their compatibility with most beamlines. These devices will be available in MLF within
FY2012 after some modification. Another device
installed this fiscal year is a furnace with niobium
heater which can be used to produce temperaturesof up to 1600°C in a vacuum. This furnace is available for both instruments, which have the vacuum
scattering tank and sample table (goniometer).
It is also noted that a pulse magnet system forneutron experiments has been developed by theInstitute for Materials Research (IMR) group in Tohoku University (Nojiri et al.). 40 T of pulsed magnetic field has been successfully applied in an experiment in MLF. Its portable version will be also
installed in the late fall of 2012.
As the number of general-purpose SE devices
increases in MLF, it becomes important to establish
the user support system in SE including their allocation. It is urgent to discuss the issue in the SE team.

70

Facility Research and Development Highlights

Figure 1.	Test operation of the 7 T vertical-field superconducting magnet, performed at the MLF experimental hall 2 in March 2012.

SE AreaIn the last annual report we reported that we set
the SE handling area in MLF experimental hall 1.
In FY2011, the fence was fitted up at the SE area
in experimental hall 1 (Fig. 2(a)). This is about 4 m
x 8 m in area. Then test operation of some devices
such as a new furnace and cryostat has been performed there. We will also prepare another SE area
in experimental hall 2 (Fig. 2(b)). Its size is planned
to be changeable depending on the period of beamon/off so that the area can be effectively used during the time of construction.
Utilities for the SE area are now being prepared.
The electric power supplies (100 V and 200 V 3p)
have been prepared for both the MLF experimental
halls 1 and 2,and the others areas such as coolingwater and helium recovery lines will be also completed in both experimental halls within FY2012.
This progressing work has enabled us to do a minimum SE support. When more SE devices are installed and the number of the users who need touse them increases in the near future, this area will
not be enough to store and prepare the devices one
after another. An area with a much better functionality should be further prepared for maintenance,storage, and so on.

Figure 3.	SE devices transported from Tsukuba Campus of
KEK in November 2012.

operation to re-use them with minimum repairs and/or modifications. These are quite useful particularly
for the beam lines which do not have any equipments. However, we need enough time, manpower,
and funds to repair a part of them.
Figure 2. SE areas in MLF experimental hall 1 (a) and 2 (b).

KENS SE Devices
The KEK neutron facility (KENS) used to use
many neutron SE devices until the proton synchrotron was shut down in 2006. For effective use of
these resources, we selected some of those tobring to J-PARC, such as cryostats, compressors,
sample changers etc. We finished ransporting themin November 2011. The SE technical staffs are now
making a list of the devices and preparing their test

Stepping Forward
The user program has already been restarted,so we should move to the next step where the practical works by the technical staffs is quite important.
It is expected that the number of devices and thevariety of users’ experiments will increase, and thenthe contribution of the SE team becomes essential.
The SE technical team will start training in operationof SE devices trough the users’ experiments. Also,
we should continue to require human resource andto consider improvement of the qualifications of it.

S. Ohira-Kawamura1, T. Yokoo1,2, Y. Yamauchi1, and W. Kambara1
Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK

1Facility Research and Development Highlights

71

Development of an in-situ SEOP 3He Neutron Spin Filter

He has a very large absorption cross section
only for a neutron whose spin is anti-parallel to thatof a 3He nuclei. Moreover, the neutron scatteringcross section of 3He is negligibly small. Therefore,
nuclear spin-polarized 3He gas functions as a neutron spin filter [1]. Compared with other spin filterssuch as Heusler alloys and magnetic super-mirrors,
the 3He gas neutron spin filters have the following
advantages: they can polarize neutrons in a wide
energy range; they are effective for a large divergent beam, etc [2, 3].
3

Figure 1. The developed magnetostatic cavity.

Thus, they are useful in various kinds of neutron beam experiments. So far, we have been developing an in-situ spin exchange optical pumping(SEOP) 3He neutron spin filter to apply it to neutron
scattering experiments at J-PARC [4]. To introduce
the in-situ SEOP 3He neutron spin filter into the instruments of the pulsed neutron beam facility of JPARC, it is important to make the system compact
and stable, because the system is located inside
thick and bulky radiation shields for high energy
gamma rays and neutrons. In this study, we havedeveloped a compact magnetostatic cavity with adouble layered permalloy shield and solenoid coils
and a compact laser optics system with a volume
holographic grating (VHG) element for the SEOP
system.
Figures 1 and 2 show the developed magnetostatic cavity and its drawing. The magnetic cavity iscomposed of a magnetic shield and field coils. The
outer dimensions of the cavity are 272 mm in diameter and 364 mm in length. The magnetic shield ismade of Permalloy plates with a thickness of 2 mm,
and it has a double-layered structure. The main coilhas dimensions of 220 mm in diameter and 300 mm

Figure 2. The developed magnetostatic cavity.

72

Facility Research and Development Highlights

in length, and it is 560 turn-Cu wire. Two compensation coils with 24 turns are located at both edges
to realize homogeneous magnetic field distribution.
Two 36 turn-side coils with size of 120 mm in diameter and 20 mm in length are equipped at both ends
to transport neutron adiabatically.
We calculated the magnetic field distribution
generated inside the cavity. The field strength at thecenter position is 2.339 mT and ∆B⊥ /B0 ≤ 5.34cm−1.
This corresponds to the 3He relaxation time of ~200
hours. Moreover, the cavity can keep the magnetic
field homogeneity which leads to sufficiently long3
He relaxation time, over 100 hours, under the existence of an external field of 3.5 mT.

To make the in-situ SEOP system compact andstable, we also developed a compact laser optics
system with a volume holographic grating (VHG)
element. Its schematic layout is shown in Fig. 3.
The output laser power is 30 W, and the laser spectrum width is 0.35 nm. The laser emitting diode iscooled by an air cooling system with a peltier element, and we don’t use cooling water in this laser
optics, so that we can easily install this system into
the neutron beam instrument and operate it stably.
We have done the 3He polarization test by using thislaser optics based on the SEOP, and observed that3
He nuclear spin is polarized by the NMR technique.

Figure 3. The developed Schmatic layout of the new laser optics.

References[1]	L. D. Cussen, D. J. Goossens and T.J. Hicks,
NIM-A 440, 409-420 (2000).
[2]	C. G. Shull and J. S. Smart, Phys. Rev. 76,
1256 (1949).

[3]	R. N. Sinclair and B. N. Brockhouse, Phys.
Rev. 120, 1638 (1960).
[4]	H. Kira, Y. Sakaguchi, T. Oku et al., J. Physics:
Conference Seiese 294, 012014 (2011).

T. Oku1, H. Kira2, K. Sakai3, T. Shinohara1, Y. Sakaguchi2, T. Ino1,4, Y. Arimoto4, K. Ohoyama5, H. Hiraka5, L.J. Chang6,
M. Nakamura1, J. Suzuki2, H.M. Shimizu7, M. Arai8, Y. Endo4, and K. Kakurai91
Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Neutron R&D Division, CROSS-Tokai; 3Neutron Source Section, Materials and Life Science Division, J-PARC Center; 4Institute of Materials Structure Science, KEK; 5Institute for Material Research,
Tohoku University; 6Nuclear Science and Technology Center, National Tsing Hua University; 7Graduate School of Science, Nagoya University
8
Materials and Life Science Division, J-PARC Center; 9Quantum Beam Science Directorate, JAEA

Facility Research and Development Highlights

73

Status of the Muon Kicker System at D-line

Introduction
The double pulse proton beam from the J-PARC
3GeV Rapid Cycling Synchrotron (RCS) hits themuon production target in the Materials and Life
Science Facility (MLF), and produces muon pulses.
The muon pulses are then transported through the
decay muon line to two experimental areas (D1 and
D2). A kicker system is used to separate the muon
pulses and feed them to each experimental area simultaneously. The kicker system was installed asshown in Figure 1 in the summer of 2011. A beam
operation with the kicker system started in the winter of 2011. Dividing the single pulse beam was successful, but anti-noise measures were required.

Measure to reduce the kicker noise
When the kicker is excited, noises of 10MHz appear in the detector signals as shown in Figure 2.
Later, however, the kicker noise level was dramatically improved through the ground line of the kicker
system that was separated from the other earth lines.
Figure 3 shows μe-decay count rates with kicker on/
off. In the case of kicker-on, the noise level was improved after refining the ground line. However, further
improvements are required when Multi Pixel Photon
Counters (MPPC) will be used to replace the standard
photomultiplier counters of the DW1 spectrometer.
Measures to reduce the electrical noise from the
kicker are trial-and-error processes in parallel with the

Figure 1. Kicker system in the decay muon line.

Figure 2. Typical kicker noise in a μe-decay counter.

Figure 3. μe-decay spectra with kicker on/off.

74

Facility Research and Development Highlightsimprovements of the ground line. Some noise sourceswere overlaid with copper sheets as shown in Figure
4. The effect in the D2 area was confirmed with a radio
wave detector. The results are shown in Figure 5.

Summary
A kicker system was installed to separate thedouble-pulsed muon beams in the summer of 2011.
The kicker system directed the two single-pulsed
muon beams to the two existing experimental areas
D1 and D2 simultaneously in March 2012. Experimental studies with the spectrometer in D1 area became possible with kicker-on, but the kicker noiselevel is still high according to the S/N ratio of somedetectors.
Further measures to reduce the kicker noise arein progress for the beam operation in the autumn of2012.

Figure 4. Trial-and-error for noise reduction measures.

References[1] H. Fujimori et al., KEK-MSL Report 2010, 10[2]	P. Strasser, H. Fujimori et al., New Muon
Kicker System for the Decay Muon Beamline
at J-PARC, Proceedings of the International
Conference on Muon Spin Rotation, Relaxation
and Resonance (μSR2011), May 16-20, 2011,
Cancun, Mexico[3]	H. Fujimori et al., Proceedings of the 8th Annual
Meeting of Particle Accelerator Society ofJapan, August 1-3, 2011, Tsukuba, Japan

Figure 5. The noise distribution surrounding D2 area.

H. Fujimori1,2, Y. Irie2,3, K.M. Kojima1,2, T. Nagatomo1,2, S. Sakata4, M. Meguro4, N. Kurosawa4, P. Strasser1,2, and Y. Miyake1,2Muon Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK; 3Accelerator
Laboratory, KEK; 4Nippon Advanced Technology Co. Ltd. (NAT)
1

Facility Research and Development Highlights75

Development of a Time Projection Chamber
for the Precision Neutron Lifetime Measurement

A time projection chamber (TPC) has been developed to measure the neutron lifetime at BL05 –the NOP beamline in MLF. The neutron plays an important role in the Big Bang nucleosynthesis (BBN).
The abundance of light elements in the universe isdirectly coupled with the neutron lifetime, and a better understanding of the BBN requires the precise
length of the neutron lifetime. The neutron lifetime
can be measured by identifying neutron decays inflight. At BL05, the decay electrons are tagged by
the TPC with the four dimensional position. The
TPC also measures deposit energy as low as 200
eV so that more than 99.9% of the decay electrons
are to be detected to minimize the systematic uncertainty regarding the tagging efficiency.
It is essential to strongly reduce the background
events. The TPC is surrounded by lead shielding,cosmic ray veto counters, and extra iron shielding.
In addition, the TPC itself is made of special synthetic plastic, polyether ether ketone, to minimize
the natural radioactive contamination. The innerwalls of the TPC are covered with neutron absorber,
6
Li enriched LiF tiles, to further reduce the background events caused by the gas-scattered neutrons. It is also crucial to know the accurate neutron flux. A small amount of 3He gas is added to the
TPC, and the neutron flux is measured by detecting
the neutron absorption reactions, 3He(n,p)3H. An
additional advantage of the process is that it unambiguously defines the neutron decay volume or thefiducial area of the TPC. The TPC can be normallyoperated under different gas pressures so that any
background events resulting from the interactionsof neutrons and the TPC gas can be statistically
identified and subtracted. The apparatus is essentially a reproduction of the neutron lifetime measurement by Kossakowski et. al. [1] with the useof recent advanced technologies – a high intensity
neutron source, a spin flip chopper, high-tech dataacquisition electronics, synthetic materials, precise
computer simulation, etc. After the disastrous earthquake hit northeastern Japan in March, 2011, JPARC had been shut down for almost a year. However, there was enough time to study and improve
the performance of the TPC as well as to develop
sophisticated analysis methods to minimize thesystematic uncertainties in the measurement. The
physics run will start in 2012.

Figure 1.	The time projection chamber for the precision
neutron lifetime measurement at BL05.

References[1]	R. Kossakowski, P. Grivot, P. Liaud, K.
Schreckenbach, G. Azuelos, Nucl. Phys. A503,(1989) 473.

T. Ino1,2
Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK

1

76

Facility Research and Development Highlights

What's new at the MLF ?

CROSS-Tokai

The Public Neutron Beam Facility at J-PARC MLF
Consistent with its longstanding policy of promoting open access to major publicly-funded researchfacilities, the Japanese government in July 2009 designated the accelerators (linac and 3 GeV proton synchrotron) and a proportion of beamlines at J-PARC
MLF that are used for the generation and experimental exploitation of neutron beams as the Public Neutron Beam Facility. under the terms of the so-called“Public Use Promotion” legislation (Figure 1).
The aim of the legislation is to advance scienceand technology through the effective promotion andoperation of general user access programs at designated large-scale research facilities. In practice,
this is achieved by attracting and supporting use by
researchers from a wide range of fields that spansfrom fundamental and applied research to industrial
applications.
The establishment of the Public Neutron Beam
Facility brings J-PARC MLF into line with the SPring-8- SACLA synchrotron radiation and XFEL facility andthe “K Computer” – a next-generation supercomput-

er project – where the “Public Use Promotion” legislation has already been successfully applied.
The Public Beamlines at J-PARC MLF
The MLF has capacity to accommodate up to 23
neutron beamlines around the present target station. There are currently thirteen neutron and two
muon beam instruments in operation and six newneutron instruments in commissioning or underconstruction. Of these, five beamlines – all built andowned by JAEA – are a part of the Public Neutron
Beam Facility and have been designated as Public
Beamlines (Figure 2).
The Public Beamlines cover a wide range ofneutron scattering techniques and research applications. Specifically, they are:
	BL01 4SEASONS - 4D-Space Access Neutron
Spectrometer	BL02 DNA - Biomolecular Dynamics Spectrometer	BL15 TAIKAN - Small and Wide Angle Neutron
Scattering Instrument

CROSS－Tokai Involvement at J-PARC
3GeV
Synchrotron

Hadron Exptl
Facility(Muon-Neutron)
Nuclear Transmutation
Exptl Facility (planned)

Materials & Life Science
Exptl Facility
Linac

Neutrino Exptl Facility

50GeV Synchrotron

Areas of J-PARC covered by the Promotion of Public Use legislation
Figure 1. The Public Neutron Beam Facility at J-PARC (Shown in red).

78

What's new at the MLF ?

BL02 DNA
BL01 4SEASONSBL18 SENJUBL17 SHARAKU
BL15 TAIKAN

Figure 2. Layout of the Public Beamlines in the MLF Experimental Hall.

	BL17 SHARAKU - Polarized Neutron Reflectometer	BL18 SENJU : Extreme Environment Single
Crystal Neutron Diffractometer
CROSS and the Public Beamlines
The “Public Use Promotion” legislation requiresthat the user program on the Public Beamlines be
managed and supported by an independent, thirdparty organization in preference to the original builder of these instruments (JAEA). This organization is
known as the “Registered Institution for Facility Use
Promotion” (Registered Institution).
CROSS submitted an application to be appointed as the Registered Institution for the Public
Beamlines at J-PARC to the Ministry of Education,
Culture, Sports, Science and Technology (MEXT) in
February 2011 and was formally confirmed in therole by the Minister the following month. Accordingly, CROSS commenced operations from its Tokai
offices within the Ibaraki Quantum Beam ResearchCenter building adjacent to the J-PARC site on the
1st of April 2011 and CROSS-Tokai was born.
The Relationship between CROSS-Tokai and
J-PARC Center
Although the Public Use Promotion legislation
stipulates that CROSS-Tokai must be independentof JAEA and KEK – the co-owners and operators of
J-PARC MLF – there is an inevitable and desirable
level of cooperation and collaboration that is driven

by the common objectives and interdependenceof CROSS-Tokai and J-PARC Center. Indeed, themost recent publication of the MEXT basic policy
governing the Public Neutron Beam Facility (February 2011) requires a level of cooperation between
the stakeholders that will yield high quality research
results while maintaining the support and confidenceof the Japanese public. Accordingly, CROSS-Tokai
is committed to operating in close collaboration with
JAEA and KEK and, at the same time, building research cooperation and personnel networks withrelated facilities – both domestic and international– local authorities and the wider community.
Figure 3 shows a schematic representation of
the operational and functional relationship between
CROSS-Tokai and JAEA.
The Role of CROSS-Tokai
As Registered Institution for the Public Beamlines at J-PARC MLF, CROSS has wide-ranging
responsibilities. Specific operational requirements
and organizational expectations are set out in the
Public Use Promotion legislation and associatedpolicy documents (See the CROSS-Tokai website
for details http://www.cross-tokai.jp/).
In practical terms, the core functions of CROSSTokai can be summarized as follows:	Proposal Selection and Beamtime Allocation on
the Public Beamlines•	Develop and administer a fair and open proposal submission and evaluation process that

What's new at the MLF ?

79

Government (MEXT)
Designated Advanced Large-Scale Research Facilities
SPring-8/SACLA (Harima)
K-Computer (Kobe)
JSNS/J-PARC (Tokai)“Registered Institution for
Facilities Use Promotion”

Builder/Owner

JAEA/J-PARC◇ Construction, Operation, Maintenance& Upgrade of Accelerators, Neutron
Target & Public Beamlines◇ Stable Supply of Neutron Beams

Demand from users

Cooperation◇ Review of Proposals on Public Beamlines◇ Selection of Contract Beamlines◇ User Support on Public Beamlines◇ Provision of Information and Specialist
Technical Advice◇ Outreach Activities

Specific
Submission of
Neutron Beam Facility
Proposals
at J-PARC

Selection
Committee

Open and Transparent
Review & Selectionof Proposals

International and Local Users
Universities, National Labs. Industry(Fundamental Research – Industrial Application）

Figure 3. The relationship between and respective functions of JAEA and CROSS-Tokai.

facilitates neutron-based experiments fromfundamental, applied and industrial research
fields•	Establish and coordinate the activities of theSelection Committee•	Provide mechanisms to promote and support
strategic research areas as identified throughgovernment policy and in response to changing national and international circumstances	User Support on the Public Beamlines•	Provide coordinated and user-oriented support to the experimental activity on the Public
Beamlines•	Provide beamline services and associated facilities that are responsive to user expectations
and reflect international best practice	Information Resource for Facility Users•	Build and maintain a website that serves toprovide information about:		 	Facility news and events		 	User program and other services		 	Beamline and support facility details
		 	Organizational and staff contact details
		 	Organizational, technical and research publications•	Provide specialist technical advice via Science

80

What's new at the MLF ?

Coordinators and other expert staff	Outreach and Facility Promotion•	Promote leading-edge research and publicize
outcomes via symposiums and online media•	Host and organize conferences, workshops
and seminars•	Produce and distribute promotional brochures,
pamphlets etc.
•	Enhance User Program – online systems,
modes of service delivery etc.
•	Proactively promote international conferences
and symposiums and present CROSS-Tokai
activities and the Public Beamlines in theseforums•	Support and promotion of science and technology related activity in the local area•	Strengthening Industry-Academia collaboration
	Contract Beamline Assessment and Selection•	Manage the assessment, selection and implementation of proposals to build beamlines put
forward by external organizations•	These activities to be undertaken in close cooperation with the government and facility owners within an equitable selection framework

President
Takayoshi
NISHITANI
Research Center for Neutron
Science and Technology(CROSS Tokai)
Director

Comprehensive Research
Organization for
Science and Society (CROSS)
Head OfficeYasuhiko FUJII

Science Coordinators
S
C
Masatoshi SATO
Yoshiaki FUKUSHIMA

Safety Division

Administration Division

Toshiyuki YAMASHITA

Yasuo SEISHI

Utilization Consulting andPromotion, Research
Development, Personnel
Training

Utilization Promotion Division
Tohru MATOBA/
Garry FORAN (Deputy)

Neutron R&D DivisionJun-ichi SUZUKI/
Ryoichi KAJIMOTO (Deputy)

General Affairs

ProposalManagement

Group BL01

Human Resources

International
RelationsGroup BL02

Finance & Contracts

Promotion ofIndustrial Use

Group BL15

Users Office(CROSS)Group BL17

Information Services
and Public Relations

Group BL18
Technical Support
Group

Figure 4. The CROSS-Tokai Organization Chart and Leadership Team.

The Activities of CROSS-Tokai in 2011
Overview
It is now one year since CROSS-Tokai commenced operations in support of the Public Beamlines at J-PARC MLF. It has been a year in which
great progress has been made: not only in recovering from the effects of the 11 March 2011 earthquake, but also in establishing and building thepresence of CROSS-Tokai at J-PARC.
The CROSS-Tokai team is now comprised of afull complement of 48 research and support staff
engaged in activities across the full scope of the
CROSS-Tokai mission (Figure 4).
During FY2011, the footprint of CROSS-Tokai in
the J-PARC precinct dramatically increased not onlyin terms of personnel, but also from the viewpointof supporting facilities and infrastructure. The hubof CROSS-Tokai’s activities outside the MLF Experimental Hall has been established in the IQBRC
Building – home to the J-PARC Center Users Office– with office space and user facilities being fitted
out and put into service progressively throughout
the year (See details below).
Key CROSS-Tokai activities and achievements in
FY2011 include:
User Support•	Now supporting user operations and ongo-

ing commissioning activities on the five Public
Beamlines with Neutron R&D team of 23 scientists, programmers, engineers and technicians•	User Facilities under construction in the IQBRC		 	User Experiment Preparation Laboratory I Hard Matter		 	User Experiment Preparation Laboratory –Soft Matter & Biomaterials		 	User Data Analysis Room		 	User Lounge		 	“Refresh Rooms”
Proposal Selection•	Established a framework and mechanism for
proposal selection on the Public Beamlines•	2011B Call for Proposals – July-Aug 2011•	2012A Call for Proposals – Nov-Dec 2011•	Supported the work of committees associatedwith proposal selection:		 	Selection Committee – Convened 13 Jul
2011, 14 Nov 2011 & 13 Mar 2012		 	Proposal Evaluation Committee & Expert
Panels – Convened 3-4 Nov 2011 & 29 Feb1 Mar 2012		 	CROSS Development Proposal Evaluation
Panel – Convened 17 Feb 2012		 	“Trial Use Access System” Task Force – Convened 31 Aug 2011, 10 Oct 2011 & 2 Feb 2012

What's new at the MLF ?

81

User Experiment Preparation
Laboratory I

User Experiment Preparation
Laboratory II

User Lounge

Refresh Rooms

User Data Analysis RoomFigure 5. CROSS-Tokai User Facilities in the IQBRC Building.

The 1st Selection Committee Meeting
13 Jul 2011

The 2nd Selection Committee Meeting
14 Nov 2011

The 3rd Selection Committee
13 Mar 2012

Figure 6. Scenes from the meetings of the Selection Committee in FY2011.

Outreach and Facility Promotion•	CROSSroads Workshop Series		 	CROSSroads Workshop on Strongly-Correlated Systems – Tokai, 17-18 Oct 2011		 	CROSSroads Workshop on SANS Researchat J-PARC MLF – Tokai, 14 Mar 2012•	CROSS Industry Seminars		 	NISSAN Motor Company – 21 Dec 2011		 	Toyota Central Laboratories – 23 Jan 2012•	Other Conferences, Symposiums andWorkshops		 	Workshop on Magnetic Structure Analysis
from Neutron Powder Diffraction – Tokyo, 9
Aug 2011

82

What's new at the MLF ?

		 	Workshop on Battery Materials – Tokyo, 17
Nov 2011†
		 	1st Asia-Oceania Conference on Neutron
Scattering (AOCNS) – Tsukuba, 20-24 Nov
2011†		 	Workshop on Advances in Neutron Science for the Study of Materials Anisotropy,
Strength and Deformation Properties – Tokyo, 29-30 Nov 2011†		 	1st CROSS-JASRI Workshop - New Opportunities for Neutrons and SR in Solar Battery
R&D – Tokyo, 16 Jan 2012†		 	3rd MLF Symposium – Tokai, 19-20 Jan
2012†

Figure 7. Scenes from the Trial Use Information Days
Tokyo, 8-9 Feb 2012.

Figure 8. Dr Kazuki Ohishi of CROSS-Tokai (second from left).
At his award presentation		 	Trial Use Information Days – Tokyo, 8-9 Feb
2012 (Figure 7)		 	Workshop on SANS Data Analysis – Osaka,
28-29 Feb 2012†			 † Co-hosted by CROSS-Tokai
Other Activities and Achievements•	Awards and Prizes		 	The Society of Materials Science, Japan Annual Activity Prize			Awarded to: Koji Kiriyama (CROSS-Tokai
Neutron R&D Division) – 25 Apr 2011		 	The Japanese Society for Neutron Science
Technology Award
			Awarded to: Ryoichi Kajimoto*, Mitsutaka
Nakamura, Yasuhiro Inamura, Takeshi Nakatani, Wataru Kambara, Tetsuya Yokoo
and Fumio Mizuno (* CROSS-Tokai Neutron
R&D Division) – Nov 2011		 	The Crystallographic Society of Japan Nishi-

kawa Prize			Awarded to: Yasuhiko Fujii (Director,
CROSS-Tokai) – Nov 2011			JAEA Chairman’s Award for Research andDevelopment
			Awarded to: Satoshi Koizumi, Youhei Nouda,
Daisuke Yamaguchi, Takayuki Oku, Jun-ichi
Suzuki* and Hiroki Iwase* (* CROSS-Tokai
Neutron R&D Division) – Nov 2011		 	The Iron and Steel Institute of Japan Research Publication Prize			Awarded to: Hisao Yasuhara, Kaoru Sato,
Tohji Yuki, Ohnuma Masato, Jun-ichi Suzuki* and Yo Tomota (* CROSS-Tokai Neutron
R&D Division) – 25 Mar 2012		 	The Society of Muon and Meson Science ofJapan Young Researcher Encouragement
Prize (Figure 8)			Awarded to: Kazuki Ohishi (CROSS Neutron
R&D Division) – 26 Mar 2012

What's new at the MLF ?

83

BL02: Si Crystal Analyzer near Backscattering TOF
Spectrometer DNA

Introduction
A Si crystal analyzer near backscattering TOF
spectrometer DNA was under construction andbeam commissioning in JFY2011. The instrumental
specifications for DNA are shown in Table 1.
Table 1. Instrumental specifications of DNA.
Items

Specification
Coupled Liquid H2 Moderator

Neutron source (NS)L1 (source-sample)

42 [m]

L2 (sample-analyzer)~ 2.3 [m]L3 (analyzer-detector)~2.0 [m]Pulse sharpening chopper (PS-chopper)

Figure 1.	The insertion of a super mirror guide into a metal
jacket. (October 22, 2011)

Max speed: 300Hz at ~7.5m from NS
Crystal Analyzer
Crystal and reflection index

Si(111)Si(311) in plan

Bragg angle of analyzers
Energy resolution~87.5 [deg.]~1.5 [meV]: Si(111)~12 [meV]: Si(111)without PS-chopper~5 [meV]: Si(311)0.07 < Q < 1.98 [A-1]: Si(111)Momentum range

0.60 < Q < 3.80 [A-1]: Si(311)
Scan energy range-25 < E < 45 [meV]:Single pulse scan around Ef-500 < E < 500 [meV]:
without PS-chopper in second frame(the plan as of the end of march 2012)

Figure 2.	The alignment works of super mirror guide in
BL02 beam line by laser tracker. (October 22,
2011)

This type spectrometer covers the area of the
micro-eV energy range in the Q-E space. Many users program will be expected in science field suchas biophysics, confined liquids, fast ionic conductors and so on.
Construction works in JFY2011
In JFY2011, main construction works were theinstallation of super mirror guides, vacuum chamber, analyzer crystal units and detector amplifier
units as shown in the following photos.

84

What's new at the MLF ?

Figure 3.	The delivery of the DNA vacuum chamber. (September 30, 2011)

Figure 4.	The installation of the DNA vacuum chamber.
(October 13, 2011)

Figure 5.	The installation of analyzer crystal units. (January
06, 2012)

Results of Beam Commissioning in JFY2011
The commissioning has been started from the
beginning of February 2012. In this period, thepulse sharpening high speed chopper could not
be operated, then we operated DNA spectrometer
without the pulse sharpening chopper at energy
resolution dE~12meV. Figure 7 shows the comparison in the measurements of tunneling spectrum
between BL14 and BL02. The level of background
was found to be of the same order between two
spectrometers.

Figure 7.	A comparison the measurements of tunnel spectrum for 4-Methylpyridine N-oxide powder between BL14 and BL02.

Schedule in JFY2012
The user program will start form 2012A period.
And the commissioning with pulse sharpening
chopper will start form the autumn of 2012.
References[1]	N. Takahashi, et al., Journal of Physics andChemistry of Solids 68, 2199-2203 (2007).
Figure 6.	The installation of analyzer crystal units and detector amplifier units. (March 02, 2012)

K. Shibata1, N. Takahashi2, Y. Kawakita2, K. Kamazawa1, T. Yamada1, K. Nakajima2, W. Kambara2, Y. Inamura2,
T. Nakatani2, K. Soyama3, K. Oikawa4, N. Hosoya2, T. Iwahashi2, Y. Ito2, H. Tanaka2 , K. Aizawa2, M. Arai5, and S. Fujiwara6
1
Neutron R&D Division, CROSS-Tokai; 2Neutron Science Section, Materials and Life Science Division, J-PARC Center; 3Neutron Instrumentation
Section, Materials and Life Science Division, J-PARC Center; 4Neutron Source Section, Materials and Life Science Division, J-PARC Center;
5
Materials and Life Science Division, J-PARC Center; 6Quantum Beam Science Directorate, JAEA

What's new at the MLF ?

85

Development of BL09 SPICA

East Japan Earthquake
The Great East Japan Earthquake hit the eastarea of Japan at 14:46 JST on March 11, 2011. At JPARC the earthquake was felt at level 6 of the seismic intensity scale. The BL09 annex building moved
to the north by 3 cm and to the west by 7 cm, andsubsided by 10 cm. Fortunately, the construction of
SPICA had not been started yet at the time whenthe quake occurred.
Design concept of SPICA
SPICA has been designed to be of high resolution and high intensity. This means the moderator
should be sharp enough (a decoupled-poisoned
moderator was chosen), the flight path should belong and the focusing guide should be incorporated. The flight path between the moderator and thesample position is L1 = 52 m. Since, according to
the simulation of the guide tube, the elliptical guideshows an excellent performance over a wide rangeof wavelengths, we adopted the elliptical super-mirrors guide tube to keep high intensity at the sample
position. Figure 1 shows the calculated map of theneutron intensity distribution at the sample position.

(a)

(b)

Figure 1.	Schematic diagram of the elliptic supermirrors in
the guide tube of SPICA (a) and the neutron intensity distribution map at the sample position (b).

SPICA was designed to consist of three detector banks: the backward detector bank (150-175º),
the multipurpose detector bank (13-140º) and thesmall angle detector bank (1-25º). The distance L2

86

What's new at the MLF ?

from the sample to the detectors is about 2 m forall banks. To cover this large detector area, about
1600 one-dimensional 3He position-sensitive detectors (60 cm in length and half inch in diameter) areused.
Construction of SPICA
The photographs of the construction of thebeamline and its shieldings are shown in Fig. 2.
In Fig. 2(a), we look in the direction of the neutron
target from SPICA and Fig. 2(b) indicates the view
from the upper stream of the neutron source.

(a)

(b)

Figure 2.	The BL09 beamline line with the elliptical supermirrors. The Fig. 2(a) is the view from SPICA and(b) is the view from the neutron target.

The beamline and the SPICA instrument areshielded with neutron shielding concrete. The shield
optimization with new novel neutron shielding concrete was performed to reduce the skyshine dose
rate of neutron and γ-ray radiations instead of a conventional shield configuration of iron, polyethylene
and B4C resin.
First beam at SPICA
On February 8, 2011, we detected the first neutron beam at the position of 1 m away from the end of
the guide tube. Fig. 4 indicates the detected neutron
beam without and with silhouette characters madeof cadmium sheets, and the group photographs.

As shown in Fig. 5, the homogeneities of neutron beam intensities along the line A-B (horizontal
direction) and C-D (vertical direction) are in fair condition, which means considerable good efficiencyof the guide tube equipped with the elliptical supermirors.

Figure 3. The shield of SPICA diffractometer at BL09.

A

B

C

D

Figure 5. The homogeneity of neutron beam (see text).

(a)

(b)

(c)

(d)

Figure 4.	The neutron beam imaging and group photographs. The silhouette shown in (b) (RISINGSPICA) was made of cadmium foil.

M. Yonemura1,2, T. Kamiyama1,2, M. Nagao1,2, Y. Onodera3, S. Torii1,2, M. Kawai1,2, K. Mori3, and T. Fukunaga3
1
Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK; 3Research
Reactor Institute, Kyoto University

What's new at the MLF ?

87

BL11: Completion of High Pressure Neutron
Diffractometer PLANETPLANET is a powder diffractometer designed
specifically for high-pressure experiments. This
year started with checking the damage to the beamline caused by the earthquake. Then, we repaired it
and continued the construction.
In March 2012, we finished the construction
and the commissioning started. Here, we introduce
these issues in the above order.
The evaluation of the incident beam
Due to the robust design of the beamline, we
did not see any substantial damage to the beamline
devices. The only substantial effect was the inclination of the experimental hall and the resulting shiftof the super-mirror guide from its original position.
Figure 1 shows the shift of the center of the mirror components at each section. To check the effects on the incident beam nature, we measured thespatial distribution and the beam flux at the sample
position. Figure 2 shows the difference of the beam
center from the designed position. The beam center deviated by 1.5 mm in the upward and 1.5 mm

toward the BL12 side. The beam flux was estimatedfrom the radioactivation of the Au foil placed at the
sample position. The beam flux within the area of
10 mmf amounted to 98% of the designed value,
while that within the area of 3 mmf showed a worse
correspondence.
Construction of the beamline
We installed two components which are the key tothe success of this beamline. The one is the 90 deg.
detector bank equipped with foldable neutron shielding panels and the radial collimator alignment system. In spite of the complex mechanism in folding thepanels, the detector bank system worked well.

Figure 2.	Shift of the beam center (hole in Cd) from the designed position (red cross).

Figure 1.	Shift of the center position of the supermirror ateach section.

88

What's new at the MLF ?

Figure 3.	Detector banks with the foldable shielding panels
and the alignment system for radial collimators.

Figure 4. The 6-axis multi-anvil press “ATSUHIME” installed in the experimental hutch.

Figure 5.	Pressure generation curve of the multi-anvilpress when using the WC anvils and ZrO2 pressure transmitting medium.

The second one is the 6-axis multi-anvil press
which was installed on Feb. 29, (see Fig.4). Figure
5 shows the results of the high-pressure generation test. By using a pressure transmitting medium

with the size of 17 mm cube, we can approach thepressure of 7.7 GPa (Bi III-V transition). This result
indicates that we can conduct high-pressure neutron experiments at 10 GPa using a relatively large
sample with a volume of 21 mm3.
The construction of the hardware has been almost finished, and now we are installing the software. The commissioning will be finished in thespring of 2012, and the PLANET will be used byproject members in the next autumn. The beamline
will be opened for general users after JFY 2013.
This project is supported by Grant-in-Aid for
Creative Scientific Research (19GS0205) from theJapan Society for Promotion of Science and Grantin-Aid for Scientific Research on Innovative Areas(No. 20103001) from the Ministry of Education,
Culture, Sports, Science and Technology (MEXT)
of Japan.

T. Hattori1,2, A. Sano1,2, H. Arima3, A. Yamada4 W. Utsumi1,2, H. Kagi5, and T. Yagi4
1
Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Quantum Beam Science Directorate, JAEA; 3Institute forMaterial Research, Tohoku University; 4Geodynamics Research Center, Ehime Univ; 5Graduate School of Science, The University of Tokyo

What's new at the MLF ?

89

Development and Commissioning of TAIKAN

The small and wide angle neutron scattering instrument TAIKAN (BL15) restarted beam operation
on January 24, 2012 following repair and upgrading
after the Great East Japan Earthquake, which occurred on March 11, 2011. TAIKAN was developed
more than on March 8, 2011, which was the firstday of beam operation. But the greatest change occurred in the staff. TAIKAN was registered as one of
public beamlines under the legislation for the “Promotion of Public Utilization of Specific Advanced
Large Research Facilities” in 2011 and a new staff of
CROSS-Tokai joined the group of TAIKAN. The staffof the J-PARC center and CROSS-Tokai shown in
Fig. 1 has engaged in user support and research
activities at TAIKAN.

Figure 3 shows the small-angle and the middleangle detector banks. The minimum q value, qmin,reaches 1.5 nm-1 with the small-angle detectors
and the neutron wavelength of 0.78 nm. At the central part of the small-angle detector bank there isa square area without 3He PSD tubes. The size ofthe area is about 200 mmH×200 mmW. In the rear of
this area 32 short 3He PSD tubes and a high resolution 2D detector will be installed as small-angle andan ultra-small-angle detector to make qmin smaller
down to 5×10-3 nm-1.

Figure 2. A 3D image of TAIKAN.

Figure 1.	A souvenir picture taken on the day of restarting
the beam operation.

Figure 2 shows a 3D image of TAIKAN. TAIKAN is composed of a set of components: opticaldevices, 4 choppers, a sample stage, a vacuum
chamber, and 5 detector banks. On the small-angle
and the middle-angle detector banks in the vacuum
scattering chamber, 632 and 136 3He PSD tubes
with 8 mm in diameter and about 0.6 MPa in 3Hegas pressure have been installed, respectively. On
the high-angle detector bank in the atmosphere 104
3
He PSD tubes have been installed.

90

What's new at the MLF ?

Figure 3. A small-angle and a middle-angle detector banks.

A sample changer was provided. 10-sample set
in sample holders can be mounted simultaneously on the sample changer. The temperature of thesamples can be controlled between -25 and 125 oC.
The sample changer is set on a sample stage with
4-axes (x, y, Rx, Ry(=ω)) goniometer, where the zaxis is defined as it is parallel to the beam axis.
The characteristics of TAIKAN were evaluatedwith a neutron beam. Figures 4 and 5 show scattering profiles obtained for standard samples of silver
behenate and glassy carbon with the small-angle
detector bank, respectively. The beam sizes of thesamples of silver behenate and glassy carbon are 12
mm×12 mm and 10 mm×10 mm, respectively. The
neutron wavelength used in data analysis is from0.07 to 0.76 nm. For the sample of silver behenate
5 diffraction peaks were observed clearly as shownin Fig. 4. The full width at half maximum of the firstdiffraction peak is 0.084 nm-1. The ratio of this value
and the q value of the peak center (q=1.08 nm-1)
is 0.078, even when the scattering profile obtainedwith short neutron wavelength is included in data
analysis. For the sample of glassy carbon Guinier
region and Porod region were observed clearly as
shown in Fig. 5. A Guinier radius Rg obtained withthis scattering profile is 0.69 nm. On the figure an
USAXS profile measured by Dr. Ilavsky, who kindly
provided us with the sample, of APS is also plottedin arbitrary unit. It was confirmed that the SANS profile almost agreed with the USAXS profile.

Figure 4. A scattering profile of silver behenate.

Figure 5. Scattering profiles of glassy carbon.

J. Suzuki1, S. Takata2, T. Shinohara2, T. Oku2, T. Tominaga2, T. Nakatani2, Y. Inamura2, K. Suzuya2, K. Aizawa2, M. Arai3,
T. Otomo2,4, K. Ohishi1, H. Iwase1, T. Ito1, and M. Sugiyama5
1
Neutron R&D Division, CROSS-Tokai; 2Neutron Science Section, Materials and Life Science Division, J-PARC Center; 3Materials and Life
Science Division, J-PARC Center; 4Institute of Materials Structure Science, KEK; 5Research Reactor Institute, Kyoto University

What's new at the MLF ?

91

Polarized Neutron Reflectometer SHARAKU
Started User Program

Neutron reflectometry has been widely recognized as an indispensable tool to analyze structuresof nanomaterials which have layered structure. In
such layered structure, there is existence of interfaces between different materials where new physical phenomena are expected to emerge. This isvery important for nanotechnology because it has
a close relation to the practical devices. SHARAKU
was installed at BL17 as the second neutron reflectometer of MLF reflecting that situation.
SHARAKU was designed to routinely use polarized neutrons while the first neutron reflectometer of
MLF, SOFIA, is dedicated to the free surface and interface investigation. Therefore targets of SHARAKU
are solid thin films, especially magnetic thin films,
and films which contain hydrogenous materials. The
hydrogen in the latter sample sometimes causes
dominant incoherent scattering. The polarized neutron technique can remove the incoherent scattering
background in the neutron reflectivity measurements.
The installation of SHARAKU was almost complete when the earthquake struck in March last year
(2011). SHARAKU itself was not seriously damagedby the earthquake. However, we had to do someextra work. We reconstructed a part of the biological shield, and realigned the beam line components

such as choppers, beam slits, a polarizer, and so on.
The first neutron beam was introduced to SHARAKU at the end of this January, and we started thecommissioning. Typical unpolarized neutron reflectivities are shown in Figs. 1 and 2.
Figure 1 shows unpolarized neutron reflectivity
curves from a Ni thin film on a Si substrate. An example of a reflectivity profile of a multilayer sample
is shown in Fig. 2. The sample is 20 stacks of a Ni/Tibilayer on a Si substrate. The designed thickness ofboth Ni and Ti layer is 5.0 nm. The clear total reflection is observed in the lower-q region, and the fringes
appear in the middle-q region in both figures. Bragg
peaks from the periodic bilayer of Ni/Ti are seen in
addition to the fringes in the data of the multilayer.
A neutron polarizer of SHARAKU consists of
4Qc Fe/Si polarizing supermirrors which align withdouble-transmission geometry. A stack of the same
4Qc Fe/Si polarizing supermirrors are used for the
analyzer. The mirrors are horizontally stacked with asingle-reflection geometry in this case. Spin flippers
are two-coil Drabkin flippers.
Figure 3 shows the wavelength dependenceof the flipping ratios. The maximum flipping ratio is130, and it linearly decreases with the increase of
the wavelength. There is no additional fine structure.

Figure 1.	Unpolarized neutron reflectivity of a Ni thin film on a Si substrate. Experimental data are plotted by “+”,and the best fitting curve is drawn by a solid line.

92

What's new at the MLF ?

Figure 2.	Unpolarized neutron reflectivity of a [Ni(5nm)/Ti(5nm)] ×20 multilayer on a Si substrate. Experimental
data are plotted by “+”, and the best fitting curve is drawn by a solid line.

It enables us to do a simple data correction. We did
not evaluate the flipping efficiencies of the two-coilflippers, but this graph shows that they work properly.
In the end of fiscal year 2011, SHARAKU was
ready to use although the reflectometer was still at acommissioning stage. We started the user programin the 2011B MLF operation. We are waiting for yourproposals and are looking forward to seeing you in
the BL17 cabin.

Figure 3.	The wavelength dependence of flipping ratio using the polarizer and the analyzer of SHARAKU.

References[1]	M. Takeda et al., Chinese J. Phys. 50, (2012)
161.

M. Takeda1,2, D. Yamazaki2,3, K. Soyama2,3, R. Maruyama3, H. Hayashida3, H. Asaoka1,2, T. Yamazaki2, K. Aizawa1,
M. Arai1, Y. Inamura1, T. Itoh1, W. Kambara1, K. Kaneko1,2, T. Nakamura3, T. Nakatani1, K. Oikawa4, T. Ohhara5,
K. Sakasai3, T. Shinohara1, K. Suzuya1, N. Takahashi1, S. Takata1, I. Tamura6, K. Toh3, H. Yamagishi3, T. Hirano7,
N. Yoshida5, Y. Sakaguchi5, M. Mizusawa5, J. Suzuki5, J. Sato5, and K. Kiriyama5
1
Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Quantum Beam Science Directorate, JAEA; 3Neutron
Instrumentation Section, Materials and Life Science Division, J-PARC Center; 4Neutron Source Section, Materials and Life Science Division,
J-PARC Center; 5Neutron R&D Division, CROSS-Tokai; 6Department of Research Reactor and Tandem Accelerator, JAEA; 7Hitachi ResearchLaboratory, Hitachi Ltd., Hitachi

What's new at the MLF ?

93

Commissioning of BL18 SENJUSENJU is a new TOF single-crystal neutron diffractometer. SENJU is designed for precise crystal
and magnetic structure analyses under multiple
extreme environments such as low-temperature,high-pressure and high-magnetic field. SENJU is
also designed for taking diffraction measurement ofsmall single crystals less than 1.0mm3 in volume.
The commissioning of SENJU had been scheduled to begin in April 2011 but was delayed due tosevere damage to the instrument shield causedby the earthquake of March 11, 2011. The SENJU
instrument team (Fig. 1) spent one year to deconstruct the beamline, repair damaged components,
and rebuild the instrument.
On March 5, 2012, the first neutron beam wasdelivered to the sample position. Subsequently, the2-dimensional detectors, goniometers, sample environment equipment and the device control software
were tested and conditioned. At the same time, dif-

Figure 1. The SENJU instrument team.

fraction images of several organic and inorganic
single crystals such as NaCl, 12CaO·7Al2O3 (Fig.
2), glycine and sucrose were measured at room
temperature (RT). In these measurements, Braggreflections in the high-Q region (d-spacing < 0.5 Å)
were successfully observed in some organic and inorganic crystals.
In the case of a 1 x 1 x 1 mm3 size NaCl crystal,intensity data were acquired with a duration time of
7.5 hours. The calculated unit cell parameters fromthe positions of the observed Bragg reflections (a= 5.640(2) Å, b = 5.660(6) Å, c = 5.643(8) Å, a =90.2(2)º, b = 89.95(5) º, g = 90.09(5)º) coincided
well with the expected values (a = b = c = 5.64 Å,
a = b = g = 90º). The total of 88 Bragg reflections
were recorded and used in the structural analysis.
The final R-factor was R = 3.25% and the obtained
parameters well agreed with the previously reported
ones.
Bragg reflections were also successfully observed from a small, laboratory X-ray size single
crystal of NaCl (0.3 x 0.3 x 0.1 mm3) with a 50 hour
exposure time at 200 kW beam power. This result
suggests that the structural analyses of laboratory X-ray size crystals using neutron diffraction on
SENJU should become feasible when the J-PARC
accelerators achieve 1MW.
The data processing procedure has also beendeveloped and tested. The successful structural
analysis of a 1 mm3 NaCl crystal at SENJU as described above indicates that both the data meas-

Figure 2. The diffraction image of a 12CaO•7Al2O3 single crystal measured at SENJU.

94

What's new at the MLF ?

urement and processing procedure at SENJU arereliable.
A commissioning of a 4K cryostat for SENJU
was also started. Inside the cryostat, a small piezoelectric motor based fixed-c type two-axis goniometer, rotatable at low temperature, is attached to acold finger. By optimizing the wiring of the motors,
a base temperature of 3.0 K at the top of the go-niometer was achieved within a 3-hour cool downfrom RT. The first low-temperature experiment using the cryostat was carried out on TbCoGa5 whichshows an antiferromagnetic order below 35 K [1]
The measurement at 50 K and 10 K reveals thatmagnetic Bragg reflections derived from the ordering with q=(1/2 0 1/2) were clearly observed at 10 K
(Fig. 3).

Figure 3. The (h k 0.5) plane of TbCoGa5 at 50 K (left) and 10 K (right) measured on SENJU. Magnetic Bragg reflections derived
from antiferromagnetic ordering is clearly observed at 10 K.
(the sample was provided by Suzuki group, Yokohama National University.)

Reference[1]	R. Watanuki et al.: J. Phys. Soc. Jpn. 80 (2011)
SA083.

T. Ohhara1, R. Kiyanagi2, T. Kawasaki2, K. Oikawa3, I. Tamura4, K. Kaneko2,5, A. Nakao1, T. Hanashima1, and K. Munakata1
Neutron R&D Division, CROSS-Tokai; 2Neutron Science Section, Materials and Life Science Division, J-PARC Center; 3Neutron Source Section, Materials and Life Science Division, J-PARC Center; 4Department of Research Reactor and Tandem Accelerator, JAEA; 5Quantum Beam
Science Directorate, JAEA
1

What's new at the MLF ?

95

TAKUMI at BL19

Damages from the earthquake & recovery
TAKUMI suffered significant damages from thebig earthquake on March 11; the satellite building
sank by about 15 cm, the beam line shields at thejoint part between the main building and the satellite building were tilted and 4 m of the neutron
guides parts, including the supporting parts inside
the shields, were broken. The bolts used to fix thealignment positions of the detector frames werealso broken and the frames hit the sample table, but
fortunately both the detectors and the sample tablethemselves were saved. The broken neutron guides
are shown in Figure 1. To recover TAKUMI, all parts,
including the spectrometer shields, were removed,
the sunken satellite building was jacked-up, the broken parts were repaired and/or repurchased, andall parts were reinstalled as they were at the timeof the construction. The recovery of the main partof TAKUMI finished at the end of February 2012,
while the reinstallation of the sample environments
is still to be continued. TAKUMI was managed by
Kazuya Aizawa and Stefanus Harjo as instrument
scientists, Jun Abe as a postdoc and Takaaki Iwahashi as an engineer (not full time) during FY 2011.
Re-commissioning
TAKUMI finally started its re-commissioning on
March 6th, 2012. Figure 2 shows the main spectrometer in which all of the main parts have been reinstalled, being in the same condition as before theearthquake on March 11. TAKUMI is now ready forexperiments. In Figure 3 (top), K. Aizawa is starting
the shutter operation of TAKUMI’s first beam after
the recovery, and the direct beam image observedby neutron camera is shown in Figure 3 (bottom).
TAKUMI’s sample table and detector positions,chopper parameters, detector parameters, TOF to
d-spacing conversion parameter, 2 mm gauge definition radial collimator setting parameter, and othercalibration parameters, had been fixed during its
commissioning.

96

What's new at the MLF ?

Figure 1.	Lattice strain evolution during tensile deformationof A2024 alloy

Figure 2.	TAKUMI spectrometer room after the recovery(back to its normal condition)

Figure 3.	Shutter operation for the first beam for re-commissioning (top), and the direct beam image observed by neutron camera (bottom).

The commissioning of TAKUMI has not been finished yet, but strain mapping measurements and insitu measurements during loading at RT, has been
ready to be conducted. Residual strain mapping teston shrink-fit ring & plug of Al alloy has been conducted using a prototype VAMAS sample made in house.
The sample used for the measurement is shown in
Figure 4 (top), and the results in Figure 4 (bottom).
Gauge volumes of 2×2×10 mm3 and 2×2×2 mm3
were used for the hoop/radial strain components andaxial strain component, respectively. The d0 measurement was not done, but the strain distributions
can be seen from the lattice parameter distributions.
Hoop and radial components for the same positions
were measured at different -90 and +90 deg scattering detector banks to test our setting conditions of
the sample table, radial collimators and detector arrangement. As seen in Figure 4 (bottom), both hoop
and radial strain components are well reproducibly
measured at different detector banks. The threestrain components also show good balance.

Figure 4. Shrink-fit ring & plug of Al alloy(top), and lattice
parameter distributions with respect to the radial
position (bottom).

Figure 5.	Lattice strain – nominal stress curves obtained
during tensile test of alu-minum (A2024) alloy.

A dog bone flat specimen made by aluminum(A2024) alloy was prepared and in situ measurements during tensile deformation were conducted.
Strain gauges were glued to the specimen to monitor macroscopic strains. Several stress steps wereapplied for the elastic region. Figure 5 shows theresults of lattice strains plotted with respect to theapplied stress. The average lattice strains werein good agreements with the macroscopic strains
measured from the strain gauges, showing that thestrain accuracy for tensile deformation done at TAKUMI was very good. Moreover, the anisotropy ofdiffraction elastic constant is also very clearly observed.
User programs
There were many proposals that have been approved to be done at TAKUMI for 2011A. Since TAKUMI and J-PARC were not able to conduct them,several have been transferred to SNS (VULCAN)
and ISIS (ENGIN-X). For that, we express our appreciation to the scientists of both instruments.

S. Harjo, K. Aizawa, J. Abe, and T. Iwahashi
Neutron Science Section, Materials and Life Science Division, J-PARC Center

What's new at the MLF ?

97

Radiation Shield of U-Line

The U-line construction was started in this fiscal
year. A part of the beam line shield was settled in
the 2nd experimental hall toward the complete of Uline construction in the summer of 2012 to provide
the ultra slow muon beam from the autumn.
A radiation shield was designed along the established strategy [1]. Namely, we developed a technique to use Monte-Carlo simulation to take measures against the complicated facility structure. The
simulated result was fed back to the deice design,and the revised one was simulated again. The feedback procedure was repeated until obtaining a design satisfying all requirements. Both the accumulated dose and the heat generation are evaluatedby a Monte-Carlo code, PHITS [2]. In the simulation, protons are created just upstream of the muontarget with a practical emittance, and then protons

and secondary particles originating from nuclear
reactions are transported. For safety reasons, we
multiplied the simulated result by the margin factor of two, and the radiation dose was required tobe below the design limit at the boundary between
the controlled area and the public area, which wasintroduced in the J-PARC site. We optimized theamount, the arrangement and the material of the radiation shield. For this purpose, using Monte-Carlosimulation is suitable because of the flexibility ofmodeling.
Figure 1 shows the determined shield layout tobe submitted to MEXT for operation from the autumn
of 2011. D1 area was also modified for the future extension of U-line. In this case, the radiation dose was
evaluated as shown in Fig. 2. In comparison with Dline, U-line has a large beamline aperture, and thus

Figure 1. The shield layout in the 2nd experimental hall submitted to MEXT in FY2011.

98

What's new at the MLF ?

Figure 2. A typical evaluated result of radiation dose assuming the shield layout shown in Fig. 1.

Figure 3. A photo taken after the installation of the shield blocks.

the effect of streaming neutrons becomes serious.
To stop these neutrons, a temporary shield block
was settled at the exit of U-line. This shield block
will be removed in the installation of the beamline
magnets.
The installation work of the shield blocks wascompleted in December 2011, just before restarting the accelerator operation after the disaster inMarch. In January 2012, the settlement of shieldblocks for the extension of U-line, i.e. ultra-slow
muon beamline, was started. Due to the space

limitation, temporal movement of shield blocks will
become difficult after the completion of U-line, andthus well-considered maintenance scenario will be
required.
References[1]	N. Kawamura et al. 2009 Nucl. Inst. and Meth.
A 600 114.
[2]	H. Iwase, K. Niita, T. Nakamura 2002 J. Nucl.
Sci. Technol. 39 1142.
[3]	K. Niita et al. 2006 Radiat. Meas. 41 1080.

N. Kawamura1,2, and Muon Sci. Sec., J-PARC
1
Muon Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK

What's new at the MLF ?

99

Status of the Superomega Muon Beamline

The Superomega muon beamline is now being installed on U-line in experimental hall No.2of the Materials and Life Science Facility (MLF) in
J-PARC. The U-line is the second muon beamlineof MLF/J-PARC, and the Superomega muon beamline is the muon extraction and transportation partof U-line. The features of Superomega are a largesolid angle acceptance and simultaneous extractionof the both positive and negative muons, and all of
its beamline magnets consist of solenoids. The firstgoal of the Superomega is the surface muon source
for the ultra-slow muon beam, which is energy tunable low energy muon beam for a variety of experiments, such as surface-interface magnetism, andmuon g-2 measurement.
The Superomega muon beamline consists ofthree parts, the normal-conducting capture solenoid,
the superconducting curved transport solenoid, andthe axial focusing solenoid. At present, the capturesolenoid had been already installed in March 2009.
The fabrication of the curved transport solenoid andthe axial focusing solenoid is already completed.
And they all will be installed in the summer of 2012.

The design of the superconducting transport solenoid was described previously [1]. Here, we focus
on the design and concept of the axial focusing solenoid. The axial focusing solenoid is installed on
the downstream of the curved transport solenoid.
The axial focusing solenoid consists of five beamline vacuum chambers and six warm bore cryostats.
Each cryostat has two thin solenoids, which can be
individually applied to the current to transport andfocus the muon beam onto the experimental target. The axial focusing solenoid is cooled down by
thermal conducting method using a 1.5-W GiffordMcMahon (GM) refrigerator.
The various functions, which are muon beam
blocker, three stage Wien-filter type positron separators, and muon beam slits, are added on thebeamline chambers. To avoid radiation exposure in
the experimental area, the beam blocker is inserted
into the muon beamline for stopping the muons andany other particles. The electrodes of the positron
separators have 30-cm gap, 75-cm length and 50cm width. They can be applied ±400 kV by using
Cockroft-Walton type high voltage power supplies

Figure 1.	Picture of the vacuum chamber of the positron separator and the cryostats of the superconducting coilsof the axial focusing solenoid.

100

What's new at the MLF ?

Figure 2. Picture of the axial focusing solenoid.

directory set on the beamline chamber, to eliminate
almost all positrons from the muon beam, which are
simultaneously transported with the muon.
The beam transportation and trajectories of axial
focusing solenoid were calculated using a GEANT4based simulation package called G4Beamline [2].
According to the simulations, the 2 x 108 muons/s
can be focused on to the final experimental target(70 x 50 mm) placed on the 700-mm downstreamof the last focusing solenoid. This indicates that theSuperomega muon beamline will be the highest in-tensity pulsed muon source in the world. The firstbeam extraction experiment of Superomega beamline will be conducted in October 2012.

References[1]	Y. Makida et al., IEEE TRANSACTIONS ON
APPLIED SUPERCONDUCTIVITY, 21, (2011)1725.
[2]	Muons, Inc. 552 Nm Batavia Avenue, Batavia,
IL, available at http://www.muonsinc.com.

Y. Ikedo1,2 Y. Miyake1,2, K. Shimomura1,2, P. Strasser1,2, K. Nishiyama1,2, N. Kawamura1,2, H. Fujimori1,2, S. Makimura1,2,
A. Koda1,2, Y. Kobayashi1,2, T. Nagatomo1,2, J. Nakamura1,2, T. Ogitsu2, Y. Makida2, T. Adachi3, M. Yoshida2, H. Ohhata2,
T. Okamura2, A. Yamamoto2, T. Nakamoto2, K. Sasaki2, W. Higemoto1,4, and K. Ishida5
1
Muon Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, KEK; 3School of
Science, University of Tokyo; 4Advanced Science Research Center, JAEA; 5Nishina Center, RIKEN

What's new at the MLF ?

101

Facility ReportBeam Operation Status at MLF
February 11th and 12th, the beam was stopped formodification of the neutron beam lines. From the
5th of March, Run #41 has started. In Run #41, theuser operation was terminated on March 22nd 2012,
due to the failure of the high voltage power supply(HVPS) for the LINAC, which was fixed on April 9th
2012. As a result of problems with the HVPS, whichcaused low availability in Run # 41, 9 days of beamschedule had been cancelled.

After remarkably quick recovery from thedamage caused by the great earthquake, theproton beam was introduced to the target on
December 22 nd 2011 as scheduled. After only
one shot of the beam, it could be confirmed thatit reached the mercury target. After the tuningof the proton beam, the beam operation forusers restarted on January 24 th 2012. In order
to confirm the status of the target facilities, wedelivered proton beam with power of 120 kW,
which was smaller than the one used before thegreat earthquake. The beam power has been
increased gradually. Since March 15th 2012, proton
beam with power of 220 kW is being delivered tothe target. The level of availability has reachedmore than 90%, as shown in Table 1, during Run# 40 performed from January to February. On

Table 1. Run cycle, scheduled time and availability.

Run#

Scheduled Time (h).

Availability

40

549

94.3

41

547

57.7

500

1000
Beam Power[kW]2012/6

2012/6

2012/5

2012/4

2012/3

2012/20
2012/20
2011/2100
2011/1250
2010/12200

2010/11100

2010/6300

2010/11150

2010/5400

2010/4200

2010/1500

2009/12250

2009/11600

2009/10300

2009/2700

2009/6350

2008/9800

2009/1400

Accumulated Beam Power [MWh]900

Accumulated Beam Power䛆MWh䛇

2008/5

Beam Power [kW]450

Figure 1. Beam power trend at MLF and cumulative beam power from the first beam to the summer 2012.

104

Facility Report㻶㻲㼅 2011 㻦㻌㻶㻙㻼㻭㻾㻯㻌㼛㼜㼑㼞㼍㼠㼕㼛㼚㻌㼜㼘㼍㼚㻌㼍㼚㼐㻌㼞㼑㼟㼡㼘㼠㻰㼑㼏㼑㼙㼎㼑㼞

㻝

Linac
RCS
MLF
MLF result
MR

㻞

㻟

㻲㼑㼎㼞㼡㼍㼞㼥

Linac
RCS
MLF
MLF resultMR
MR cycle

㻹㼍㼞㼏㼔

Linac
RCS
MLF
MLF resultMR
MR cycle

㻡

㻢

㻣

㻤

㻥 㻝㻜 㻝㻝 㻝㻞 㻝㻟 㻝㻠 㻝㻡 㻝㻢 㻝㻣 㻝㻤 㻝㻥 㻞㻜 㻞㻝 㻞㻞 㻞㻟 㻞㻠 㻞㻡 㻞㻢 㻞㻣 㻞㻤 㻞㻥 㻟㻜 㻟㻝

Run#39㻶㼍㼚㼡㼍㼞㼥
Linac
RCS
MLF
MLF resultMR
MR cycle

㻠

㻝

㻞

㻟

㻠

㻡

㻢

㻣

㻤

㻥 㻝㻜 㻝㻝 㻝㻞 㻝㻟 㻝㻠 㻝㻡 㻝㻢 㻝㻣 㻝㻤 㻝㻥 㻞㻜 㻞㻝 㻞㻞 㻞㻟 㻞㻠 㻞㻡 㻞㻢 㻞㻣 㻞㻤 㻞㻥 㻟㻜 㻟㻝

Run#40
㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻝

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻝

㻝

㻝

㻜㻚㻡

㻜㻚㻡

㻲 㻲 㻲 㻲 㻲 㻲 䕦㼟㼡㼞㼢㼑㼥㻥 㻝㻜 㻝㻝 㻝㻞 㻝㻟 㻝㻠 㻝㻡 㻝㻢 㻝㻣 㻝㻤 㻝㻥 㻞㻜 㻞㻝 㻞㻞 㻞㻟 㻞㻠 㻞㻡 㻞㻢 㻞㻣 㻞㻤 㻞㻥

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻞

㻟

㻠

㻡

㻢

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻣

㻝

㻝

㻝

㻝
㻜㻚㻡

㻤

㻝

㻝

㻿

㻿

㻿

㻿

Run#41㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿 㻿㻝 㻞 㻟 㻠 㻡 㻢 㻣 㻤 㻥 㻝㻜 㻝㻝 㻝㻞 㻝㻟 㻝㻠 㻝㻡 㻝㻢 㻝㻣 㻝㻤 㻝㻥 㻞㻜 㻞㻝 㻞㻞 㻞㻟 㻞㻠 㻞㻡 㻞㻢 㻞㻣 㻞㻤 㻞㻥 㻟㻜 㻟㻝

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻝

㻝

㻝

㻝

㻝

㻝

㻜㻚㻡

㻝

㻝

㻝

㻝

㻝

㻝

㻜㻚㻡

㻜㻚㻡

㻜㻚㻡

㻝

㻝

㻝

㻝

㻝

㻝

㻝

㻜㻚㻡

㻝

㻝

㻝

㻝

㻝

㻝

㻜㻚㻡

㻲

㻲

㻹㼑㼚㼠㼑㼚㼍㼏㼑

㻲

㻲

㻜㻚㻡

㻲
㻝

㻜㻚㻡

㻜㻚㻡

㻲

㻜㻚㻡

㻲

㻹㻸㻲㻌㼡㼟㼑㼞㻌㼞㼡㼚㻜㻚㻡㼐㻌㼛㼜㼑㼞㼍㼠㼕㼛㼚

㻝

㻲

㻝

㻲

㻝

㻲
㻝

㻜㻚㻡

㻝

㻲

㻝

㻲

㻹㻾㻌㼡㼟㼑㼞㻌㼞㼡㼚㻜㻚㻡㼐㻌㼛㼜㼑㼞㼍㼠㼕㼛㼚

㻝

㻲

㻜㻚㻡

㻲

㻝

㻲

㻝

㻲

㻝

㻲

㻝

㻲

㻝

㻲

㻝

㻝

㻝

㻝

㻝

㻝

㻜㻚㻡

㻝

㻝

㻝

㻝

㻝

㻯㼍㼚㼏㼑㼘㼘㼑㼐㻌㼐㼡㼑㻌㼠㼛㻌㼠㼔㼑㻌㼒㼍㼕㼘㼡㼞㼑㻌㼛㼒㻌㻸㻵㻺㻭㻯㻌㻴㼂㻼㻿

㻝

㻲

㻝

㻲

㻝

㻲

㻝

㻲

㻝

㻲

㻝

㻲

㻝

㻲

㻜㻚㻡

㻲

㻝

㻲

㻲

㼀㼡㼚㼕㼚㼓㻒㻿㼠㼡㼐㼥㻮㼑㼍㼙㻌㼛㼜㼑㼞㼍㼠㼕㼛㼚㻌㼍㼠㻌㼍㼏㼏㼘㼑㼞㼍㼠㼛㼞

Figure 2.	Scheduled plan and actual results for the beam operation in JFY2011 at J-PARC. Unfortunately, due to the failure of thehigh voltage power supply for the LINAC, the beam operation was cancelled after March 22nd 2012.

Facility Report105Users at MLF
In FY2010, the number of users at MLF (both forneutron and muon experiments) tripled comparedto FY2008 when we officially started the user program. At that time, the operation power was 200 kW
of proton beam, and 6 neutron beam lines (instruments) and 2 muon beam ports were available forthe research program. In FY2011, in contrast, a big
decrease of the number of users was caused by theearthquake on March 11th. Until the end of FY2011,

refurbishment works were done on the accelerator, beamline systems, instruments, and buildings
to provide proper facilities for scientific research. It
is greatly expected that the number of users will increase again in the next year. The number of users
in the period of fiscal year are summarized in Table
and Figure for domestic and foreign users of neutron and muon experimental facilities.

Table. The number of domestic and foreign users in the period of fiscal year

FY2008Domestic
Users
NeutronMuon

FY2009Foreign
Users

Domestic
Users

182
161

Domestic
Users

378
21

353

12
12

FY2010Foreign
Users
25

55

Domestic
Users

529
485

57
0

FY2011

Foreign
Users

222
44

198

55
2

48

7

28

Neutron (foreign users)

Muon (domestic users)

Neutron (domestic users)

600
450
300
150
2009
FY 2
009
9

0
FY 20
010
2010

FY 20
2011
011

Figure. The number of domestic and foreign users in the period of fiscal year

106

Facility Report

2430

Muon (foreign users)

FY 20088

ForeignUsers

2Muon Program
Advisory Comm.

Muon Science
Proposal Rev. Comm.

Contract Beamlines
Only

Unified
Access Point

Task Forces(CROSS)

Registered
Ins tu on

Proposal
Evalua on Comm.

Public Beamlines Only

ALL Proposals submi ed via the J-PARC Users Office

Neutron Science Proposals

Public Beamlines Only
JAEA Research
CROSS Development
Proposal Advisory Proposal Evalua on
Commiee
Panel
Joint Mee ng

Joint Mee ng

Neutron Science
Proposal Rev. Comm.

All except Public
Beamlines

All except Public Beamlines
Neutron Program
Advisory
Commiee

Neutron Instrument
Proposals

Joint Mee ng

Neutron Instrument Contract Beamline
Proposal Rev. Comm. Evalua on Comm.

All except Contract
Beamlines

Selec onCommiee

Director
CROSS-TokaiMLF Advisory
Board

Collabora on
Commi eePresident
CROSS

Public Beamlines Only

Director
J-PARC

President
JAEA

All except Public Beamlines

Muon Science Proposals

Muon
Instrument
Proposals

Muon Instrument
Proposal Rev. Comm.

(JAEA/KEK)

J-PARC
CenterDirector General
KEK

The JAEA-KEK-CROSS Agreement of Coopera on on the Promo on of Public U liza onof the Specific Neutron Beam Facili es at J-PARC (Enacted on 1 April 2011)

Proposal Review System

Facility Report107

MLF Proposals Summary – FY2011
Table 1. Breakdown of Proposal Numbers for the 2011A & 2011B Rounds
Beamline

Instrument

BL01

4D-Space Access Neutron Spectrometer 4SEASONS

BL02

Biomolecular Dynamics Spectrometer - DNA

BL15
BL16

0

1

1

0

1

3

0

1

1

0

1

1

10

2

1

0

1

3

0

1

0

0

0

0

0

0

1

16

0

3

9

0

0

4

0

0

4

0

Accurate Neutron-Nucleus Reaction Measurement
Instrument - ANNRI

0

1

0

0

1

0

4

0

1

4

1

0

Neutron Optics and Physics - NOP

0

1

0

0

1

0

0

1

0

0

1

0

16

1

0

12

1

0

4

1

0

4

1

0

10

3

1

10

3

1

5

3

1

5

3

1

4

1

0

2

1

0

1

1

0

1

1

0

13

3

1

8

3

1

3

3

1

2

3

1

7

0

1

4

0

1

6

1

0

6

1

0

5

0

1

2

0

1

BL05

BL14

1

2

4

BL04

BL12

14

(100-β)Ibaraki Biological Crystal
Diffractometer - iBIX

BL10

2011B
Submitted
Approved
GU PU/S IU GU PU/S IU

(β)†

BL03

BL08

‡

2011A
Submitted
Approved
GU PU/S IU GU PU/S IUSuper High Resolution Powder Diffractometer-S-HRPD
Neutron Beamline for Observation and Research
Use - NOBORUHigh Resolution Chopper Spectrometer- HRC
Cold-neutron Disk-chopper Spectrometer- AMATERAS
Small and Wide Angle Neutron Scattering
Instrument - TAIKAN
High-Performance Neutron Reflectometer with a
Horizontal Sample Geometry - SOFIA

BL17

Polarized Neutron Reflectometer - SHARAKU

BL19Engineering Diffractometer - TAKUMI

10

1

0

10

1

0

20

2

1

18

2

1

4

2

1

2

2

1

(100-β)‡

11

0

0

7

0

0

6

0

0

6

0

0

BL20

Ibaraki Materials Design
Diffractometer - iMATERIA

(β)†

17

18

0

17

18

0

10

5

0

10

5

0

BL21

High Intensity Total Diffractometer - NOVA

1

1

0

1

1

0

0

1

0

0

1

0

D1

Muon D1

15

1

1

9

1

1

5

1

1

4

1

1

D2

Muon D2

5

0

1

5

0

1

4

0

1

4

0

1

141

51

7

115

44

7

68

23

10

56

24

9

Subtotal
Total

199

166

101

GU : General Use		
PU : Project Use or Ibaraki Pref. Project Use
IU : Instrument Group Use† : Ibaraki Pref. Exclusive Use Beamtime (β = 80% in FY2011)
S : S-type Proposals‡ : J-PARC Center General Use Beamtime (( 100-β = 20% in FY2011 )Proposals

200
150
100
50
0

21

21

150

159

33

16
34
67
2008

4
124

90

166

12
89

2009A 2009B 2010A 2010B 2011A 2011B
Proposal Round
Figure 1. MLF Proposal Numbers over Time108

Facility Report

Not Approved
Approved

89

Table 2. Principal Investigator Affiliations in FY2011

Universities(Japan)

JAEA

Companies(Japan)KEK

Foreign
Organizations

Research Institutes(Japan)

111

73

56

26

21

13

Foreign
Organizaons
7%
KEK
9%

ResearchInstutes(Japan)
4%
Universies(Japan)

Universies(Japan)37%

Companies(Japan)
19%

JAEA
Companies (Japan)

JAEA
24%

KEK
Foreign Organizaons
Research Instutes (Japan)

Figure 2. Origin of Proposals in FY2011

Table 3. Proposals by Sub-committee/Expert Panel – FY2011

Sub-committee
Expert Panel

P1

P2

P3

P4

P5

P6

P7

P8

Q1

Q2

No. of Proposals

53

11

13

7

32

5

23

9

11

18

Q1
6%
P8
5%

Q2
10%

P7
13%
P5
17%

3%

P1
29%
P3
7%
P4
4%

P2
6%

P1 : Crystallography
P2 : Liquid and Amorphous Materials
P3 : Nanomaterials
P4 : Biomaterials
P5 : Magnetism and Strongly-Correlated Systems
P6 : Fundamental Physics
P7 : Industrial Applications
P8 : Research and Development
Q1: Magnetic and Strongly Correlated Electronic Materials
Q2 : Chemical Physics and General Science

Figure 3. Submitted Proposals by Sub-committee/Expert Panel – FY2011

Facility Report

109

MLF Division Staff 2011
Director
Vice Director		

Masatoshi Arai (JAEA)
Hideki Seto (KEK)
Takashi Kato (JAEA)

Neutron Source Section
Leader
Sub-Leader
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		

JAEA
Masatoshi Futakawa
Hiroshi Takada
Fujio Maekawa
Shinichi Sakamoto
Katsuhiro Haga
Shinichiro Meigo
Sakai Kenji
Yoshimi Kasugai
Makoto Teshigawara
Tomokazu Aso
Hidetaka Kinoshita
Kenichi Oikawa
Masahide Harada
Shoichi Hasegawa
Hiroyuki Kogawa
Takasi Wakui
Tetsuya Kai
Masakazu Seki
Akihiko Watanabe

		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		

Akira Ogawa
Kiichi Ohtsu
Toshiaki Uehara
Kiyomi Ikezaki
Kohei Hanano
Hideki Tatsumoto
Motoki Ohi
Yoshihiko Kawakami
Manabu Ito
Hisashi Sakurayama
Takeshi Naoe
Atsushi Akutsu
Toru Suzuki
Masato Ida
Kenichi Kanomata
Tatsuhiro Nakajima
Hiroki Matsui
Shizuka Yoshinari
Chieko Higuchi

Neutron Science Section
Leader
		
		
		
		
		
		
		
		
		
		
		
		
		

110

Facility Report

KEK
Takashi Kamiyama
Susumu Ikeda
Toshiya Otomo
Tetsuya Yokoo
Norifumi Yamada
Shuki Torii
Tomohiro Seya
Masataka Sakaguchi
Zhang Junrong
Koichiro Sadakane
Hirohiko Shimizu
Shinichi Ito
Takashi Ino
Setsuo Satoh

		
		
		
		
		

Hidenori Sagehashi
Suguru Muto
Naokatsu Kaneko
Masao Yonemura
Miki Nagao

Sub-Leader
		
		
		
		
		
		

JAEA
Kazuya Aizawa
Kentarao Suzuya
Kenji Nakajima
Takayuki Oku
Mitsutaka Nakamura
Stefanus Harjo
Takeshi Nakatani

		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		

Shinichi Takata
Nobuaki Takahashi
Takenao Shinohara
Yukinobu Kawakita
Seiko Kawamura
Hiroshi Arima
Yasuhiro Inamura
Hiroshi Kira
Tatsuya Kikuchi
Takuro Kawasaki
Jun AbeTaiki Tominaga
Hirotaka Sato
Fumio Mizuno
Hironori Shimakura
Hiroki Ueno
Yuhua Su
Wu Gong
Hiromichi Tanaka
Wataru Kambara
Yukihiro Ito

		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		

Takaaki Iwahashi
Tomonori Hosoya
Yasuhiro Yamauchi
Kentaro Moriyama
Masayasu Takeda
Toyotaka Osakabe
Kazuo Kurihara
Wataru Utsumi
Shuichi Wakimoto
Takanori Hattori
Itaru Tamura
Koji Kaneko
Asami Sano
Hideo Harada
Atsushi Kimura
Hidehito Asaoka
Masato Kubota
Chiho Tobe
Naoko Shimizu
Junko Akutsu

		
		
		
		
		
		

Hirotoshi Hayashida
Hideshi Yamagishi
Satoru Okayasu
Takuro Sakai
Ryo Yasuda
Mana Hirayama

		
		
		
		
		

Kusuo Nishiyama
Yutaka Ikedo
Tetsuya Masuda
Jumpei Nakamura
Toyofusa Yoshimura

		
		
		

JAEA
Wataru Higemoto
Takashi Ito
Kazuhiko Ninomiya

Neutron Instrumentation Section
Leader
		
		
		
		
		

JAEA
Kazuhiko Soyama
Kaoru Sakasai
Dai Yamazaki
Kentaro Toh
Tatsuya Nakamura
Ryuji Maruyama

Muon Section
Leader
		
		
		
		
		
		
		
		
		
		

KEK
Yasuhiro Miyake
Ryosuke Kadono
Koichiro Shimomura
Kenji Kojima
Patrick Strasser
Naritoshi Kawamura
Akihiro Koda
Hiroshi Fujimori
Shunsuke Makimura
Yasuhisa Nemoto
Yasuo Kobayashi

Facility Report111

CROSS-Tokai Staff 2011
Director

Yasuhiko Fujii

Science Coordinators		

Masatoshi Sato		

Yoshiaki Fukushima

		
		
		
		
		
		
		
		
		
		
		
		
		
		

Takayasu Hanashima
Koji Munakata
Koji Kiriyama
Takayoshi Ito
Yukihiko Kawamura
Hiroshi Kira
Motoyuki Ishikado
Kazuhiro Akutsu
Makoto Kobayashi
Akifumi Kishi
Tadashi Futagami
Kaoru Sato
Junichi Sato
Satoshi Kasai

		
		
		
		
		

Megumi Kawakami
Aya Yamada
Katsumi Kunigihara
Asami Inoue
Emi Takaha

		
		
		

Tomoyuki Yabana
Mutsumi Shiraishi
Mika Gunji

Neutron R&D Division
Head
Head (Deputy)
		
		
		
		
		
		
		
		
		
		
		
		

Jun-ichi Suzuki
Ryoichi Kajimoto
Sungdae Ji
Kazuhiko Ikeuchi
Kaoru Shibata
Kazuya Kamazawa
Takeshi Yamada
Kazuki Ohishi
Hiroki Iwase
Tazuko Mizusawa
Yoshifumi Sakaguchi
Noboru Yoshida
Takashi Ohhara
Akiko Nakao

Health and Safety Division		Toshiyuki Yamashita

Utilization Promotion Division
Head
Head (Deputy)
		
		
		
		

Tohru Matoba
Garry ForanToshiki Asai
Rei Ohuchi
Junko Ohta
Shin-ichi Yamaguchi

Admin and Finance Division
Head
Head (Deputy)		112

Facility Report

Yasuo Seishi
Masaru Yokoyama
Takahiro Koizumi

Committee and Meetings
Materials and Life Science Facility Advisory Board
物質・生命科学実験施設利用委員会
Masatoshi AraiJapan Atomic Energy Agency, Japan
Yasuhiko Fujii
Comprehensive Research Organization for Science and Society, Japan
Toshiharu Fukunaga
Kyoto University, Japan
Masatoshi Futakawa
Japan Atomic Energy Agency, Japan
Makoto Hayashi
Ibaraki Prefecture, Japan
Mitsuhiro Hirai
Gunma University, Japan
Yujiro Ikeda
Japan Atomic Energy Agency, Japan
Susumu Ikeda
High Energy Accelerator Research Organization, Japan
Kazuaki Iwasa
Tohoku University, Japan
Masahiko Iwasaki
RIKEN, Japan
Ryosuke KadonoHigh Energy Accelerator Research Organization, Japan
Kazuhisa Kakurai
Japan Atomic Energy Agency, Japan
Shinichi Kamei
Mitsubishi Research Institute, Inc., Japan
Takashi Kamiyama
High Energy Accelerator Research Organization, Japan
Toshiji Kanaya (Chair)
Kyoto University, Japan
Takashi KatoJapan Atomic Energy Agency, Japan
Youji Koike
Tohoku University, Japan
Yasuhiro Miyake
High Energy Accelerator Research Organization, Japan
Junichirou Mizuki
Japan Atomic Energy Agency, Japan
Toshiya Otomo
High Energy Accelerator Research Organization, Japan
Hideki Seto
High Energy Accelerator Research Organization, Japan
Mitsuhiro Shibayama
University of Tokyo, JapanJun Sugiyama
Toyota Central R&D Labs., Inc., Japan
Eiko Torikai
University of Yamanashi, Japan
Kazuyoshi Yamada
Tohoku University, Japan

Neutron Instrument Proposal Review Committee
中性子実験装置部会
Masatoshi Arai
Koichiro Asahi
Muneyuki Imafuku
Takashi Kamiyama
Takashi Kato
Hideaki Kitazawa
Yoshiaki Kiyanagi (Chair)
Yukio Morii
Yukio Morimoto
Kenji Nakajima
Toshiya Otomo
Kenji Ohoyama

Japan Atomic Energy Agency, JapanTokyo Institute of Technology, JapanTokyo City University, Japan
High Energy Accelerator Research Organization, Japan
Japan Atomic Energy Agency, Japan
National Institute for Material Science, Japan
Hokkaido University, Japan
Ibaraki Prefecture, Japan
Kyoto University, Japan
Japan Atomic Energy Agency, Japan
High Energy Accelerator Research Organization, Japan
Tohoku University, Japan

Facility Report113

Mamoru Sato
Hideki Seto
Junichi Suzuki
Naoya Torikai
Hideki Yoshizawa

Yokohama City University, Japan
High Energy Accelerator Research Organization, Japan
Comprehensive Research Organization for Science and Society, Japan
Mie University, Japan
University of Tokyo, Japan

Neutron Science Proposal Review Committee
中性子課題審査部会
Yoshiaki Akiniwa
Masatoshi Arai
Takahisa Arima
Sung-Min Choi
Hideto En’yo
Toshiharu Fukunaga
Makoto Hayashi
Susumu Ikeda
Kazuhisa Kakurai
Takashi Kamiyama
Toshiji Kanaya
Takashi Kato
Brendan Kennedy
Yoshiaki Kiyanagi
Yasuhiro Miyake
Yukio Morii
Yukio Noda
Yuji Ohashi
Je-Geun Park
Mamoru Sato
Hideki Seto
Mitsuhiro Shibayama (Chair)
Junichi Suzuki
Peter Timmins
Yo Tomota
Xun-Li Wang
Kazuyoshi Yamada
Hideki Yoshizawa

Yokohama National University, Japan
Japan Atomic Energy Agency, Japan
University of Tokyo, Japan
Korea Advanced Institute of Science and Technology, Korea
RIKEN, Japan
Kyoto University, Japan
Ibaraki Prefecture, Japan
High Energy Accelerator Research Organization, Japan
Japan Atomic Energy Agency, Japan
High Energy Accelerator Research Organization, Japan
Kyoto University, Japan
Japan Atomic Energy Agency, Japan
University of Sydney, Australia
Hokkaido University, Japan
High Energy Accelerator Research Organization, Japan
Ibaraki Prefecture, Japan
Tohoku University, Japan
Ibaraki Prefecture, Japan
Seoul National University, Korea
Yokohama city University, Japan
High Energy Accelerator Research Organization, Japan
University of Tokyo, Japan
Comprehensive Research Organization for Science and Society, Japan
Institut Laue-Langevin, France
Ibaraki University, JapanOak Ridge National Laboratory, U.S.A
Tohoku University, Japan
University of Tokyo, Japan

JAEA Research Proposal Advisory Committee
J-PARC物質・生命科学実験施設におけるJAEA研究課題諮問委員会
Masatoshi AraiJapan Atomic Energy Agency, Japan
Toshiharu Fukunaga
Kyoto University, Japan
Mitsuhiro Hirai
Gunma University, Japan
Yujiro Ikeda
Japan Atomic Energy Agency, Japan

114

Facility ReportMasayuki Imai
Toshiji Kanaya
Yuji Kawabata
Yukinobu Kawakita
Hideaki Kitazawa
Yoshiaki Kiyanagi
Michiyasu Mori
Yoichi Murakami
Kenji Nakajima
Tsuneyoshi Nakayama (Chair)
Hiroyuki Oigawa
Taku Sato
Hideki Seto
Shinichi Shamoto
Hirohiko Shimizu
Junichi Suzuki
Keisuke Tanaka
Yo Tomota
Eiko Torikai
Kazuyoshi Yamada

Ochanomizu University, Japan
Kyoto University, Japan
Kyoto University, Japan
Japan Atomic Energy Agency, Japan
National Institute for Material Science, Japan
Hokkaido University, Japan
Japan Atomic Energy Agency, Japan
High Energy Accelerator Research Organization, Japan
Japan Atomic Energy Agency, Japan
Hokkaido University, Japan
Japan Atomic Energy Agency, Japan
University of Tokyo, Japan
High Energy Accelerator Research Organization, Japan
Japan Atomic Energy Agency, Japan
Nagoya University, Japan
Comprehensive Research Organization for Science and Society, Japan
Meijo University, Japan
Ibaraki University, Japan
University of Yamanashi, Japan
Tohoku University, Japan

Neutron Program Advisory Committee
中性子共同利用実験審査委員会
Koichiro Asahi
Yasushi Idemoto
Susumu Ikeda
Shinichi Itoh
Kazuaki Iwasa
Ryosuke Kadono
Hiroshi Kageyama
Hiroyuki Kagi
Takashi Kamiyama
Toshiji Kanaya
Mikio Kataoka
Nomura Masaharu
Yutaka Moritomo
Youichi Murakami
Toshiya Otomo
Hideki Seto (Chair)
Hirohiko Shimizu
Masaaki Sugiyama
Junichi Suzuki
Noboru Yamamto
Osamu Yamamuro
Kiyanagi Yoshiaki

Tokyo Institute of Technology, JapanTokyo University of Science, Japan
High Energy Accelerator Research Organization, Japan
High Energy Accelerator Research Organization, Japan
Tohoku University, Japan
High Energy Accelerator Research Organization, Japan
Kyoto University, Japan
University of Tokyo, Japan
High Energy Accelerator Research Organization, Japan
Kyoto University, Japan
Nara Institute of Science and Technology
High Energy Accelerator Research Organization, Japan
University of Tsukuba, Japan
High Energy Accelerator Research Organization, Japan
High Energy Accelerator Research Organization, Japan
High Energy Accelerator Research Organization, Japan
High Energy Accelerator Research Organization, Japan
Kyoto University, Japan
Comprehensive Research Organization for Science and Society, Japan
High Energy Accelerator Research Organization, Japan
University of Tokyo, Japan
Hokkaido University, Japan

Facility Report

115Muon Instrument Proposal Review Committee
ミュオン実験装置部会
Masatoshi Arai
Koichiro Asahi (Chair)
Wataru Higemoto
Masahiko Iwasaki
Ryosuke Kadono
Takashi Kato
Kenji Kojima
Kenya Kubo
Yoshitaka Kuno
Yasuhiro Miyake
Nobuhiko Nishida
Hiroyuki Nojiri
Toru Ogitsu
Koichiro Shimomura
Yasunori Yamazaki

Japan Atomic Energy Agency, JapanTokyo Institute of Technology, Japan
Japan Atomic Energy Agency, JapanRIKEN, Japan
High Energy Accelerator Research Organization, Japan
Japan Atomic Energy Agency, Japan
High Energy Accelerator Research Organization, Japan
International Christian University, Japan
Osaka University, Japan
High Energy Accelerator Research Organization, JapanTokyo Institute of Technology, Japan
Tohoku University, Japan
High Energy Accelerator Research Organization, Japan
High Energy Accelerator Research Organization, JapanRIKEN, Japan

Muon Science Proposal Review Committee
ミュオン課題審査部会
Masatoshi Arai
Koichiro Asahi
Kim H. Chow
Roberto De Renzi
Wataru Higemoto
Katsuhiko Ishida
Kenji Ishida
Ryosuke Kadono
Shinsaku Kambe
Takashi Kamiyama
Hiroshi Kobori
Youji Koike (Chair)
Kenya Kubo
Yasuhiro Miyake
Yuichiro Nagame
Yasuo Nozue
Masao Ogata
Shinji Tsuneyuki
Soichi Wakatsuki

116

Facility ReportJapan Atomic Energy Agency, JapanTokyo Institute of Technology, Japan
University of Alberta, Canada
University of Parma, Italy
Japan Atomic Energy Agency, JapanRIKEN, Japan
Kyoto University, Japan
High Energy Accelerator Research Organization, Japan
Japan Atomic Energy Agency, Japan
High Energy Accelerator Research Organization, Japan
Chiba University, Japan
Tohoku University, Japan
International Christian University, Japan
High Energy Accelerator Research Organization, Japan
Japan Atomic Energy Agency, Japan
Osaka University, Japan
University of Tokyo, Japan
University of Tokyo, Japan
High Energy Accelerator Research Organization, JapanMuon Program Advisory Committee
ミュオン共同利用実験審査委員会
Hiroshi Amitsuka
Hokkaido University, Japan
Masaharu Aoki
Osaka University, Japan
Wataru Higemoto
Japan Atomic Energy Agency, Japan
Susumu Ikeda
High Energy Accelerator Research Organization, Japan
Katsuhiko Ishida
RIKEN, Japan
Kenji Ishida
Kyoto University, Japan
Kenji Itoh
High Energy Accelerator Research Organization, Japan
Ryosuke Kadono (Chair)High Energy Accelerator Research Organization, Japan
Shinsaku Kambe
Japan Atomic Energy Agency, Japan
Yoh Kobori
Chiba University, Japan
Tohoku University, Japan
Yoji Koike
Kenji Kojima
High Energy Accelerator Research Organization, Japan
Tadashi Koseki
High Energy Accelerator Research Organization, Japan
Kenya Kubo
International Christian University, Japan
Yasuyuki Matsuda
University of Tokyo, Japan
Yasuhiro Miyake
High Energy Accelerator Research Organization, Japan
Yuichro Nagame
Japan Atomic Energy Agency, Japan
Hironori Nakao
High Energy Accelerator Research Organization, Japan
Yasuo Nozue
Osaka University, Japan
Masao Ogata
University of Tokyo, Japan
Hideki Seto
High Energy Accelerator Research Organization, Japan
Atsushi Shinohara
Osaka University, Japan
Shinji Tsuneyuki
University of Tokyo, Japan

Selection Committee (CROSS)
選定委員会
Toshio Akai
Hidetoshi Fukuyama (Chair)
Makoto Hayashi
Kazuaki Iwasa
Shinichi Kamei
Toshiji Kanaya
Mikio Kataoka
Naoki Kishimoto
Tomoko Nakanishi
Kazumi Nishijima
Mitsuhiro Shibayama
Masaki Takada
Kiyoyuki Terakura
Eiko Torikai

Mitsubishi Rayon Co., Ltd., JapanTokyo University of Science, Japan
Ibaraki Prefecture, Japan
Tohoku University, Japan
Mitsubishi Research Institute Inc., Japan
Kyoto University, Japan
Nara Institute of Science and Technology, Japan
National Institute of Material Science, Japan
University of Tokyo, Japan
Mochida Pharmaceutical Co., Ltd., Japan
University of Tokyo, JapanRIKEN, Japan
Japan Advanced Institute of Science and Technology, Japan
University of Yamanashi, Japan

Facility Report117

Neutron Advisory Committee (NAC)
NAC-2012 convened 8-10 Feb 2012 at the IQBRC, Tokai
List of NAC-2012 Members
Kurt N. Clausen
John R. Haines
Toshiji Kanaya
Mahn Won Kim
Yoshiaki Kiyanagi
Dan A. Neumann
Robert Robinson
Uschi Steigenberger (Chair)
Werner Wagner

Paul Scherrer Institute, Switzerland
Oak Ridge National Laboratory, USA
Kyoto University, Japan
Korea Advanced Institute of Science and Technology, Korea
Hokkaido University, Japan
National Institute of Standards and Technology, USA
Australian Nuclear Science and Technology Organization, Australia
Science and Technology Facilities Council, UK
Paul Scherrer Institute, Switzerland

Group photo of NAC-2012

118

Facility ReportMuon Science Advisory Committee (MuSAC)
MuSAC-10 convened 17-18 Feb 2012 at the KEK Tokai Campus
List of MuSAC-10 Members
Jun Akimitsu
Hiroshi Amitsuka
Robert Cywinski
Elvezio Morenzoni (Chair)Jean-Michel Poutissou
Atsushi Shinohara
Jeff E. Sonier
Eiko Torikai

Aoyama-Gakuin University, Japan
Hokkaido University, Japan
University of Huddersfield, UK
Paul Scherrer Institute, Switzerland
TRIUMF, Canada
Osaka University, Japan
Simon Fraser University, Canada
University of Yamanashi, Japan

Group photo of MuSAC-10

Facility Report119The Government Review of J-PARC
Hiroaki Aihara
Hidetoshi Fukuyama (Chair)
Takaaki Kajita
Toshiji Kanaya
Michiyo Kaneko
Akio Komori
Noritaka Kumagai
Kazumi Nishijima
Kiyotaka Okada
Nobuyuki Osakabe
Hirokazu Tamura
Eiko Torikai
Yuriko Yamagata
Hiromi Yokoyama

University of Tokyo, JapanTokyo University of Science, Japan
University of Tokyo, Japan
Kyoto University, Japan
Toyota Motor Corporation, Japan
National Institutes of Natural Sciences, Japan
Japan Synchrotron Radiation Research Institute, Japan
Mochida Pharmaceutical Co., Ltd., Japan
National Institutes of Natural Sciences, Japan
Hitachi, Ltd., Japan
Tohoku University, Japan
University of Yamanashi, Japan
Kumamoto University, Japan
University of Tokyo, JapanThe Government started their review of J-PARC on March, 2012. The accomplishment of early recovery fromthe Great East Japan Earthquake was highly appreciated. The major focus of this review was to establish the
future five year plan. For Neutrons, the extensive efforts will be made to improve the environments for sample
preparations and data analyses. For Muons, the best effort for the coming five years for the Muon group will
be to fill up two beamlines, called S and H. The construction of a research building and an isotope storage
building were also discussed.

120

Facility ReportAward List
The AONSA Prize 2011For his pioneering development of acceleratorbased neutron sources and instrumentations,and his great contribution to the establishmentof neutron science community and finally to therealization of one of the most powerful pulsed
neutron scattering facility at J-PARC
The Asia-Oceania Neutron Scattering Association(AONSA)
Noboru Watanabe, November 2011
The JSNS Young Scientist Award
Neutron Diffraction Study on Hydrogen Bond in
Mineral in the Deep Earth
The Japanese Society for Neutron Science
Asami Sano-Furukawa, November 2011
The JSNS Young Scientist Award
Quantitative Imaging of Crystalline Structural
Information by Pulsed Neutron Transmission
The Japanese Society for Neutron Science
Hirotaka Sato, November 2011
The JSNS Technology Award
Development of High-efficient Inelastic Neutron
Scattering Method with Multiple Incident Energies
on a Chopper Spectrometer
The Japanese Society for Neutron Science
Ryoichi Kajimoto, Mitsutaka Nakamura, Yasuhiro
Inamura, Takeshi Nakatani, Wataru Kambara,
Tetsuya Yokoo, Fumio Mizuno, November 2011
The Awards of CrSJ, S. Nishikawa Award
Neutron and X-ray Scattering Study of Structure
and Dynamics of Condensed Matters
The Crystallographic Society of Japan
Yasuhiko Fujii, November 2011

平成 23 年度理事長表彰 研究開発功績賞（日本原子力研究開発機構）
物質階層構造のマルチスケール解析を目指した先端的中性子超小角散乱法の開発
小泉智、能田洋平、山口大輔、奥隆之、鈴木淳市、
岩瀬裕希
平成 23 年 10 月 1 日
日本鉄鋼協会俵論文賞
中性子小角散乱法による鉄鋼中ナノ析出物のサイズ評価
安原久雄、佐藤馨、田路勇樹、大沼正人、鈴木淳市、
友田陽
平成 23 年 3 月 25 日
日本中間子科学会若手奨励賞µ +SR 法による分子磁性体の磁気構造キラリティの研究
大石一城
平成 24 年 3 月 26 日
日本材料学会関東支部年間活動賞
桐山幸治
平成 23 年 4 月 25 日
日本非破壊検査協会第 19 回超音波による非破壊評
価シンポジウム 新進賞
Cavitation damage evaluation by nonlinear ultrasonictechnique万濤
平成 24 年 1 月 27 日
平成 23 年度日本結晶学会年会 ポスター賞
新しい粉末指数づけアルゴリズムとその実行結果について
富安亮子
2011 年 11 月 24 日
2011 年日本金属学会秋期大会 ポスター賞
中性子および X 線回折による超イオン伝導体 Li7 P 3 S 11 の
構造研究
小野寺陽平
2011 年 12 月 7 日

Facility Report

121

MLF Publication 2011
1

2

M. Arai
Pulsed Neutron Sources and Facilities
Neutrons in Soft Matter, edt T. Imae et al., John Wiley & Sons
Publication 601 (2011)3

Y. Arimoto, T. Yoshioka, H.M. Shimizu, K. Mishima, T. Ino,
K. Taketani, S. Muto, M. Kitaguchi, S. Imajo, Y. Iwashita, S.
Yamashita, Y. Kamiya, A. Yoshimi, K. Asahi, T. Shima, and K.
Sakai
Longitudinal-gradient magnet for time focusing of ultra-cold
neutrons
Physics Procedia 17 20 (2011)

4

5

13

二川正敏、直江崇
Dynamic responses of a solid wall in contact with a bubbly liquid
excited by thermal shock loading
Experimental Thermal and Fluid Science 35 1177 (2011)
H. Gretarsson, A. Lupascu, J. Kim, D. Casa, T. Gog, W. Wu, S.R.
Julian, Z.J. Xu, J.S. Wen, G.D. Gu, R.H. Yuan, Z.G. Chen, N.-L.
Wang, S. Khim, K.H. Kim, M. Ishikado, I. Jarrige, S. Shamoto, J.H. Chu, I.R. Fisher, and Y.-J. Kim
Revealing the dual nature of magnetism in iron pnictides and ironchalcogenides using x-ray emission spectroscopy
Physical Review B 84 100509 (R) (2011)15

T. Hemmi, S. Harjo, T. Ito, K. Matsui, Y. Nunoya, N. Koizumi, Y.
Takahashi, H. Nakajima, K. Aizawa, H. Suzuki, S. Machiya, H.
Oguro, Y. Tsuchiya, and K. Osamura
Neutron Diffraction Measurements of Internal Strain in Nb 3Sn
Cable-In-Conduit Conductors
IEEE Trans. Appl. Supercond. 21 2028 (2011)16

J. Hori, K. Furutaka, S. Goko, H. Harada, A. Kimura, T. Kin, F.
Kitatani, M. Koizumi, S. Nakamura, M. Ohta, M. Oshima, Y. Toh,
M. Igashira, T. Katabuchi, M. Mizumoto, T. Kamiyama, K. Kinox,
and Y. Kiyanagi
Measurement of Neutron Capture Gamma Rays from theResonances of 91Zr and 96Zr at the J-PARC/MLF/ANNRI
Journal of the Korean Physical Society 59 1777 (2011)17

Y. Idemoto, Y. Tsukada, N. Kitamura, A. Hoshikawa, and T.
Ishigaki.
Charge in Crystal Structure of LiNi0.8Co0.19Cu0.01O2 Cathode during
Charge of Coin Cell Observed by Ex situ Time-of-flight Neutron
Diffraction.
Chemistry Letters 40 168 (2011)18

T. Fukuda, A.Q.R. Baron, H. Nakamura, S. Shamoto, M. Ishikado,
M. Machida, H. Uchiyama, A. Iyo, H. Kito, J. Mizuki, M. Arai,and H. Eisaki
Soft and Isotropic Phonons in PrFeAsO1-y
Physical Review B 84 064504 (2011)

K. Iida, M. Kofu, N. Katayama, J. Lee, R. Kajimoto, Y. Inamura, M.
Nakamura, M. Arai, Y. Yoshida, M. Fujita, K. Yamada, and S.-H.
Lee
Inelastic neutron scattering study of the magnetic fluctuations in
Sr2RuO4
Physical Review B 84 060402 (2011)

19

R. Fukuta, S. Miyasaka, K. Hemmi, S. Tajima, D. Kawana, K.
Ikeuchi, Y. Yamasaki, A. Nakao, H. Nakao, Y. Murakami, and K.
Iwasa
Effect of cation-size variation on spin and orbital orders in
Eu1-x(La0.254Y0.746)xVO3
Physical Review B 84 140409 (2011)

H. Iikura, N. Tsutsui, T. Nakamura, M. Katagiri, M. Kureta, J.
Kubo, and M. Matsubayashi
Evaluations of the new LiF-scintillator and optional brightness
enhancement films for neutron imaging
Nuclear Instruments and Methods in Physics Research Section A
651 100 (2011)

20

R. Iizuka, H. Kagi, K. Komatsu, D. Ushijima, S. Nakano, A. SanoFurukawa, T. Nagai, and T. Yagi
Pressure responses of portlandite and H-D isotope effects onpressure-induced phase transitions

Y. Arimoto, T. Ino, H.M. Shimizu, T. Kamiyama, H. Kira, T. Oku, Y.
Sakaguchi, K. Kakurai, K. Sakai, J. Suzuki, S. Koizumi, M. Arai,
Y. Endo, M. Nakamura, T. Shinohara, M. Takeda, S. Wakimoto, D.
Yamazaki, K. Ohoymama, H. Hiraka, et al.
External cavity design of high-power diode laser for polarized
helium-3 neutron spin filters based on spin-exchange opticalpumping
Physica B 406 2439 (2011)
K.H. Chow, M. Månsson, Y. Ikedo, J. Sugiyama, O. Ofer, E.J.
Ansaldo, J.H. Brewer, M. Isobe, H. Gotou, T. Yagi, Y Ueda, and C.
Bainesµ SR Investigation of the Hollandite Vanadate K2V8O16
Physics Procedia (2011)7藤井保彦
こんにちは、AONSA です
日本中性子科学会誌「波紋」21 192 (2011)

8

T. Fukuda, A.Q.R. Baron, H. Nakamura, S. Shamoto, M. Ishikado,
M. Machida, H. Uchiyama, A. Iyo, H. Kito, J. Mizuki, M. Arai,and H. Eisaki
Phonon Spectra of PrFeAsO1-y via Inelastic X-ray Scattering
Journal of the Physical Society of Japan 80 SB015-1 (2011)1112

H. Harada, S. Goko, A. Kimura, M. Ohta, M. Oshima, F. Kitatani, Y.
Toh, K. Furutaka, T. Kin, M. Koizumi, S. Nakamura, M. Igashira, T.
Katabuchi, M. Mizumoto, T. Ohsaki, J. Hori, T. Fujii, K. Takamiya,
J. Goto, Y. Kiyanagi, K. Kino,x M. Furusaka, F. Hiraga, and T.
Kamiyamah
Study of Neutron Capture Reactions Using the 4-pai Ge
Spectrometer
Journal of the Korean Physical Society 59 1547 (2011)

藤井保彦
J-PARC 特定中性子線施設における登録機関の役割
日本中性子科学会誌「波紋」21 184 (2011)10

Neutron News 22 15 (2011)

14

6

9

122

T. Adachi, Y. Tanabe, K. Suzuki, Y. Koike, T. Suzuki, T. Kawamata,and I. Watanabe
Development of Cu-Spin Correlation in the Bi1.74Pb0.38Sr1.88Cu1-yZnyO6+δ
High-Temperature Superconductors Observed by Muon Spin
Relaxation
Physical Review B 83 184522 (2011)

二川正敏、前川藤夫、坂元眞一
1-MW pulsed spallation neutron source (JSNS) at J-PARC

Facility ReportJournal of the Physical Society of Japan 80 033710 (2011)

Physics and Chemistry of Minerals 38 777 (2011)
21

22

K. Ikeda, H. Ohshita, N. Kaneko, J. Zhang, M. Yonemura,
T. Otomo, K. Suzuya, H.Yukawa, M. Morinaga, H.-W. Li, S.
Semboshi, and S. Orimo
Data Acquisition System for High Resolution Chopper
Spectrometer (HRC) at J-PARC
Materials Transactions 52 598 (2011)
Y. Ikedo Y. Miyake, K. Shimomura, P. Strasser, K. Nishiyama,
N. Kawamura, H. Fujimori, S. Makimura, A. Koda, K. Nakahara,
T. Ogitsu, Y. Makida, T. Adachi, M. Yoshida, A. Yamamoto, T.
Nakamoto, K. Sasaki, K. Tanaka, N. Kimura, W. Higemoto, Y.
Ajima, K. Ishida, Y. Matsuda, and A. SatofThe Status of the Superomega Muon Beamline
AIP Conference Proceedings 1382 220 (2011)

23

V.A. Innis-Samson, M. Mizusawa, and K. Sakurai
X-ray Reflection Tomography: A New Tool for Surface Imaging
Analytical Chemistry 83 7600 (2011)24

T. Ino, Y. Arimoto, T. Yoshioka, K. Mishima, K. Taketani, S.
Muto, H.M. Shimizu, H. Kira, Y. Sakaguchi, T. Oku, K. Sakai, T.
Shinohara, J. Suzuki, H. Otono, H. Oide, S. Yamashita, S. Imajo, H.
Funahashi, M. Yamada, Y. Iwashita, et al.
Measurement of the neutron beam polarization of BL05/NOP
beamline at J-PARC
Physica B 406 2424 (2011)25

R. Inoue, K. Kawashima, K. Matsui, M. Nakamura, K. Nishida, T.
Kanaya, and N.L. YamadaInterfacial properties of polystyrene thin films as revealed byneutron reflectivity
Physical Review E 84 031802 (2011)

26

K. Ishii, S. Ishihara, Y. Murakami, K. Ikeuchi, K. Kuzushita, T.
Inami, K. Ohwada, M. Yoshida, I. Jarrige, N. Tatami, S. Niioka, D.
Bizen, Y. Ando, J. Mizuki, S. Maekawa, and Y. Endoh
Polarization-analyzed resonant inelastic x-ray scattering of theorbital excitations in KCuF3
Physical Review B 83 241101 (2011)

27

K. Ishii, K. Tsutsui, K. Ikeuchi, I. Jarrige, J. Mizuki, H. Hiraka, K.
Yamada, T. Tohyama, S. Maekawa, Y. Endoh H. Ishii, and Y.Q. Cai
Electronic excitations around the substituted atom in La2Cu1-yNiyO4
as seen via resonant inelastic x-ray scattering
Physical Review B 85 104509 (2011)28

M. Ishikado, Y. Nagai, K. Kodama, R. Kajimoto, M. Nakamura, Y.
Inamura, S. Wakimoto, H. Nakamura, M. Machida, K. Suzuki, H.
Usui, K. Kuroki, A. Iyo, H. Eisaki, M. Arai, and S. Shamotos±-like spin resonance in the iron-based nodal superconductor
BaFe2(As0.65P0.35)2 observed using inelastic neutron scattering
Physical Review B 84 144517 (2011)29

M. Ishikado, K. Kodama, R. Kajimoto, M. Nakamura, Y. Inamura,
S. Wakimoto, A. Iyo, H. Eisaki, M. Arai, and S. Shamoto
Inelastic neutron scattering on iron-based superconductor
BaFe2(As,P)2
Physica C 471 643 (2011)

30

T.U. Ito, W. Higemoto, K. Ninomiya, A. Amato, T. Sugai, Y. Haga,
and H. S. Suzuki
Possible Long-periodic Magnetic Structure in SmPb3
Journal of the Physical Society of Japan 80 SA075 (2011)

31

T.U. Ito, W. Higemoto, K. Ninomiya, H. Luetkens, T. Sugai, Y.
Haga, and H.S. Suzuki
Incommensurate-to-Commensurate Magnetic Phase Transition in
SmIn3 Observed by Muon Spin Relaxation

32

伊藤晋一、中山恒義
パーコレーション磁性体における反強磁性フラクトン
日本中性子科学会誌「波紋」21 234 (2011)

33

S. Itoh, T. Nakayama, and M.A. Adams
Antiferromagnetic Fractons in Diluted Heisenberg Systems
RbMn0.4Mg0.6F3 and Rb2Mn0.598Mg0.402F4
Journal of the Physical Society of Japan 80 104704 (2011)

34

S. Itoh, T. Yokoo, S. Satoh, S. Yano, D. Kawana, J. Suzuki, and T.J.
SatoHigh Resolution Chopper Spectrometer (HRC) at J-PARC
Nuclear Instruments and Methods in Physics Research Section A
631 90 (2011)

35

S. Itoh, K. Ueno, R. Ohkubo, H. Sagehashi, Y. Funahashi, and T.
Yokoo
Irradiation properties of T0 chopper components
Nuclear Instruments and Methods in Physics Research Section A
654 527 (2011)36

H. Iwase, H. Endo, M. Katagiri, and M. Shibayama
Modernization of the small-angle neutron scattering spectrometer
SANS-U by upgrade to a focusing SANS spectrometer
Journal of Applied Crystallography 44 558 (2011)

37

K. Iwase, K. Mori, Y, Hishinuma, Y. Hasegawa, S. Iimura, H.
Ishikawa, T. Kamoshida, and T. Ishigaki
Development of sample holder for in situ neutron measurement ofhydrogen absorbing alloy
International Journal of hydrogen energy 36 3062 (2011)

38

T. Kai, M. Segawa, M.Ooi, E. Hashimoto, T. Shinohara, M.
Harada, F. Maekawa, K. Oikawa, T. Sakai, M. Matsubayashi, and
M. Kureta
First demonstration of neutron resonance absorption imaging
using a high-speed video camera in J-PARC
Nuclear Instruments and Methods in Physics Research A 651 126(2011)

39

T. Kai, M. Segawa, M. Ooi, E. Hashimoto, T. Shinohara, M.
Harada, F. Maekawa, K. Oikawa, T. Sakai, M. Matsubayashi, and
M. Kureta
First demonstration of neutron resonance absorption imaging
using a high-speed video camera in J-PARC
Nuclear Instruments and Methods in Physics Research Section A
651 126 (2011)40

梶本亮一、前川藤夫、有馬寛、吉成静香、新井正敏「J-PARC/MLF JAEA プロジェクト研究に関する研究会」講
演資料集；2010 年 9 月 29 日、10 月 28 日、10 月 29 日、いばらき量子ビーム研究センター、東海村
JAEA-Review 2011-014 213 (2011)

41

R. Kajimoto, M. Nakamura, Y. Inamura, F. Mizuno, K. Nakajima,
S. Ohira-Kawamura, T. Yokoo, T. Nakatani, R. Maruyama, K.
Soyama, K. Shibata, K. Suzuya, S. Sato, K. Aizawa, M. Arai, S.
Wakimoto, M. Ishikado, S. Shamoto, M. Fujita, H. Hiraka, K.
Ohoyama, K. Yamada, and C.-H. Lee
The Fermi Chopper Spectrometer 4SEASONS at J-PARC
Journal of the Physical Society of Japan 80 SB025 (2011)

42

K. Kamada, H. Furukawa, T. Kurokawa, T. Tada, T. Tominaga, Y.
Nakano, and J.P. Gong
Surfactant-induced friction reduction for hydrogels in the boundary
lubrication regime
Journal of Physics: Condenced Matter 23 284107-1 (2011)

Facility Report

123

43

44

45

46

47

48

K. Kamazawa, H. Nozaki, M. Harada, K. Mukai, Y. Ikedo, K. Iida,
T.J. Sato, Y. Qiu, M. Tyagi, and J. Sugiyama
Interrelationship between Li+ diffusion, charge, and magnetismin 7LiMn 2O 4 and 7Li 1.1Mn 1.9O 4 spinels: Elastic, inelastic, andquasielastic neutron scattering
Physical Review B 83 094401 (2011)
Y. Kasugai, M. Ooi, and T. Kai
Gamma dose measurements and spectroscopy analysis forspallation products in JSNS mercury circulation system
Progress in Nuclear Science and Technology 1 501 (2011)
Y. Kasugai, N. Matsuda, Y. Iwamoto, Y. Sakamoto, H. Nakashima,
N. Kinoshita, H. Iwase, T. Sanami, M. Hagiwara, H. Hirayama,
H. Yashima, N. Sigyo, H. Arakawa, K. Ishibashi, N. Mokhov, A.
Leveling, D. Boehnlein, K. Vaziri, G. Lauten, S. Wayne, V. Cupps,
B. Kershisnik, S. Benesch, T. Nakamura, K. Oishi, and K. Niita
Shielding experiments under JASMIN Collaboration at Fermilab (I)Overview of the Research Activities
Journal of the Korean Physical Society 59 2063 (2011)
D. Kawaguchi, A. Nelson, Y. Masubuchi, J.P. Majewski, N. Torikai,
N.L. Yamada, A.R. Siti Sarah, A. Takano, and Y. Matsushita
Precise Analyses of Short-Time Relaxation at Asymmetric
Polystyrene Interface in Terms of Molecular Weight by TimeResolved Neutron Reflectivity Measurements
Macromolecules 44 9424 (2011)
M. Kawai, M. Futakawa, T. Naoe, H. Yamada, and C.-N. Xu
Measurements of strain-rate distributions on material after SHPB
impactEngineering Transaction 59 1 (2011)

49

S. Ohira-Kawamura, K. Nakajima, Y Inamura, Y. Tsujimoto,
A. Kitada, F. Takeiri, H. Kageyama, Y. Ajiro, M. Nishi, and K.
Kakurai
ToF Inelastic neutron scattering studies on quantum spin systems(CuCl)LaB2O7 (B = Nb, Ta)
Journal of Physics: Conference Series 320 012037 (2011)

50

A. Kimura, K. Furutaka, S. Goko, H. Harada, T. Kin, F. Kitatani,
M. Koizumi, S. Nakamura, M. Ohta, M. Oshima, Y. Toh, T. Fujii,
S. Fukutani, J. Hori, K. Takamiya, M. Igashira, T. Katabuchi, M.
Mizumoto, T. Kamiyama, K. Kino, and Y. Kiyanagi
Measurements of Neutron-capture Cross Sections of 244Cm and246
Cm at J-PARC/MLF/ANNRI
Journal of the Korean Physical Society 59 1828 (2011)

51

52

124

N. Kamaya, K. Homma, Y. Yamakawa, M. Hirayama, R. Kanno, M.
Yonemura, T. Kamiyama, Y. Kato, S. Hama, K. Kawamoto, and A.
MitsuiA lithium superionic conductor
Nature Materials 10 682 (2011)

T. Kin, K. Furutaka, S. Goko, H. Harada, A. Kimura, F. Kitatani,
S. Nakamura, M. Ohta, M. Oshima, Y. Toh, J. Hori, M. Igashira,T. Katabuchi, M. Koizumi, M. Mizumoto, T. Kamiyama, K. Kino,
and Y. Kiyanagi
The “4-pi Ge Spectrometer” for Measurements of Neutron Capture
Cross Sections by the TOF Method at the J-PARC/MLF/ANNRI
Journal of the Korean Physical Society 59 1769 (2011)
K. Kino, M. Furusaka, F. Hiraga, T. Kamiyama, Y. Kiyanagi, K.
Furutaka, S. Goko, H. Harada, M. Harada, T. Kai, A. Kimura, T.
Kin, F. Kitatani, M. Koizumi, F. Maekawa, S. Meigo, S. Nakamura,
M. Ooi, M. Ohta, M. Oshima, Y. Toh, M. Igashira, T. Katabuchi,
and M. Mizumoto
Measurement of energy spectra and spatial distributions of neutron
beams provided by the ANNRI beamline for capture cross-section
measurements at the J-PARC/MLF

Facility Report

Nuclear Instruments and Methods in Physics Research A 626-627
58 (2011)
53

K. Kino, K. Mori, M. Yonemura, S. Torii, M. Kawai, T. Fukunaga,
and T. Kamiyama
Design of Air Scattering Chamber for the Powder Diffractometer
SPICA
Journal of the Physical Society of Japan 80 SB01 (2011)54

木下秀孝、涌井隆、松井寛樹、前川藤夫、春日井好己、羽賀勝洋、勅使河原誠、明午伸一郎、関正和、坂元眞一、二川正敏
J-PARC MLF 使用済放射化機器保管計画検討結果
JAEA-Technology 2011-040

55

H. Kira, Y. Sakaguchi, T. Oku, J. Suzuki, M. Nakamura, M. Arai, Y.
Endoh, L.J. Chang, K. Kakurai, Y. Arimoto, T. Ino, H.M. Shimizu,
T. Kamiyama, K. Ohoyama, H. Hiraka, K. Tsutsumi, and K
YamadaDevelopments of In-Situ SEOP Polarized 3He Neutron Spin Filter
in Japan
Journal of Physics: Conference Series 294 012014 (2011)

56

H. Kira, Y. Sakaguchi, T. Oku, J. Suzuki, M. Nakamura, M. Arai, K.
Kakurai, Y. Endo, Y. Arimoto, T. Ino, H.M. Shimizu, T. Kamiyama,
K. Tsutsumi, K. Ohoyama, H. Hiraka, K. Yamada, and L.-J. Chang
Development and test of SEOP neutron spin filter in Japan
Physica B 406 2433 (2011)

57

Y. Kiyanagi, T. Kamiyama, H. Sato, T. Shinohara, T. Kai, K.
Aizawa, M. Arai, M. Harada, K. Sakai, K. Oikawa, M. Ohi, F.
Maekawa, T. Sakai, M. Matsubayashi, M. Segawa, and M. Kureta
Design study of the imaging beamline at J-PARC MLF, ERNIS
Nuclear Instruments and Methods in Physics Research A 651 16(2011)

58

Y. Kiyanagi, K. Kino, M. Furusaka, F. Hiraga, T. Kamiyama, K.
Kato, M. Igashira, T.Katabuchi, M. Mizumoto, M. Oshima, H.
Harada, J. Katakura, K. Furutaka, S. Goko, A.Kimura, T. Kin, F.
Kitatani, M. Koizumi, S. Nakamura, M. Ohta, Y. Toh, T. Ohtsuki,
K.Hirose, T. Fujii, J. Hori, K. Takamiya, S. Fukutani, M. Shibata, K.
Yamada, and H. Utsunomiya
The Study on Nuclear Data by Using a High Intensity Pulsed
Neutron Source for Advanced Nuclear System’ Nuclear Data
Project and the Characteristics of the Neutron Beam Line for the
Capture Cross Section Experiments at J-PARC
Journal of the Korean Physical Society 59 1781 (2011)

59

Y. Kiyanagi, T. Kamiyama, H. Sato, T. Shinohara, T. Kai, K.
Aizawa, M. Arai, M. Harada, K. Sakai, K. Oikawa, M. Ohi, F.
Maekawa, T. Sakai, M. Matsubayashi, M. Segawa, and M. Kureta
Design study of the imaging beam line at J-PARC MLF, ERNIS
Nuclear Instruments and Methods in Physics Research Section A
651 16 (2011)

60

Y. Kiyanagi
Accurate Neutron Nucleus Reaction Measurement Instrument(ANNRI) for Capture Cross Section Measurements at J-PARC
Journal of the Korean Physical Society 59 779 (2011)

61

M. Kobayashi, K. Mitamura, M. Terada, N.L. Yamada, and A.
Takahara
Characterization of Swollen States of Polyelectrolyte Brushes inSalt Solution by Neutron Reflectivity
Journal of Physics: Conference Series 272 012019 (2011)

62

W. Kobayashi, Y. Hayashi, M. Matsushita, Y. Yamamoto, I.
Terasaki, A. Nakao, H. Nakao, Y. Murakami, Y. Moritomo, H.
Yamauchi, and M. Karppinen
Anisotropic thermoelectric properties associated with dimensional

IOP Conference Series: Materials Science and Engineering 24012013 (2011)

crossover in quasi-one-dimensional SrNbO3.4+d (d-0.03)
Physical Review B 84 085118-1 (2011)
63

64

65

H.-J. Liu, U.-S. Jeng, N.L. Yamada, A.-C. Su, W.-R. Wu, C.-J. Su,
S.-J. Lin, K.-H. Wei, and M.-Y. Chiu
Surface and interface porosity of polymer/fullerene-derivative
thin films revealed by contrast variation of neutron and X-ray
reflectivity
Soft Matter 7 9276 (2011)
H. Mamiya, N. Terada, H. Kitazawa, A. Hoshikawa, and T. Ishigaki
Structural and Magnetic Properties of Dilute Spinel Ferrites:
Neutron Diffractometry and Magnetmetry Investigation.
Journal of Magnetics 16 134 (2011)
K. Matsubayashi, K. Munakata, M. Isobe, N. Katayama, K.
Ohgushi, Y. Ueda, N. Kawamura, M. Mizumaki, N. Ishimatsu, M.
Hedo, I. Umehara, and Y. Uwatoko
Pressure-induced changes in the magnetic and valence state of
EuFe2As2
Physical Review B 84 024502-1 (2011)

66

M. Matsui, K. Komatsu, E. Ikeda, A. Sano-Furukawa, H. Gotou,
and T. Yagi
The crystal structure of δ -Al(OH) 3 : Neutron diffraction
measurements and ab initio calculations
American Mineralogist 96 854 (2011)

67

H. Matsuo, Y. Kitanaka, Y. Noguchi, M. Miyayama, T. Ozaki, S.
Mori, S. Torii, and T. Kamiyama,
Ferroelectric Properties and Domain Structures of (Bi0.5K0.5)TiO3BiFeO3 ceramics
Transactions of the Materials Research Society of Japan 36 285(2011)

68

吉良弘
オンビーム Spin Exchange Optical Pumping 型 3He 偏極フィル
ターシステムの開発
日本中性子科学会誌「波紋」21 146 (2011)

69

K. Mitamura, N.L. Yamada, H. Sagehashi, H. Seto, N. Torikai, T.
Sugita, M. Furusaka, and A. Takahara
Advanced Neutron Reflectometer for Investigation on Dynamic/
Static Structures of Soft-Interfaces in J-PARC
Journal of Physics: Conference Series 272 012017 (2011)

70

71

72

73

Y. Miyake, K. Shimomura, N. Kawamura, P. Strasser, A. Koda, H.
Fujimori, S. Makimura, K. Nakahara, M. Kato, S. Takeshita, K.
Nishiyama, Y. Kobayashi, K. Kojima, R. Kadono, W. Higemoto, T.
Ito, K. Ninomiya, M. Hiraishi, M. Miyazaki, and K. Kubo
Strongest Pulsed Muon Source at J-PARC MUSE
AIP Conference Proceedings 1382 217 (2011)
Y. Miyake, N. Nishida, J. Yoshino, W. Higemoto, E. Torikai, K.
Shimomura, Y. Ikedo, N. Kawamura, P. Strasser, S. Makimura,
H. Fujimori, K. Nakahara, A. Koda, Y. Kobayashi, K. Nishiyama,
R. Kadono, T. Ogitsu, Y. Makida, K. Sasaki, T. Adachi, and K.
Nagamine
Ultra Slow Muon Microscopy for Nano-science
Journal of Physics: Conference Series 302 012038 (2011)
M. Miyazaki, R. Kadono, M. Hiraishi, T. Masuda, A. Koda, K.M.
Kojima, T. Yamazaki, Y. Tabata, and H. Nakamura
Quasi-One-Dimensional Spin Dynamics in d-Electron HeavyFermion Metal Y1-xScxMn2
Journal of the Physical Society of Japan 80 063707 (2011)
M. Mizusawa, and K. Sakurai
In-situ X-ray reflectivity measurement of polyvinyl acetate thinfilms during glass transition74

森井幸生、藤井保彦
連載講座「中性子回折の基礎と応用」を終わるにあたって
RADIOISOTOPES 60 151 (2011)

75

S. Morooka, N. Sato, M. Ojima, S. Harjo, Y. Adachi, Y. Tomota,
and O. Umezawa
In-situ Neutron Diffraction Study on Work-hardening Behavior in a
Ferrite-Martensite Dual Phase SteelInternational Journal of Automotive Engineering 2 361 (2011)76

K. Mukai, J. Sugiyama, K. Kamazawa, Y. Ikedo, D. Andreica, and
A. Amato
Magnetic properties of the chemically delithiated LixMn2O4 with
0.07<x<1
Journal of Solid State Chemistry 184 1096 (2011)77

M. Nagano, F. Yamaga, N. Zettsu, D. Yamazaki, R. Maruyama, K.
Soyama, and K. Yamamura
Development of fabrication process for aspherical neutron
focusing mirror using numerically controlled local wet etchingwith low-pressure polishing
Nuclear Instruments and Methods in Physics Research Section A
634 112 (2011)

78

K. Nakajima, S. Ohira-Kawamura, T. Kikuchi, M. Nakamura,
R. Kajimoto, Y. Inamura, N. Takahashi, K. Aizawa, K. Suzuya,
K. Shibata, T. Nakatani, K. Soyama, R. Maruyama, H. Tanaka,
W. Kambara, T. Iwahashi, Y. Itoh, T. Osakabe, S. Wakimoto, K.
Kakurai, F. Maekawa, M. Harada, K. Oikawa, R.E. Lechner, F.
Mezei, and M. Arai
AMATERAS: A Cold-Neutron Disk Chopper Spectrometer
Journal of the Physical Society of Japan 80 SB28 (2011)79

M. Nakamura, K. Nakajima, Y. Inamura, S. Ohira-Kawamura, T.
Kikuchi, T. Otomo, and M. Arai
A Possibility of Dynamical Study on Solid State Ionic Materials by
Inelastic Neutron Scattering
Atom Indonesia 36 116 (2010)80

S. Nakamura, K. Furutaka, S. Goko, H. Harada, A. Kimura, T. Kin,
F. Kitatani, M. Koizumi, M. Ohta, M. Oshima, Y. Toh, J. Hori, T.
Fujii, S. Fukutani, K. Takamiya, M. Igashira, T. Katabuchi, M.
Mizumoto, T. Kamiyama, K. Kino, and Y. Kiyanagi
Measurements of Neutron-capture Cross Sections of Palladium
Isotopes at the J-PARC/MLF/ANNRI
Journal of the Korean Physical Society 59 1773 (2011)81

T. Nakamura, R. Yasuda, M. Katagiri, K. Toh, K. Sakasai, A.
Birumachi, M. Ebine, and K. Soyama
Development of Wavelength-Shifting-Fiber Neutron Image
Detector with a Fiber-Optic Taper with a High Spatial Resolution
2011 IEEE Nuclesr Scinece Symposium Conference Record,
M-179 (2011)82

Y. Nakano, T. Kurokawa, M. Du, J. Liu, T. Tominaga, Y. Osada,and J.P. Gong
Effect of Hyaluronan Solution on Dynamic Friction of PVA Gel
Sliding on Weakly Adhesive Glass Substrate
Macromolecules 44 8908 (2011)83

中谷健、稲村泰弘
J-PARC と計算科学の連携
RIST NEWS 49 20 (2010)

84

K. Nakayama, Y. Hirose, J. Soeda, M. Yoshizumi, T. Uemura, M.
Uno, W. Li, M.J. Kang, M. Yamagishi, Y. Okada, E. Miyazaki, Y.
Nakazawa, A. Nakao, K. Takimiya, and J. Takeya

Facility Report125Patternable Solution-Crystallized Organic Transistors with High
Charge Carrier Mobility
Advanced Materials 23 1575 (2011)85

M. Uno, K. Nakayama, J. Soeda, Y. Hirose, K. Miwa, T. Uemura, A.
Nakao, K. Takimiya, and J. Takeya
High-Speed Flexible Organic Field-Effect Transistors with a 3D
Structure
Advanced Materials 23 3047 (2011)

86

直江崇、粉川広行、二川正敏、井田真人
Mitigation technologies for damage induced by pressure waves inhigh-power mercury spallation neutron sources, 3; Considerationof the effect of microbubbles on pressure wave propagation througha water test
Journal of Nuclear Science and Technology 48 865 (2011)

96

大友季哉
高エネルギー加速器研究機構と中性子全散乱装置
触媒技術の動向と展望 2011 235 (2011)

97

T. Otomo
SANS Instruments at Pulsed Neutron Sources
Neutrons in Soft Matter, T. Imae, T. Kanaya, M. Furusaka, N.
Torikai, (Eds.) 57 (2011)98

Y. Sakaguchi, H. Kira, T. Oku, T. Shinohara, J. Suzuki, K. Sakai, M.
Nakamura, K. Suzuya, K. Aizawa, M. Arai, M. Takeda, Y. Endoh,
L.J. Chang, Y. Arimoto, T. Ino, H.M. Shimizu, T. Kamiyama, K.
Ohoyama, H. Hiraka, K. Tsutsumi, K. Yamada, K. Ohara, and K.
Kakurai
Structure of glasses for 3He neutron spin filter cells
Journal of Physics: Conference Series 294 012004 (2011)99

Y. Sakaguchi, H. Kira, T. Oku, T. Shinohara, J. Suzuki, K. Sakai,
M. Nakamura, K. Aizawa, M. Arai, Y. Noda, S. Koizumi, M.
Takeda, Y. Endoh, L.J. Chang, Y. Arimoto, T. Ino, H.M. Shimizu, T.
Kamiyama, K. Ohoyama, H. Hiraka, K. Tsutsumi, K. Yamada, and
K. Kakurai
Applications of 3He neutron spin filters on the small-angle neutron
scattering spectrometer SANS-J-II
Journal of Physics: Conference Series 294 012017 (2011)

87

根本靖久
超伝導ソレノイド電磁石用ヘリウム冷凍機の運転および保守管理
Proceedings of the Meeting on the Technical Study at KEK
KEK Proceedings 2011-2 5 (2011)

88

I. Nishi, M. Ishikado, S. Ideta, W. Malaeb, T. Yoshida, A. Fujimori,Y. Kotani, M. Kubota, K. Ono, M. Yi, D.H. Lu, R. Moore, Z.-X.
Shen, A. Iyo, K. Kihou, H. Kito, H. Eisaki, S. Shamoto, and R.
Arita,
Angle-resolved photoemission spectroscopy study of PrFeAsO0.7:
Comparison with LaFePO
Physical Review B 84 014504 (2011)89

Y. Oba, S. Koppoju, M. Ohnuma, T. Murakami, H. Hatano, K.
Sasakawa, A. Kitahara, and J. Suzuki
Quantitative Analysis of Precipitate in Vanadium-microalloyed
Medium Carbon Steels Using Small-angle X-ray and Neutron
Scattering Methods
ISIJ International 51 1852 (2011)

100 Y. Sakaguchi, H. Kira, T. Oku, T. Shinohara, J. Suzuki, K. Sakai,
M. Nakamura, K. Suzuya, K. Aizawa, M. Arai, M. Takeda, S.
Wakimoto, D. Yamazaki, S. Koizumi, Y. Endoh, L.J. Chang, Y.
Arimoto, T. Ino, H.M. Shimizu, T. Kamiyama, et al.
Research on glass cells for 3He neutron spin filters
Physica B 406 2443 (2011)

90

O. Ofer, J. Sugiyama, J.H. Brewer, E.J. Ansaldo, M. Månsson, K.H.
Chow, K. Kamazawa, Y. Doi, and Y. Hinatsu
Frustration and magnetism of the zigzag chain compounds EuL2O4(L = Yb, Lu,Gd, Eu)
Physical Review B 84 054428 (2011)

101 K. Sano, R. Kawamura, T. Tominaga, N. Oda, K. Ijiro, and Y.
Osada
Self-Reparing Filamentous Actin Hydrogel with Hierarchical
Structure
Biomacromolecules 12 4173 (2011)91

H. Okabe, M. Isobe, E. Takayama-Muromachi, A. Koda, S.
Takeshita, M. Hiraishi, M. Miyazaki, R. Kadono, Y. Miyake, and J.
Akimitsu
Ba 2IrO 4: A spin-orbit Mott insulating quasi-two-dimensional
antiferromagnet
Physical Review B 83 155118 (2011)

102 K. Sano, R. Kawamura, T. Tominaga, H. Nakagawa, N. Oda, K.
Ijiro, and Y. Osada
Thermoresponsive Microtubule Hydrogel with High Hierarchical
Structure
Biomacromolecules 12 1409 (2011)

92

T. Okuda, K. Uto, S. Seki, Y. Onose, Y. Tokura, R. Kajimoto, and M.
MatsudaEffect of spin dilution on the magnetic state of delafossite CuCrO2
with an S = 3/2 antiferromagnetic triangular sublattice
Journal of the Physical Society of Japan 80 014711-1 (2011)93

Y. Onodera, K. Mori, T. Otomo, A.C. Hannon, M. Sugiyama, and T.
Fukunaga
Reverse Monte Carlo modeling of Li2S-P2S5 superionic conductors
Journal of Physics: Conference Series 340 012058 (2011)94

大井元貴、小川弘達、加美山隆、鬼柳善明
Experimental studies of the effect of the ortho/para ratio on theneutronic performance of a liquid hydrogen moderator for a pulsed
neutron source
Nuclear Instruments and Methods in Physics Research A 659 61(2011)

95

126

Shobu, K. Kiriyama, and M. Sugano
Unusual Internal Strain Behavior Exerted on YBCO Layer in the
Surround Cu Stabilized YBCO Coated Conductor
IEEE Trans. Appl. Supercond. 21 3090 (2011)

K. Osamura, S. Machiya, Y. Tsuchiya, S. Harjo, H. Suzuki, T.

Facility Report

103 A. Sano-Furukawa, T. Kuribayashi, K. Komatsu, T. Yagi, and E.
Ohtani
Investigation of hydrogen sites of wadsleyite: A neutron diffraction
study
Physics of the Earth and Planetary Interiors 189 56 (2011)
104 M. Sato, T. Kawamata, Y. Kobayashi, Y. Yasui, T. Iida, K. Suzuki,
M. Itoh, T. Moyoshi, K. Motoya, R. Kajimoto, M. Nakamura, Y.
Inamura, and M. Arai
Magnetic Excitation Spectra of Superconducting Ca–Fe–Pt–As
SystemJournal of the Physical Society of Japan 80 093709 (2011)
105 瀬戸秀紀
リン脂質膜を中性子で見る
高分子 60 804 (2011)
106 瀬戸秀紀、日野正裕、山田悟史
パルス中性子源における NSE 〜終わりに代えて
日本中性子科学会誌「波紋」21 239 (2011)

107 S. Shamoto, S. Wakimoto, K. Kodama, M. Ishikado, A.D.
Christianson, M.D. Lumsden, R. Kajimoto, M. Nakamura, Y.
Inamura, M. Arai, K. Kakurai, F. Esaka, A. Iyo, H. Kito, and H.
Eisaki
Neutron scattering of iron-based superconductors
Physica C 471 639 (2011)108 H. Shigematsu, K. Nomura, K. Nishiyama, T. Tojo, H. Kawaji, T.
Atake, Y. Kawamura, T. Miyoshi, Y. Matsushita, M. Tanaka, and H.
Mashiyama
Structures and Phase Transitions in Rb2MoO4 and Rb2WO4
Ferroelecrrics 414 195 (2011)
109 K. Shimomura
Possibility of precise measurements of muonium HFS at J-PARCMUSE
AIP Conference Proceedings 1382 245 (2011)
110 S. Shinamura, I. Osaka, E. Miyazaki, A. Nakao, M. Yamagishi, J.
Takeya, and K. Takimiya
Linear- and Angular-Shaped Naphthodithiophenes; Selective
Synthesis, Properties, and Application to Organic Field-EffectTransistors
Journal of the American Chemical Society 133 5024 (2011)
111 T. Shinohara, K. Sakai, M. Ohi, T. Kai, M. Harada, K. Oikawa, F.
Maekawa, J. Suzuki, T. Oku, S. Takata, K. Aizawa, M. Arai, and Y.
Kiyanagi
Quantitative magnetic field imaging by polarized pulsed neutrons
at J-PARC
Nuclear Instruments and Methods in Physics Research Section A
651 121 (2011)

118 J. Sugiyama, M. Månsson, O. Ofer, K. Kamazawa, M. Harada,
D. Andreica, A. Amato, J.H. Brewer, E.J. Ansaldo, H. Ohta, C.
Michioka, and K. Yoshimura
Successive magnetic transitions and static magnetic order in
RCoAsO (R=La, Ce, Pr, Nd, Sm, Gd) confirmed by muon-spinrotation and relaxation
Physical Review B 84 184421 (2011)
119 Y. Sumino, H. Kitahata, H. Seto, and K. Yoshikawa
Dynamical blebbing at a droplet interface driven by instability inelastic stress: a novel self-motile system
Soft Matter 7 3204 (2011)
120 鈴谷賢太郎
中性子回折・全散乱法による液体・非晶質構造解析の基礎
Radioisotopes 60 63 (2011)
121 N. Takahashi, K. Shibata, Y. Kawakita, K. Nakajima, Y. Inamura,
T. Nakatani, H. Nakagawa, S. Fujiwara, T.J. Sato, I. Tsukushi, F.
Mezei, D.A. Neumann, H. Mutka, and M. Arai
Repetition Rate Multiplication: RRM, an Advanced Measuring
Method Planed for the Backscattering Instrument, DNA at the
MLF, J-PARC
Journal of the Physical Society of Japan 80 Suppl. B SB07 (2011)122 Y. Takenaka, H. Kitahata, N.L. Yamada, H. Seto, and M. Hara
Growth of gold nanorods in gelled surfactant solutions
Journal of Colloid and Interface Science 356 111 (2011)112 篠原武尚
偏極中性子を用いたイメージング
日本中性子科学会誌「波紋」21 180 (2011)

123 K. Taketani, T. Ebisawa, M. Hino, K. Hirota, T. Ino, M. Kitaguchi,
K. Mishima, S. Muto, H. Oide, T. Oku, H. Otono, K. Sakai, T.
Shima, H.M. Shimizu, S. Yamashita, and T. Yoshioka
A high S/N ratio spin flip chopper system for a pulsed neutron
sourceNuclear Instruments and Methods in Physics Research Section A
634 S134 (2011)

113 L. Shu, W. Higemoto, Y. Aoki, A.D. Hillier, K. Ohishi, K. Ishida, R.
Kadono, A. Koda, O.O. Bernal, D.E. MacLaughlin, Y. Tunashima,
Y. Yonezawa, S. Sanada, D. Kikuchi, H. Sato, H. Sugawara, T.U.
Ito, and M.B. Maple
Suppression of time-reversal symmetry breaking superconductivity
in Pr(Os1-xRux)4Sb12 and Pr1-yLayOs4Sb12
Physical Review B 83 100504 (2011)

124 Y. Tanabe, T. Adachi, K. Suzuki, T. Kawamata, Risdiana, T.
Suzuki, I. Watanabe, and Y. Koike
Similarity between Ni and Zn Impurity Effects on the
Superconductivity and Cu-Spin Correlation in La 2-xSrxCu1-yNiyO4
High-Tc Cuprates: A Comparison Based on the Hole Trapping by
Ni
Physical Review B 83 144521 (2011)

114 J. Soeda, Y. Hirose, M. Yamagishi, A. Nakao, T. Uemura, K.
Nakayama, M. Uno, Y. Nakazawa, K. Takimiya, and J. Takeya
Solution-Crystallized Organic Field-Effect Transistors with
Charge-Transfer Layers: High-Mobility, Printable, Air-stable and
Low-Threshold-Voltage Operation in Air
Advanced Materials 23 3309 (2011)

125 田中伊知朗、日下勝弘、細谷孝明、大原高志、栗原和男、
新村信雄、山田太郎、友寄克亮、横山武司、大西裕季、大隅孝志、内田裕久、鈴木榮一郎、柏木立己、宮本晃男、古川保典、吉村政志、河村貴宏
茨城県生命物質構造解析装置 (iBIX) による水素・水和水の構造研究 / 産業利用
RADIOISOTOPES 60 89 (2011)

115 J. Soeda, T. Uemura, Y. Mizuno, A. Nakao, Y. Nakazawa, A.
Facchetti, and J. Takeya
High Electron Mobility in Air for N,N’-1H,1H-Perfluorobutyldicyanoperylene Carboxydiimide Solution-Crystallized Thin-film
Transistors on Hydrophobic Surfaces
Advanced Materials 23 3681 (2011)
116 Y. Su, Y. Tomota, J. Suzuki, and M. Ohnua
Hydrogen Behavior in an Ultrafine-Grained Electrodeposited Pure
Iron
ISIJ International 51 1534 (2011)
117 J. Sugiyama, H. Nozaki, M. Harada, K. Kamazawa, O. Ofer, M.
Månsson, J.H. Brewer, E.J. Ansaldo, K.H. Chow, Y. Ikedo, Y.
Miyake, K. Ohishi, I. Watanabe, G. Kobayashi, and R. Kanno
Magnetic and diffusive nature of LiFePO4 investigated by muon
spin rotation and relaxation
Physical Review B 84 054430 (2011)

126 I. Tanaka, K. Kusaka, T. Hosoya, N. Niimura, T. Ohhara, K.
Kurihara, T. Yamada, Y. Ohnishi, K. Tomoyori, and T. Yokoyama
Neutron structure analysis using the IBARAKI biological crystal
diffractometer (iBIX) at J-PARC
Acta Crystallographica Section D 66 1194 (2010)
127 H. Tatsumoto, T. Aso, T. Kato, K. Ohtsu, F. Maekawa, and M.
Futakawa
Design of a high power heater for the cryogenic hydrogen systemat J-PARC
Cryogenics 51 315 (2011)
128 Y. Terayama, H. Arita, T. Ishikawa, M. Kikuchi, K. Mitamura, M.
Kobayashi, N.L. Yamada, and A. Takahara
Chain dimensions in free and immobilized brush states ofpolysulfobetaine in aqueous solution at various salt concentrations
Journal of Physics: Conference Series 272 012010 (2011)

Facility Report127129 K. Toh, T. Nakamura, K. Sakasai, and K. Soyama
Effects of Gamma-Rays on Polymethylmethacrylate Plastic OpticalFiber under Low Dose-Rate Irradiation2011 IEEE Nuclesr Scinece Symposium Conference Record,
M-149 (2011)
130 K. Tomiyasu, and K. Kamazawa
A spin molecule model for geometrically frustrated spinel ZnFe2O4
Journal of the Physical Society of Japan 80 SB024 (2011)
131 S. Torii, M. Yonemura, T.Y.S. Panca Putra, J. Zhang, P. Miao, T.
Muroya, R. Tomiyasu, T. Morishima, S. Sato, H. Sagehashi, Y.
Noda, and T. Kamiyama
Super High Resolution Powder Diffractometer at J-PARC
Journal of the Physical Society of Japan 80 SB20 (2011)132 N. Torikai, N.L. Yamada, D. Kawaguchi, A. Takano, Y. Matsushita,
E. Watkins, and J.P. Majewski
Depth distribution of different solvents in a phase-separated block
copolymer thin film
Journal of Physics: Conference Series 272 012027 (2011)
133 N. Torikai, N.L. Yamada, H. Sagehashi, T. Sugita, M. Furusaka, Y.
Higashi, M. Hino, T. Fujiwara, and H. Takahashi
Development of a Physically Bent Cylindroid Mirror for Beam
Focusing for a Pulsed Neutron Reflectometer
IOP Conference Series: Materials Science and Engineering 24012016 (2011)
134 鳥飼直也、山田悟史、川口大輔
中性子・X 線斜入射散乱法によるブロック共重合体薄膜のその場構造観察日本中性子科学会誌「波紋」21 91 (2011)
135 T. Toriyama, A. Nakao, Y. Yamaki, H. Nakao, Y. Murakami, K.
Hasegawa, M. Isobe, Y. Ueda, A.V. Ushakov, D.I. Khomskii, S.V.
Streltsov, T. Konishi, and Y. Ohta
Peierls Mechanism of the Metal-Insulator Transition in
Ferromagnetic Hollandite K2Cr8O16
Physical Review Letters 107 266402-1 (2011)
136 S. Wakimoto, K. Kodama, M. Ishikado, M. Matsuda, R. Kajimoto,
M. Arai, K. Kakurai, F. Esaka, A. Iyo, H. Kito, H. Eisaki, and S.
ShamotoDegradation of Superconductivity and Spin Fluctuations by
Electron Overdoping in LaFeAsO1-xFx
Journal of the Physical Society of Japan 79 074715-1 (2010)
137 P.G. Xu, H. Suzuki, S. Harjo, and T. Suzuki
Development and Prospect of Bulk Texture Measurement Technique
by Neutron Diffraction
Proceedings of 120th Spring Conference of the Japan Institute ofLight Metals 289 (2011)
138 N.L. Yamada, N. Torikai, K. Mitamura, H. Sagehashi, S. Sato,
H. Seto, T. Sugita, S. Goko, M. Furusaka, T. Oda, M. Hino, T.
Fujiwara, H. Takahashi, and A. Takahara
Design and Performance of Horizontal Type Neutron Reflectometer
SOFIA at J-PARC/MLF
The European Physical Journal Plus 126 108 (2011)139 H. Yamagishi, K. Toh, T. Nakamura, K. Sakasai, and K. Soyama
Simulation program for multiwire-type two-dimensional neutron
detector with individual readout
Journal of Instrumentation 6 C12025 (2011)
140 T. Yamamoto, Y. Nakazawa, M. Tamura, A. Nakao, Y. Ikemoto, T.
Moriwaki, A. Fukaya, R. Kato, and K. Yakushi
I n t r a d i m e r C h a rg e D i s p ro p o r t i o n a t i o n i n Tr i c l i n i c EtMe3P[Pd(dmit)2]2 (dmit: 1,3-Dithiole-2-thione-4,5-dithiolate)

128

Facility Report

Journal of the Physical Society of Japan 80 123709-1 (2011)
141 S. Yano, S. Itoh, S. Satoh, T. Yokoo, D. Kawana, and T.J. Sato
Data acquisition system for high resolution chopper spectrometer(HRC) at J-PARC
Nuclear Instruments and Methods in Physics Research Section A
654 421 (2011)
142 T. Yokoo, N. Kaneko, S. Itoh, T.Otomo, K. Suzuya, Y. Suetsugu,
and M. Shirai
Examination of gas desorption by B4C resin for use in neutron
scattering experiment
Review of Scientiﬁc Instruments 82 95109 (2011)
143 T. Yui, Y. Kobayashi, Y. Yamada, K. Yano,Y. Fukushima, T.
Torimoto, and K. Takagi
Photoinduced Electron Transfer between the AnionicPorphyrins
and Viologens in Titania Nanosheetsand Mono-disperse
Mesoporous Silica Hybrid Films
ACS Appl. Mater. Interfaces 3 931 (2011)
144 Y. Zhou, M. Matsuo, Y. Miura, H. Takamura, H. Maekawa, A.
Remhof, A. Borgschulte, A. Züttel, T. Otomo, and S.-I. Orimo
Enhanced Electrical Conductivities of Complex Hydrides Li2(BH4)(NH2) and Li4(BH4)(NH2)3 by Melting
Materials Transactions 52 654 (2011)
145 Muon Science Laboratory, IMSS Muon Section, Materials and Life
Science Divison
Presentations for the Muon Science Advisory (and the 9th Muon
Science Experimental Facility Advisory Committee) MuSAC
KEK-Proceedings 2011-3 (2011)

Editorial Board - MLF Annual Report 2011

Chief Editor

Mitsutaka Nakamura
Neutron Science Section

Tetsuya Yokoo

Shinichi Takata

Neutron Science Section

Neutron Science Section

Shin-ichiro Meigo

Hiroyuki Kogawa

Neutron Source Section

Neutron Source Section

Hiroki Iwase

Yoshifumi Sakaguchi

CROSS-TokaiCROSS-Tokai

Kaoru Sakasai

Toshinori Asai

Neutron Instrumentaion Section

CROSS-Tokai

Garry Foran

Kenji M. Kojima

CROSS-Tokai

Muon Science Section

MLF 2011

129