J-PARC
ANNUALREPORT2 O 1 3J A PA N P R O T O N A C C E L E R AT O R R E S E A R C H C O M P L E X

J-PARC Annual Report 2013
Contents
Preface……………………………………………………………………………………………………………

1

Hadron Incident……………………………………………………………………………………………………

3

Introduction…………………………………………………………………………………………………… 4
Outline of the Incident ……………………………………………………………………………………… 4
Analysis of the Causes of the Incident ………………………………………………………………………… 7
Preventive Measures………………………………………………………………………………………… 8
Present Status and Outlook………………………………………………………………………………… 10
Accelerators……………………………………………………………………………………………………… 11
Overview…………………………………………………………………………………………………… 12
LINAC……………………………………………………………………………………………………… 13
RCS………………………………………………………………………………………………………… 15
MR………………………………………………………………………………………………………… 18
Materials and Life Science Experimental Facility………………………………………………………………… 21
Overview…………………………………………………………………………………………………… 22
Neutron Source…………………………………………………………………………………………… 24
Neutron Science…………………………………………………………………………………………… 26
Muon Science……………………………………………………………………………………………… 30
Neutron Device…………………………………………………………………………………………… 32
Particle and Nuclear Physics……………………………………………………………………………………… 33
Muon Neutrinos Turn to Electron Neutrino (T2K)…………………………………………………………… 34
Hadron and Nuclear Physics ……………………………………………………………………………… 36
Kaon Experiment …………………………………………………………………………………………… 38
COMET …………………………………………………………………………………………………… 39
g-2 / EDM ………………………………………………………………………………………………… 40
Cryogenics Section ……………………………………………………………………………………………… 41
Overview…………………………………………………………………………………………………… 42
Superconducting Magnet System………………………………………………………………………… 42
Cryogen Supply and Technical Support…………………………………………………………………… 44
R&D for the Future J-PARC Project: New Muon g-2/EDM and Muonium HFS……………………………… 46
Information System……………………………………………………………………………………………… 47
Statistics of Network Utilization …………………………………………………………………………… 48
Statistics of Computer Resource Utilization………………………………………………………………… 51
Transmutation Studies…………………………………………………………………………………………… 53
Activities…………………………………………………………………………………………………… 54

Safety …………………………………………………………………………………………………………… 57
Radiation Safety…………………………………………………………………………………………… 58
Users Office ……………………………………………………………………………………………………… 61
User Program……………………………………………………………………………………………………… 65
Overview of the MLF Use ………………………………………………………………………………… 66
Proposal Review System for MLF…………………………………………………………………………… 68
MLF Proposal Summary - FY2013 ………………………………………………………………………… 68
Proposal Review System for Nuclear and Particle Physics Experiments
at the J-PARC “50 GeV” Proton Synchrotron…………………………………………………………… 71
Approval Summary of the Nuclear and Particle Physics Experiments
after the 17th PAC Meeting (September 25, 2013) …………………………………………………… 71
Organization and Committees…………………………………………………………………………………… 73
Organization Structure …………………………………………………………………………………… 74
Members of the Committees Organized for J-PARC………………………………………………………… 75
Main Parameters ………………………………………………………………………………………………… 79
Events ……………………………………………………………………………………………………………… 81
Publications……………………………………………………………………………………………………… 89
Publications in Periodical Journals ………………………………………………………………………… 90
Conference Reports and Books…………………………………………………………………………… 95
KEK Reports ………………………………………………………………………………………………… 101
KEK Preprints ……………………………………………………………………………………………… 101
JAEA Reports ……………………………………………………………………………………………… 101

J-PARC Annual Report 2013

Preface1

Preface
If I need to select one word to define “Year 2013”, it should be “the Hadronincident”. On May 23, 2013, radioactive materials leaked from a primary beamline
area to an experimental hall of the Hadron facility, and then were released theoutside of the radiation-controlled area of the facility. This incident, regardless of
the released amount, had a tremendous impact not only on the J-PARC’s operation
and users community, but also on the society at large: the residents and the local
government of Tokai-mura, the neighboring municipalities, other accelerator user
facilities, The Radiation Regulation Authority, and MEXT.
In order to develop preventive measures against recurrence of a similar
accident, we investigated the cause(s) of the incident and reviewed J-PARC’s safety
management system. The measures included, but were not restricted to, taking
every action to enhance the level of our safety caution, establishing a new safety
review system, and reorganization of J-PARC Center’s management structure.
In parallel to the investigation of incident's causes, we prepared a renovation
plan for the Hadron facility to ensure workers' safety. I would like to appreciate all of
the J-PARC staff members, in particular, those of the Hadron facility, for their sincere
self-sacrificing contribution to the recovery work.

Preface

J-PARC Annual Report 20132

As a user facility, we have a mission to steadily deliver beam to users. Due toincredible work of the J-PARC staff members, it was concluded that the facilities,
other than the Hadron, were safe enough to approve the restart of the operation,and finally, the Materials and Life Experimental Facility was able to resume its user
operation in February 2014.
Beside the Hadron incident, another exciting outcome through the 2013 FY
should be noted here. I am very proud of a remarkable accomplishment by the T2K
collaboration to discover the electron neutrino appearance from muon neutrino,
which has been one of their scientific goals. I also have to stress that we havesuccessfully completed the energy upgrade to 400 MeV at Linac. This achievement
gave a technological base for the 1 MW power goal of J-PARC.
The FY 2013 should be an unforgettable year for all people related to J-PARC. Here,I would like to thank again all of you for your faithful work, significant contributions
and continuous support for the constant progress at J-PARC.

Yujiro Ikeda
Director of the J-PARC CenterHadron Incident

Hadron Incident

J-PARC Annual Report 2013

4

Introduction
A radioactivity leak incident1 occurred on May
23, 2013, in the Hadron (HD) Experimental Facility of
J-PARC. Because of a malfunction of the slow extraction system of the main ring (MR: 50 GeV synchrotron),a proton beam with abnormally high instantaneous
power density was delivered to the gold target for kaon
production, and caused partial melting and evaporation of the target, and resulted in exposure of thirty-four
workers in the experimental hall, and release of radioactive materials to outside of the controlled area of the
HD hall. The incidence was, therefore, an event thatshould be notified to relevant authorities and local governments. The reporting, however, was delayed due toinappropriate emergency responses.
The issues of the incident were summarized as follows:
1) Release of radioactive material to the environment
outside of the controlled area,2) Delay in reporting the incident to relevant authorities and local governments, and
3) Exposure of workers in the HD hall.
A direct cause of the incident was a malfunction of
the slow extraction system of MR. As described later,
however, there were also failures in taking measures toprevent exposure of workers and diffusion of radioactive materials, although the exposure and the influence
to the environment was not serious as noted in section
3. For these reasons, the incident was evaluated as Level
1 The term “incident” is employed in place of “accident” which
has been used in the report from J-PARC Center, according to
the criterion by INES described below.

1 (incident) in the International Nuclear and Radiological Event Scale (INES), which means “Anomaly” with thewords “lack of safety culture” by the Nuclear Regulation
Authority of Japan (NRA).
For thoroughly reviewing the causes of the incident
and the emergency responses in J-PARC, an external experts panel (EEP) was set-up by the two parent
organizations of J-PARC, Japan Atomic Energy Agency(JAEA) and High Energy Accelerator Research Organization (KEK), in response to the request from the Ministerof Education Culture, Sports, Science and Technology.
A Working-group (WG) was formed under this EEP andanalyzed possible causes of the incident and the safety
management system in collaboration with J-PARC
Center. The EEP examined also the soundness of the
facilities other than the HD facility in J-PARC.
The present report describes an overview of theincident, i.e., the outline of the incident including
influence of the incident, analysis of the causes of theincident, and preventive measures against recurrenceof a similar incident on the basis of the EEP summary
report [1] and the final (third) statutory report submitted from the J-PARC to the NRA on Aug 12, 2013 [2]. The
information publicized from J-PARC Center after thesubmission of these reports was also included [3-6]. The
third statutory report provided a detailed review on theincident and clarified what were the problems in emergency procedures, and also outlined possible measures
to prevent similar incidents. It also described how thefacilities other than the HD facility are maintained interms of the radiation safety.

Outline of the Incident
On May 23, experiments were being carried out inthe HD hall of J-PARC using kaon beams produced via
spallation reactions of 30 GeV proton beam extracted
from MR with the gold target. Figures 1 and 2 show,respectively, the layout of the HD hall and the gold target. The primary beamline was designated as the 1stclass radiation controlled area where radioactive materials may exist, but user working areas in the HD hall
was assigned to be 2nd class radiation controlled area
where radioactive materials were not taken into management, owing to the air-tight design of the shielding
wall of the primary beam line.

Proton beam to the HD hall was extracted from MR
through a slow extraction system employing extraction
quadruple (EQ) magnets to make even the proton beam
intensity over two seconds. A gold square bar, 6 mm ×
6 mm square in cross-section and 66 mm in length, wasused as the target and mounted on a water-cooled copper block for heat removal. The container of the gold
target was not hermetically sealed.
At around 11:55, a malfunction occurred in the
power supply (PS) system of the EQ magnets of MR,
and 2 × 1013 protons were delivered to the gold target
in a very short period of five milliseconds, whereas in

J-PARC Annual Report 2013

Hadron Incident

5
normal operation, 3 × 1013 protons should have been
evenly extracted over two seconds. Although the beam
was halted by the machine protection system (MPS),
the instantaneous proton power far exceeded thedesign condition, and thereby a part of the gold target melted and evaporated along with the beam axis,
as target melted and evaporated along with the beamaxis, as presumed by the simulation calculation and wasconfirmed later in the inspection of the target with afiberscope (Fig.3) [3]. Further, as shown in Fig.4, sprayedout gold was observed on the beryllium widow in thedownstream side. This fact indicated that gold was
pushed outward because of very rapid volume expansion resulted from vaporization of the melted gold.
These observations match very well with the presumption based on the simulation shown in Fig.5.

K1.8
K1.8BR

Beam
Dump
Protonbeam
GoldtargetKL

Primary beamline

K1.1BR

0

4

12

1

20m

Fig. 1. Layout of the HD Hall.

Fig. 3. Picture of gold target damaged.

Fig. 2. Structure of gold target for HD facility.

Fig. 4. Beryllium window for gold target.

Proton beam

2974°C

06001200 1800 2400 3000 Temp.

Fig. 5. Temperature distribution within gold target at the time of incident.

(°C)

Hadron Incident

J-PARC Annual Report 20136
Consequently, radioactive materials which had
been accumulated in the target via the spallation
reactions were released into the primary beamline
room because the target container was not hermetically sealed. Then the materials diffused to the HD hallbecause of insufficient airtightness of the beamline
room, and caused exposure of workers (users and staff ),in the HD hall. Even worse, the materials were released
to the environment outside of the radiation controlledarea of the HD facility by two-times inadvertent operations of ventilation fans in the HD hall: the first one wasfor checking radiation monitor’s reliability and the second one was for reducing radiation does in the hall.
Because radioactive materials were released tothe environment outside the radiation controlled areaof the HD facility, the event should be notified to therelevant authorities in central and local governments
as being obliged by the Japanese Radiation Regulation
Law and the Agreement between local governments
and JAEA. However, this fact was not recognized until
receiving an inquiry from the Nuclear Fuel Engineering
Laboratory (NFEL) of JAEA about small increases in theradiation level at monitoring posts placed at a boundary between J-PARC and NFEL, in the evening of thenext day, May 24. Consequently, the notification was
delayed by one and half days.
Major events and our actions after the abnormal
beam shot on May 23, are summarized in the chronological order below:
May 23
11:55 Abnormally short proton beam was delivered
to the target in the HD hall and halted by MPS.
MPS indicated a tracking error which means toolarge deviation between the command and the
response of the EQ system.
12:08 MPS was reset by the regular procedure, deliveryof proton beam was restarted.
12:15 Decrease in secondary particle yields wasobserved, and beam course was adjusted.
12:55 High count rates in the safety counter and scintillation detector for experiment were recognized.
13:30 Increased radiation dose rate in five area monitorsof the HD hall to 4 μSv/h maximum, which was
about ten-times as high as the normal value.
15:15 Ventilation fans were turned on to check themonitor’s validity. Radioactive materials werereleased to the outside the HD radiation controlled area.
17:00 Radiation survey of the HD hall indicated detect-able contamination and high dose rate.
17:20 Sampling of air in the HD hall to check the radioactive material contamination.
17:30 Ventilation fans were turned on to reduce airborne radiation dose rate. Evacuation of workers
from the HD hall began.
18:20 Radioactive nuclides other than activation products were recognized within the air sample takenin the HD hall.
23:30 Survey measurement and decontamination ofworkers were completed, and access to the HD
hall was prohibited.
May 2414:00 Started whole-body-counter (WBC) measurement for checking internal exposures.
17:30 Inquiry from NFEL about increases in radiationlevel at their monitoring posts. Inspection of thedata log of area monitors indicated radioactive
materials leak to outside the radiation controlledarea of the HD facility.
21:10 The first report was faxed to the NRA, Ibaraki Prefecture, Tokai Village and other authorities.
May 25
0:46 Operation of all accelerators and experiments atMaterial and Life Science Experimental Facility(MLF) were stopped.
1:00 The results of first WBC measurement indicatedthat 4 workers in the HD hall were internally
exposed in the range from 0.6 to 1.6 mSv.
Within the airborne sample taken in the HD hall,various nuclides attributable to a spallation reaction ofgold were identified with a gamma-ray spectrum [5].
Most of them were short-lived, but some were relatively
long-lived ones such as 125I (Half-life is 59.5 d) and 75Se
(120 d). The species and relative abundance of these
nuclides were in qualitative agreement with model calculations [5].
Hundred two persons who were in the HD hall during and/or after the incident were checked with a WBC
measurement and a glass badge for their internal andexternal exposures, respectively [2]. All of them wereregistered as radiation workers. WBC measurements
were carried out using a germanium detector andspecial database that were prepared for the airborne
nuclides found in the HD hall. The highest contributors
to internal dose were 197Hg and 195mHg. Thirty-four workers received detectable radiation exposure. The internal

J-PARC Annual Report 2013

Hadron Incident

7
dose (committed effective dose) and external dose
(effective dose) were deduced from the measurements.
The highest does of internal and external doses were
1.7 mSv and 0.1 mSv, respectively. The total exposure
dose ranged from 0.1 to 1.7 mSv which is about 1/30 of
the annual dose limit for radiation workers (50 mSv/yr).
Medical examination was performed for all of the hundred-two persons, and no adverse effects due to theradiation exposure were confirmed.
The total amount of radioactive material that was
released to outside of the HD hall was estimated with adiffusion simulation, on the basis of radioactive isotopes

found in the airborne sample collected in the HD hall aswell as the readings of the area monitors in the HD hall.
It was found to be ~20 GBq. The radiation dose, which
could be experienced if he/she were at the J-PARC siteboundary closest to the HD facility, was estimated to be
0.17 μSv. This exposure dose was not so high but was
unplanned one. From a fundamental view of radiation
safety in a user facility, unplanned radiation exposure
should not be validated regardless of the amount [2].
In addition, soil samples around the site boundary
were also examined, but no contamination from incident- originated spallation product was detected.

Analysis of the Causes of the Incident
As described above, the direct causes of the incident were failures in the accelerator and equipment,i.e., a malfunction of EQ magnets for slow extraction
system of MR, lack of a hermetic target container andinsufficient air-tightness of the primary beamline roomand the HD hall.
A systematic inspection to find out the cause of themalfunction of EQ magnets revealed that the malfunction was due to the degradation of the power supply
that supplies a voltage to the interface circuit board of
EQ magnet that converts an external input signal. The
degradation was due to insufficient preventive measures against overheating in a three terminal positive
output regulator [3]. At the same time, the following
problems were also pointed out [1,2]:a) The current limit setting of the EQ magnet was toohigh;b) MPS was designed only to provide a warning but not
to stop the EQ magnet power supply regardless ofthe seriousness, i.e., a tracking error;c) A response time of the EQ magnet current supply was
set up to ~5.5 ms and was not fast enough to preventthe incidence;d) The radiation monitor system of the HD hall was not
sufficient, i.e., no monitor displays were placed in the

HD shift console and the central control room. Further, the monitor was not equipped with a functionof multi-leveled warning. These problems were also
the cases for the Neutrino Experimental Facility.
In addition to the hardware problems, the chronological sequence of events indicates that emergency
actions against the incidence were so late, in spite ofvarious information suggesting abnormality of the situation such as high dose rate and high background incounters, etc. The delay of emergency actions led tothe exposure of workers and the release of radioactive materials to outside the radiation controlled area.
In other words, information was not integrated andshared among relevant personnel. This resulted in the
delay of proper recognition of the situation and emergency actions such as evacuation of workers.
Furthermore, it should be pointed out that misunderstanding of the status of radiation and the radiation
regulation law led to the operation of ventilation fans.
Therefore, the safety management system, a software
aspect is also a very important point in the analysis of
the incident.
For these reasons, the causes of the incident can bedivided into two aspects: hardware and the software
ones.

Preventive Measures
As noted in the previous section the deficiencies
in the radiation safety management system of J-PARC
Center were the background of the incident as well as

those in the accelerator and radiation monitors. Therefore, the preventive measures that were proposed from
J-PARC Center cover both the hardware and software

Hadron Incident

J-PARC Annual Report 20138(safety management system) aspects.
1. Accelerator and equipment (hardware) [1,2]The preventive measures against recurrence ofsimilar incidents consist of the following standpoints:(1) prevention of the radioactive material leak and (2)prevention of radioactive exposure. They are summarized in Table 1.
These preventive measures are developed basedon the concept of “defense-in-depth”, i.e., preventionof occurrence of incidents, prevention of expansionof the effect, and minimization of damage or effect by
a combination of multilayered preventive measures.

Furthermore, ensuring soundness of other facilities of
J-PARC, the MLF, the Neutrino Experimental Facility, and
the Accelerator Facility, was important in the preventive
measures. These facilities were examined on their validity of a classification of radiation controlled areas, safety
management equipment, and the soundness of instruments and devices. It turned out that the classificationof radiation controlled areas and the radiation control
were adequate, and also it was confirmed that, at thesefacilities, the instruments and devices were highly safe
owing to multiple barriers for prevention of radioactive
material leak to outside.

Table 1. Preventive measures relevant to accelerator and equipment.
IssuesAnomalous beam
extraction
Damage to the target

Leakage of radioactive
material to outside thecontrolled area

Insufficient radiation
monitorPreventive measures- Revising current limit setting of the EQ magnet power supply (PS)- Shutdown of the magnet PS on detection of anomalous current deviation- Improving interlock system for faster shut down of the magnet PS on an anomalous operating
condition- Improving target temperature monitoring system- Retracting the target off the beam orbit during accelerator studies- Employing a hermetically sealed target container- Monitoring radioactive material in a target container- Reinforcing airtightness in the primary beam-line room
- Monitoring radioactive material in the primary beamline room
- Exhausting the air of the HD hall through filters from a stack, after checking concentration ofradioactive material- Installing radiation monitors in an operation console- Reinforcing monitoring functions: alarm level setting, trend data, etc.
- Sharing of radiation monitor information into accelerator operation system

2. Safety management system (software)
The preventive measures from the aspect of safety
management are summarized in Table 2 and Fig.6. The
following four points are the essence of the measures:1) reinforcing safety management system,2) clarifying the criterion for emergency response,3) reinforcing the review system for radiation safety,
and4) fostering safety culture.
They are addressed from the study on the fact thatquick and adequate responses could not be taken in
the Hadron incident. A fundamental problem was thelack of imagination and/or understanding on possible
risks, and actions to be taken in emergency becauseof the ambiguity in staff’s responsibility and the command line in emergency. Underlying concept of therenewed safety organization is that the safety of the
facility is of the responsibility of each own facility, notthe safety division.

In the new safety management system, “Alert
Status” is introduced to facilitate systematic actions
in emergency. It is setup for a time when an anomalous situation occurs, such as turning-on of high-risk
interlock or an anomalous radiation behavior, etc. In
Alert Status, relevant personnel congregate to central
control room or other appropriate place, and collectinformation to understand the situation and the necessary actions under the direction of the facility manager.
This will enable quick griping of the situation at an earlystage and making proper actions in timely manner.
In addition, Radiation Safety Review Committee
was newly organized to enhance a risk review capability
at J-PARC by inviting external experts (Fig.6). The committee is expected to provide detailed risk assessment
and preventive measures for planned new apparatus
and works. The risks include, but not limited to, a highradiation dose, a high contamination environment,
works in a high place, etc.

J-PARC Annual Report 2013

Hadron Incident

9
Table 2. New measures in the safety management system (software).
IssuesUnclear responsibility
and command line
Insufficient radiation
safety review capability
Unclear criterion forjudgment and actions

Insufficient safety
culturePreventive measures- Creating a new position of Deputy Director for safety management- Clarifying responsibilities of relevant personnel and a command line
- Assigning a facility manager, a person-in-charge for a building, a radiation generator, and equipment for each facility, and assigning an alternate when they are absent-R eorganizing “Radiation Safety Meeting” to J-PARC Radiation Safety Review Committee (RSRC)
with new external experts- Setting up working groups under RSRC for thorough review of a specific item/issue- Clarifying criterions in operation manuals and relevant documents- I ntroducing “Alert Status” between existing “Normal Status”, and “Emergency Status” to properly
respond to an incident- Carrying out a drill for an emergency situation- Creating safety slogans and safety card in J-PARC- Providing continual safety education and training for both staff and users- Employing bidirectional education process for safety education- Carrying out a periodical review and upgrade of contents and procedures of safety education

Director of J-PARC

SafetyRadiation Protection
Supervisor
Linac, RCS, MR
MLF
HadronNeutrino
Person-in-charge
for accelerator

Deputy Director for
SafetyHead of
Safety Division

Facility
Manager

Radiation
GeneralSafety sent. Safety sent.

Person-in-charge
for building

Person-in-charge
for equipment

Radiation controlledarea manager

Fig. 6. New safety organization in J-PARC.

JAEA President

KEK Director General
Radiation Safetycommittee

Director of J-PARC Center
Radiation Safety Review
Committee

Inter lock system MLF target
WG
WG

Hadron target Operation
manual WG
WG

Fig. 7. Schematic of radiation safety review system in J-PARC.

Hadron Incident

J-PARC Annual Report 201310

Present Status and Outlook
The Hadron incident made us re-acknowledgedthat the safety is essential in the facility operation.
Therefore, the reinforcement of soundness of facilities,
equipment and the safety management system was of
the first priority for J-PARC Center to make J-PARC a safer
user facility. Along the above preventive measures, theEQ magnet system, target container, primary beamline
room, HD hall, and radiation monitoring system havebeen improved, and the work is almost completed. In
addition to the items listed in Table1, various upgrades
have been undertaken toward higher reliability andsafety of the J-PARC accelerator system. The new safety
management system became effective on October1,
2013, and new rules for the safety management were
put in enforcement on November1, 2013. Since then,education/training courses about the new safety management system and rules, and the safety culture werecarried out several times. Drills for an emergency situation, including a case of “Alert Status”, were conducted
at various facilities in collaboration with Nuclear Science Research Institute of JAEA.
On February 17, 2014 user operation at MLF wasresumed after about 9 months shut down [6]. Operation of MR for tuning started on March 24, 2014, andthe neutrino collaboration experiment, T2K, started on

April 26. The repair and improvement of the HD facility
have been conducted steadily.
At the end of September 2014, the damaged gold
target was safely replaced with a new target. The newtarget is placed in a new hermetically sealed chamber with improved structure for heat removal. The
improvement of airtightness of the primary beamline
will be completed in December, 2014. The HD facility is
expected to resume its operation following the completion of the reformation and the approval from relevant
authorities, local governments and residents.
References[1] J-PARC Center: http://j-parc.jp/ HDAccident /HDAccident-e.html.
[2] http://j-parc.jp/en/topics/20130812Accident_
Report.html[3] http://j-parc.jp/en/topics/HDAccident 20131117.
pdf[4] http://j-parc.jp/en/topics/HDAccident20131211.
pdf[5] HAGIWARA Masayuki, Proceedings of 2nd J-PARC
Symposium (July, 2014), Session S-15-PM1[6] http://j-parc.jp/en/topics/20140221director_message.html

Accelerators

Accelerators

J-PARC Annual Report 201312

Overview
In the beginning of fiscal year 2013, the rapid
cycling synchrotron (RCS) and the main ring synchrotron (MR) were delivering 300 kW proton beams to thematerial and life science experimental facility (MLF)
users and 220 kW to the Tokai-to-Kamioka (T2K) experiment, respectively. On May 13, 2013, the operation
mode of the MR was switched from fast extraction toslow extraction mode. The maximum beam power ofthe slow extraction mode until then was 15 kW. The
beam power was gradually increased in the accelerators
study in this period and reached to 30 kW in maximum.
User operation with 24 kW beam power was started on
May 18, 2013.
At around 11:55 on May 23, 2013, one of the spill
feedback quadrupole magnets, Extraction Quadrupole (EQ), malfunctioned. A beam consisting of 2×1013
protons was extracted within a very short time of
5 ms and delivered to the gold target in the hadronexperimental (HD) facility, whereas normally a total of
3×1013 protons were extracted for 2 s. The gold target
was instantaneously heated up to an extraordinarily
high temperature due to the short-pulse beam andpartially damaged. As a result, the radioactive material
dispersed from the gold target and leaked into the primary beamline room, because the target container was
not hermetically sealed. Since the airtightness of the
primary beamline room was not sufficient, the radioactive material leaked into the hadron experimental hall
(HD hall) and workers were exposed to radiation. Additionally, due to operation of the ventilation fans in the
HD hall, the radioactive material was released into theenvironment outside of the radiation controlled area ofthe HD facility.
Due to the incident, all of the J-PARC facilities
stopped the beam operation for seven months. The
operation of the linac was resumed in December, 2013,
after the long work on introducing preventive measures against similar incidents.
During the shutdown period, we investigated thecause of the malfunction of the EQ magnets in cooperation with the manufacturer of the EQ power supply.
As a result of the investigation, it was identified that a
primary failure occurred in part of the data transmission
system of the power supply. The setting value of themagnet current was not transferring correctly. This failure resulted from voltage drop in a circuit board of thevoltage power supply that supplies a fixed voltage of5 V to an interface board that converts an external input

signal. The EQ power supply had been operated without a failure since 2009. However, the circuit board of
the relevant power supply suffered aging degradation
due to insufficient preventive measures against overheating in a three-terminal regulator on the board and,
which led to the malfunction at the time of the incident.
To avoid the recurrence of the aging degradation, wechanged the configuration of the circuit board of thevoltage power supply to increase its heat capacity.
For a safe and reliable operation with a high power
beam, it is essential to adopt effective measures against
malfunction of the system. For this purpose, the following improvements on the EQ system were made:1) to stop the operation if anomalous current deviation is detected, 2) to shorten the shutdown time whenoccurrence of abnormality is detected, 3) to decrease
the maximum setting of the current value of the power
supply from 340 A (a maximum current of the power
supply) to 120 A, which is sufficient for routine users
operations.
On the other hand, various improvements of theaccelerators have been performed during the long
shutdown period. Most improvements were originallyplanned before the incident. The energy upgrade ofthe linac is one of the most important of them. We
have installed a new accelerating structure system, theannular-ring coupled structure (ACS) linac, to increase
the beam energy from 181 MeV to the full energy of
400 MeV. For the beam injection of the RCS at 400 MeV,
all of the power supply of four shift-bump magnets was
replaced with newly manufactured ones.
For the MR, upgrade of the ring collimator system
and replacement of a part of the beam duct were themain improvements. Four additional collimator units
and additional iron shield walls were installed just in thedownstream area in the beam injection section of the
MR to increase the beam loss capacity of the collimator system from 2 kW to 3.5 kW. A part of the quadruple
and sextupole beam ducts made of stainless steel was
replaced with new ones, made of titanium, to reduce
the residual radiation dose.
The beam commissioning of the linac with the ACS
system started in December, 2013. The designed beamenergy of 400 MeV was achieved in January, 2014. The
beam commissioning of the RCS with linac beam of
400 MeV started in the same month and the 400 MeV
injection beam was accelerated to 3 GeV in February,
2014. The user operation of the MLF resumed on Feb-

J-PARC Annual Report 2013

Accelerators

13
ruary 17, 2014 with beam intensity of 300 kW after thenine-month beam shutdown. For the MR, beam study
restarted on March 24, 2014. The injection beam fromthe RCS was accelerated to 30 GeV and extracted by

the fast extraction system to the abort beam dump on
March 30 for the first time after the incident in the HD
facility.

LINAC
The J-PARC linac power upgrade program is now inprogress in parallel with the user operation. To realize thenominal performance of 1 MW at the RCS and 0.75 MW at
the MR, we need to upgrade both the energy (400 MeV)
and the peak beam current (50 mA) of the linac.
For the energy upgrade, we installed ACS cavities(Fig. 1) and 972 MHz klystron system (Fig. 2) during thesummer shutdown in 2013. The installation work wascompleted on schedule in spite of only three months
allotted to the installation because the upgrade ofrelated systems such as a waveguides, cables, cooling water system and so on started in 2010 during theannual summer maintenance period. The beam commissioning of the linac started in December, 2013, andthe designed beam energy of 400 MeV was achievedin January, 2014. Thereafter, we performed additional
beam study to reduce the beam loss. The transverse
beam profile at the ACS exit shows a significant beam
halo which is supposed to come from the longitudinalmismatch at the ACS entrance. We think that this halo
can be mitigated by a longitudinal matching. After the
linac beam commissioning, the beam tuning of the RCS
started. The tuning result showed that the beam loss
at the beam injection area decreased significantly byincreasing the incident energy from 181 MeV to 400
MeV. It was confirmed that the energy upgrade wasquite effective to reach a beam power of 1 MW.
The user operation of the MLF resumed in February,
2014 with a beam power of 300 kW using a linac output peak current of approximately 15 mA. During theoperation, some failures such as discharge of a klystron,
malfunction of high voltage power supply for the klystron and instability of cooling water flow level occurred.
In February, 2013, the klystron for DTL2 was
replaced with a brand-new one because frequent discharges between the anode and the body occurredat the klystron. This was the first replacement with aspare since the operation started in November, 2006.
Subsequently, the klystron for SDTL13 was replaced in
February, 2014, because the klystron was incapable ofsustaining the required voltage. We think the klystron

may be approaching the end of its life because it has
been in operation for over 30,000 hours as of March,
2014.
A high voltage transformer (HVTR) of the klystronpower supply #2 was broken in December, 2013. The
failure was caused by destruction of the diode moduledue to sudden voltage overload, which was the same
situation as when the HVTR#1 was broken in March,2012. As a countermeasure, we consider the installationof some surge absorbers at the input terminals of the
HVTR.
For the beam current upgrade, we plan to replace
the ion source and the Radio Frequency Quadrupole

ACS cavity

Fig. 1. ACS cavities installed in the accelerator tunnel.

Circulator

Wave guide(WR-975)

Klystron

Anode
Modulator

Fig. 2. 972 MHz klystron system for the ACS cavity.

Accelerators

J-PARC Annual Report 201314
linac (RFQ) during the summer shutdown in 2014.
The prototype cesiated RF-driven Hˉ ion source satisfied the upgrade requirements of an Hˉ ion beam currentof 60 mA with a flat top beam duty factor of 1.25%.
We need to replace an RF antenna, an end-flange, aplasma chamber and the plasma electrode periodically to prevent unscheduled beam stop due to theirfailure. To perform the replacement work efficiently,
the replacement elements were unitized to allow dismount and mount in bulk. Moreover, in order to install
the unitized source on the beam line by hand, a lowweight material was needed, so we adopted stainlesssteel (SS) for the plasma chamber instead of the nickelplated OFC used in the prototype source. We confirmedthat the SS plasma chamber source had the same beam
performance as that of the prototype source.
A test stand has been constructed to perform the
new RFQ beam test before installation. The conditioningof the RFQ was conducted, and after 20 h of conditioning, the RFQ became very stable with a nominal peak
power and duty of 400 kW and 1.5%, respectively. The

beam test was subsequently conducted, and the peakbeam current of 50 mA with the pulse length of 50 μs
and the repetition rate of 25 Hz from the RFQ was successfully demonstrated on February 6, 2014 (Fig. 3).

Fig. 3. W aveforms of the beam current measured at the ion
source exit (LEBT) and the RFQ exit (MEBT).

J-PARC Annual Report 2013

Accelerators

15

RCS
The RCS was also severely damaged by the earthquake on March 11, 2011 and the beam operation was
shut down. The main magnets and other components
were displaced by the earthquake, but we didn’t perform realignment of these components, because therapid restart of the user operation had a priority overtheir realignment. Since this displacement caused abeam loss in the beam power of more than 400 kW,
the realignment of those components was essential torealize higher beam power and stable operation. On
the other hand, to achieve the nominal performance of
1 MW at the RCS and 0.75 MW at the MR, the full energy(400 MeV) and higher peak beam current of the linac isnecessary for the J-PARC facility. The linac has upgradedits energy from 181 MeV to 400 MeV with the new ACS
linac. These two heavy tasks, which were the realignment and the 400 MeV beam injection upgrade in the
RCS, were done at same time (from July to December
in 2013). At the same time, we had the challenge toachieve higher beam power operations with better stability. This paper deals with the RCS status and progress
for this one year.
(1) OPERATION FOR THE USER PROGRAM
The RCS could deliver beam whose power was
300 kW to both the MLF and the MR for their user
operation with an average availability of more than
95% before the linac energy upgrade. The user operation resumed from February 17, 2014, with a 110 kW
beam only for the MLF after the linac beam energy
upgrade (400 MeV injection). The beam power gradually increased, and then reached 300 kW for the MLF
users on February 27, 2014. Since the MR started theuser operation for the neutrino experiment from midMay, the RCS also started to deliver beam with powerof 300 kW to both the MLF and the MR. The availabilityof the beam delivery after 400 MeV injection was not
so high at first because several kinds of devices, forexample newly installed power supply, oil cooling system for power supply, and so on, stopped for one day
and more, but this situation improved and the delivery
reached more than 90% at present.
(2) MAINTENANCE AND IMPROVEMENTS
Realignment and preparation for the 400 MeV
injection were the main task in this maintenance period.
The details of those works and several progresses aredescribed in this section.

1) Realignment of RCS
To minimize the amount of realignment work,
we decided that not all components should move todesigned regular positions. The components, whichshould be aligned, were chosen to be secured thedesign acceptance 486 π mm mrad. Almost all components, which were main magnets, RF cavities, andextraction magnets, had to be moved in the range of~17 mm for horizontal, ~4 mm for vertical and ~10 mm
for longitudinal, respectively. Ceramics chambers werealso moved to the center of the magnet. It was not necessary for the components installed in injection straightline to move because the displacement of these components was less than +/-0.2 mm. The positions of themagnet, RF cavity and other components were measured by laser tracker and adjusted within +/-0.2 mmcompared with the design value. This work was successfully completed on schedule by a total manpowerof 2200 person-day.
2) Replacement of ceramics chambers and capacitors
The withstand voltage of the capacitor is 250 V,
which is lower than the voltage induced by the shift
bump magnet. That is why capacitors were broken
down during the shift bump magnets operations. Morethan 90% capacitors cutoff in situ were to escape broken of the ceramics chamber due to discharge of thecapacitors. Since this effect disturbed the balance in theconfiguration of the RF-shield, this condition caused
kick field to the beam due to dipole field induced in
the RF-shield by eddy current of the bump field. The
reason why this work was conducted is that the symmetric configuration of the RF-shield was important to
reduce the beam loss. Ceramics chamber was installedin each shift bump magnet, and there was a total of four
ceramics chambers in this area. Two ceramics chambers
were replaced with new ones and only capacitors were
replaced with new high withstand voltage ones foranother two ceramics chambers, because there were
not enough spare ceramics chambers.
3) Improvement of charge exchanger #2 and #3
There were three charge exchangers in the injection area for H− beam injection from linac. Since charge
exchanger #1 was mainly used for charge exchange, its
design was convenient to maintain, on the other hand,
there were some issues with the maintenance of charge
exchangers #2 and #3 because their configuration wasAccelerators

J-PARC Annual Report 201316
very simple. These charge exchangers were replacedwith new ones, in which those issues have been solved.
4) Vacuum condition improvement in the injectionline
The inner periphery of the injection branch of the
RCS had a high activation level which was a few mSv/hon the surface of the vacuum chamber measured 4hours after of stopping the beam for the user operation. The user operation has been performed with abeam power of 300 kW for 3 weeks. This high activation was due to H0 beam, whose electron was strippedby the molecules in the beam pipes during the beamtransportation through the beam transport line fromthe linac to the RCS. They were not bent by the injection magnets and hit a wall in the vacuum chamber. To
solve this issue, two vacuum pumps were additionallyinstalled in this area.
5) Installation of new scrapers in the injection beamline
Small size beam injection by removing the beam
halo is essential to reduce beam loss at the injection
area, especially downstream of the charge exchange
foil and the injection dump in the RCS. However, theprevious scraper for halo reduction, which was installedin the beam transport line from the linac to the RCS,
was not useful, because the scraper produced beamloss downstream of it due to large angle scattering
caused by too thick scraper head. To solve this issue, we
installed a new scraper with optimized head to mitigate
the radiation around it.
6) Replacement of MA cores and new cavity installation
We have been replacing the old magnetic alloy (MA)cores with buckling-free type ones for 2 cavities during
this maintenance period. Replacing MA core work wasdone for a total of 9 cavities. A new cavity was installed
this year, which increased the number of the cavities to
12, the designed number for the RCS. At present all 12
cavities work well.
7) Preparation for correction Q-magnets
To correct an unwanted edge focusing effect due tothe injection bump magnet and a tune during the beam
acceleration period of 20 ms, correction quadrupole
magnets (QDTs) have been developed. A total of 6 QDTs
and their beam pipe made by alumina ceramics were
installed in the RCS. The cabling between their magnets

and power supply was also finished. The power supplies
are under construction at present and this correction
system will be operated from this autumn.
The corrective dose for each work operation is summarized in Table 1. Many people, max. ~100 persons perday, worked in the RCS tunnel on maintenance, however, the corrective dose was not so high. Our radiation
protection and control for each worker worked well andthe RCS tunnel was clean.
Table 1. Corrective dose for each work operation.
work
Realignment
Replacement of ceramics
chamber and capacitors
Improvement of charge
exchanger
Monitor maintenance ininjection area

50

Personal
maximum
exposure dose
[µSv]
20

1467

300

234

60

420

170

Corrective
dose [µSv](3) 400 MeV BEAM INJECTION AND ITS EFFECTS
To achieve the nominal performance of 1 MW at the
RCS and 0.75 MW at the MR, the full energy (400 MeV)
and a higher peak beam current of the linac are necessary for the J-PARC facility. The linac has upgraded its
energy from 181 MeV to 400 MeV with the new ACS
linac. At the RCS preparation for 400 MeV injection,
beam commissioning and user operations have been
carried out.
The new power supply for injection shift bumpmagnet (SB) was designed to accept 400 MeV beamfrom the linac. The cause for beam loss of the RCS is theexcitation of coherent beam oscillation due to the SB
induced dipole ripple. Figure 4 shows the beam position change due to the SB induced dipole ripple bothfor the previous and the new power supply. In the previous power supply and original RF-shield with lack of
capacitors, the beam position changed by more than+/- 2 mm. On the other hand, in the new power supply
and modified RF-shield without the lack of capacitors,
the beam position in the flat top was stable. The beam
position changed +/- 1.5 mm for the horizontal only instarting ramping down of the field. This result showsthat the new power supply works very well, however, astable operation has not been achieved yet.
Beam commissioning with injection energy of
400 MeV was started from January 30, 2014 without

J-PARC Annual Report 2013

Accelerators

17
acceleration to tune and adjust injection parameters at
first. Adjustment, tuning and measurements for injection, acceleration and extraction have been performed
during the beam commissioning operation for two
weeks, and a high intensity beam trial was also carriedout. An equivalent beam power of 560 kW with a beamloss of only 0.3% was achieved in a short time for thishigh intensity beam study.
By the commissioning after the shutdown, the300 kW operation condition was established. In thiscondition, the doses of most areas were kept at thesame level as the 181 MeV injection energy operation
or decreased except to the injection foil chamber, with
100 degrees and H0 dumps. The first results from theuser operation with the new injection energy indicatedthat the residual dose on the vacuum chamber of thecharge exchange foil became higher, the residual doses
near the injection H0 dump were increased by the haloof the injection beam, and the dose at the injection septum magnet was reduced due to improvement of thevacuum pressure in the beam transport line from thelinac to the RCS and higher injection energy.

“Old” SB power supply& “Original” RF-shielding
with the lack of capacitors

Flattop
3“New” SB power supply& “Modified” RF-shielding
without the lack of capacitors

Fall time

Flattop Fall time3

Horizontal

2

1

0
-1
-2

3

0

0.2

0.4

0.6

0.8

1

1.2

Vertical2
10Beam position (mm)Beam position (mm)

1

-3

0
-1
-2
-3
3

-2
0.4

0.6

0.8

Time (ms)

1

1.2

0.4

0.6

0.8

1

1.2

0.4

0.6

0.8

1

1.2

0

-2
0.2

0.2

1

-1

0

0

Vertical2-1-3

Horizontal

2

-3

0

0.2

Time (ms)Fig. 4. Beam position change due to SB induced dipole ripple for both the previous and the new power supply.

Accelerators

J-PARC Annual Report 201318

MR
The operation of the MR was also upset by a radioactive material leak at the Hadron Experimental Facility.
On May 23, 2013, the control of the EQ power supply
malfunctioned, which led to the extraction of 2 × 1013
protons to the gold production target during a 5 mslong pulse. The very short pulse melted and evaporated
the target material and caused radioactive contamination in the Hadron hall and its surroundings.
Prior to this incident, the MR had achieved thebeam power of 240 kW for the fast extraction, and
24 kW for the slow extraction. In particular, the slow
extraction provides a “duty factor” of 43% at 24 kW and
99.5% extraction efficiency. A study demonstrated asmuch as 30 kW slow extracted beam delivered to thetarget. However two serious problems occurred in the
MR before the succession of the slow extraction of
30 kW beam. The first was an issue with the low-field
septum magnet for the SX system. This was discoveredon March 14, 2013, when the septum magnet showed alarge, unexpected beam loss. It eventually became clearthat a septum conductor was deformed and obstructed
the beam. Its conductor was made of a 1 mm-thick copper plate. The cooling water pipe had torn off from theseptum conductor, and the heat induced by the beam
was not being removed, causing the thermal extensionof the conductor to deform. This problem was fixed
by replacing the conductor, and the beam operation
restarted on April 27, 2013. Another issue was a waterleak from the hollow conducting coil of the injection
septum magnet. It was found on May 8, 2013, and theoperation resumed on May 13, after repair.
Immediately after the incident, a number of proposals were presented to prevent the extraction of a shortintense beam pulse to the target in the hadron hall,
including limiting current excursions of the EQ power
supply. These improvements would address not just a
malfunction of the EQ power supply but also other possible scenarios such as a pre-fire of the beam abort kickers. For the EQ power supply, the following measures
were taken with regard to other probable risks:(1) Add items to stop output current;a. tracking error (5% of 340 A),
b. error bit and abnormal strobe of digital signalsc. external interlock(2) Lower current trip limit(3) Fast interlock system(4) Check tracking Error between DSP Set Value andOutput Current.

During the long shutdown after the hadron incident, the following jobs were completed to increase
the beam power:(1) The injection collimation system was modified
by the installation of 4 additional short collimators resulting in a beam loss capacity of 3.5 kW,
increased from 2 kW. The configuration of the collimators is shown in Fig. 5.
(2) The stainless-steel beam ducts were replaced withtitanium ducts to reduce residual activation.
(3) The waveform of the injection kicker was improved
by applying a matching resistor. It is shown in Fig. 6.
(4) The repetition period of the MR was 2.48 s for the
FX mode just before the hadron incident. At present, a period of 2.40 s is being tested by modifications to the magnet power supplies.
As the almost jobs described above were completed before the end of JFY2013, the beam study of
MR was resumed in April, 2013. In the near future, theMR must increase the power of the fast extracted beam
to 750 kW from the present 240 kW. Thus, the immediate challenge lies in improving the beam loss handlingin the MR. The followings are potential corrections foraddressing this issue:
12

3

3 Collimators

2011
2012
2014

1

2

3

4

Short-type(red): 2+ Legacy(pink): 2

5

6

7 7 Collimators

Short-type(red): 6+ Legacy(pink): 1

Beam Loss Capacity: 3.5kW

Fig. 5. Configuration of the MR injection collimators.
Top: The change of the collimator layout.
Bottom: Comparison of the injection area before andafter the installation of the last collimators. The left
picture corresponds to the layout in 2012. The legacy
means the originally installed collimators.

J-PARC Annual Report 2013

Accelerators

19

Normarized Kicker Current(1) Shortening the repetition cycle to 1.3 s. To achievethis, the magnet power supplies and RF cavities will
be replaced. Beam simulation of the MR operation
at high beam power is ongoing.
(2) To generate a 1.3 s repetition cycle, new magnet
power supplies utilizing capacitive energy storage are now in development. These provide all
the required magnetic energy, around 1 MJ for
one bending family, from the capacitors. Halving
the load-per-supply and using three choppers inparallel addressed the requisite increase in ramp
rate. Precise output current control, with a current
ripple of less than 10-6 at the flat top and precise
tracking, will be achieved by shifting the phase andlow-noise digital control. An example of the measured result for the developed small power supply
is shown in Fig. 7.
(3) New RF cavities with FT3L cores will allow for thenecessary voltage for acceleration in the MR witha 1.3 s repetition period without building new RF

amplifiers. The 9 cavities with 3 gaps each will ultimately be replaced by 7 cavities with 5 gaps andtwo cavities with 4 gaps.
(4) To reach the required intensity for the 750 kW operations, the anode power supplies of the cavities willneed additional power units to bring their output
from 840 kW to 1.2 MW.
(5) Mass production of the FT3L cores began commercially in May, 2013. The construction of two cavities
with 4 gaps and two more with 5 gaps was launchedduring JFY 2013. The first one will be delivered on
March 25 and checked in the test array before its
installation into the ring during the summer shutdown. All remaining cavities will be installed during
JFY 2016. Figure 8 shows the upgrade plan for the
new FT3L cavities.
(6) A second harmonic cavity for relaxing the spacecharge effect of the bunch is in construction, using
air-cooling and Finemet cut cores. It will be tested
during the spring of 2014.

1

Measured pulse shape

0.8

InjectingBeam
Bunches

0.6
0.4

⑤

⑥

⑦

Circulating Beam Bunches

⑧

①

0.2

②

③

A

④

⑤

B

0
-1

+HV (50kV)

0

R match = 9.3Ω1

PFL (140m)

2

3

Thyratron(e2V CX1193)

5µsTransmission Line (170m)

Capacitor
7 nF 3.5 nF

Matching
Resistor(140Ω)

L

C

R1

R2

1

10

320ns@99%
0.8

10

2013

0.6

(Iref-Imeas.)/Iref

Fraction of current

4

2014

0.4

10
10
10
10
10

0.2

10
0
0

1

2

3

4

5

×10
6
time (sec)-6

Fig. 6. Waveform of the injection kicker magnet.
Top: Measured original waveform. Tail shown as A and B
makes the beam loss by kicking the circulating beam.
Bottom: Improved waveform by adding the matching
resistor and changing the capacitor.

-3
-4
-5

1ppm

-6
-7
-8
-9

-10

10

1

10

2

10

3

Frequency (Hz)10

4

Fig. 7. Developed small power supply.
Top: Circuit diagram of the power supply for the sextupole magnet.
Bottom: Measured current deviation from the reference value.

Accelerators

J-PARC Annual Report 2013

20

Fig. 8. FT3L cavities & upgrade scenario.
Top: RF cavity upgrade configuration.
Bottom: New FT3L cavity with 4 gaps.

Materials and Life Science
Experimental Facility

Materials and Life Science Experimental Facility

J-PARC Annual Report 201322

Overview
In JFY2013, the beam operation at MLF started witha beam power of 300 kW. The scheduled time and availability are shown in Table 1. We had a good start withhigh availability in Run#48, and then the incident at the
Hadron Facility occurred in Run#49. Due to this incident,
all user programs in 2013A, including the on-beamtraining of AONSA neutron school that was scheduled
for June 18-19, were cancelled without carrying over.
After the installation of the 400-MeV superconducting
LINAC and beam studies in Run#50 and #51, the user
beam operation started with a beam power of 100 kW
on February 18, 2014, and resumed with a power of
300 kW on February 28. The number of neutron users in
JFY2013 decreased to 520 compared to that in JFY2012(735) because the total beamtime allocated to users
was reduced by the incident at the Hadron Facility,
while the number of muon users slightly increased to
77 from that in JFY2012 (72).
Regarding the status of beamlines, the user programs of neutron and muon science were carriedout at 17 and 2 instruments, respectively, in JFY2013(Fig. 1). BL09 (SPICA) is still in commissioning phase.
BL11 (PLANET) was introduced as a public beamline to be used in the user program from 2013B, after
completion of the commissioning work in 2013A. At
the neutron facility, construction of three new neutron
instruments, BL06 (VIN ROSE), BL22 (RADEN) and BL23
(POLANO), has progressed. VIN ROSE, which is installed

by Kyoto University and KEK consists of a neutron resonance spin echo (NRSE) instrument and a modulated
intensity by zero effort (MIEZE) one. The guide mirrors
and downstream concrete shielding were installed in
JFY2013. The installation of the shielding of BL22 wascompleted in this fiscal year. Other components, suchas optical devices and a rotary collimator, were also
installed. POLANO is constructed under the joint project
between Tohoku University and KEK. Its construction
started in JFY2013 when the supplemental budgets
were approved for both institutes. The basic designand construction of the shielding were completed. The
U-Line has been constructed since the last fiscal year,
and is currently under commissioning. In JFY2013, theconstruction of the S-Line has started. The main beamline components to direct the muon beam toward theS1 experimental area, such as the quadrupole magnets
and DC separator, have been manufactured.
In MLF, whole operation manuals and accident
response were revised and several kinds of safety drills
were carried out after the incident at the Hadron Facility. Furthermore, most of the instrument scientists andengineers in MLF and CROSS were qualified to join theshift leader team as the sub-shift leader. This is a newly
introduced position for assisting the shift leader, who isa person in charge of the MLF operation. The sub-shift
leader has the same responsibility along with the shift
leader.

Table 1. Beam statistics for the MLF user program in JFY2013.

Run#

Scheduled Time (h)Availability

48

250

99.0%

49

993

58.6% *150

No time for users

51

No time for users

52

889

86.2%

Overall

2132

74.8%

(*1 Due to the incident at the Hadron Experimental Facility.)J-PARC Annual Report 2013

Materials and Life Science Experimental Facility

23

Neutron Instruments
BL
BL01
BL02
BL03
BL04
BL05
BL06
BL08
BL09
BL10
BL11
BL12
BL14
BL15
BL16
BL17
BL18
BL19
BL20
BL21
BL22
BL23

Name of Instruments
4SEASONS: 4D-Space Access Neutron Spectrometer
DNA: Biomolecular Dynamics SpectrometeriBIX: IBARAKI Biological Crystal Diffractometer
ANNRI: Accurate Neutron-Nucleus Reaction measurement Instrument
NOP: Neutron Optics and Fundamental Physics
VIN ROSE: VIllage of Neutron ResOnance Spin Echo spectrometers
SuperHRPD: Super High Resolution Powder Diffractometer
SPICA: Special Environment Neutron Powder Diffractometer
NOBORU: NeutrOn Beam-line for Observation & Research Use
PLANET: High Pressure Neutron Diffractometer
HRC: High Resolution Chopper Spectrometer
AMATERAS: Cold-Neutron Disk-Chopper Spectrometer
TAIKAN: Small and Wide Angle Neutron Scattering Instrument
SOFIA: Soft Interface Analyzer
SHARAKU: Polarized Neutron Reflectometer
SENJU: Extreme Environment Single Crystal Neutron Diffractometer
TAKUMI: Engineering Materials Diffractometer
iMATERIA: IBARAKI Materials Design Diffractometer
NOVA: High Intensity Total Diffractometer
RADEN: Energy Resolved Neutron Imaging System
POLANO: Polarization Analysis Neutron Spectrometer

Moderator
Coupled
Coupled
Coupled
Coupled
Coupled
Coupled
Poisoned
Poisoned
Decoupled
Decoupled
Decoupled
Coupled
Coupled
Coupled
Coupled
Poisoned
Poisoned
Poisoned
Decoupled
Decoupled
Decoupled

StatusAvailable to users
Available to users
Available to users
Available to users
Available to users
under construction
Available to users
commissioning
Available to users
Available to users
Available to users
Available to users
Available to users
Available to users
Available to users
Available to users
Available to users
Available to users
Available to users
under construction
under construction

Muon Instruments
BL
D1
D2
U Line
S LineName of Instruments
D1 Instrument
D2 Instrument

Fig. 1. Status of the neutron and muon instruments at MLF.

StatusAvailable to users
Available to users
under construction
under construction

Materials and Life Science Experimental Facility

J-PARC Annual Report 201324

Neutron Source
Progress of the Neutron Source Section (H. Takada)In 2012, we started supplying helium gas microbubbles in the running mercury circulation loop, which
mitigates pressure waves generated in the mercury target by injecting intense proton beam, and confirmedthat the vibration velocity on the target vessel initiatedby the pressure waves was decreased for the first time in
the world. However, the flow rate of helium gas did notreach the rated value because mercury was unexpectedly intruded from a vent line to a helium supply line
through a surge tank. During the maintenance period in
JFY2013, we removed the mercury from the helium gas
supply line by hands-on work and installed a gas-liquid
separator as a counter measure. We also replaced thehelium gas supply device with a new one with remotehandling tools such as a master-slave manipulator andan in-cell crane. As a result, the flow rate of gas microbubbles in the mercury was successfully increased from
2.5 l/min to 7.5 l/min, suppressing the vibration velocityof the target vessel by 1/3 to 1/4.
Flattening the proton beam profile is another effective technique to suppress the pressure wave. Since
the current proton beam profile has a Gaussian distribution, we have installed two octupole magnets tosuppress the beam profile upstream of the muon production target in the 3 GeV proton beam transport line.
We investigated the performance of the octuplole magnets during the accelerator study period in February,
2014, and obtained a promising result, confirming thatthe peak of the proton beam profile has been reduced
by about 40%. At the 3 GeV proton beam transport line,
we replaced the proton beam window installed to create the boundary between the high vacuum environment in the transport line and the helium environment

in the helium vessel, in which the target-moderatorreflector system is placed.
We also replaced the accumulator of the cryogenic
super-critical hydrogen circulation loop during themaintenance period. It has a bellows structure enclosing helium to make its volume variable up to 6.85 L sothat it could control the pressure rise in the hydrogen
loop induced by nuclear heating of 3.8 kW at the moderators when the 1-MW pulsed proton beam injects or
stops. The new accumulator has a diameter of 300 mm
and unrestricted length of 85 mm, the same specifications as for the current one. As the bellows consists of
5 blocks of welding bellows with 17 units in each ofthem, the plate thickness was increased from 0.4 mm
to 0.8 mm in order to withstand a high pressure of
2.0 MPa. The consequently manufactured bellows can
expand and contract smoothly without hysteresis. We
also confirmed through actual operation with a 300 kW
proton beam that the pressure rise in the cryogenic
super-critical hydrogen loop was mitigated at 20 kPa
and it could reach 60 kPa for the 1 MW operation, which
satisfied the design requirement.
The neutron shutter system of J-PARC is driven by
an electric servo motor. Since the operational beam
power increased up to 200 kW in 2011, a failure indicating servo motor error occurred randomly several times.
We found that it was caused by a single event effectat the semi-conductor part of the servo amplifier byneutrons produced at the target-moderator-reflector
system. Therefore, all servo drives of the shutter system were replaced to the robust type, which does notinclude semi-conductors.

Modification of the MLF General Control System for Sustainable Long-Term Operation (K. Sakai et al.)The outline of the General Control System (GCS)in MLF in 2013 is shown in Fig. 2. It consists of several
subsystems such as an integral control system for controlling muon and neutron targets, interlock system,
servers, networks, and timing distribution system. Theinterlock system consists of subsystems named MPS(Machine Protection System), TPS (Target Protection
System) and PPS (Personnel Protection System). We

have modified this system to match the device upgradeof the target systems to ramp up the proton beam
power and increase the user apparatuses year after year.
The control and interlock system is operated bymonitor and operation (MO) systems, which consistof administrative control PCs (ACP), PPS operating PC,
interlock monitoring PC (IM-PC), and so on in Fig. 2.
Since 2012, we have developed prototypes to upgradeJ-PARC Annual Report 2013

Materials and Life Science Experimental Facility

25
the MO system both for the integral control system
and PPS. After confirming that they work properly as
designed, in 2013 we built two full-scale upgradedMO systems. One is the MO system, which controls thedevices for the target stations by using more than 130
operation screens and acquires operation data about
7000 items every second. The other is the system,
which administers the PPS devices by using 6 screensand acquires data about 1400 items. They have been
operated in parallel with the current systems during
beam operation and maintenance for over half a year,
and debugged in comparison with the correct ones for
replacement until 2014. The MO system for the PPS was
already replaced completely by the upgraded one in
the end of 2013.

Fig. 2. Outline of the MLF-GCS in 2013.

Materials and Life Science Experimental Facility

J-PARC Annual Report 2013

26

Neutron Science
Doping-Evolution of High-Energy Spin Excitation in the Electron-Doped
Pr1.4-xLa0.6CexCuO4 (M. Fujita et al.)In the research of high-transition-temperature
superconductivity, the evolution of the spin excitation
with doping is a fascinating and long-standing issue.
A doping dependence of spin excitations separated
by the energy region is one of keys to understanding
the role of magnetism in the mechanism of superconductivity, as reported on Mott insulator La 2CuO4 or
YBa2Cu3O6. In contrast to the progressive research in
the hole-doped system, less is known about the entire
spin excitation in the electron-doped cuprates. Fujita
and Wilson separately observed the spin excitation up
to ~ 200 meV in the superconducting (SC) sample andclarified a steeper excitation along the energy direction

Pr1.40-xLa0.60CeCuO4-y
Intensity (ard. unit)

1.0

0.5

0

(a) x=0300

200

than in the undoped compound. This result suggests
an increase of zone boundary energy by the electrondoping, unlike to the doping-independent high-energy
dispersion in the hole-doped system. However, even in
the parent compound, measurement of high-energy
spin excitation up to the zone boundary is still missing. In order to confirm the electron-doping dependence of spin excitation and gain an insight into theelectron-hole symmetry in the spin correlation, we performed neutron scattering measurement on a series of
Pr1.4-xLa0.6CexCuO4.
Inelastic neutron measurements were carried out
on as-grown single crystals of x = 0, 0.08 and 0.18, which
are non-SC, at BL01 (4SEASONS). As shown in Fig. 3, welldefined spin-wave excitation emerging from h = 0.5 wasobserved in the x = 0 sample. The zone boundary energy
determined from the dispersion is ~320 meV. The intensity lying at ~100 meV in a wide momentum range corresponds to a crystal field excitation from Pr3+ ion. The
high-energy excitation shows a drastic doping evolution, that is, the magnetic excitation gets steeper withω100(b) x=0.08

ħω (meV)300

280meV

200

-1

100

-0.5

0

0.5

1 h (r.l.u.)(c) x=0.16

300

200

100
0

0.5

1.0

h (r.l.u.)

1.5

2.0

Fig. 3. Spin excitation spectrum in the Pr1.4−xLa0.6CexCuO4
with (a) x=0, (b) 0.08 and (c) 0.18. To enhance thehigh energy excitation, the value of energy transfer
was multiplied to the intensity after subtracting thebackground.

Intensity (arb. unit)

0.015

x=0.18

ω=280±20meV(h 0.5±0.1)
0.010

x=0.08

0.005

0

x=0
-3

-2

-1

0

h (r.l.u.)

1

2

3

Fig. 4. ( Upper) Image of the doping evolution of spin excitation suggested from the present study.
(Lower) Constant energy spectra sliced at 280 meV.

J-PARC Annual Report 2013

Materials and Life Science Experimental Facility

27
increasing the Ce concentration. Slicing the maps at
280 meV along h-direction through (0.5, 0.5) reciprocal
position (Fig. 4), the magnetic intensity in x = 0 shows
peaks at the h = 0 and ±1 while the main peaks locate
at h = ±0.5 in x = 0.18, indicating the elongation of themagnetic excitation toward the high-energy region.
This trend is in stark contrast with a negligible doping
dependence of high-energy spin excitation in the holedoped LSCO. Thus, there exists electron-hole asymmetry in the spin excitation against doping.

a) Magnetization // Xb) Magnetization // Z

50

50

40

40
Y axis (ch)Y axis (ch)Visualization of Magnetic Field Distribution by Polarized Pulsed Neutron Imaging Inside the Power Magnetic Instruments (T. Imagawa et al.)3020c) Hysteresis loop
1.5L

B(T) 1.0

T
L

0.5
30

H(A/m)

0.0
-200

20

-100

0

100

-0.5
10
0

10

Magnetic vectors in XYplane
0

10

20

30
X axis (ch)

40

50

0

0

Magnetic vectors in XZ plane

-1.0

10

-1.5

20

30

40

50

Y

X

T

X axis (ch)Fig. 5. Magnetic domain observation by polarized pulsed neutron imaging.

The loss reduction of power magnetic instruments,
such as motors and transformers is the urgent problem
for retardation of global warming because the loss
produces heat increase. In order to reduce the loss wehave to design these instruments properly, however, wehave very few methods to inspect the design directly.
In power magnetic instruments both the performancesof magnetic materials and the magnetic field designs
are important. The polarized pulsed neutron imaging
developed in MLF should be able to visualize both the
distribution of the material magnetization and themagnetic field, so it is a promising method for magnetization analysis. An expected application is the motor
analysis, by measurement of both the motor gap
magnetic field and the motor core magnetization. The
polarized pulsed neutron imaging in MLF is carried out
at BL10 (NOBORU). Among magnetic materials for the
motor core, amorphous films are expected to reducethe core loss significantly because of their small coercive forces. But they also have extreme sensitivity to
the stress produced in motor fabrication that degrades
their performance. The degradation could be reduced
if the magnetic moments motion inside the motor core
be visualized.
Figure 5a) and 5b) show the magnetic moment
distribution of the annealed amorphous foil of 25 µm
in thickness measured by the polarized pulsed neutron
imaging experiments. The results should reflect its

residual magnetization state. Figure 5a) shows the
distribution of magnetization components along thehorizontal direction (parallel to the X axis), where redcolor means a positive sign and blue is a negative one.
Also corresponding magnetization vectors in the XY
plane, which lies in the foil plane and the X axis is along
the horizontal direction, are indicated by arrows. All thevectors are almost oriented in +Y direction (upward inthis figure), but they incline to the left/right in the red/
blue area. These areas can be recognized as “magnetic
domains”, and their shape change by applying
magnetic field is connected directly with the magnetization process. Our results are consistent with that of
the hysteresis loops, which suggests that the easy axis
is oriented to the L (Y) direction (Fig. 5c)). On the other
hand, Fig. 5b) shows the distribution of the magnetization component parallel to the beam propagation
direction (Z axis), which is normal to the foil surface,
and the arrows in this figure indicate magnetic vectors
in the YZ plane. Similar magnetic domain structureas Fig. 5a) was observed. This indicates the presenceof perpendicular magnetization due to the perpendicular magnetic anisotropy. While this magnetization
component is known as the reason for the degradation of magnetic performance, the presence of sucha magnetic component inside the foil was confirmed
experimentally for the first time.
Figure 6 shows the result of the motor gap obser-

Materials and Life Science Experimental Facility

J-PARC Annual Report 201328
vation. Figure 6a) shows the model motor fabricatedas frame-less type so that the motor gap is open andobservable by the eye. On the rotor surface 4 crescenttype magnets are stuck and the stator consists of 15 yoke
teeth with coils wound by distributed type. Figure 6b) is
the gap field in absolute value calculated without thecoil current. At the center of the gap the maximum
magnetic field intensity was 5 kOe. Figure 6c) shows
the neutron transmission image of the motor sample.
The opaque area at the center of this image correb) Calculated gap field
Electricalsteel sheetsc) Transmission imaged) Polarization image

150

180 Neutron Spin // Y axis

Gap

Tooth
Magnet

160
140

100
Y (mm)a) Model motor

sponds to the rotor, and the surrounded ring-shaped
bright area does the motor gap. The polarization imageof the motor is shown in Fig. 6d). The neutron spin wasalong the Y axis. At both sides of the rotor, neutron
polarization kept the initial value, but it turned to zeroin the other area. This result indicates that neutron spin
direction is parallel to the magnetic field at the bothsides of the rotor that corresponds to the calculated
field direction.

50

120
100
80

gap

60
0

0

50

100

150

80

160
120
X (mm)

200

Fig. 6. Motor observation by polarized pulsed neutron imaging.

Multistep Thickening of Nafion Thin Films in Water Studied by Optical and Neutron Reflectivity(Y. Ogata et al.)
1.5

Swelling ratio

Known for its remarkable conductivity and durability, Nafion is widely used as a proton exchange filmin polymer electrolyte fuel cells (PEFC). The excellent
electrochemical and mechanical properties of Nafion
are associated with the characteristic network structureof the hydrated water phase. One of the interestingdevelopments in the near future is downsizing PEFC.
The physical properties of a polymer film are generally altered with decreasing thickness for films andthe effects of air and substrate interfaces on thin films
are undoubtedly responsible for this thickness dependency, because the ratio of interfacial area to the total
volume of the film increases markedly with decreasing
film thickness. In this study, the thickness of thin Nafion
films in water was characterized as a function of timeby surface plasmon resonance (SPR) reflectivity in conjunction with neutron reflectivity (NR) measurements
performed at BL16 (SOFIA).
In the time dependence of the swelling ratio, whichis the ratio of the film thickness in water (hw) to that in
the dried state (h0), for Nafion films on silver and SiOx
substrates after coming in contact with water, the Nafion films thickened in three steps named here regimes
I, II and III (Fig. 7). The films asymptotically reached a

1.4

Nafion® films on
silver (SPR)
silver (NR)SiOx (SPR)
SiOx (NR)

Regimeḫ

1.3
1.2

RegimeḪ

1.1
1.0
0Regimeḩ

3

6

9

12

Time• 10–3 / s

15

18

Fig. 7. T ime dependence of swelling ratio for Nafion films
on silver (red) and SiOx (blue) substrates with an h0of 47 nm and 49 nm, respectively, prior to comingin contact with water.

swelling ratio of 1.05 (regime I), resumed thickening asymptotically up to 1.26 (regime II), and then the swelling
ratio reached 1.41 (regime III). While the characteristicswelling ratio at the border between different regimes
was neither dependent on the substrate species nor thefilm thickness, the swelling kinetics depended on the

J-PARC Annual Report 2013

Materials and Life Science Experimental Facility

29
It has been accepted that the swelling of bulk Nafion by water sorption is accompanied by a structuralchange. In short, the water first binds to sulfonic acidgroups of the side chain portion of Nafion. When thewater content in Nafion increases further, sphere-likeionic clusters are formed. The clusters finally connect toone another forming bridges. Interestingly, the swelling
ratio for the structural transition, was coincident withthe asymptotic swelling ratios in regimes I, II and III.
Thus, the three-step sorption behavior shown in Fig. 7
could be explained in terms of the structural evolution
in the internal region of the film. Figure 8 shows a model for the swelling of a thin Nafion film. It is noteworthy
that the hydrated layer is formed near the substrate.

type of the substrate.
To examine the aggregation structure of the Nafion
films near the substrate interface, the NR curves wereobtained for Nafion films with an h0 of 53 nm supported
on silver and quartz substrates in air and D2O at various
times. They were fitted with the calculated reflectivity
based on the model (b/V) profiles normal for the interface. A model (b/V) profile with a moderately single hydrated interfacial layer was suitable for the Nafion filmon the silver substrate. On the other hand, a model containing such an interfacial layer structure with a total
thickness of ca. 15 nm gave a better fitting for the filmon the quartz substrate. The result indicates that H2O
was sorbed in the interfacial region before soaking it
into D2O.

ionic clusterbound: waterionic channel

free: water:sulfonic acidgroup

RegimeϨRegimeϩdried

RegimeϪswollenTime
Fig. 8. A schematic representation of the structural evolution in a thin Nafion film contacting water.

Materials and Life Science Experimental Facility

J-PARC Annual Report 201330

Muon Science
Multiple-Probe Study of Highly Hydrogen Doped Fe-based Superconductor
LaFeAsO1-xHx (M. Hiraishi et al.)0.05 ≤ x ≤ 0.2, drawing broad attention regarding thedifference in superconducting mechanism between
SC1 and SC2. The relationship of SC2 with magnetism
would be of particular interest in comparison to thatof SC1. To investigate the origin of the two SC domes,
we have performed a multiple probe study in therange 0.40 ≤ x ≤ 0.51 using muon spin rotation/relaxation (μSR), powder neutron diffraction (ND), and X-ray
diffraction (XRD).

The recent development of the hydrogenation
technique in rare earth systems of Fe-based superconductors REFeAsO1-xHx (RE: rare earth) has succeeded insurpassing the limitation of the doping range available in fluorine doping. In the case of LaFeAsO1-xHx, theexistence of a secondary superconducting dome (SC2)around 0.2 ≤ x ≤ 0.4 has been revealed. Moreover, themaximum Tc of ~ 36 K in SC2 is higher than that of ~26 K in the first superconducting dome (SC1) around

0.4
0.2

LaFeAsO1-xHx x=0.45

0.0 2
0.01

4 6

2

4 6

0.1
1
Time (μs)

2

4 6

10

3

4

Normalized integrated intensity

0.6

1/2 1/2 0 T.M

Pµ (t)

0.8

10 K
120 K

D 0 2 T.N

300 K
80 K
60 K
50 K
25 K
1.6 K

1.0

1/2 1/2 2 T.M

1.2

(c)
1/2 1/2 1 T.M(b)Neutron intensity (arb. unit)

(a)

5

6

Lattice spacing, d (Å)(1/2, 1/2, 0) T.M

aT

bT

x = 0.51
Fe

TN

(µSR)
x = 0.45
0

50

100

Temperature (K)Fig. 9.	(a) μSR time spectra of LaFeAsO1-xHx for x = 0.45. Spectra below 80 K exhibit fast relaxation with precession signal.
(b) Neutron diffraction of x = 0.51 sample. At 10 K, there are additional Bragg peaks from magnetic order.
(c)	Temperature dependence of muon magnetic signal intensity (volume fraction x precession frequency squared)
and neutron Bragg peak intensity.

lml ~ 0.63 μΒ

150

lml ~ 1.21 μΒFeTemperature (K)Zero-field μSR time spectra for the x = 0.45 sample
measured at PSI shows an oscillation with increased
amplitude below 80 K, indicating the development of
the magnetically ordered phase (Fig. 9(a)). The temperature dependence of the magnetic volume fraction (MVF)
was measured using the DΩ1 spectrometer at MLF, andit was found that the onset of the magnetic transition
temperature TN and the MVF at the lowest temperature
decreases with decreasing the hydrogen content x.
Magnetic structure analyses on the x = 0.45 and x =0.51 samples were performed at BL08(SuperHRPD) andBL21(NOVA), and the magnetic Bragg beaks with q =(1/2, 1/2, n)T,M were observed in the low-temperature,
where the subscripts T, M and N refer to the tetragonalcell, magnetic and nuclear peak, respectively (Fig. 9(b)).
The temperature dependence of the Bragg peak intensity and the corresponding muon magnetic signal
intensity are shown in Fig. 9(c). Intensities of magnetic
peaks develop below TN = 89(1) K for x = 0.51 andTN = 76 K for x = 0.45, which is perfectly in line with theμSR result. XRD of x = 0.51 performed at BL-8 in KEK-PF
reveals that (2, 2, 0)T reflection exhibits peak splitting

TN
Ts
Ts
Tc

100
AF1

Fe

As

SC1

SC2

50

0
0.0

Fe

As

0.1

0.2
0.3
Hydrogen content x

AF2

0.4

0.5

Fig. 10. C rystal and magnetic phase diagram of LaFeAsO1-xHx.

Filled blue circles, green squares, triangles indicate antiferromagnetic transition temperature(TN) determined by μSR, structural transition temperature (Ts), and cT-axis upturn temperature (Ts’)
determined by XRD, respectively. Insets show themagnetic structures of AF1 (left) and AF2 (right)
determined by neutron diffraction, and the structures of FeAs4 tetrahedron.

J-PARC Annual Report 2013

Materials and Life Science Experimental Facility

31
on cooling, whereas, that reflection of x = 0.45 exhibits
simply slight broadening. In x = 0.51, (0, 0, L) reflection
does not exhibit peak broadening, indicating the occurrence of the tetragonal to orthorhombic (T-O) structuraltransition. T-O transition temperature Ts ~ 95 K is determined from the temperature dependence of the lattice
constant. Interestingly, cT axis length shows an upturn
below Ts • In x = 0.45, although an apparent T-O transition does not exist, the cT axis anomaly appears below
Ts’ ~ 80 K as in the case of x = 0.51, which may be attrib-

uted to the insufficient coherence of the splitting of aTand bT in the low-temperature phase.
These results are summarized in Fig. 10. The newly
discovered antiferromagnetic phase (AF2) precededby structural transition resembles the behavior of x =0 (AF1). The two-dome SC phase diagram may be interpreted as the carrier doping starting from the left andright side of the parent compounds, where the valley of
Tc around x = 0.2 may be a crossover region or the overdoping from both sides of the phase diagram.

Development on Non-Destructive Elemental Analysis for Extraterrestrial Materials using a Muon Beam (K. Terada et al.)100

μ Ca(3-2) 156keV
μ O(3-1) 157keV$OOHQGH0XUFKLVRQ

light elements such as B, N, C and O. Next we carriedout X-ray fluorescence spectroscopy for carbonaceouschondrites, Murchison and Allende. As shown in fig.
11, significant counts of fluorescent X-rays of Mg, C, Si,
Fe, Ca, and S from Murchison and those of Mg, Si, Fe, K,
and Ca from Allende were detected. On the other hand,those of K from Murchison and C and S from Allendewere not detected. This indicates that the detection
limit of muonic fluorescent X-ray at the current analytical condition is about 1 weight percent in concentration.
Finally, we tried the measurement on powdered
Murchison meteorite, weighting 610 mg, sealed in a
glass tube as a simulant of Hayabusa 2 samples. Clear
signals of Mg and marginally resolved signals of Fe weredetected through the 1-mm thick glass wall (Fig. 12).
Although O and Si are the major elements of rock samples, muonic X-rays of O and Si were emitted from the
SiO2 glass tube as well, which cannot be distinguishedfrom the sample signals. Although further developments in analytical techniques are required, our firstattempt for the non-destructive elemental analysis ofan extraterrestrial sample inside a glass tube succeededwith the detection of Mg and Fe.
μFe(3-2)242 keV

50μFe(3-2)265 keV
100

50

200

250

μC(2-1)75 keVCount (/0.25 keV)

μ Fe(3-2) 264keV
μ Fe(3-2) 269keV

100

300

350

80

200

μ Mg(2-1) 296keV

150

0

150

μMg(3-2)56 keV
μSi(3-2)76 keV

400

Fig. 11.	Muonic X-ray energy spectra from carbonaceouschondrites: Allende (red) and Murchison (blue) meteorites.

Count (/0.25 keV)50

μ Al(2-1) 347keV

0
200 0

Counts (/0.25keV)

μ O(2-1) 133keV

μ Al(3-2) 89keV
μ Fe(4-3) 92keV
μ Al(3-2) 100keV

μ Al(3-2) 66keV
μ C(2-1) 75keV
μ Si(3-2) 76keV

Counts (/0.25keV)

150

μ Mg(3-2) 56keV

μ Al(4-3) 23keV
μ O(3-2) 25keV

200

μ Al(5-3) 33keV

In 1971, Rosen proposed application of muon beamin the chemical analysis of tissues, as muon beam analysis would cause less damage to the host organism thanneutron activation analyses. Muonic atom spectroscopy has been developed over the past four decades
as a non-destructive analytical method. The stopping
distances of both negative muons (~ tens of MeV/c) andmuonic X-rays (more than several tens keV) are in theranges of millimeters, which could potentially enable
us to obtain the 3D elemental map from the near surface to the interior of rocky samples by changing the
momentum of the muon beam.
At first, we tried the depth profile analysis of the
four-layered sample which consists of SiO2, C (graphite) BN and SiO2 using the negative muon beam atthe D2 beamline. Then the result successfully demonstrated a potential of the muon beam analysis tomap non-destructively 3D elemental distributions of

60
40
20
0
50

60
70
Energy (keV)

80μMg(2-1)294 keV

20

Murchison
*0.2
Tube

10

0

240 260 280 300 320
Energy (keV)

Fig. 12.	Muonic X-ray spectra from the powdered Murchison
meteorite in a SiO2 glass tube.

Materials and Life Science Experimental Facility

J-PARC Annual Report 201332

Neutron Device
A Scintillator-Based Detector with Sub 100-μm Spatial Resolution for Time-ofFlight Neutron Imaging (T. Nakamura et al.)Time-of-flight neutron radiography and neutron
tomography are powerful non-destructive techniquesfor visualizing an object and quantifying the amountof elementals. However, the specifications required forneutron imaging place various challenges to the twodimensional detectors; in general these include small
pixels, a spatial resolution of less than 100 μm, a timing resolution of a few microseconds and a count ratecapability of more than 105 cps. We have developed a
new type of neutron-counting time-of-flight neutron
imager that extensively employed the scintillator andwavelength-shifting (WLS) fiber technologies. The
detector exhibits a high spatial resolution down to thesub-100-μm level with a low gamma-ray sensitivity ofless than 10–7 at ~1 MeV.
The neutron-detecting head (Fig. 13) comprises asingle scintillator screen, Fiber optic taper (FOT), crossed
WLS-fibre arrays. The ZnS/6LiF scintillator absorbs neutrons in a nuclear reaction of 6Li(n,α)T, and the ZnS scintillator emits scintillation light. The scintillation lightpropagates through the FOT while magnifying the lightimage onto the WLS-fiber arrays. The scintillation image
is magnified, in our case by a factor 3.1; in other words,
the effective pixel size of the detector becomes about
one-third of the fiber diameter. The WLS fiber reemits
a shifted green light that is transmitted to the PMTs.

neutrons
ZnS/ LiF
scintillator
6

W
av
el e

ng
th

Detector head

fib

er

(X

)

HT distributer

Fiber-optic
taper

-sh

i ft
ing

The incident position of a neutron is calculated by thesignal processing and encoder electronics according to
the excitation pattern of the PMTs. In order to achieve
the required spatial resolution the detector components were carefully selected or developed. Important
R&D points were: The thin scintillator screen that has athickness less than 100 μm, the FOT that can perform
image magnification with good light transmission, andthe crossed WLS-fiber arrays that were made with the
dedicated 100-μm diameter fibers.
Figure 14 shows a photograph of the prototype
detector. The scintillator thickness 100 ± 10 μm wasmade in house to match the range of the generated triton after the nuclear capture event. The pixel size of thedetector is 34 μm × 34 μm, and the exhibited spatial
FWHM resolution is 80 ± 7 μm and 61±6 μm in the x
and y directions, respectively. The neutron images of atest piece, which was constructed from polycrystalline
Cu and Fe, was measured at BL10, and clear signs of the
Cu/Fe interface were successfully detected in the reconstructed neutron images. It was demonstrated that the
prototype detector produced clear images with finemesh and high contrast by reconstructing the image
with the appropriate TOF window. It was also revealed
that the detector has a superior 60Co gamma-ray sensitivity of less than 10-7.

shi

gth
len
e
v
Wa

f

ber

fi
ting

(Y)

Fig. 13.	A schematic view of a neutron-detecting head of
the prototype detector.

PMTs
Scintillator/FOT

Amp./discri.
cards

Fig. 14. A photograph of the prototype scintillator-based
time-of-flight neutron imager.

Particle and Nuclear Physics

Particle and Nuclear Physics

J-PARC Annual Report 201334

Muon Neutrinos Turn to Electron Neutrino (T2K)
On July 19, 2013, the international T2K collaboration
announced that the transformation of muon neutrino
to electron neutrino has been definitely observed [1]. In
2011, the collaboration reported the first indication ofthis process, a new type of neutrino oscillation [2]. Now
with 3.5 times more data, this transformation has been
firmly established.
Neutrinos are subatomic particles with no electriccharge, and have the smallest mass of all known particles. Neutrinos come in three types (generations or
flavors): electron, muon, and tau. As they travel, neutrinos transform from one flavor to another. This phenomenon is called neutrino oscillation, caused by the fact thatneutrinos have mass and thus mix with each other.
The discovery of the neutrino oscillations was madeby the Super-Kamiokande collaboration in 1998 [3]: Theyobserved muon and electron neutrinos produced byprimary cosmic rays interacting with the Earth's atmosphere. The number of upward muon neutrinos, generated on the other side of the Earth, was half of the numberof downward ones, whereas the ratio for the electron
neutrinos remained the same. The neutrino oscillation
causes some of the muon neutrinos to change into tau
neutrinos, which process cannot be observed. It was thefirst experimental indication of very tiny, but non-zero,
mass differences between the neutrino generations.
Since then, for over a decade, many other experiments confirmed the phenomena of neutrino oscilla-tions through various disappearance modes of flavor
transformations. Meanwhile, the current observation
by T2K is the first of its kind in the sense that an explicit
appearance of a unique flavor of neutrino (electron neutrino) at a detection point is unequivocally observed
from a different flavor of neutrino (muon neutrino) at
its production point. The probability of such oscillation
processes includes the Charge-Parity (CP) violating termin its mathematical representation. The CP violation
provides a distinction in physical processes involving
matter and antimatter, and so far this phenomenon has
been observed only in quarks. According to a cosmological hypothesis named leptogenesis [4], the CP violation in neutrinos in the very early universe is the key
to understanding why today’s observable universe isdominated by matter.
T2K directs high-intensity neutrino beams produced at a neutrino experimental facility in J-PARC,
located in Tokai Village, Ibaraki Prefecture, on the east
coast of Japan. The neutrino beam is aimed at thegigantic underground detector, Super-Kamiokande,in Kamioka mine, near the west coast of Japan, 295 km(185 miles) away from Tokai (Fig.1). The neutrinos penetrate iron, concrete shields, and rocks effortlessly andreach Kamioka town within 0.001 second after they are
produced. Although most of them continue throughthe atmosphere into outer space, very small number oftraces is detected by the Super-Kamiokande.

Fig. 1. Overview of the T2K experiment. Out of the neutrino oscillation between three generations, the primaryobjective of T2K is to discover νμ-to-νe oscillation.

J-PARC Annual Report 2013

Particle and Nuclear Physics

35

Fig. 2. A muon neutrino event (left) and an electron neutrino event (right) observed by Super-Kamiokande. The charged
muon, produced by the muon neutrino interaction, goes straight into the water. Meanwhile, the electron, produced by
the electron neutrino interaction, causes electro-magnetic shower. As a result, the edge of the ring image is blurred.

The Super-Kamiokande detector is cylindrical inshape. It contains 50,000 tons of ultra-purified water,
and its inner surface is covered with approximately
11,000 highly sensitive photo-sensors, each of which
is 50 cm in diameter. The interaction between neutrinos and nuclei in the water results in the formation of
charged counterparts of the neutrinos, i.e., muons andelectrons. The muons and electrons emit weak conicalwave fronts along their trajectories and produce ring
images on the neighboring photo-sensors (Fig.2). The
neutrino flavors (muon-like or electron-like) and energies can be determined by analyzing these images. The
appearance of electron neutrino events denotes oscillation from muon neutrino to electron neutrino.
An analysis of the data from the Super-Kamiokande
detector associated with the neutrino beam time from
J-PARC reveals that there are many more electron neutrinos (a total of 28 events) than would be expected(4.9 events) without the electron neutrino appearance(Fig.3). The probability that random statistical fluctuations alone would produce the observed excess of electron neutrinos is less than one in a trillion, equivalently
the new results exclude such possibility at 7.3 σ level ofsignificance. Moreover, by a combination of this result
to the others observing disappearance of antielectron
neutrinos from nuclear reactors, the first-ever constraint has been obtained on a complex phase factor
δCP, the parameter representing the CP violation phenomena. Although its level of significance is still limited,
this observation has a strong impact on the forefront of
the quest for the CP violation in neutrino sector.
It is to be noted that this discovery was made possible through the tireless efforts to deliver high intensity beam to T2K, especially after the devastating March2011 earthquake in eastern Japan, which caused severe
damage to the accelerator complex and facilities at

Fig. 3. Energy distribution of the electron neutrino appearance
candidates. The data distribution (black dots with errorbars) agrees well with the expectation (red histogram),
which consists of background events (blue-hatched histogram) and electron neutrino appearance candidate
events.

J-PARC, and abruptly discontinued the data-taking of
the T2K experiment.
Now, after T2K firmly established the electron neutrino appearance, a search for the CP violation in neutrinos
becomes one of the major scientific quests in the coming
years, where T2K will continue to play a leading role. The
T2K experiment expects to collect 10 times more data in
the near future, including data with antineutrino beam
for studies of the CP violation in neutrinos.

References[1] T2K collaboration, Phys. Rev. Lett. 112, 061802 (2014).
[2] T2K collaboration, Phys. Rev. Lett. 107, 041801 (2011).
[3] Super-Kamiokande Collaboration, Phys. Rev. Lett. 81,
1562 (1998).
[4] M.Fukugita and T.Yanagida, Phys. Lett. B 174, 45(1986).
(reprint from the KEK Annual Report (research highlights))

Particle and Nuclear Physics

J-PARC Annual Report 201336

Hadron and Nuclear Physics
The results of the E10 experiment to search for aneutron-rich Λ hypernucleus, 6ΛH, have been published[1]. Neutron-rich Λ hypernuclei are of interest because
they provide valuable information about the strengthof the ΛN interaction and its modification by themulti-body effect in a neutron-rich environment. This
information is necessary to understand the propertiesof nuclear matter such as the equation of state (EOS),
especially in the high-density regions like neutron stars.
In the 6ΛH hypernucleus, unbound 5H is bound becauseof the glue-like role of the Λ hyperon. Moreover, thecoherent ΣN-ΛN mixing, which has a significant effectin neutron-rich nuclei present in neutron stars, may
provide additional binding [2]. Therefore, the existenceof 6ΛH and its ground-state energy need to be experimentally investigated.
Recently, the FINUDA group at DAΦNE reported on
three candidate events of 6ΛH using simultaneous π+ andπ− measurements of the production channel K−stop + 6Li→ 6ΛH + π+ and the weak decay 6ΛH → 6He + π− [3]. The
reported Λ binding energy of 4.0±1.1 MeV, with respect
to 5H+Λ threshold, was close to the value predictedwithout the coherent ΣN-ΛN mixing effect. Since thisobservation is still debated and the observed number of
events is small, the confirmation of 6ΛH and measurement of the binding energy with different reactions
using higher statistics are very important.
In the E10 experiment that was carried out in
December, 2012 and January, 2013, the production of
6 H was searched for via the 6Li(π−,K+)X reaction at pπΛ
= 1.2 GeV/c using Beam and SKS spectrometers at theK1.8 beam line. The cross section of the double chargeexchange (π−,K+) reaction is very small in comparison
with the non charge-exchange (p+,K+) reaction andwas expected to be of the order of 10 nb/sr from theprevious measurement of the 10B(π−,K+)10ΛLi reaction [4].
Therefore, high-intensity beams of (12–14)×106 π−/spill,where the beam spill length was 2.0 seconds in every
6.0 seconds, were used. In total, 1.4×1012 π− were irradiated on the enriched 6Li (99.54%) target with a densityof 3.5 g/cm2. The mass scale was calibrated using thep(π−,K+)Σ+ reactions with an accuracy of ±1.26 MeV/c2.
The missing-mass resolution was found to be 3.2 MeV/c2(FWHM), as estimated from the 12Cπ+,K+)12ΛC spectrum.
Figure 4 shows the missing-mass spectrum. No
significant peak structure was observed around theFig. 4. Missing-mass spectrum of the 6Li(p−,K+) reaction at 1.2 GeV/c. The vertical axis
shows the double differential cross section averaged over the scattering angle
from 2 to 14 degrees. A magnified view around the L bound region is shown in
the inset.

J-PARC Annual Report 2013

Particle and Nuclear Physics

37
2500

Binding Energy [GeV]

0.3

0.2

count / 5MeV/c 2

M(Λ+p）

M( Σ+π+p）

1000

2.0

0.0

ry
a
n
i
prelim

1500

500

0.1

M(Λ
（1405）+p）

2000

2.1

2.2

2.3

0

KS tag x 10

accidental background

3

2.4
-

2.5

2

Missing Mass He(K ,n) [GeV/c ]

2.6

2.7

Fig. 5. Semi-inclusive spectrum of the 3He(K-,n) reaction at 1.0 GeV/c (black). Verticallines indicate the various decay thresholds. The red histogram shows that K0s is
detected with the CDS [5].

H+2n particle decay threshold of 5801.7 MeV/c2. The
number of events observed around the threshold isconsistent with the background due to misidentification of π+ particles and protons with K+ particles. The
upper limit of the differential cross section averaged
over the scattering angle from 2 to 14 degrees was estimated to be 1.2 nb/sr at 90% confidence level. These
results do not favor a simple interpretation of the
FINUDA observation and suggest reconsideration of
the structure of 6ΛH.
Kaon bound nuclei are the other objects of interestin the context of the high-density region of the EOS.
Two experiments at J-PARC aim to discover the simplest
kaon bound nuclear system, K-pp. In 2013, E15 at theK1.8BR beam line started collecting data following E27
at the K1.8 beam line in 2012. In E15 K−pp is searched
for in both production and decay channels. The K−pp
is produced via the 3He(K−,n) reaction at 1.0 GeV/c asmeasured by beam spectrometer and neutron detector,
and its decay, K−pp → Λp → π−pp, is detected by the
Cylindrical Detector System (CDS) surrounding theliquid 3He target. Nearly 1% data was obtained before
the incident at the Hadron facility in May. A semi-inclusive spectrum of the production is shown in Fig. 5. There
were some yields below the K−+p+p threshold that
could not be explained by the experimental resolution
or the known processes. This might be a contribution4

Λof the K−pp bound system. Further data acquisition isplanned.
A new primary beam line is under construction at
the Hadron facility. This beam line will deliver a fraction of the main proton beam of 30 GeV for hadron
physics experiments and a high-intensity 8 GeV proton
beam for the muon-to-electron conversion experiment,
COMET. The design of the beam line was reviewed
by an international committee in January, 2014. The
committee did not find any areas of serious concern.
Detector developments for the first experiment, E16,
are also underway. The technical design report of theE16 experiment will be submitted to the J-PARC PAC in
April, 2014.
References[1] H. Sugimura et al., J-PARC E10 Collaboration, Phys.
Lett. B 729, 39 (2014).
[2] Y. Akaishi, T. Yamazaki, Frascati Phys. Ser. XVI, 59(1999).
[3] M. Agnello et al., FINUDA Collaboration, Phys. Rev.
Lett. 108, 042501 (2012).
[4] P. K. Saha et al., KEK E521 Collaboration, Phys. Rev.
Lett. 94, 052502 (2005).
[5] T. Hashimoto et al., EPJ Web of Conference 66,
090008 (2014).

Particle and Nuclear Physics

J-PARC Annual Report 2013

38

Kaon Experiment
The quantum-mechanical transition of a heavy
particle into lighter particles is called “decay” in particle
physics. The decay of a specific particle proceeds via
several paths or “decay modes.” The branching fraction
for a decay mode is, once experimentally determined,
compared to theoretical predictions; any discrepancy
between the experimental results and theoretical predictions can be regarded as a new evidence for physics
beyond the Standard Model (SM).
The decay of a long-lived neutral K meson (KL) into aneutral π meson (π0) and a pair of neutrinos, KL→π0νν,
is known to be a rare and precious process in particle
physics. The SM predicts this decay occurs once in forty billion decays. New sources of symmetry breaking,which can explain the matter–antimatter asymmetry in
the universe, may be revealed by examining this decay.
On the other hand, for experimentalists, detecting thisdecay is a challenge because only two photons from π0
are observable in the detector.
The J-PARC E14 KOTO experiment, proposed in
2006, is to study the KL→π0νν decay. In the south sideof Hall of the Hadron Experimental Facility (HEF) of JPARC, a new neutral beamline for KOTO was built in2009. A total of 2716 undoped CsI crystals were stacked
for the KOTO calorimeter in 2010. The crystals andphototubes are those that have been used in the KTeV
experiment at Fermilab, USA, in 1990’s. The beamline
components were realigned after the big earthquake
in March, 2011, and the construction of the detector
resumed. To detect extra particles from KL decays, efficient charged-particle and photon veto counters werebuilt and installed to the inside of the vacuum vessel ofthe KOTO detector. They surround the decay region hermetically. In 2013, more veto counters were placed tothe downstream of the vessel (Fig. 6) in order to detect
the charged particles and photons escaping along thebeamline. After the commissioning of the trigger anddata acquisition system, the first physics run started inMay. The first KOTO data for one hundred hours, corresponding to 1.6 × 1018 protons on target, were recorded
before the incident at the HEF.
The analysis of the data is in progress and will be reported in 2014. Figure 7 shows the distributions of theinvariant mass and the momentum of KL reconstructedfrom the selected events of KL→π0π0π0 decay (one infive KL decays) and the KL→π0π0 decay (one in a thousand). The distributions are reproduced by a Monte
Carlo simulation, which demonstrates that the detector
performance is well understood in the analysis.

Fig. 6. Extra-particle veto counters
located at the downstream ofthe vacuum vessel of the KOTO
detector.
Fig. 7. Distributions of the invariant mass (left) and the momentum (right) of KL
reconstructed from the KL→π0π0π0 (top) and KL→π0π0 (bottom) decay
events. Dots with error bars indicate the recorded data, and hatchedhistograms are the results of Monte Carlo (MC) simulation studies.

J-PARC Annual Report 2013

Particle and Nuclear Physics

39

COMET
Coherent Muon to Electron Transition (COMET)
is an experiment that aims to search for the muonto-electron (μ-e) conversion in muonic atoms, which
violates the lepton-flavor conservation, using an
intense pulsed-muon beam generated at J-PARC. The
μ-e conversion mode is thought to be sensitive to more
physics cases compared to the μ→eγ decay search [1].
Thus, success in the search has been expected since
the previous experiment was completed [2]. In 2013,
the COMET experiment started constructing facility
components to achieve experimental conditions in atimely manner; fabrication of a superconducting wirewith an aluminum stabilizer, which is indispensable for
producing a strong magnetic field for generating a highintensity muon beam in a high-radiation environment,
has successfully started, and winding of magnet coils
has also been initiated (Fig. 8). Construction of a newbuilding containing a new beam line in the basement
and control rooms for experimental facility operation
upstairs began in early 2013. R&D of the detector has
made significant progress; prototype detectors for electron momentum and energy measurements have been
constructed in collaboration with Japanese and foreign
institutes. Performance evaluation tests using prototype detectors were conducted with favorable results.
This work will continue in 2014 toward construction of
the innovative detector system, which is essential for
the COMET experiment.

Fig. 8. Coil winding for the COMET experiment.

References[1] Charged Lepton Flavor-Violation Experiments, S.
Mihara, J.P. Miller, P. Paradisi, and G. Piredda, Annu.
Rev. Nucl. Part. Sci. 63, 531-552, 2013.
[2] A Search for μ-e conversion in muonic gold, Bertl,
W. and others (SINDRUM II Collaboration), Eur. Phys.
J. C47, 337-346, 2006.

Particle and Nuclear Physics

J-PARC Annual Report 201340

g-2 / EDM
This experiment measures the muon anomalous
magnetic moment (g-2) with 0.1-ppm precision and theelectric dipole moment down to a sensitivity of 10-21
e·cm. R&D is in progress to realize a novel experimental
technique to achieve an ultra-slow muon source, muon
acceleration, injection, storage magnet, and tracking
detector. One of the major achievements in FY2013 isthe development of a muonium production target using silica aerogel [1]. A substructure was introduced on
the surface of a silica aerogel to improve the efficiencyof muonium emission to vacuum (Fig. 9). Systematicstudies with these samples have started at TRIUMF and
J-PARC [2]. There were also achievements in the following areas. Simulation studies on muon acceleration
by an RFQ confirmed that muons are accelerated withhigh efficiency. Design of a transport beamline fromthe muon accelerator to the storage magnet was developed. The detailed design of the muon storage magnet
was advanced, taking into account the assembly procedure. Improvements were made to a magnetic-fieldmeasurement system using NMR to realize a resolution
better than 0.1 ppm. Silicon strip sensors for a positron
tracking detector were designed on the basis of simulation studies to optimize the performance. A prototypeof the frontend ASIC was developed. Evaluation of thetest sensors and the prototype ASIC confirmed thatthey meet the requirements for this experiment.

Fig. 9. Laser processed aerogel used in the muonium test.

References[1] Measurement of muonium emission from silica
aerogel, P. Bakule and others, Prog. Theor. Exp.
Phys., 103C01, 2013.
[2] Enhancement of muonium emission rate from silica
aerogel with a laser-abiated surface. G. A. Beer andothers, Prog. Theor. Exp. Phys., 091C01, 2014.

Cryogenics Section

Cryogenics Section

J-PARC Annual Report 2013

42

Overview
The Cryogenics Section supports scientific activities
in applied superconductivity and cryogenic engineering,
carried out at J-PARC. It also supplies cryogen of
liquid helium and liquid nitrogen. The support work
includes the operation of the superconducting magnet
system for the neutrino beamline, and support forthe construction and operation of a superconducting
solenoid magnet system for the muon beamline at theMaterials and Life Science Experimental Facility (MLF)
and the Hadron Hall. It also actively conducts R&D
works for future projects in J-PARC.

Superconducting Magnet System
For the T2K Beamline
The Cryogenics Section operates the superconducting
magnet system for the T2K neutrino beam line. The
operation history in FY 2013 is summarized in Table 1. Dueto a long shutdown period for a J-PARC machine upgrade,the number of operation hours in FY2013 was decreased.

During the long shutdown period, the electric joints at allquench protection diodes in each magnet cryostat wererefurbished, and an activated charcoal for a compressor
oil adsorption was replaced.

Table 1. Operation history of the superconducting magnet system for the J-PARC neutrino beamline.
2013
April
Operation

2014
May

June

4/1−5/10 5/24−27

July

Aug.

Sept.

Oct.

Nov

Dec.

Jan.

Feb.

Mar.

7/15−20*

Annual MaintenanceCold Diode Consolidation
Commissioning
Note*1: Warm up

For the Muon U-line at MLF
The Cryogenics Section supports the constructionof the intense ultra-slow muon beam line (U-line)in the Muon Science MLF. After commissioning in
FY2012, the superconducting curved solenoid andthe superconducting focusing solenoids started theiroperations and successfully extracted muon beam
into the experimental equipment. Unfortunately, aradiation shield foil at the upper end of the curved
solenoid disappeared during the long shutdown period
due to an unknown accident, so the upper end of thecurved solenoid is not being cooled down enoughfor charging-up. In the summer of FY2014, it has beenplanned to repair the radiation shield.

J-PARC Annual Report 2013

Cryogenics Section

43

For the Muon D-line at MLF
One of the major contributions of the cryogenics
section has been the recovery of the superconducting
magnet system of the MLF muon D-Line after the Great
East-Japan Earthquake. The magnet and the refrigeration system were damaged due to the earthquake, andthe SC magnet and the helium compressor had to be
replaced. The section contributed to the fabrication of
the magnet (Fig.1) and the reconstruction of the refrigeration system with the replaced He compressor. The
commissioning of a refrigeration system with a new
helium compressor is planned for September, 2014. The
SC magnet will be fabricated by the end of FY2014, andwill be installed during the shutdown in the summer of2015.
Fig. 1. SC Coil for the MLF muon D-Line magnet system.

Superconducting Kaon Spectrometer (SKS)The Cryogenics Section supports the Superconducting Kaon Spectrometer (SKS) operation at the
J-PARC Hadron Hall. Since the incident at the Hadron
Hall, the operation of the SKS has been stopped. Whilethe incident response and reconstruction of the HadronHall are advancing, maintenance for the SKS has been
performed with the goal to resume the operation fromthe autumn of 2014.

For COMETThe construction of the COMET Phase-I experimentstarted in FY2013. The Cryogenics Section has been involved in the COMET experiment to develop the superconducting magnet system. The Pion Capture Solenoid
magnet employs aluminum stabilized superconducting
cable to reduce nuclear heating by severe radiation. The
winding machine was newly developed for the cablewith a cross section of 4.7 mm × 15 mm. One of the coilsin the Pion Capture Solenoid, which consists of the SC
cable and radiation hard insulation and resin, has beenwound in FY2013 as shown in Fig.2.
Fig. 2. Picture of a coil of the COMET Pion Capture Solenoid
wound in FY2013.

Cryogenics Section

J-PARC Annual Report 201344

For TREKThe TREK/E36 experiment for the measurementof lepton flavor universality violation is planned at theK1.1-BR experimental area in the J-PARC Hadron Hall.
The superconducting toroidal magnet with a helium
refrigerator that was used in the KEK E246 experiment
performed in 1990 will be re-employed for this experiment. The Cryogenics Section conducts repair works

on the magnet and the refrigeration system. Figure 3
shows the overview of the toroidal superconducting
magnet and the internal assembly with cooling channels and superconducting bus bars at the magnet
interface. Furthermore, a new control system for the
cryo-plant was developed in collaboration with Taiyo
Nippon Sanso Gas Co., Ltd.

Fig. 3. Overview of the toroidal superconducting magnet (left) and the internal assembly (right).

Cryogen Supply and Technical Support
The Cryogenics Section provides liquid helium
cryogen for physics experiments in J-PARC. The liquid
helium is supplied to the users in collaboration with the
Accelerator Division using the helium liquefier ownedby the Accelerator Division. The used helium is recovered by the helium gas recovery facility, which is provided and operated by the Cryogenics Section. Figure
4 summarizes the liquid helium supply in FY 2013. The
supply was stopped after the incident at the HD facility.
The user operation was restarted at MLF in February,

2014, therefore, the helium supply also resumed at thesame time.
Liquid nitrogen was also supplied to the users fortheir convenience and its amount during the period in
FY2013 is summarized in Figure 5. After the incident
at HD facility, the main user of liquid nitrogen was the
Radiation Safety Section for operating a gas chromatograph. After the restart of the user operation at MLF, thenitrogen supply is also gradually increasing.

Cryogenics Section

J-PARC Annual Report 201345

Liquid Helium Supply at J-PARC
Neutron(MLF)

3000

HadronCumulative2500

Supply (L)Muon(MLF)

2500

2000

2000

1500

1500

1000

1000

500

500

0

Cumulative Supply (L)

3000

0
May

Jun

Jul

Aug

Sep

Oct

Nov

Dec '14.Jan Feb

MarFig. 4. Liquid helium supply at J-PARC from May, 2013, to March, 2014.

Liquid Nitrogen Supply at J-PARC
2500

Radi.Cen.

Neutron(MLF)

Muon(MLF)

HadronCryo.Sec.

Cumulative

8000
7000
6000
5000

1500

4000
1000

3000
2000

500

1000
0

0
May

Jun

Jul

Aug

Sep

Oct

Nov

Dec '14.Jan Feb

MarFig. 5. Liquid nitrogen supply at J-PARC from May, 2013, to March, 2014.

Cumulative Supply (L)Supply (L)2000

Cryogenics Section

J-PARC Annual Report 201346

R&D for the Future J-PARC Project: New Muon g-2/EDM
and Muonium HFS
The g-2/EDM project using H-line of MUSE, which is
the muon beam line in MLF, was proposed by a group of
IPNS in 2009. The experiment aims for the precise measurement of the anomalous magnetic moment and theelectric dipole moment of muons. In this experiment, asuperconducting solenoid with high field homogeneity
better than 1 ppm locally is a key component to store
muons during the measurement of their precession
frequency. Design study of the magnet is in progressin collaboration with IPNS and the Cryogenics Science

Center. In parallel with the magnet design, the designof the experimental hall has also started.
A muonium hyperfine structure (MuHFS) measurement using the same beam line as the g-2/EDM project has been also proposed by a group of IMSS. In thisexperiment, the energy state transition in muonium
will be observed under a static magnetic field with local
homogeneity of 1 ppm. A superconducting magnet
for a MRI system has been installed at the MLF for theexperiment.

J-PARC Annual Report 2013

Cryogenics Section

47

Information System

Information System

J-PARC Annual Report 2013

48

Statistics of Network Utilization
Since 2002 the J-PARC network infrastructure,
called JLAN, has been operated independently fromKEK LAN and JAEA LAN in terms of logical structure
and operational policy. In 2013, the total number ofhosts on JLAN exceeded 3900 and the number has
increased by 108% from the last year. The growth curveof edge switches, wireless LAN access points and hosts(servers and PCs) connected to JLAN are shown in Fig. 1.
Figure 2 and 3 show the network utilization of theinternet from/to JLAN. The bandwidth capacity forthe internet through the Japan Science Information
Network (SINET) is 10 Gbit/sec, which allows enoughextra activity. JLAN has not only been used for internal
communication in the J-PARC and external networking
through the internet but it also played an importantrole in the transfer of experiment data from the Tokaiarea, where the main J-PARC facilities were built, to the
Tsukuba area, where the major computer resources fordata analysis are located. Figure 4, 5 shows the statistics
of data transfer between the two sites. The bandwidth
capacity for the connection is currently 1 Gbit/s x 8 =8 Gbit/s and the usage level has been approaching ahalf of it in 2 hours average and two-thirds in 5 minutes
peak transfer rate, especially during the period when
the Hadron facility was running. The figure also showsthat after June the major network traffic output from
J-PARC was suspended due to the J-PARC temporary
shut-down following the incident at the Hadron Experimental Facility on May 23.
Independently of the JLAN, Guest wireless network service (GWLAN) for the internet connection is
maintained to serve short-term visitors and is available in almost all J-PARC buildings, IBARAKI Quantum Beam Research Center and the Tokai Dormitory.
Figure 6 shows the daily connections of visitors’ hosts
to the GWLAN.

4500
4000

WLAN Access Points

3500

No. of hosts

3000

150
2500
2000
100
1500
1000

50

500
0

13
20

12
20

11
20

10
20

09
20

08
20

07
20

06
20

05
20

04
20

03
20

20

02

0

FY

SW and WLAN AP

200

Edge Switches

Fig. 1. Number of hosts, edge SW and wireless AP on JLAN.

Number of Hosts , edge SW and wireless AP on JLAN

No. of Hosts connected to JLAN

250

J-PARC Annual Report 2013

Information System49

out peak (5m)GBits/sec

0.4

out (2h avg.)

0.2
0

Apr-13May-13

Jul-13Aug-13Oct-13

Dec-13Jan-14Mar-14

Fig. 2. Network traffic statistics from JLAN to the internet.

in peak (5m)
in (2h avg.)

GBits/sec

0.4
0.2
0

Apr-13May-13

Jul-13Aug-13Oct-13

Dec-13Jan-14Mar-14

Fig. 3. Network traffic statistics from the internet to JLAN.

7
6

in peak (5min)GBits/sec5

in (2h avg.)

4
3
2
1
0
Apr-13May-13

Jul-13Aug-13Oct-13

Dec-13Fig. 4. Network traffic statistics from Tokai site to Tsukuba site.

Jan-14Mar-14

Information System

J-PARC Annual Report 2013

50

1.0

GBits/sec

0.9
0.8

out peak (5min)

0.7

out (2h avg.)

0.6
0.5
0.4
0.3
0.2
0.1
0.0
Apr-13May-13

Jul-13Aug-13Oct-13

Dec-13Jan-14Mar-14

Fig. 5. Network traffic statistics from Tsukuba site to Tokai site.

300

No. of Hosts

250
200
150
100
50
0
4

5

6

7

8

9

10

11

12

Month

Fig. 6. Guest WLAN network service use statistics.

1

2

3

J-PARC Annual Report 2013

Information System

51

Statistics of Computer Resources Utilization
Though J-PARC does not have its own computing
facility for physics analysis, since 2009 the KEK centralcomputer system at the KEK Tsukuba site has been
mainly used for the that purpose. In April 2012, theKEK central computer system was upgraded. Currently
computer resources of 25,000 SPECint06 computing
power, 1.2 PBytes disks and 5 PBytes tapes wereassigned to J-PARC (Table 1).
In the Neutrino (T2K experiment) and Hadronexperiments, the data taken in the J-PARC experimental
hall will be temporarily saved at the Tokai site andthen promptly transferred to, stored and analyzed at
the system in Tsukuba. The storage of the system will
also be utilized as a permanent data archive for the
Neutrino, Hadron and MLF experiments. Figures 7, 8
and 9 show the utilization statistics of the computerresources in 2013. The main users who used the CPU
and the storage constantly were a Hadron experimentgroup (Koto), and who continue their experiment inseries from the KEK 12 GeV Proton synchrotron closed
in 2005 to J-PARC. The MLF group also started to store
data to tapes on the system.

Table 1. Assigned computing resources to J-PARC activities in the KEK central computing facility.

100

Other KEK use

Assigned resources
to J-PARC

New systemCPU25,000 SPECint06

RAID Disk

1,200 TB

Tape

5.0 PB

J-PARC Hadron

J-PARC MLF

J-PARC neutrino

80

%

60
40
20
0

Apr-13 May-13 Jun-13 Jul-13 Aug-13 Sep-13 Oct-13 Nov-13 Dec-13 Jan-14 Feb-14 Mar-14

Fig. 7. CPU usage statistics.

Information System

J-PARC Annual Report 2013

52

J-PARC Hadron

800

J-PARC Neutrino

J-PARC MLF

700

TBytes

600
500
400
300
200
100
4
-1
ar
M

14
bFe

14
Ja

n-

13
cDe

13
No

v-

3
-1
ct
O

13
pSe

13
g-

3

Au

M

Ju

Ju

n-

l-1

13

3
-1
ay

3
r-1
Ap

M

ar

-1

3

0

Fig. 8. Disk usage statistics.

J-PARC Hadron

1.20

J-PARC Neutrino

J-PARC MLF

0.80
0.60
0.40
0.20

Fig. 9. Tape library usage statistics.

4
-1
ar
M

14
bFe

14
nJa

3
-1
ec
D

3
N

ov

-1

3
-1
ct
O

13
pSe

13
gAu

3
l-1
Ju

13
nJu

M

ay

-1

3

3
r-1
Ap

ar

-1

3

0.00

M

PBytes1.00

Transmutation Studies

Transmutation Studies

J-PARC Annual Report 2013

54

Activities
National Review Working Party for Partitioning and Transmutation Technologies
In September, 2011, the Science Council of Japansummarized the recommendations for dispositionof high-level radioactive waste to the Atomic Energy
Commission of Japan. It recommended that the study
for reducing radioactive waste such as partitioning andtransmutation technology should be promoted. The
public interest into spent fuel or radioactive waste also
increased after the accident in the Fukushima-Daiichi
nuclear power plant. To continue the nuclear power
generation, the options to reduce the long-lived radioactive waste become one of the important issues fornuclear energy.
In 2013, national review working party for partitioning and transmutation (P&T) technologies using
Accelerator-driven System (ADS) were launched by
the Ministry of Education, Culture, Sports, Science andTechnology in Japan (MEXT). The working party aims at
reviewing the state-of-the-art P&T, feasibility for construction of J-PARC Transmutation Experimental Facility(TEF), and cost and benefit of cooperation with European MYRRHA project. Five meetings were held from
August to October, 2013, and an interim report wasissued in November, 2013, on the website of MEXT.
In the interim report, the working party specified a roadmap to realize ADS based P&T fuel cycle.
The working party also recommended to promote
P&T technology as an important alternative option for
future nuclear waste management and agreed that it
would be necessary to build facilities capable of han-dling certain amount of Minor Actinides (MAs) and theplan to establish such facilities should be continued. As
for the construction of J-PARC TEF, a step up from thecurrent basic study stage to the next stage is noted
as “suitable”. It is also noted that a detailed technicalreview should be held before initiating construction.
As for the participation in the MYRRHA project, it isproper to begin negotiations with Belgium in comprehensive cooperation not only with JAEA but also with
universities and the commercial sector. The committee
continues a review works of the P&T technology including the status of the TEF project and negotiation of the
MYRRHA project.
Reflecting the recommendations, supplemental budget was allocated to the experimental studies
for lead-bismuth eutectic (LBE) handling for ADS Target Test Facility (TEF-T) and remote operation of MA
bearing fuel to be used in Transmutation Physics
Experimental Facility (TEF-P). For the study for LBE handling, engineering examinations for loop equipment
including electromagnetic pump will be performed.
Mockup of spallation target for material irradiation will
also be prepared. As for the remote operation tests for
MA bearing fuel, confirmation of remote operation,
which is designed to minimize the effect of experimental accuracy and to maximize the reproducibilityof experiments simultaneously, will be performed. The
experimental equipment will be completed in fiscal
year 2014.

Studies to Construct Transmutation Experimental Facility
After the Fukushima Accident, the safety regulations for nuclear reactors, including critical assembly,
became much stricter. The construction plan for TEF
has been changed to start construction from TEF-T
first, which was categorized as a radiation application
facility, and design works and licensing procedure
to build TEF-P, that was classified in the experimental
nuclear reactor category will be performed simultaneously. Developments for the TEF-T equipment such as
preliminary tests for off-beam target loop experiments
and preparation for validation of target instruments areunderway.

A prolonged operation of JAEA Lead-Bismuth Loop
#2 (JLBL-2), which simulates sealed-annular tube typespallation target, has finished running 4,500 hours at
the temperature of 300˚C. During the operation, theElectro-magnetic flow meter gives unstable values andwe decided to perform simultaneous measurementof the LBE flow rate by the current Electro-magnetic
method and the newly added Ultrasonic method withthe experts of Fast Breeder Reactor development. The
sensors and the measurement equipment are underpreparation.
For the design study of TEF-T, design of the LBE spal-

J-PARC Annual Report 2013

Transmutation Studies

55
lation target components is in progress. Reflecting theexperiences at the Material and Life Science Facility in
J-PARC, trolley-mounted type primary circuit system for
the LBE target was selected. There are two options forsecondary coolant, helium gas and pressurized waterand selection of secondary coolant material will bedone based on the on-going cooling circuit configura-tion design. For the design study of the spallation target
for TEF-T, reference operation condition was specified,
and the soundness of the LBE target was evaluated. By
the reference operation condition which is referring to
the future ADS transmutor, the target casing made by
T91 steel has enough strength for 4,500 hours operation of a 400 MeV proton injection.

MEGAPIE
The world’s first megawatt-class lead-bismuth
target, MEGAPIE (MEGAwatt Pilot Experiment), was dismantled and post irradiation examination (PIE) samples
were prepared at the Paul Sherrer Institute (PSI) hot-lab.
The samples were shipped to each institutions including JAEA. The JAEA samples were transported to JAEA’s
hot-lab WASTEF in May 2013 successfully. The samples
were cut from the beam window (BW, T91) and the flow
guide tube (FGT, SS316L). The total number of JAEA
samples was 67 and all of them were prepared without
LBE.
Before the PIE, some equipment in the WASTEF,
manipulator arms, ventilation equipment and in-cellradiation monitors were replaced. As preparation for
the PIE, tensile test jigs were newly designed and man-ufactured. TEM was repaired and some samples wereprepared for microstructure observation.
After these works were finished, the PIE started in
the beginning of March. Until the end of March, the tensile tests on 8 MEGAPIE samples were performed at RT.
Microstructure observation by TEM was performed for
2 MEGAPIE samples.
Several meetings on MEGAPIE were held at PSI
Switzerland in February, 2014. In the meetings, the PIE
plan of each institutes including JAEA were presented
and considered. Scheduling and test conditions werealso discussed. It was decided to report the PIE results at
TRM (Technical Review Meeting) to be held in October,
2014.

Fig. 2 The tensile specimen tested at RT (T91, 1.44 dpa).

Fig. 1 MEGAPIE samples cut from the BW.

Transmutation Studies

J-PARC Annual Report 201356

BOP Analysis for LBE Target Beam Window

2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0

corrosion and structural strength of materials, the temperature criteria were set to 500˚C. The pulse repetition
frequency of the proton beam was 50 Hz.
The analysis result is shown in Fig. 4. The horizontal axis represents time, and vertical axis represents
the maximum temperature observed at the centerof a beam window. When a beam window continued
maintaining a soundness in steady state, the maximum
temperature in case-1 reached 610˚C, and reached
963˚C in case-2.
In case-1, the arrival time to temperature criteria(500˚C) was about 300 msec, and it was equivalent tothe beam incidence time for 16 pulses. In case-2, it was
60 msec and was equivalent to 4 pulses. These times
were enough for a conventional beam stop sequence,and the countermeasure of BOP was to prove that thesequence will function normally.

BOP case-1

1000

BOP case-2

900

0 1 2 3 4 5 6 7
radial position [cm]Fig. 3. Peak current density profile for BOP analysis.

Max. temperature [ ഒ]heat power density[W/cm3]

To deal with the similar phenomenon of the incidentof Hadron Experimental Facility in J-PARC, an evaluationof the soundness of a present design beam window
for TEF-T aiming at future realization was performed.
Specifically, the transient thermal-fluid analysis was
performed to estimate the temperature behaviorof the beam window when an unexpected extreme
beam was supplied to TEF-T. In TEF-T, the acceptance of the proton beam of peak current density of
20 µA/cm2 with a Gaussian shape has been considered.
Figure 3 shows the beam conditions in this analysis. The
analysis was performed about two beam over power(BOP) conditions; (BOP case-1) a double peak current
density for the normal condition, and (BOP case-2) aconverged beam condition (two times as large as a 60
µA/cm2 condition). The Inlet temperature of the coolant (Lead-Bismuth Eutectic alloy, LBE) was 350˚C, andits flow rate was 1 liter/sec. By the viewpoint of erosion/transient [20]steady [20]transient [60]steady [60]

800
700
600
500
400
-0.1

0

0.1

0.2

0.3

time [sec]

0.4

0.5

Fig. 4. Transient analysis result in BOP condition.

0.6

SafetySafety

J-PARC Annual Report 2013

58

Radiation Safety
1. Contribution to the recovery from the Hadron incident
As described in the special section on “Hadron (HD)Incident”, we had experienced an incident of radioactivity leak to the outside of the site boundary of J-PARC at
the HD Experimental Facility. The radiation safety section, therefore, was heavily involved in the monitoring,decontamination, radiation safety management, andimprovement of the radiation monitors in particular
for the Hadron and Neutrino Facility, whose deficiency
was one of the causes for the incident. In addition, thesafety management system was reorganized to facili-tate reliable safety management specifically in the caseof emergency. As a part of the reorganization, the former Radiation Safety Meeting (RSM) was reformed to
Radiation Safety Review Committee (RSRC) by inviting
external experts and appointing a person-in-charge foreach facility to reinforce the review capability of risks
and measures. In parallel with those jobs relevant to
the incident, regular tasks for radiation safety in J-PARC
were conducted in the section.

2. Meeting and committee on radiation matter
Before the RSRC was created, the RSM was frequently held in the short period from August 30 to
October 311 in order to discuss the urgent issues of theradiological license update, the revision of the operation rules2 and so on.3 The J-PARC license needed to
be updated to accommodate the regulation revision
concerned with the handling and storage of activatedinstruments and materials. In addition, we had to makethe application for upgrading the highest accelerationenergy of the linac from 181 MeV to 400 MeV. As for theoperation rule, significant revision was needed because
the J-PARC organization and the safety management
system were largely modified after the HD incident.
Drafts of the revised rules were prepared in a specialpurpose working group organized under the RSM andproposed to the RSM. The meeting agreed with the proposed revision after it was discussed several times.
The newly organized RSRC held two sessions by
the end of the fiscal year. In the 1st Committee meeting held on December 9, the new safety frameworkof J-PARC and the role of the RSRC were discussed. In
the 2nd Committee meeting, held on January 15, theupdate of the radiological license, and other issues such
The year “2013” is omitted when dates are written in this report.
According to the local radiation protection rule of J-PARC, the operation
rule had been provided for each of the four facilities of the Accelerators,
MLF, HD and Neutrino.
3 The new members of non-J-PARC staff of KEK and JAEA were added to
RSM after the HD incident. During that short period, the meeting washeld nine times.
4 The committee rules and the members of the Radiation Safety Committee
were kept unchanged after the HD incident. The sequential number ofthe committee meetings start from the 15th in this fiscal year.
12

as the installation of a new exhaust system at the HD
hall, were discussed.
The J-PARC Radiation Safety Committee4 met fourtimes during the fiscal year. The 15th Committee meeting on July 31 discussed the statutory report on the
HD incident. This report was submitted to the Nuclear
Regulation Authority (NRA) on August 12, as the 3rd(and last) report on the incident. In the 16th Committee meeting held on October 3, the application forlicense update of J-PARC facilities was discussed. The
main issue was the setup of storage and disposal facilities for activated materials, for which new rules wereintroduced in the radiation regulation law. These applications were submitted to NRA on October 25 andapproved on December 6. The 17th Committee meeting held on October 24 discussed the new radiation
safety system for the revision of local radiation protection rules. The 18th Committee meeting on January 22,2014 discussed the application for the license updatein which the main topic was renovation plans for the
HD facility. The applications were submitted to NRA on
February 19, 2014 and approved on March 19, 2014.

J-PARC Annual Report 2013

Safety59

3. Radiological license update and inspections
During the fiscal year we applied twice to the NRA
for a radiological license update .
Table 1 shows lists of licenses for utilization of radiation generators and radioisotopes at J-PARC at the endof Japanese fiscal year (JFY) 2012 and application items
for new licensing in JFY 2013.
The inspection to confirm the status of the newly
licensed linac facility was conducted successfully on
December 13 by the Nuclear Safety Technology Center(NUSTEC): the items to be inspected were the interlock system and the structure and performance of theshielding.
The inspection of the Materials and Life Science
Experimental Facility was conducted successfully on
March 5, 2014 by NUSTEC: the items to be inspected
were the interlock system and the shielding performance.

Table 1. Licenses at the end of fiscal year 2012 and application items for license for fiscal year 2013.

Facility

Status of license for each facility at theend of fiscal year 2012

Application items for new licensing for
fiscal year 2013

MLF

Proton beam power : 3 GeV/350 kW
Number of neutron beam lines: 18
Number of muon beam lines: 2

New neutron beam line : 1
New muon beam lines: 1

HD

Proton beam power: 30 GeV/50 kW
Number of secondary beam lines(meson): 4

Neutrino facilities

Proton beam power: 30 GeV/450 kW

4. Radiation exposure of J-PARC radiation workers
Figure 1 shows the variation of the number of radiation workers in J-PARC since 2005. In JFY 2013, 3089
individuals were registered as radiation workers in
J-PARC. Table 2 summarizes the distribution of annual
doses for each category of workers. The radiation
exposure of the workers has been monitored individu-

ally with glass dosimeters for photons and solid-state
nuclear track detectors for neutrons. Almost all therecords for individual exposure were undetectable,
while the doses for 157 persons (5.1% of the workers)
were detectable but less than 5.0 mSv.

3500

3113

3089

2012

2013

3000

Number of radiation workers

Male

Female

2653

2633

2010

2011

2500

2154
1864

2000

1500

1000

704
408

500

61
0
2005

2006

2007

2008

2009

Fiscal Year

Fig. 1. Variation of the number of the radiation workers in J-PARC.

Safety

J-PARC Annual Report 2013

60
Table 2. Distribution of annual doses by the type of worker in fiscal year 2013.
Dose range X (mSv)

Collective
dose(person-mSv)

Average
dose
(μSv)

UD

0.1≦X
≦0.5

0.5<X
≦1.0

1.0<X
≦5.0

X >5.0Total
workerIn-house staff

554

37

7

1

0

599

19.4

32.4

User

966

14

2

4

0

616

10.3 (10.3*)

16.7

Contractor

1782

91

1

0

0

1874

27.5

14.7

Total

2932

142

10

5

0

3089

57.2 (18.3*)

18.5* : The number in parentheses is the contribution of the HD incident.

Users OfficeUsers Office

J-PARC Annual Report 2013

62

Users OfficeThat was a nightmare. On May 23, 2013, malfunction of the slow beam extraction system of the “50 GeV”
synchrotron of J-PARC generated extremely dense
protons which were delivered to the gold target of the
Hadron Experimental Facility (HD Facility) damaging
the target and dispersing radioactive material. It might
not have developed into such a nightmare, if adequate
responses had been applied. However, inadequate
responses without grasping what was actually taking
place exacerbated the situation. Consequently, thirtyfour workers were exposed to radiation and radioactive
material was released from the radiation controlled area.
To make matters worse, there was a delay in reportingit to the relevant authorities and the local communities.
We deeply regretted the way we had responded.
However, we must accept the “Arrow of time” whichmeans “one-way direction” or “asymmetry” of time.
Moreover, we must admit there was something wrong
with our attitude toward safety. We should accept theexperience as an opportunity to improve J-PARC. We
needed to conduct thorough investigation to determine the causes, review the safety management systemand procedures to follow in emergency situations andtake measures to prevent similar incidents in the future.
To beef up the safety management system, thepost of a Deputy Director of the J-PARC Center was
created, combining the responsibilities for radiation
safety of each facility and the procedures in emergency
situations. Furthermore, the duties to supervise eachfacility in emergency situations were transferred fromthe deputy director of the J-PARC Center to the person
responsible for the facility management, which allowed
prompt action. In addition, “Alert Status” warning was
created between “Normal Status” and “Emergency
Status”, under which those who were in J-PARC must be
ready for adequate and prompt action.
In response to the improvement, the DVDs for thesafety training were updated. Tests were adopted toensure the users who took the safety training understood the contents. The safety training consisted ofgeneral safety training, specialized safety training foreach facility and J-PARC radiation safety training. The
J-PARC Center Users Office (UO) arranged the safety
training and the tests, and executed them. The tests ofgeneral safety training and specialized safety training
for each facility were executed online. Since prompt
evacuation and prompt emergency call were specifically required in emergency situations, a paper card
was adopted, on which the areas for evacuation and thephone numbers to dial were printed. The J-PARC users
were handed the paper cards, which they must carrywith them during their stay in J-PARC.
It was helpful not only to the J-PARC users but also
to the J-PARC Center members to be informed about thecurrent accelerator operation status. Screens to display
the current accelerator operation status were installedat UO, the Tokai Dormitory, which is a main accommodation for the J-PARC users, the Central Control Buildingof J-PARC, etc.
Along with the above improvements, systemengineers and UO members continuously developed
web-based systems: proposal submission system,
proposal review system, user support system andexperimental report management system. Since many
research proposals were submitted not only from Japanbut also from foreign countries, adopting web-based
systems was necessary to improve the UO operational efficiency. Proposal submission system and user
support system were adopted in 2008, proposal review
system in 2009 and experimental report management
system in 2010. Those systems were improved every
year including the Japanese fiscal year (JFY) 2013 tosmoothly announce the call for proposals, forward
the proposals to referees, notify the applicants of theresults, execute procedures for conduct experiments,
etc.

Other Achievements in JFY 2013
1. User registration and pre-visit procedures:
1)confirmed eligibility of the user registrations,conducted accurate procedures to comply with Foreign
Exchange and Foreign Trade Control Law and approved
the user registrations through the user support system;

2)arranged the Tokai Dormitory bookings in the case theautomatic booking system did not function; 3)booked
other accommodations when the Tokai Dormitory was
fully booked; 4)checked applications for individual
dosimeters; 5)issued temporary Shuttle Bus Passes;

J-PARC Annual Report 2013

Users Office63
4. User Statistics:
1)collected fundamental user statistics; 2)produced
other user statistics when required.

6)checked eligibility of Foreign National Visit Proposals;
7)issued letters of guarantee for visa application; 8)applied for certificates of eligibility for visa application;9)calculated the amount of travel expenses of interuniversity research users whom KEK had accepted.

5. Others:
1)closed the Tokai dormitory’s books every day;2)took sick or injured users to hospitals; 3)booked taxis
or airport limousines; 4)posted announcements aboutuser support system shutdown, blackout, etc.

2. Procedures upon arrival:
1)issued J-PARC User ID Cards; 2)handed users
individual dosimeters; 3)issued car driving permission
passes; 4)issued J-PARC card keys to enter the J-PARC
facilities during off-hours; 5)lent out bikes and handy
phones for internal calls at J-PARC.

Although the radiation exposure and radiation
leak occurred in May, 2013, some users came to J-PARC.
However, their numbers plummeted on June and thelow level continued during JFY 2013. Consequently
the number counted by person-days in JFY 2013 was
21,728, down by about 33% from the previous year.

3. Post-visit Procedures:
1)checked MLF machine time completion forms
or MLF experimental reports submitted by users andforwarded them to persons who had responsibilities forapproving them.

(1) Users in 2013 (according to organizations, person-days)

Foreign
Organizations

Japanese
Universities

9,758

9,725

870 1,375

Private Enterprises

Public Organizations

2,500
Japanese Universities
2,000

Public Organizations

1,500

Private Enterprises

1,000

Foreign Organizations

500
0
4
2013

5

6

7

8

9

10

11

12

1
2014

2

3

Users Office

J-PARC Annual Report 2013

64(2) Users in 2013 (according to facilities, person-days)

Accelerator
1,213

MLF
7,671

Neutrino
9,574

Hadron
3,270

2,000
1,800
1,600
1,400
1,200
1,000
800
600
400
200
0

MLF
HadronNeutrino
Accelerator

4
5
2013

6

7

8

9

10

11

12

1 2
2014

3

(3) Users in 2013 (Japanese・Foreigners, person-days)
5,000
4,500

Foreigners

4,000Japanese

3,500
3,000
2,500
2,000
1,500
1,000
500
0
4
2013

5

6

7

8

9

10

11

12

1
2014

2

3

User Program

User Program

J-PARC Annual Report 2013

66

Overview of MLF Use(1) Basic policy of the MLF use
The Materials and Life Science Experimental Facility(MLF) is available to Japanese and overseas users forboth academic research and industrial applications.
The following peer review systems are introduced
for fair, clear and user-oriented facility management:
User Consultative Committee, Neutron/Muon Science
Proposal Review Committee, and Neutron/Muon
Science Instrument Review Committee. All nonproprietary proposals are reviewed and ranked by the
Neutron/Muon Program Review Committee. The J-PARC
Center is responsible for the beamtime allocation for
approved proposals.

maintain their beamline instruments.
Beamtime provided to the J-PARC users is classified into three categories: one managed by the
J-PARC Center, one managed by a third-party, and one
managed by CROSS-Tokai. The third-party must supply
to the J-PARC Center a little portion of its full beamtime in exchange for having exclusive rights to use thebeamline instruments.
Therefore, the J-PARC user program is carried out
using all the beamtime for the instruments owned by
JAEA or KEK and part of the beamtime for those ownedby the third parties. The proposals for the MLF use
program are reviewed uniformly and openly.

(2) Registered Institution for Facility Use Promotion (RIFUP)
Consistent with its longstanding policy of
promoting open access to major publicly-funded
research facilities, the Japanese Government in July2009 designated the accelerators (linac and 3 GeV
proton synchrotron) and some beamlines at J-PARC
MLF as Public Neutron Beam Facility under the termsof the so-called “Public Use Promotion” legislation. The
aim of the legislation is to advance science and technology through the effective promotion and operationof general user access program at designated largescale research facilities. The legislation requires that theuser program on the Public Beamlines be managed andsupported by an independent, third-party organization. This organization is known as RIFUP.
Comprehensive Research Organization for Scienceand Society (CROSS) applied for RIFUP in February
2011 and was allowed by the Minister of the Ministryof Education, Culture, Sports, Science and Technology(MEXT) to operate as RIFUP. Accordingly, CROSS
commenced its operation on the 1st of April, 2011, at
its Tokai office in the Ibaraki Quantum Beam ResearchCenter (IQBRC) adjacent to the J-PARC site.

(4) MLF Access modes(a) Beamtime managed by the J-PARC Center
There are three access modes to obtain outstanding
scientific results or to meet the various needs of users:
general use, project use and instrument group use. An
applicant to general use must be an employee of oraffiliated with a legal organization or entity that may
be any of the following: a public or private college,
university or other institute of higher education, apublic or not-for-profit research organization, or a
private company. A postdoctoral fellow is also eligible
to submit proposals with the permission of his/hermanager or supervisor at the home institute/organization to conduct research activities at MFL. Project use
is the access mode in which JAEA or KEK conducts its
mission-oriented programs such as inclusive scientific research projects or research programs proposed
to fulfill plans to achieve midterm goals of JAEA, joint
research programs and contract research programswith other institute(s)/organization(s). Experiment
proposals requesting beamtime longer than one year
may be acceptable for the project use. Only personnel
belonging to either JAEA or KEK or a person approvedby the director of the J-PARC Center can apply for
project use. Instrument group use is the access modein which the scientists responsible for the instruments
maintain them in good condition and/or develop theirperformances to provide the J-PARC users with themost superior experimental environments.
(b) Beamtime managed by a third party-Ibaraki Prefecture
Ibaraki Prefecture constructed, for industrial
application research, the Ibaraki Biological Crystal
Diffractometer BL03(iBIX) and the Ibaraki Materials
Design Diffractometer BL20(iMATERIA).

(3) MLF Instrument Use
There are 23 neutron beam extraction ports for thepulsed spallation neutron source and 4 muon extraction channels for the muon target at MLF.
Not only can JAEA or KEK, the parent organizationsof J-PARC, construct instruments for conducting experiments using the neutron and the muon beams, but
third parties can do it too. However, the manufacturersof the instruments at MLF are obliged to manage andJ-PARC Annual Report 2013

User Program

67
There are three access modes: Industrial Use Open
Projects, Prefectural Projects and Urgent Use. Industrial
Use Open Projects are classified into two types of uses:
regular-interval use for which projects are accepted ineither the first or the second half of the year and occasional use for which projects are accepted as late as
about one month prior to the date the desired cycle
starts. Prefectural Projects are for industry-academicgovernment collaboration research led by Ibaraki
Prefecture or for promoting an advantage of neutron
use to a certain industry. Urgent Use is for projects moreurgent than the regular ones.
(c) Beamtime managed by CROSS-TokaiCROSS-Tokai manages and supports the user
program on the six neutron Public Beamlines (BL01,
BL02, BL11, BL15, BL17, BL18). There are six kinds ofaccess modes for these Beamlines.
1) General Use
General Use access works in exactly the same way
for the Public Beamlines as it does for all other MLF
instruments. This is the appropriate access mode formost researchers wishing to use the neutron Public
Beamlines at J-PARC MLF.
To encourage and provide access to the widest
possible range of users, General Use is, in principle,
open to all local and international researchers, whowish to exploit the neutron beams and instrumentsin their research programs. Proposals are welcomedfrom researchers with academic, government or
private research affiliations.
2) Elements Strategic Use
The government project to generate materials
which serve as alternatives to rare materials, suchas rare earth or rare elements, started in 2012. There
are four categories in the project: magnet materials,
catalytic or battery materials, electronic materials
and construction materials. Elements Strategic Use is
aimed at promoting that project.
3) Trial Use
Trial Use is aimed at assisting novice users ofneutron-based experimental techniques to gain
experience and expertise that will allow them tobecome independent General Use applicants inthe future. It may also be used for first-time usersof pulsed neutrons to determine the experimental
feasibility.
The Trial Use framework offers a wide range ofservices to potential new users, including support
and guidance provided by a CROSS-Tokai Science
Coordinator.

4) Director’s Discretion
A proportion of the total available beamtime
is reserved for allocation at the discretion of the
Director of CROSS-Tokai. This time may be allocatedto urgent proposals that warrant expedited access orused for approved outreach or education activities
of CROSS-Tokai.
5) CROSS-Tokai Research
In this access mode, members of the Neutron
R&D Division of CROSS-Tokai can apply for beamtime to carry out research aimed at developing andadvancing research activities on the Public Beamlines. Proposals with strong scientific objectives that
expand the range of facility usage will be assessed
and ranked together with General Use proposals.
6) Facility Use
To ensure that instruments with the highest
possible performance and capability are available
to users, this access mode allows members of thebeamline group to carry out work associated withthe maintenance, development and testing of the
instruments. This access mode also facilitates the useof beamlines for approved research projects of thebeamline owner organization (JAEA).
(5) Call for General Use Proposals to access theneutron and muon beamlines
The J-PARC Center and CROSS-Tokai announced
the Call for General Use Proposals to access the neutron
and muon beamlines in the 2013A and 2013B operations periods.
Call for proposals for the first half of 2013 (2013A term):
October 17 - November 7, 2012
The review results were announced on March 25, 2013.
Call for proposals for the second half of 2013 (2013B
term): May 17 - July 8, 2013
The review results were announced on December 6,
2013.
(6) Basic Concept of Nonproprietary Use
Research results obtained through J-PARC use
should be shared widely by people all over the world,which enable us to step into the unknown world
effectively and efficiently. Based on this idea, no beamtime fee is charged as long as the research results are
published for public viewing.

User Program

J-PARC Annual Report 2013

68

ProposalProposal
Review System
for System
MLF
Review
for MLF
The JAEA-KEK-CROSS Agreement of Cooperation on the Promotion of Public Utilizationof the Speciﬁc Neutron Beam Facilities at J-PARC (Enacted on 1 April 2011)

J-PARC
Center(JAEA/KEK)

Collaboration
Committee

Director
J-PARC

Muon Science
Proposal Rev. Comm.

Public Beamlines Only

MLF Advisory
Board

Selection
Committee

Task Forces

Public Beamlines Only

Neutron Science
Proposal Rev. Comm.

Proposal
Evaluation Comm.

Joint Meeting

Muon
Instrument
Proposals(CROSS)All except Public
Beamlines

Contract Beamlines
Only

Neutron Instrument Contract Beamline
Proposal Rev. Comm. Evaluation Comm.

Registered
Institution

Director
CROSS-Tokai

All except Public Beamlines

All except Contract
Beamlines
Muon Instrument
Proposal Rev. Comm.

President
CROSS

President
JAEA

Director General
KEK

Joint Meeting

Neutron Instrument
Proposals

Public Beamlines Only
All except Public Beamlines
Neutron Program
JAEA Research
CROSS Development
Advisory
Proposal Advisory Proposal Evaluation
Committee
Committee
Panel
Joint Meeting

Muon Program
Advisory Comm.

Muon Scientiﬁc Proposals

Neutron Scientiﬁc Proposals

UniﬁedAccess Point

ALL Proposals submitted via the J-PARC Users Oﬃce

MLF Proposal Summary - FY2013
Table 1. Breakdown of Proposal Numbers for the 2013A & 2013B Rounds.
Beamline

Instrument

BL01 4D-Space Access Neutron Spectrometer - 4SEASONS
BL02 Biomolecular Dynamics Spectrometer - DNA(100-b)‡
BL03 Ibaraki Biological Crystal Diffractometer - iBIX(b)†
Accurate Neutron-Nucleus Reaction Measurement
BL04
Instrument - ANNRI
BL05 Neutron Optics and Physics - NOP
BL08 Super High Resolution Powder Diffractometer - S-HRPD
Special Environment Neutron Powder Diffractometer
BL09- SPICA
BL10
BL11
BL12
BL14
BL15

2013A
Submitted
Approved
GU
PU/S IU
GU
PU/S
3
2 10(1+)3
12(1+)
3
2
7(1#)
3
13(1#)
6
0
0
4
0
0
14
0
0
9

2013B
Submitted
Approved
IU
GU
PU/S IU
GUPU/S
2 13(1#, 1+)3
2 5(1#, 1+) 3
2 10(1#)
3
2
3(1#)
3
0
4
0
0
1
0
0
0
14
0
0
9

IU
2
2
0
0

6

1

1

6

1

1

6

1

1

4

1

1

1
12

1
1

0
0

1
9

1
1

0
0

4
13

1
1

0
0

3
3

1
1

0
0

0

1

0

0

1

0

0

1

0

0

1

0

2

1

7

2

1

18

2

1

5

2

1

1
1
2

0
0
1

0
2
11

1
1
2

0
0
1

11
11
19

1
1
2

0
0
1

7
2
6

1
1
2

0
0
1

6

3

22(2#, 1+)

6

330(2#, 1+)

6

3

9(2#, 1+)

6

3

Neutron Beamline for Observation and Research Use 8
NOBORU
High-Pressure Neutron Diffractometer - PLANET
0High Resolution Chopper Spectrometer - HRC
2
Cold-neutron Disk-chopper Spectrometer - AMATERAS
23
Small and Wide Angle Neutron Scattering Instrument27(2#, 1+)- TAIKAN

J-PARC Annual Report 2013

User Program

69
Beamline

Instrument

BL16

High-Performance Neutron Reflectometer with a horizontal Sample Geometry - SOFIA

BL17 Polarized Neutron Reflectometer - SHARAKU
Extreme Environment Single Crystal Neutron DiffracBL18
tometer - SENJUBL19 Engineering Diffractometer - TAKUMI(100-b)‡Ibaraki Materials Design Diffractometer BL20
iMATERIA(b)†
BL21 High Intensity Total Diffractometer - NOVA
D1 Muon D1
D2 Muon D2
U Muon U
Subtotal
Total

2013A
Submitted
Approved
GU
PU/S IU
GU
PU/S IU

2013B
Submitted
Approved
GU
PU/S IU
GU
PU/S IU

16

1

0

15

1

0

12

#

9(1 )

3

3

9(1 )

3

1

11

2

3

8

2

31(1+)
14
0
12
20
6
0
229

3
0
31
1
1
0
1
79
327

1
0
0
0
1
1
0
19

16(1+)
6
0
12
19
5
0
169

3
0
25
1
1
0
1
68
253

#

1

0

7

15(1 )

3

3

2

22

2

1
0
0
0
1
1
0
16

25
12
0
22
19
13
0
279

3
0
27
1
1
1
1
76
373

#

1

0

5(1 )

3

1

3

4

2

2

1
0
0
0
1
0
0
18

5
3
0
5
5
5
0
87

3
0
23
1
1
1
1
67
169

1
0
0
0
1
0
0
15

#

GU : General Use
PU : Project Use or Ibaraki Pref. Project Use
IU : Instrument Group Use
S : S-type Proposals† : Ibaraki Pref. Exclusive Use Beamtime (β = 80% in FY2012)‡ : J-PARC Center General Use Beamtime (( 100-β = 20% in FY2012)# : Proposal Numbers under Trial Use Access System in GU+ : Proposal numbers under Element Strategy in GU

400
350
Proposals

300
250
200
150
100
50
0

114

74

235

253

28
16
34

124

67
2008

2009A

21

21
4

150

159

2010A

2010B

90
2009B

204

33
12

166

225

169

89

2011A 2011B 2012A 2012B 2013A
Proporsal Round
Figure 1. MLF Proposal Numbers over Time.

2013B

Table 2. Principal Investigator Affiliations in FY2013.
Universities(Japan)

JAEA

Companies(Japan)KEK

Foreign Organizations

Research Institutes(Japan)

289

154

84

40

55

78

Research
Institute (Japan)
11%
Foreign
Organization
8%
KEK
6%

Companies(Japan)
12%

Universities(Japan)
41%
JAEA
22%

Universities (Japan)
JAEA
Companies (Japan)
KEK
Foreign Organizations
Research Institutes (Japan)

Figure 2. Origin of Proposals in FY2013.

Not Approved
Approved

User Program

J-PARC Annual Report 201370
Table 3. Proposals by Sub-committee/Expert Panel – FY2013A.
Sub-committee
Expert Panel

P1

P2

P3

P4

P5

P6

P7

P8

P9

P10

Q1

Q2

N/A

No. of Proposals

57

15

21

11

46

5

24

12

4

3

8

18

103

P9
2%

P8
5%

Q1
P10 4%
1%

Q2
8%

P1
25%

P7
11%
P5
21%

P6
2%

P2
7%
P3
9%

P4
5%

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
P9: Trtial Use
P10: Element Strategy
Q1: Magnetic and Strongly Correlated Electronic Materials
Q2: Chemical Physics and General Science

Figure 3. Submitted Proposals by Sub-committee/Expert Panel – FY2013A.

Table 4. Proposals by Sub-committee/Expert Panel – FY2013B.
Sub-committee
Expert Panel

P1

P2

P3

No. of Proposals

66

16

35

P10
P9 1%
2%

P4

Q1
5%
P7
12%

P6
11%

Q2
9%

P5
31%

P1
29%

P2
7%
P3
16%

P5

P6

P7

70

24

27

P8

P9

P10

Q1

Q2

N/A

5

2

11

21

96

P1:Materials Science and Engineering
P2:Energy Science
P3:Soft Matter, Biomaterials and Liquids
P4:(Reserved)
P5:Magnetism and Strongly Correlated Electron Systems
P6:Fundamental Physics, Nuclear Science and Instrument R&D
P7:Industrial Applications
P8:(Reserved)
P9:Trial Use Access Program
P10: Element Strategy
Q1:Electronic Properties of Matter
Q2:Hydrogen in Matter & General Applications

Figure 4. Submitted Proposals by Sub-committee/Expert Panel – FY2013B.

J-PARC Annual Report 2013

User Program71

Proposal Review System for Nuclear and Particle Physics
Experiments at the J-PARC “50 GeV” Proton Synchrotron① Proposal Submission② Evaluation Request③ Evaluation Request④ Evaluation Result⑤ Evaluation Report⑥ Result Announcement

Institute of Particle and Nuclear Studies (IPNS) at KEK

Council for IPNS②

Elect the PAC members

J-PARC Center
IPNS
Director

Program Advisory Committee
(PAC)

⑤
⑥

①

③
④

J-PARC User

The 17h Program Advisory Committee (PAC) meeting was held on September 25 - 27, 2013.

Approval Summary of the Nuclear and Particle Physics
Experiments after the 17th PAC Meeting (September 25, 2013)(Co-)
Spokespersons
E03 K. Tanida
P04

J.C. Peng,
S. Sawada

E05 T. Nagae
E06 J. Imazato
K. Imai,
E07 Nakazawa,
H. TamuraAffiliation
SNU

Title of the experiment
Measurement of X rays from X- Atom

U of Illinois at Urbana- Measurement of High-Mass Dimuon Production at theChampaign, KEK
50-GeV Proton Synchrotron
Spectroscopic Study of X-Hypernucleus, 12XBe, via the
Kyoto U
12C(K-, K+) Reaction
Measurement of T-violating Transverse Muon
KEK
Polarization in K+ -> p0 m+ n Decays
JAEA,
Systematic Study of Double Strangeness System with an
Gifu U,
Emulsion-counter Hybrid Method
Tohoku U

Slow line priority
Approval
status (PAC
Day1 Beamline
recommendation) Day1? Priority
Stage 2

K1.8

DeferredPrimary

Stage 2

K1.8
K1.1BR

Stage 2

K1.8

Stage 1

K1.8

Pion double charge exchange on oxygen at J-PARC

A. Sakaguchi,
E10
T. Fukuda

Osaka U,
Osaka EC U

E11 T. Kobayashi

KEK

Production of Neutron-Rich Lambda-Hypernuclei with theStage 2
Double Charge-Exchange Reaction (Revised from Initial P10)
Tokai-to-Kamioka (T2K) Long Baseline Neutrino
Stage 2
Oscillation Experimental Proposal

E13 H. Tamura

Tohoku U

Gamma-ray spectroscopy of light hypernuclei

Stage 2

E14 T. Yamanaka

Osaka U

Proposal for KL -> p n n-bar Experiment at J-PARC

Stage 2

M. Iwasaki,
E15
T. Nagae

RIKEN,
Kyoto U

E16 S. Yokkaichi

RIKEN

A Search for deeply-bound kaonic nuclear states by inflight 3He(K-, n) reaction
Electron pair spectrometer at the J-PARC 50-GeV PS to
explore the chiral symmetry in QCD

R. Hayano,
H. Outa
H. Bhang,
E18 H. Outa,
H. Park

U Tokyo,
RIKEN
SNU,
RIKEN,
KRISS

E17

1

Stage 1

E08 A. Krutenkova ITEP

0

Day1

Stage 2K1.8
neutrino
Day1

Stage 2

Coincidence Measurement of the Weak Decay of 12LC
and the three-body weak interaction process

Stage 2

K1.8
KL

Day1

Stage 1

Precision spectroscopy of Kaonic 3He 3d->2p X-rays

2

K1.8BR
High pDay1

K1.8BR
K1.8

User Program

J-PARC Annual Report 2013

72
(Co-)
Spokespersons

Affiliation

E19 M. Naruki

KEK

E21 Y. Kuno

Osaka UE22

S. Ajimura,
A. Sakaguchi

Osaka U

T25 S. Mihara

KEK

E26 K. Ozawa

KEK

E27 T. Nagae

Kyoto U

E29 H. Ohnishi

RIKEN

E31 H. Noumi

Osaka U

T32 A. Rubbia

ETH, Zurich

P33 H.M. Shimizu

Nagoya U

E34

N. Saito,
M. Iwasaki

KEK,
RIKEN

E36

M. Kohl,
S. Shimizu

Hampton U,
Osaka U

E40 K. Miwa

Tohoku U

P41 M. Aoki

Osaka U

E42 J. K. Ahn

Pusan National U

E45

K.H. Hicks,
H. Sako

Ohio U, JAEA

Title of the experimentHigh-resolution Search for Q+ Pentaquark in p-p -> K-X
Reactions
An Experimental Search for μ − e Conversion at a
Sensitivity of 10−16 with a Slow-Extracted Bunched Beam
Exclusive Study on the Lambda-N Weak Interaction in
A=4 Lambda-Hypernuclei (Revised from Initial P10)
Extinction Measurement of J-PARC Proton Beam at
K1.8BR
Search for ω-meson nuclear bound states in the p-+AZ ->n+(A-1)ω(Z-1) reaction, and for ω mass modification in the
in-medium ω->π0γ decay
Search for a nuclear Kbar bound state K-pp in the d(p+,K+) reaction
Search for φ-meson nuclear bound states in the pbar +AZ -> φ + (A-1)φ(Z-1) reaction
Spectroscopic study of hyperon resonances below KN
threshold via the (K-,n) reaction on DeuteronTowards a Long Baseline Neutrino and Nucleon Decay
Experiment with a next-generation 100 kton Liquid
Argon TPC detector at Okinoshima and an intensity
upgraded J-PARC Neutrino beam
Measurement of Neutron Electric Dipole Moment

Slow line priority
Approval
status (PAC
Day1 Beamline
recommendation) Day1? Priority
Stage 2

Day1

Stage 1

New
beamline

Stage 1

K1.8

Test
Experimentwill be coordinatedby JPNC

K1.8BR

Stage 1

K1.8

Stage 2

K1.8

Stage 1

K1.1

Stage 2

K1.8BR

Test
Experimentschedule andbeam time will
be coordinatedby JPNC

Deferred

K1.1BR

Linac

An Experimental Proposal on a New Measurement of theMuon Anomalous Magnetic Moment g-2 andStage 1
Electric Dipole Moment at J-PARC
Measurement of Γ(K+ -> e+ ν)/Γ(K+ -> μ+ ν) and Search forStage 2heavy sterile neutrinos using the TREK detector system
Measurement of the cross sections of Σp scatterings

K1.8

MLF
K1.1BR

Stage 1

K1.8

An Experimental Search for μ - e Conversion in Nuclear Field
Deferred
at a Sensitivity of 10-14 with Pulsed Proton Beam from RCS
Search for H-Dibaryon with a Large Acceptance Hyperon
Stage 1
Spectrometer
3-Body Hadronic Reactions for New Aspects of Baryon
Stage 1
Spectroscopy

MLF
K1.8
K1.8

T46 K. Ozawa

KEK

EDIT2013 beam test program

Test
Experiment

K1.1BR

T49 T. Maruyama

KEK

Test for 250L Liquid Argon TPC

Test
Experiment

P50 H. Noumi

Osaka U

Charmed Baryon Spectroscopy via the (π, D*-) reaction

Deferred

T51 S. Mihara

KEK

Research Proposal for COMET(E21) Calorimeter
Prototype Beam Test

Test
Experiment(had to be
stopped)K1.1BR

T52 Y. Sugimoto

KEK

Test of fine pixel CCDs for ILC vertex detector

Test
Experiment(not performed
yet)

K1.1BRT53 D. Kawama

RIKEN

Test of GEM Tracker, Hadron Blind Detector and Leadglass EMC for the J-PARC E16 experiment

Test
Experiment(not performed
yet)

K1.1BR

T54 K. Miwa

Tohoku U

Test experiment for a performance evaluation of ascattered proton detector system for the Σpscattering experiment E40

Test
Experiment(not performed
yet)

K1.1BR

T55 A. Toyoda

KEK

Second Test of Aerogel Cherenkov counter for the
J-PARC E36 experiment

Test
Experiment(had to be
stopped)K1.1BRP56 T. Maruyama

KEK

A Search for Sterile Neutrino at J-PARC Materials and Life
Science Experimental Facility

Deferred(not performed
yet)

K1.1BR
High pMLF

Organization and Committees

Organization and Committees

J-PARC Annual Report 201374

Organization Structure
J-PARC Center Organization Chart
as of April 1, 2013

Accelerator Section I
H. OguriAccelerator Section II
M. Kinsho
Accelerator Section III
N. OuchiDirector’s Oﬃce

Advisor (J-PARC): S. Nagamiya
Advisor (Neutron): K. Kakurai
Advisor (Safety): T. Shibata
Advisor (International Relations):
T. K. Ohska
Leader (International Relations):
Y. Watanabe

Accelerator Division
T. Koseki - K. Hasegawa

Accelerator Section IV
K. Kikuchi
Accelerator Section V
Y. Hori
Accelerator Section VI
N. Yamamoto
Accelerator Section VII
F. Naito
Neutron Source Section

Deputy Director(JAEA)

H. Takada – Y. Kasugai
Neutron Science Section

T. KatoT. Kamiyama – Y. Kawakita

Materials & Life Science
Division

Director

M. Arai – H. Seto, M. Futakawa

Y. Ikeda

Neutron Instrumentation Section
K. Soyama
Muon Science Section
Y. Miyake

Particle & Nuclear Physics
Division
Deputy Director(KEK)

Technology Development Section
K. Aizawa – T. Oku

K. H. Tanaka – T. Kobayashi
Transmutation Section
H. Oigawa – T. Sasa

N. Saito

Cryogenics Section
T. Ogitsu – Y. Makita
Radiation Safety Section

Safety Division
T. Miura – H. Nakashima

Y. Miyamoto – M. Numajiri
General Safety Section
T. Kihara – Y. Nakane
Operations Support Section
H. Yoshikawa
Information System Section
A. Manabe – K. Gorai
Public Relations Section
S. Sakamoto

When applicable
Leader – Sub Leader

General Aﬀairs Section

Administration Division
K. Ojima – T. Ikeda

T. Ikeda – H. Morita
Users Aﬀairs Section
S. Takeuchi – T. Kodama
Users Oﬃce

K. Kokufuda

J-PARC Annual Report 2013

Organization and Committees

75

Members of the Committees Organized for J-PARC(as of March, 2013)

1) Steering Committee
Yujiro Ikeda

J-PARC Center, Japan

Kazuhisa Kakurai

Japan Atomic Energy Agency, Japan

Satoru Kondo

Japan Atomic Energy Agency, Japan

Hideki Namba

Japan Atomic Energy Agency, Japan

Masaharu Nomura

High Energy Accelerator Research Organization, Japan

Katsunobu OideHigh Energy Accelerator Research Organization, Japan

Takayuki Sumiyoshi

High Energy Accelerator Research Organization, Japan

Yasuhide Tajima

Japan Atomic Energy Agency, Japan

Hiroshi Uetsuka

Japan Atomic Energy Agency, Japan

Kazuyoshi YamadaHigh Energy Accelerator Research Organization, Japan

Masanori Yamauchi

High Energy Accelerator Research Organization, Japan

2) International Advisory Committee
Hamid Aït Abderrahim

Belgian Nuclear Research Center, Belgium

Hiroshi Amitsuka

Hokkaido University, Japan

Kelly Beierschmitt

Oak Ridge National Laboratory, USA

Sergio Bertolucci

European Organization for Nuclear Research, Switzerland

Shinian Fu

Institute of High Energy Physics, Chinese Academy of Science, China

Hidetoshi Fukuyama

Tokyo University of Science, Japan

Donald Geesaman

Argonne National Laboratory, USA

Hugh Montgomery

Thomas Jefferson National Accelerator Facility, USA

Jean-Michel Poutissou

Canada's National Laboratory for Particle and Nuclear Physics, Canada (chair)

Robert Robinson

Australian Nuclear Science and Technology Organization, Australia

Thomas Roser

Brookhaven National Laboratory, USA

Hoerst Stoecker

GSI Helmholtz Centre for Heavy Ion Research, Germany

Andrew Taylor

Science and Technology Facilities Council, UK

Robert Tschirhart

Fermi National Accelerator Laboratory, USA

Hajimu Yamana

Kyoto University. Japan

Organization and Committees

J-PARC Annual Report 2013763) User Consultative Committee for J-PARC
Masatoshi AraiJapan Atomic Energy Agency, Japan

Yasuhiko Fujii

Comprehensive Research Organization for Science and Society, Japan

Makoto Hayashi

Ibaraki Prefecture, Japan

Tomohiko Iwasaki

Tohoku University, Japan

Toshiji Kanaya

Kyoto University, Japan

Yoshiyuki Kawakami

Eisai Co., Ltd., Japan

Yoshiaki Kiyanagi

Nagoya University, Japan

Takashi Kobayashi

High Energy Accelerator Research Organization, Japan

Yoji Koike

Tohoku University, Japan

Sachio Komamiya

University of Tokyo, Japan

Yasuhiro Miyake

High Energy Accelerator Research Organization, Japan

Junichirou Mizuki

Kwansei Gakuin University, Japan

Tomofumi Nagae

Kyoto University, Japan

Takashi Nakano

Osaka University, Japan

Tsuyoshi Nakaya

Kyoto University, Japan

Nobuyuki OsakabeCentral Research Laboratory, Hitachi, Ltd., Japan

Taku Sato

Tohoku University, Japan

Shinya Sawada

High Energy Accelerator Research Organization, Japan

Masaaki Sugiyama

Kyoto University, JapanJun Sugiyama

Toyota Central R&D Labs., Inc., Japan

Hirokazu Tamura

Tohoku University, Japan

Kazuhiro Tanaka

High Energy Accelerator Research Organization, Japan

Eiko Torikai

Yamanashi University, Japan

Taku Yamanaka

Osaka University, Japan

Satoru Yamashita

University of Tokyo, Japan

4) Accelerator Technical Advisory Committee
Alberto Facco

National Institute of Nuclear Physics, Italy

Roland Garoby

European Organization for Nuclear Research, Switzerland

Alan Letchford

Rutherford Appleton Laboratory, UK

Subrata Nath

Los Alamos National Laboratory

Akira Noda

National Institute of Radiological Sciences, Japan

Michael Plum

Oak Ridge National Laboratory, USA

Thomas Roser

Brookhaven National laboratory, USA (chair)

Jie Wei

Michigan State University, USA

Robert Zwaska

Fermi National Accelerator Laboratory, USA

J-PARC Annual Report 2013

Organization and Committees

775) Neutron Advisory Committee
Kurt Clausen

Paul Scherrer Institut, Switzerland

Phillip Ferguson

Oak Ridge National Laboratory, USA

Toshiji Kanaya

Kyoto University, Japan

Mahn Won Kim

Korea Advanced Institute of Scienee and Technology, Korea

Yoshiaki Kiyanagi

Nagoya University, JapanDan Neumann

National Institute of Standards and Technology, USA

Robert Robinson

Australian Nuclear Science and Technology Organization, Australia

Uschi Steigenberger

ISIS, Rutherford Appleton Laboratory, UK (Chair)

Werner Wagner

Paul Scherrer Institute, Switzerland

6) Muon Science Advisory Committee
Hiroshi Amitsuka

Hokkaido University, Japan

Toshiyuki Azuma

Institute of Physical and Chemical Reserch, Japan

Klauss Jungmann

University of Groningen, Netherland

Elvezio Morenzoni

Paul Scherrer Institute, Switzerland (chair)

Yasuo Nozue

Osaka University, Japan

Francis Pratt

ISIS, Rutherford Appleton Laboratory, UK

Jeff E. Sonier

Simon Fraser University, Canada

Jun Sugiyama

Toyota Central R&D Labs., Inc., Japan

7) Radiation Safety Committee
Yoshihiro Asano

Institute of Physical and Chemical Reserch, Japan

Shuichi Ban

High Energy Accelerator Research Organization, Japan

Yukihide Kamiya

High Energy Accelerator Research Organization, Japan

Satoru Kondo

Japan Atomic Energy Agency, Japan

Takeshi Murakami

National Institute of Radiological Science, Japan

Tetsuo Noro

Kyushu University, Japan

Shinichi Sasaki

High Energy Accelerator Research Organization, Japan

Seiichi Shibata

Kyoto University, Japan (chair)

Yoshitomo Uwamino

Institute of Physical and Chemical Reserch, Japan (Deputy Chair)

Takenori Yamaguchi

Japan Atomic Energy Agency, Japan

Yoshihiro Yamaguchi

Japan Atomic Energy Agency, Japan

Organization and Committees

J-PARC Annual Report 2013788) MLF Advisory Board
Jun Akimitsu

Aoyama Gakuin University, Japan

Masatoshi AraiJapan Atomic Energy Agency, Japan

Koichiro Asahi

Tokyo Institute of Technology, Japan

Yasuhiko Fujii

Comprehensive Research Organization for Science Society, Japan

Masatoshi Futakawa

Japan Atomic Energy Agency, Japan

Makoto Hayashi

Ibaraki Prefecture, Japan

Shinichi Ito

High Energy Accelerator Research Organization, Japan

Ryosuke KadonoHigh Energy Accelerator Research Organization, Japan

Takashi Kamiyama

High Energy Accelerator Research Organization, Japan

Toshiji Kanaya

Kyoto University, Japan

Mikio Kataoka

Nara Institute of Science and Technology, Japan

Takashi KatoJapan Atomic Energy Agency, Japan

Yukinobu Kawakita

Japan Atomic Energy Agency, Japan

Kazuya Aizawa

Japan Atomic Energy Agency, Japan

Yoji Koike

Tohoku University, Japan

Yasuhiro Miyake

High Energy Accelerator Research Organization, Japan

Toshiya Ohtomo

High Energy Accelerator Research Organization, Japan

Taku Sato

Tohoku University, Japan

Hideki Seto

High Energy Accelerator Research Organization, Japan

Mitsuhiro Shibayama

University of Tokyo, Japan (Chair)

Masaaki Sugiyama

Kyoto University, JapanJun Sugiyama

Toyota Central R&D Labs., Inc., Japan

Wataru Utusmi

Japan Atomic Energy Agency, Japan

Toshio Yamaguchi

Fukuoka University, Japan (Deputy Chair)

9) Program Advisory Committee (PAC) for Nuclear and Particle Physics Experiments at the J-PARC 50 GeV Proton
Synchrotron
Edward Blucher

University of Chicago, USA

Thomas Browder

University of Hawaii, USA

Akinobu DoteHigh Energy Accelerator Research Organization, Japan

Junji Haba

High Energy Accelerator Research Organization, Japan (Chair)

Kenichi ImaiJapan Atomic Energy Agency, Japan

Kunio Inoue

Tohoku University, Japan

Gino Isidori

Frascati National Laboratories, Italy

Tadafumi Kishimoto

Osaka University, Japan

Konrad Kleinknecht

Mainz University, Germany

William C. Louis III

Los Alamos National Laboratory, USA

Tomofumi Nagae

Kyoto University, Japan

Matthias Gross Perdekamp

University of Illinois, USA

Hiroyoshi Sakurai

University of Tokyo, Japan

Hajime Shimizu

Tohoku University, Japan

Wolfram Weise

European Center for Theoretical Studies in Nuclear Physics and Related Areas,
UkraineMain Parameters

Main Parameters

J-PARC Annual Report 2013

80
Present main parameters of Accelerator
Linac
Acclerated. Particles
EnergyPeak Current
Pulse Width
Repetition Rate
Freq. of RFQ, DTL, and SDTL
Freq. of ACS

Negative hydrogen
400 MeV
15 mA
0.5 ms
25 Hz
324 MHz972 MHzRCS

Circumference
Injection Energy
Extraction Energy
Repetition Rate
RF Frequency
Harmonic Number
Number of RF cavities
Number of Bending Magnet

348.333 m
400 MeV
3 GeV
25 Hz
0.938 MHz → 1.67 MHz2
12
24
Main Ring

Circumference
Injection Energy
Extraction Energy
Repetition Rate
RF Frequency
Harmonic Number
Number of RF cavities
Number of Bending Magnet

1567.5 m
3 GeV
30 GeV~0.4 Hz1.67 MHz → 1.72 MHz
9896

Key parameters of Materials and Life Science Experimental Facility
Injection Energy

3 GeV

Repetition Rate

25 Hz
Neutron Source

Target Material
Number of Moderators
Moderator Material
Moderator Temperature/Pressure
Number of Neutron Beam Ports

Mercury
3
Supercritical hydrogen
20 K / 1.5 MPa
23

Muon Production Target
Target Material
Number of Muon Beam Extraction Ports

Graphite4

Neutron Instruments*
Available for User Program (General Use)
Under Commissioning/Construction

17
1/3

Muon Instruments*
Available for User Program (General Use)(* As of March, 2014)2

Events

Events

J-PARC Annual Report 201382

EventsThe Incident at the J-PARC Hadron Experimental Facility (May 23)
Due to a malfunction of the beam extraction system of the 50 GeV synchrotron, a proton beam was delivered to the gold target of the Hadron facility within avery short time. As a result, the gold target had momentarily reached an extremely high temperature and partof it was damaged. Radioactive material then leaked

into the hadron experimental hall and some workers
were exposed to radiation externally and/or internally.
Operation of the ventilation fans of the hall resulted in
the leak of radioactive material out of the radiation controlled area of the Hadron Experimental Facility.

Meetings for Local Residents Held inTokai Village to Explain the Recent
Incident (June 13-15)
Over the three days from June 13 to 15, meetings
were held in Tokai Village to explain the radioactive material leak incident at the Hadron Experimental Facility. The
J-PARC Center apologized for causing the incident, andprovided a basic overview of what happened. The executives of the Center listened carefully to what every single
person had to say.

The meeting on June 15

Meetings of External Experts Panel to Verify the Radioactive Material Leak Incident(June 21, July 5, 20, 29, August 9, 22)
In response to the request by the Minister of Education, Culture, Sports, Science and Technology (MEXT),High Energy Accelerator Research Organization (KEK) andJapan Atomic Energy Agency (JAEA) set up the External
Experts Panel on June 18. Six experts from a wide range offields were appointed as members to be asked to review
the radioactive material leak at the Hadron Experimental Facility, and to recheck items such as J-PARC’s safety
management system and procedures to be followed incase of emergency. The meetings were held six times from
June to August, then on August 27, the Chairperson of the
Panel hand-delivered the inquiry report to the Director
General of KEK and the Executive Director of JAEA.

1st External Experts Panel Meeting in Tokai Village

J-PARC Annual Report 2013

Events83

T2K Experiment Reveals Clear Indicationsof the Existence of the “Electron Neutron
Appearance Phenomenon” (July 19)
At a meeting of the European Physical Society
held in Stockholm, the International T2K Collaboration
announced on July 19, for the first time in the world, thedefinite existence of the “Electron Neutrino Appearance
Phenomenon” in which a muon neutrino transforms
during flight into an electron neutrino. To announce
this development, a press conference was held inTokai Village by KEK, Institute for Cosmic Ray, University of Tokyo and J-PARC Center. This achievement was
selected as one of the “top 100 science stories in 2013”by the Discover Magazine.

Electron Neutrino Event (Dec.19, 2010)

Submission of Third Incident Report (August 12)
Following the first report on May 31 and the second
report on June 18, in accordance with Prevention ofRadiation Health Impairment Due to Radioisotope, etc.
and its enforcement ordinance, KEK and JAEA submitted
the third report to the Nuclear Regulation Authority on

August 12. On the same day, the third “incident report” on
the same incident was also submitted to Ibaraki Prefecture, Tokai Village, and other relevant local governments
based on the agreement on safety and environmental
protection near nuclear facilities.

Submission of Report on Improvement Measures for the J-PARC Incident to MEXT
(September 26)
Based on the developed improvement measuresand other steps to prevent incident recurrence, which
had been reviewed by the External Experts Panel, KEK

Safety Division

Radiation Safety Section
General Safety Section

Accelerator Division

Neutron Source Section

Deputy Director(Safety)

Neutron Science Section

Materials & Life Science
Division

Director

Accelerator Sections I - VII

Neutron Instrumentation Section
Muon Science Section

Deputy Director(JAEA)

Technology Development Section

Particle & Nuclear Physics
Division

Deputy Director(KEK)

Neutrino Section
Hadron Section
Transmutation Section
Cryogenics Section

Directoe's Oﬃce

Operations Support Section

Advisors &Internationalization

Information System Section
Public Relations Section

Administration
Division

General Aﬀairs Section
Users Aﬀairs Section
Users Oﬃce

J-PARC Center Organizational Chart as of October 1, 2013

and JAEA submitted a report on measures to be taken
to MEXT.

Reorganized J-PARC Center to reinforce
safety (October 1)
KEK and JAEA examined and reviewed the safety
management system, and on October 1, implemented
a reorganization of J-PARC. For the new organization,
independency of the Safety Division was enforced, anda new Deputy Director position was created. In addition,
two sections, the Neutrino and the Hadron Sections,have been newly established under the Particle andNuclear Physics Division.

Events

J-PARC Annual Report 201384

Held Explanatory Meetings for Residents on Efforts after the J-PARC Incident(October 31 – November 2)
Three explanatory meetings for residents were heldin Tokai Village to present the efforts, including the resultsof the investigation of the gold target of the J-PARC
Center made after the radioactive material leak incident
at the Hadron Experimental Facility. The meetings wereattended by a total of 85 people. After the presentation,
the executives of the Center were able to respond to manyquestions from the participants, and hear their valuablecomments.

The meetings in Tokai Village on November 2

Japan-Australia Neutron Science Workshop: “Sharing Science with Neutrons”(November 5-6)

The attendees of the Japan-Australia bilateral Neutron Science
Workshop

The Japan-Australian bilateral Neutron Science Workshop “Sharing Science with Neutrons” was organizedby the Australian Academy of Science (AAS) and theAustralian Nuclear Science and Technology Organization(ANSTO), and was held with the cooperation of J-PARC at
ANSTO’s OPAL reactor facility in the suburbs of Sidney. In
the workshop, there were reports of the latest information
regarding the facilities and equipment of both countries,
as well as talks and exchanges of views on state-of-the-art
research results in each specialized field. Many researchers
participated there from Australian side, and 17 participantsfrom Japanese institutes including J-PARC, JAEA, KEK and
CROSS (Comprehensive Research Organization for Scienceand Society), took part in the event.

SAT Technology Showcase 2014 in
Tsukuba (January 24)
To enhance exchanges among researchers, Science
Academy of Tsukuba (SAT) organized SAT Technology
Showcase 2014 at Tsukuba International Congress Center. A total of 118 posters were presented there. In theindexing presentation, four presentations from J-PARC
were featured. The corporate exhibition showcased facilities, research contents and topics of J-PARC using
models, panels and publicity pictures.

J-PARC at the SAT Technology Showcase

J-PARC Annual Report 2013

Events85

Studies to Confirm Performance of the Linac and 3 GeV Synchrotron (Mid-December
2013 to Mid-February 2014)
During the period when J-PARC operation was halted,
the accelerator team installed new ACS (Annular Coupled
Structure) accelerating cavities to raise the beam energy
to the design value of 400 MeV. Performance study using
a proton beam began on December 16, 2013. In midJanuary, the acceleration of a beam with current of 5 mA
was verified, and thereafter acceleration studies wereconducted with an increased beam current. From the endof January, performance testing was conducted at the 3
GeV synchrotron. At the test, the capability to accelerate
the injected proton beam from 400 MeV to 3 GeV andthat to extract the accelerated beam to the Materials andLife Science Experimental Facilty (MLF) were confirmed.

ACS accelerating cavities

Operation for user programs resumed at
MLF (February 17)
Since the radioactive material leak incident occurredat the Hadron Experimental Facility in May, 2013, the
J-PARC Center reconstructed the safety management
system and promoted measures against recurrence ofsimilar incidents. Those actions were reviewed extensively by the External Expert Panel and the walk-throughsurveys were completed by the authorities of Ibaraki
Prefecture and the regional municipalities by the end of
2013. MLF was confirmed to be safe for beam operationand the user programs were resumed on February 17.
Executive Directors of KEK and JAEA gave instructions for safe
operation (MLF control room)

Third International School for Strangeness Nuclear Physics 2014 (February 13-19)
The International School for Strangeness Nuclear
Physics 2014 was held by the JAEA and other organizations for students and young researchers from both insideand outside of Japan. The first half was held at J-PARC,
and the second half was held at Tohoku University. There
were about 50 participants. At the opening session,
Yujiro Ikeda, Director of the J-PARC Center, provided abasic overview of J-PARC. In a tour of the J-PARC facilities, the participants visited the MLF, the Central Control
Room and the Neutrino Experimental Facility.

Participants and staff of the School

Events

J-PARC Annual Report 201386

Collaborative Symposium of Elements Strategy Initiative and Large ResearchInstitutions 2014 (February 28-March 1)
In 2012, MEXT launched the Elements Strategy
Initiative for promoting research in the four domainsof magnetic materials, catalyst/battery materials, electronic materials, and structural materials. This is to beachieved by forming research centers, using four large
research facilities in Japan, including J-PARC. A meeting
bringing together key persons was held at the Kashiwa
Campus of the University of Tokyo, and over 200 participants attended. From J-PARC, Masatoshi Arai, Head of theMaterials and Life Science Division presented how J-PARC
reviewed and strengthened the facility safety systembefore the neutron and muon experiments resumed on
February 17, and introduced the researches at MLF.

Symposium at the University of Tokyo, Kashiwa

5th MLF Symposium 2014
(March 18-19)
The 5th MLF Symposium was held at the Tsukuba International Congreaa Center. The symposium was held jointlywith the 2nd Science Festa of Institute of Materials Structure
Science of KEK and the 31st PF Symposium. In total, about
300 posters and 50 talks were presented, and approximately 450 researchers participated.

Symposium at the Tsukuba International Congress Center

J-PARC Annual Report 2013

Events87

Visitors (2013)

Venkatarama Venugopal, Vice-president of the Indian Nuclear Society (September 4)

Heri Widyawati, State Ministry of Research and Technology, Indonesia (December 16)

Fan, Mingwu, Professor, Huazhong University of Science &Technology (October 21)

Ai Aoki, member of the House of Representatives (February 7)

Nigel Rhodes, Detector Group Leader, ISIS, Ratherford Appleton Laboratory (October 24)

Akihisa Nagashima, member of the House of Representatives(February 10)

Events

J-PARC Annual Report 2013

88

Akimasa Ishikawa, member of the House of Representatives, Ryousuke
Kouzuki, member of the House of Councillors, and others (February 17)

There were 2,154 visitors to J-PARC for the period from April, 2013, to the end of March, 2014.
In FY2013, the number of visitors decreased 45% compared to the previous fiscal year since we had to stop receiving
visitors due to the Hadron Incident.

Public Officers

ln-house
5%9%Foreigners
18%
VIP, lawmakers

Junior-high/High school
students, teachers
12%3%
Business
16%

16%
University students,
experts

Local residents
Media 1%20%

Publications

Publications

J-PARC Annual Report 201390

Publications in Periodical Journals
A-001
Diwan, M. et al.
Future Long-Baseline Neutrino Facilities andDetectors
Adv. High Energy Phys. Vol. 2013, 460123
A-002
Feldman, G. J. et al.
Long-Baseline Neutrino Oscillation
Experiments
Adv. High Energy Phys. Vol. 2013, 475749
A-003
Bernabeu, J. et al.
Neutrino Physics
Adv. High Energy Phys. Vol. 2013, 943471
A-004
Mihara, S. et al.
Charged Lepton Flavor-Violation
Experiments
Annu. Rev. Nucl. Part. Sci. Vol. 63, p. 531
A-005
Bhang, H. et al.
Three-Body ΛNN→ nNN Nonmesonic Weak
Decay Process of Λ Hypernuclei
Few-Body Syst. Vol. 54, p. 103
A-006
Naruki, M. et al.
Search for Pentaquark Θ+ in Hadronic
Reaction at J-PARC
Few-Body Syst. Vol. 54, p. 955
A-007
Ichikawa, Y. et al.
J-PARC E27 Experiment to Search for a
Nuclear Kaon Bound State K−pp
Few-Body Syst. Vol. 54, p. 1191
A-008
Ajimura, S. et al.
A Search for Deeply Bound Kaonic Nuclear
States at J-PARC
Few-Body Syst. Vol. 54, p. 1195
A-009
Sugimura, H. et al.
Study of Neutron-Rich Hypernuclei by the(π-, K+) Reaction at J-PARC
Few-Body Syst. Vol. 54, p. 1235
A-010
Bhang, H. et al.
The Strong Three-body Weak Interaction
Contribution in the Nonmesonic Weak Decayof p-shell Λ Hypernuclei
Few-Body Syst. Vol. 54, p. 1239
A-011
Miyake, Y. et al.
Ultra slow muon microscopy by laser
resonant ionization at J-PARC, MUSE

Hyper ne Interact. Vol. 216, p. 79
A-012
Sugano, M. et al.
Cryogenic Design of a Superconducting
Solenoid for Muonium Hyperfine Structure
Measurement
IEEE Trans. Appl. Supercond. Vol. 23, 3800204
A-013
Ogitsu, T. et al.
Status of Superconducting Magnet System
for J-PARC Neutrino Beam LineIEEE Trans. Appl. Supercond. Vol. 23, 4001506
A-014
Yoshida, M. et al.
Development of a Radiation ResistantSuperconducting Solenoid Magnet for mu-e
Conversion Experiments
IEEE Trans. Appl. Supercond. Vol. 23, 4101404
A-015
Sasaki, K. et al.
Superconducting Magnet Design for theHyperfine Structure Measurement of
Muonium at the J-PARC
IEEE Trans. Appl. Supercond. Vol. 23, 4500704

A-021
Saha, P. K. et al.
Quantitative monitoring of the stripper
foil degradation in the 3-GeV rapid cycling
synchrotron of the Japan proton accelerator
research complex
J. Radioanal. Nucl. Chem. Vol. 299, p. 1041
A-022
Abgrall, N. et al.
Pion emission from the T2K replica target:
Method, results and application
Nucl. Instrum. Methods Phys. Res. A Vol. 701,
p. 99
A-023
Morita, Y. et al.
Numerical analysis and experiment to
identify origin of buckling in rapid cycling
synchrotron core
Nucl. Instrum. Methods Phys. Res. A Vol. 728,
p. 23
A-024
Maruta, T. et al.
Longitudinal beam halo measurement withan RF chopper system
Nucl. Instrum. Methods Phys. Res. A Vol. 728,
p. 126

A-016
Ge, S. F. et al.
Determination of mass hierarchy withmedium baseline reactor neutrino
experiments
J. High Energy Phys. 05(2013)131

A-025
Koseki, K.
The fast extraction kicker power supply forthe main ring of J-PARC
Nucl. Instrum. Methods Phys. Res. A Vol. 729, p. 3

A-017
Hagiwara, K. et al.
Physics potential of neutrino oscillation
experiment with a far detector in Oki Island
along the T2K baseline
J. High Energy Phys. 06(2013)036

A-026
Komatsu, Y. et al.
Development of the GEM tracker for the
J-PARC E16 experiment
Nucl. Instrum. Methods Phys. Res. A Vol. 732,
p. 241

A-018
Maruta, T. et al.
Progress of beam commissioning and beamloss mitigation in the J-PARC linac after the
Tohoku earthquake
J. Korean Phys. Soc. Vol. 63, p. 1274

A-027
Ieiri, M. et al.
Electrostatic separators in the hadronexperimental facility at J-PARC
Nucl. Instrum. Methods Phys. Res. B Vol. 317,
p. 338A-019
Makimura, S. et al.
Remote-controlled non-destructive
measurement for thermal conductivity ofhighly radioactive isotropic graphite used as
the muon production target at J-PARC/MUSE
J. Nucl. Mater. Vol. 2013, p. 000

A-028
Strasser, P. et al.
Superconducting curved transport solenoidwith dipole coils for charge selection of themuon beam
Nucl. Instrum. Methods Phys. Res. B Vol. 317,
p. 361

A-020
Sato, T. et al.
Particle and Heavy Ion Transport code
System, PHITS, version 2.52
J. Nucl. Sci. Technol. Vol. 50, p. 913

A-029
Ikedo, Y. et al.
Positron separators in Superomega muon
beamline at J-PARC
Nucl. Instrum. Methods Phys. Res. B Vol. 317,
p. 365J-PARC Annual Report 2013

Publications

91
A-030
Tanaka, K.
High intensity beam handling for nuclear
and particle physics
Nucl. Instrum. Methods Phys. Res. B Vol. 317,
p. 381
A-031
Moritsu, M. et al.
Search for the Θ+ pentaquark at J-PARC
Nucl. Phys. A Vol. 914, p. 91
A-032
Ajimura, S. et al.
A search for deeply-bound kaonic nuclear
state at the J-PARC E15 experiment
Nucl. Phys. A Vol. 914, p. 315
A-033
Takahashi, T.
Overview of hypernuclear physics programat K1.8 and K1.1 beam lines of J-PARC
Nucl. Phys. A Vol. 914, p. 530
A-034
Takahashi, H.
S = -3 physics at J-PARC
Nucl. Phys. A Vol. 914, p. 553
A-035
Hino, M. et al.
Current status of BL06 beam line for VIN
ROSE at J-PARC/MLF
Phys. Procedia Vol. 42, p. 136
A-036
Li, Q. et al.
Magnetic field design of combined-function
magnets wound with coated conductors
Phys. Procedia Vol. 45, p. 237
A-037
Abe, K. et al.
T2K neutrino flux prediction
Phys. Rev. D Vol. 87, 012001
A-038
Abe, K. et al.
Measurement of the inclusive νμ charged
current cross section on carbon in the neardetector of the T2K experimentPhys. Rev. D Vol. 87, 092003
A-039
Abe, K. et al.
Evidence of electron neutrino appearance ina muon neutrino beam
Phys. Rev. D Vol. 88, 032002
A-040
Abe, K. et al.
Measurement of Neutrino Oscillation
Parameters from Muon Neutrino
Disappearance with an Off-Axis Beam
Phys. Rev. Lett. Vol. 111, 211803

A-041
Kondo, Y. et al.
High-power test and thermal characteristics
of a new radio-frequency quadrupole cavity
for the Japan Proton Accelerator ResearchComplex linac
Phys. Rev. STAB Vol. 16, 040102
A-042
Tamura, F. et al.
Multiharmonic rf feedforward system forcompensation of beam loading and periodictransient effects in magnetic-alloy cavities ofa proton synchrotron
Phys. Rev. STAB Vol. 16, 051002
A-043
Ohmori, C. et al.
Development of a high gradient rf systemusing a nanocrystalline soft magnetic alloy
Phys. Rev. STAB Vol. 16, 112002
A-044
Saha, P. K. et al.
Beam emittance control by changing
injection painting area in a pulse-to-pulse
mode in the 3-GeV rapid cycling synchrotronof Japan Proton Accelerator ResearchComplex
Phys. Rev. STAB Vol. 16, 120102
A-045
Mitamura, K. et al.
Novel neutron reflectometer SOFIA at
J-PARC/MLF for in-situ soft-interface
characterization
Polym. J. Vol. 45, p. 100
A-046
Yamagata-Sekihara, J. et al.
Production of hyperon resonances inducedby kaons on a deuteron target
Prog. Theor. Exp. Phys. 2013, 043D02
A-047
Autsavapromporn, N. et al.
Gap Junction Communication and the
Propagation of Bystander Effects Induced byMicrobeam Irradiation in Human Fibroblast
Cultures: The Impact of Radiation Quality
Radiat. Res. Vol. 180, p. 367
A-048
Jin, X. et al.
Development of a cryogenic load frame
for the neutron diffractometer at Takumi inJapan Proton Accelerator Research Complex
Rev. Sci. Instrum. Vol. 84, 063106
A-049
Inutsuka, M. et al.
High Density Polymer Brush Spontaneously
Formed by the Segregation of Amphiphilic
Diblock Copolymers to the Polymer/Water
InterfaceACS Macro Letters. Vol 2, 265-268 (2013)

A-050
Ogata, Y. et al.
Multistep Thickening of Nafion Thin Films in
Water
ACS Macro Letters. Vol 2, 856-859 (2013)
A-051
Gong, W. et al.
Effects of ausforming temperature on bainite
transformation, microstructure and variant
selection in nanobainite steel
Acta Mater., Vol 61, 4142-4154 (2013)
A-052
Shatskiy, A. et al.
Melting and subsolidus phase relations inthe system Na2CO3-MgCO3±H2O at 6 GPaand the stability of Na2Mg(CO3)2 in the upper
mantleAm. Mineral., Vol 98, 2172-2182 (2013)
A-053
Shatskiy, A. et al.
The system K2CO3-MgCO3 at 6 GPa and
900–1450 °C
Am. Mineral., Vol 98, 1593-1603 (2013)
A-054
Ito, T. U. et al.
Shallow donor level associated withhydrogen impurities in undoped BaTiO3Appl. Phys. Lett., Vol 103, - (2013)
A-055
Kofu, M. et al.
Magnetic relaxations in a Tb-based single
molecule magnet studied by quasielastic
neutron scattering
Chem. Phys., Vol 427, 147-152 (2013)
A-056
Ghosh, S. et al.
Effect of water in depleted mantle on postspinel transition and implication for 660 km
seismic discontinuity
Earth Planet. Sc. Lett., Vol 371–372, 103-111(2013)
A-057
Tsujino, N. et al.
Equation of state of γ-Fe: Reference density
for planetary cores
Earth Planet. Sc. Lett., Vol 375, 244-253 (2013)
A-058
Naoe, T. et al.
Optically observation of mercury cavitation
bubble collapsing
Exp. Therm. Fluid Sci., Vol 44, 550-555 (2013)
A-059
Hoshikawa, A. et al.
Development of Automatic Sample
Exchange and Transfer System in iMATERTA/i MATERIAにおける自動試料交換搬送機構の開発
Hamon/波紋. Vol 23, 204-209 (2013)Society
JournalPublications

J-PARC Annual Report 2013

92
A-060
Parker, J. D. et al.
Development of a Time-resolved Neutron
Imaging Detector Based on the μPIC MicroPixel Chamber/ μPIC (Micro-Pixel Chamber)the Magnetic States of Delafossite CuCrO2
Having a Spin-3/2 Antiferromagnetic Triangular SublatticeInt. J. Mod. Phys. B., Vol 27, (2013)を用いた中性子イメージング検出器の開発

A-070
Kamiyama, T. et al.
Application of Pulsed Neutron for Battery
Research/パルス中性子で何ができるか : 蓄電池
Ionizing radiation/放射線. Vol 39, 65-70 (2013)
Society Journal

Hamon/波紋. Vol 23, 218-222 (2013)
A-061
Tanaka, I. et al.
Biomacromolecular Neutron Crystallography Sample Preparation, Diffractometers,
Measurements and Data Reduction for
Neutron Protein Crystallography
Hamon/波紋. Vol 23, 288-293 (2013)Society
JournalA-062
Yokoyama, T. et al.
Hydrogen-bond Network and pH Sensitivity
in Transthyretin/トランスサイレチンにおける水素結合ネットワークとpH感受性
Hamon/波紋. Vol 23, 142-145 (2013)Society
Journal
A-063
Komatsu, K. et al.
Development of a new P–T controllingsystem for neutron-scattering experiments
High Pressure Research. Vol 33, 208-213 (2013)
A-064
Okuchi, T. et al.
Pulsed neutron powder diffraction at highpressure by a capacity-increased sapphireanvil cellHigh Pressure Research. Vol 33, 777-786 (2013)
A-065
Park, S. W. et al.
Magnetic Structure and Electromagnetic
Properties of LnCrAsO with a ZrCuSiAs-type
Structure (Ln = La, Ce, Pr, and Nd)
Inorg. Chem., Vol 52, 13363-13368 (2013)
A-066
Wang, H. et al.
On the Structure of α-BiFeO3
Inorg. Chem., Vol 52, 2388-2392 (2013)
A-067
Yabuuchi, N. et al.
A Comparative Study of LiCoO2 Polymorphs:
Structural and Electrochemical Characterization of O2-, O3-, and O4-type Phases
Inorg. Chem., Vol 52, 9131-9142 (2013)
A-068
Wan, T. et al.
Pitting damage imaging by non-linear ultrasonic technique: comparison between resonance and non-resonance modes
Int. J. Mater. Prod Tec., Vol 46, 141-154 (2013)
A-069
Okuda, T. et al.
Effects of Hole-Doping and Disorder on

A-071
Naito, D. et al.
In Situ Neutron Diffraction during TensionCompression Deformation for Nodular
Graphite Cast Irons
ISIJ Int., Vol 53, 1292-1294 (2013)
A-072
Wang, R. et al.
Phase relationship of the TbO1.81–Mn3O4–
Fe2O3 system synthesized at 1200°C
J. Alloy. Compd., Vol 554, 385-394 (2013)
A-073
Chuajiw, W. et al.
Effects of amine, amine salt and amide on
the behaviour of carbon dioxide absorption into calcium hydroxide suspension toprecipitate calcium carbonate
J. Environ. Sci., Vol 25, 2507-2515 (2013)
A-074
Litasov, K. D. et al.
Thermal equation of state and thermodynamic properties of iron carbide Fe3C to
31 GPa and 1473 K
J. Geophys. Res-Sol. Ea., Vol 118, 2013JB010270(2013)
A-075
Kubota, S. et al.
Effect of Microstructure on Mechanical
Properties and Machinability of Spheroidal
Graphite Cast Iron/球状黒鉛鋳鉄の機械的性質と切削性に及ぼすミクロ組織の影響

J. JFS/鋳造工学Vol 85, 489-496 (2013)
A-076
Wan, T. et al.
A Novel Ultrasonic Evaluation Process for
Cavitation Damage by Combination of
Attenuation and Higher Harmonics
J. JSEM/実験力学, Vol 13, 387-394 (2013)
A-077
Yano, S. et al.
Magnetic excitations in ferromagnetic phaseof MnPJ. Magn. Magn. Mater., Vol 347, 33-38 (2013)
A-078
Hirose, K. et al.
Cross-section measurement of 237Np (n, γ)from 10 meV to 1 keV at Japan Proton Accelerator Research Complex

J. Nucl. Sci. Technol., Vol 50, 188-200 (2013)
A-079
Kinoshita, H. et al.
Experimental study on heat transfer andpressure drop in mercury flow system for
spallation neutron source
J. Nucl. Sci. Technol., Vol 50, 400-408 (2013)
A-080
Sanghyun, L. et al.
Large in-plane deformation of RuO6 octahedron and ferromagnetism of bulk SrRuO3
J.Phys-Condens Mat., Vol 25, 465601 (2013)
A-081
Arai, H. et al.
Expectation of Analysis Using BL09/SPICA,
the World’s First Neutron Beamline Dedicated for Battery Analysis/世界初の蓄電池専用
中性子ビームラインBL09/SPICAを用いた解析への期待 (超の世界)
J. Soc. Automotive Engineers of Japan/自動車技
術. Vol 67, 108-109 (2013)
A-082
Yokoyama, T. et al.
Hydrogen-bond network and pH sensitivity
in human transthyretin
J. Synchrotron Radiat. Vol 20, 834-7 (2013)
A-083
Kusaka, K. et al.
Evaluation of performance for IBARAKI
biological crystal diffractometer iBIX withnew detectors
J. Synchrotron Radiat., Vol 20, 994-998 (2013)
A-084
Hagiwara, T. et al.
Relationship between crystal structure andoxide-ionconduction in Ln2Zr2O7 (Ln=Eu,
Nd and La) system deduced by neutron and
X-ray diffraction
J. Ceram Soc. Jpn. Vol 121, 205-210 (2013)
A-085
Tomota, Y. et al.
Deformation Behavior of Ferrous Materials
Studied by Using Neutron Diffraction/中性子回折を用いた鉄系材料の変形特性の解析

Journal of the JSTP/塑性と加工., Vol 54, 891-895(2013)Society Journal
A-086
Kobayashi, Y. et al.
In-plane anisotropy of the magnetic and theelectric properties of the Fe pnictide
Ba(Fe1−xCox)2As2
J.Korean Phys. Soc., Vol 63, 481-485 (2013)
A-087
Kobayashi, Y. et al.
Phase separation of antiferromagnetism andsuperconductivity in RbxFe2−ySe2 observedby using Rb NMR
J. Korean Phys. Soc., Vol 63, 448-452 (2013)

J-PARC Annual Report 2013

Publications

93
A-088
Ohishi, K. et al.
Magnetism and superconductivity in
RbxFe2−ySe2
J. Korean Phys. Soc. Vol 62, 1994-1996 (2013)
A-089
Sato, M. et al.
On the superconducting symmetry of
Fe-based systems — Impurity effect studies
and neutron scattering measurements
J. Korean Phys. Soc. Vol 62, 1726-1733 (2013)
A-090
Asai, S. et al.
Spin State of Co3+ in LaCo1-xRhxO3 Investigated by Structural Phenomena
J. Phys. Soc. Jpn.,Vol 82, 114606 (2013)
A-091
Fujita, M. et al.
Temperature Dependence of Spin Excitations in the Frustrated Spin Chain System
CuGeO3
J. Phys. Soc. Jpn.,Vol 82, 084708 (2013)
A-092
Itoh, S. et al.
Neutron Brillouin Scattering with Pulsed
Spallation Neutron Source – Spin-Wave
Excitations from Ferromagnetic Powder
Samples –J. Phys. Soc. Jpn.,Vol 82, 043001 (2013)
A-093
Iwasa, K. et al.
Well-Defined Crystal Field Splitting Schemes
and Non-Kramers Doublet Ground States of f
Electrons in PrT2Zn20 (T= Ir, Rh, and Ru)
J. Phys. Soc. Jpn.,Vol 82, 043707 (2013)
A-094
Kajimoto, R. et al.
Effects of Mg, Ag, and Al Substitutions on
Magnetic Excitations in the Triangular-Lattice
Antiferromagnet CuCrO2
J. Phys. Soc. Jpn.,Vol 82, 054702 (2013)
A-095
Kobayashi, Y. et al.
75As NQR and NMR Studies on the Superconducting State of Ca10Pt4As8(Fe1−xPtxAs)10
J. Phys. Soc. Jpn.,Vol 83, 014712 (2013)
A-096
Kodama, K. et al.
Local Lattice Distortion Caused by Short
Range Charge Ordering in LiMn2O4
J. Phys. Soc. Jpn.,Vol 82, 094601 (2013)
A-097
Ogiwara, N.
Monte Carlo Simulation of Gas-sheet Targets
Generated by Narrow Slits
J. Vac. Soc. Jpn. Vol 56, 146-150 (2013)

A-098
Sukenobu, S. et al.
Calculation of Transmission Probability ofFormed Bellows Tubes using Monte-Carlo
MethodJ. Vac. Soc. Jpn. Vol 56, 142-145 (2013)

A-108
Suzuki, H. et al.
Neutron diffraction studies on strain-dependence of superconducting properties inpractical superconducting composite
Neutron News. Vol 24, 18-21 (2013)

A-099
Oigawa, H. et al.
Progress review of research and development on accelerator driven system in JAEAKURRI-KR(CD). Vol 40, 16-30 (2013)

A-109
Segawa, M. et al.
Development of a high-speed camera
system for neutron imaging at a pulsed
neutron source
Nucl. Instrum. Meth. A, Vol 697, 77-83 (2013)

A-100
Xia, T. et al.
Dewetting Process of Deuterated Polystyrene and Poly(vinyl methyl ether) Blend Thin
Films via Phase Separation
Macromolecules. Vol 46, 4540-4547 (2013)
A-101
Yoshiie, T. et al.
Pitting Damage in Metals by Mercury Cavitation with MIMTM/MIMTMを用いた水銀キャビ
テーションによる金属の壊食損傷構造

Materia Japan/まてりあ, Vol 52, 390-394 (2013)
Society Journal
A-102
Otomo, T. et al.
Studies of Hydrogen Storage Mechanismwith High Intensity Neutron Total Scattering/
高強度中性子を用いた全散乱法による水素貯蔵機
構の解明
Materia Japan/まてりあ, Vol 52, 346-349 (2013)

Society Journal
A-103
Aizawa, K. et al.
In-Situ Neutron Diffraction Study on Tensile
Behavior of LPSO Mg-Zn-Y Alloys
MATER. TRANS., Vol 54, 1083-1086 (2013)
A-104
Gong, W. et al.
Neutron Diffraction on LPSO Structure in
Mg-Zn-Y Alloys
MATER. TRANS., Vol 54, 974-976 (2013)
A-105
Kojima, K.
PSI流µSRデータ解析ツール“musrfit”
Meson/日本中間子科学会 めそん. Vol 38, 37-43(2013)Society Journal
A-106
Anzai, H. et al.
Relation between the nodal and antinodal
gap and critical temperature in superconducting Bi2212
Nat Commun. Vol 4, 1815 (2013)
A-107
Sakamaki, T. et al.
Ponded melt at the boundary between thelithosphere and asthenosphere
Nature Geosci. Vol 6, 1041-1044 (2013)

A-110
Suzuki, H. et al.
Effects of gauge volume on pseudo-strain
induced in strain measurement using timeof-flight neutron diffraction
Nucl. Instrum. Meth. A, Vol 715, 28-38 (2013)
A-111
Kajimoto, R. et al.
Contamination from the next higher incident energy in inelastic neutron scattering
measurements with multiple incident energies on chopper spectrometers
Nucl. Instrum. Meth. A, Vol 729, 365-370 (2013)
A-112
Parker, J. D. et al.
Spatial resolution of a μPIC-based neutron
imaging detector
Nucl. Instrum. Meth. A, Vol 726, 155-161 (2013)
A-113
Parker, J. D. et al.
Neutron imaging detector based on the
micro-pixel chamber
Nucl. Instrum. Meth. A, Vol 697, 23-31 (2013)
A-114
Shobuda, Y. et al.
Measurement scheme of kicker impedances
via beam-induced voltages of coaxial cables
Nucl. Instrum. Meth. A, Vol 713, 52-70 (2013)
A-115
Toh, K. et al.
Development of two-dimensional multiwire-type neutron detector system withindividual line readout and optical signaltransmission
Nucl. Instrum. Meth. A, Vol 726, 169-174 (2013)
A-116
Tomoyori, K. et al.
Profile functions to reproduce Bragg reflection shapes observed by a time-of-flightsingle-crystal diffractometer installed at a
coupled moderator pulsed neutron sourcein J-PARC
Nucl. Instrum. Meth. A, Vol 723, 128-135 (2013)
A-117
Kamiyama, T. et al.
J-PARC MLF BL08: 粉末中性子回折装置

Publications

J-PARC Annual Report 201394
PF News. Vol 30, 35 (2013)Society Journal
A-118
Takai, S. et al.
Defect Structure and Oxide-Ion Conduction Properties of Pb-Substituted
La2Mo2O9/Pbを添加したLa2Mo2O9の欠陥構造と酸化物イオン伝導特性

PF News. Vol 31, 27-30 (2013)
A-119
Kusano, T. et al.
Structural Study of Organic Salts Effect on
the Trimeric Surfactant Aggregates
Photon Factory News. Vol 31, 9-13 (2013)
A-120
Hoshino, N. et al.
Three-way Switching in a Cyanide-dridged[Fe-Co] Chain
Photon Factory News. Vol 31, 12-16 (2013)
A-121
Martin, M. et al.
Muon-spin relaxation study on Li- andNa-diffusion in solids
Physica Scripta. Vol 88, 068509 (2013)
A-122
Hanna, T. et al.
From antiferromagnetic insulator to
ferromagnetic metal: Effects of hydrogen
substitution in LaMnAsO
Phys. Rev. B, Vol 87, 020401 (2013)
A-123
Hiroi, M. et al.
Muon spin relaxation study of spinglass freezing in the Heusler compound
Ru1.9Fe0.1CrSi
Phys. Rev. B, Vol 88, 024409 (2013)
A-124
Iimura, S. et al.
Switching of intra-orbital spin excitations
in electron-doped iron pnictide superconductors
Phys. Rev. B, Vol 88, 060501 (2013)
A-125
Kofu, M. et al.
Hyperfine structure of magnetic excitations in a Tb-based single-moleculemagnet studied by high-resolution
neutron spectroscopy
Phys. Rev. B, Vol 88, 064405 (2013)
A-126
Mahyari, Z. L. et al.
Universal inhomogeneous magnetic-field
response in the normal state of cupratehigh-Tc superconductors
Phys. Rev. B, Vol 88, 144504 (2013)
A-127
Matsuda, K. et al.
Electron momentum density in liquidsiliconPhys. Rev. B, Vol 88, 115125 (2013)

rene matrices
Polym J. Vol 45, 117-123 (2013)

A-128
Sanna, S. et al.
Onset of magnetism in optimally electrondoped L Fe1−xRuxAsO1−yFy (L=La, Nd, or Sm)
superconductors around x =1/4
Phys. Rev. B, Vol 87, 134518 (2013)

A-137
Mitamura, K. et al.
Novel neutron reflectometer SOFIA at
J-PARC/MLF for in-situ soft-interface characterization
Polym J. Vol 45, 100-108 (2013)

A-129
Kikuchi, T. et al.
Mode-distribution analysis of quasielastic
neutron scattering and application toliquid waterPhys. Rev. E, Vol 87, 062314 (2013)

A-138
Hasegawa, S. et al.
Crystal morphology-dependent graftpolymerization in poly(ether ether ketone)
films
Polymer. Vol 54, 2895-2900 (2013)

A-130
Medarde, M. et al.
1D to 2D Na+ Ion Diffusion Inherently
Linked to Structural Transitions in
Na0.7CoO2
Phys. Rev. Lett, Vol 110, 266401 (2013)

A-139
Chuajiw, W. et al.
Polymerization properties of polyamide inbottom-up prepared polyamide-calcium
carbonate composites
Polymer Composites, n/a-n/a (2013)

A-131
Kondo, Y. et al.
High-power test and thermal characteristics of a new radio-frequency quadrupole
cavity for the Japan Proton Accelerator
Research Complex linac
Phys. Rev. Spec. Top - Ac., Vol 16, 040102(2013)

A-140
Zhu, J. et al.
Nuclear and charge density distributions
in ferroelectric PbTiO3: maximum entropy
method analysis of neutron and X-ray
diffraction data
Powder Diffraction. Vol 28, 276-280 (2013)

A-132
Saha, P. K. et al.
Beam emittance control by changing
injection painting area in a pulse-to-pulse
mode in the 3-GeV rapid cycling synchrotron of Japan Proton Accelerator ResearchComplex
Phys. Rev. Spec. Top - Ac., Vol 16, 120102 (2013)
A-133
Takahashi, S. et al.
Phase relations in the carbon-saturated C–
Mg–Fe–Si–O system and C and Si solubility
in liquid Fe at high pressure and temperature: implications for planetary interiors
Phys Chem Minerals. Vol 40, 647-657 (2013)

A-141
Jin, X. et al.
Development of a cryogenic load frame
for the neutron diffractometer at Takumi
in Japan Proton Accelerator ResearchComplex
Review of Scientific Instruments. Vol 84,
063106-063106-4 (2013)
A-142
Mukai, K. et al.
The gradient distribution of Ni ions incation-disordered Li[Ni1/2Mn3/2]O4 clarified by muon-spin rotation and relaxation(µSR)
RSC Advances. Vol 3, 11634-11639 (2013)

A-134
Litasov, K. D. et al.
P–V–T equation of state of siderite to
33 GPa and 1673 K
Phys. Earth Planet. In., Vol 224, 83-87 (2013)

A-143
Ogo, S. et al.
A Functional [NiFe]Hydrogenase Mimic
That Catalyzes Electron and Hydride
Transfer from H2
Science. Vol 339, 682-684 (2013)

A-135
Noda, Y. et al.
Polarization Analysis Equipment in SANS-JII: Study of Polymer Electrolyte Membrane
for Fuel Cell
Physics Procedia. Vol 42, 46-51 (2013)

A-144
Takai, S. et al.
Structural and electrical properties
of Pb-substituted La2Mo2O9 oxide ion
conductors,
Solid State Ionics. Vol 238, 36-43 (2013)

A-136
Arita, H. et al.
Chain-mixing behavior at interface
between polystyrene brushes and polysty-

A-145
Hemmi, T. et al.
Neutron diffraction measurement ofinternal strain in the first Japanese ITER CS

J-PARC Annual Report 2013

Publications

95
conductor sample
Superconductor Science and Technology. Vol
26, 084002 (2013)
A-146
Osamura, K. et al.
Thermal strain exerted on superconductive filaments in practical Nb3Sn and Nb3Al
strands
Superconductor Science and Technology. Vol
26, 094001 (2013)

A-147
Awaji, S.
Quantitative strain measurement in Nb3Sn
wire and cable conductors using highenergy x-ray and neutron beams
Superconductor Science and Technology. Vol
26, 073001 (2013)

Conference Reports and Books
C-001
Fujiwara, T. et al.
Inorganic scintillation detector
development for J-PARC spallation neutron
sourceIEEE Nucl. Sci. Sympo. Conf. Rec. Vol. 2013,06829479
C-002
Ueno, K. et al.
Fast Readout ASIC for Si-Strip Detector in
the J-PARC Muon g-2/EDM Experiment andOther Related Applications
IEEE Nucl. Sci. Sympo. Conf. Rec. Vol. 2013,06829771
C-003
Garoby, R. et al.
Proton drivers for neutrino beams andother high intensity applications
J. Phys. Conf. Ser. Vol. 408, 012016
C-004
Mihara, S.
Prospects for CLFV experiments
J. Phys. Conf. Ser. Vol. 408, 012017
C-005
Kawamura, N. et al.
The H line: a brand new beam line forfundamental physics at the J-PARC muon
facility
J. Phys. Conf. Ser. Vol. 408, 012072
C-006
Toyoda, A. et al.
J-PARC MUSE H-line optimization for theg-2 and MuHFS experiments
J. Phys. Conf. Ser. Vol. 408, 012073
C-007
Sasaki, K. I. et al.
Development status of superconducting
solenoid for the MuHFS experiment at the
J-PARCJ. Phys. Conf. Ser. Vol. 408, 012074

C-008
Yamazaki, Y. et al.
Analysis of Hybrid Type Boron-Doped
Carbon Stripper Foils in J-PARC RCS
J. Phys. Conf. Ser. Vol. 417, 012071
C-009
Yoshimoto, M. et al.
HBC Foil Beam Study and Long-term
Observation at the 3-GeV RCS in J-PARC
J. Phys. Conf. Ser. Vol. 417, 012073
C-010
Kobayashi, M.
Neutrino mass and mixing - The beginningand future Nucl. Phys. B(Proc. Suppl.) Vol. 235, p. 4
C-011
Nakadaira, T.
Super beam
Nucl. Phys. B(Proc. Suppl.) Vol. 235, p. 158
C-012
Nishikawa, K.
Experimental Prospect
Nucl. Phys. B(Proc. Suppl.) Vol. 235, p. 441
C-013
Meigo, S. et al.
DEVELOPMENT OF BEAM FLATTENINGSYSTEM USING NON-LINEAR BEAM OPTICS
AT J-PARC
Proceedings of AccApp2013, Bruges, Belgium
p. 211

MULTI-BUNCH BEAM
Proceedings of IPAC2013, Shanghai, China
p. 506
C-016
Saha, P. K. et al.
BEAM COMMISSIONING OF TWO
HORIZONTAL PULSE STEERING MAGNETSFOR CHANGING INJECTION PAINTING
AREA FROM MLF TO MR IN THE 3-GeV RCS
OF J-PARC
Proceedings of IPAC2013, Shanghai, China
p. 518C-017
Miura, A. et al.
BEAM MONITOR LAYOUT FOR FUTURE ACSSECTION IN J-PARC LINAC
Proceedings of IPAC2013, Shanghai, China
p. 529C-018
Miura, A. et al.
BUNCH LENGTH MEASUREMENT OF 181
MEV BEAM IN J-PARC LINAC
Proceedings of IPAC2013, Shanghai, China
p. 532
C-019
Takayanagi, T. et al.
POWER SUPPLY OF THE PULSE STEERINGMAGNET FOR CHANGING THE PAINTING
AREA BETWEEN THE MLF AND THE MR AT
J-PARC 3 GEV RCS
Proceedings of IPAC2013, Shanghai, China
p. 681

C-014
Zhang, W. et al.
HIGH CURRENT AND HIGH POWER FASTKICKER SYSTEM CONCEPTUAL DESIGNAND TECHNOLOGY OVERVIEW FOR DEEME
EXPERIMENT
Proceedings of IEEE PPC2013, aohsiung,Taiwan 06627450

C-020
Fukuoka, S. et al.
DEVELOPMENT OF A FAST COMPENSATIONKICKER SYSTEM FOR J-PARC MAIN-RING
INJECTION
Proceedings of IPAC2013, Shanghai, China
p. 684

C-015
Naito, T. et al.
BEAM OSCILLATION MONITOR FOR THE

C-021
Ohmori, C. et al.
RECENT PROGRESS ON THE DEVELOPMENTPublications

J-PARC Annual Report 201396
OF A HIGH GRADIENT RF SYSTEM USINGHIGH IMPEDANCE MAGNETIC ALLOY, FT3L
Proceedings of IPAC2013, Shanghai, China
p. 1152
C-022
Imajo, S. et al.
REBUNCHING ULTRACOLD NEUTRONSBY MAGNETIC DECELERATION FOR THE
NEUTRON EDM EXPERIMENTAL AT J-PARC
Proceedings of IPAC2013, Shanghai, China
p. 1187
C-023
Artikova, S. et al.
THE ACCELERATOR DESIGN OF MUON g-2
EXPERIMENT AT J-PARC
Proceedings of IPAC2013, Shanghai, China
p. 1334
C-024
Ohmi, K. et al.
SPACE CHARGE SIMULATION BASED ON
MEASURED OPTICS IN J-PARC MR
Proceedings of IPAC2013, Shanghai, China
p. 1589
C-025
Yamamoto, M. et al.
SIMULATION FOR CONTROL OFLONGITUDINAL BEAM EMITTANCE IN
J-PARC MR
Proceedings of IPAC2013, Shanghai, China
p. 1610C-026
Konstantinova, O. et al.
BUNCH BY BUNCH INTRA-BUNCHFEEDBACK SYSTEM FOR CURING
TRANSVERSE BEAM INSTABILITIES AT THE
J-PARC MR
Proceedings of IPAC2013, Shanghai, China
p. 1739
C-027
Maruta, T. et al.
BEAM DYNAMICS DESIGN OF 3 MEVMEDIUM ENERGY BEAM TRANSPORT FOR
BEAM INTENSITY UPGRADE OF J-PARC
LINAC
Proceedings of IPAC2013, Shanghai, China
p. 1916
C-028
Fun, K. et al.
POSSIBILITY STUDY OF HIGH REPETITIONRATE OPERATION OF JPARC MAIN RING
Proceedings of IPAC2013, Shanghai, China
p. 2528
C-029
Fun, K. et al.
UPGRADE STUDY OF J-PARC MAIN RING
FAST EXTRACTION SEPTA SYSTEM
Proceedings of IPAC2013, Shanghai, China
p. 2531

C-030
Molodozhentsev, A. et al.
FURTHER IMPROVEMENT OF THE PTCORBIT CODE TO MODEL REALISTICOPERATION OF HIGH-BEAM POWER
SYNCHROTRONS
Proceedings of IPAC2013, Shanghai, China
p. 2534

p. 3312

C-031
Yoshii, M. et al.
STATUS OF THE J-PARC MA LOADED RF
SYSTEMS
Proceedings of IPAC2013, Shanghai, China
p. 2537

C-040
Ikegami, M. et al.
COMMISSIONING PLAN FOR ENERGYUPGRADE OF J-PARC LINAC
Proceedings of IPAC2013, Shanghai, China
p. 3821

C-032
Tamura, F. et al.
COMMISSIONING OF BEAM LOADINGCOMPENSATION SYSTEM IN THE J-PARC MR
Proceedings of IPAC2013, Shanghai, China
p. 2540

C-041
Maruta, T. et al.
BEAM LOSS MONITORING AND
MITIGATION AT J-PARC DTL
Proceedings of IPAC2013, Shanghai, China
p. 3824

C-033
Futatsukawa, K. et al.
UPGRADE OF POWER SUPPLY SYSTEM FOR
RF-CHOPPER AT J-PARC LINAC
Proceedings of IPAC2013, Shanghai, China
p. 2735

C-042
Ikegami, M. et al.
RECENT PROGRESS IN BEAM
COMMISSIONING OF J-PARC LINAC
Proceedings of IPAC2013, Shanghai, China
p. 3827

C-034
Futatsukawa, K. et al.
PERFORMANCE OF CAVITY PHASE
MONITOR AT J-PARC LINAC
Proceedings of IPAC2013, Shanghai, China
p. 2738

C-043
Hasegawa, K. et al.
STATUS OF J-PARC ACCELERATORS
Proceedings of IPAC2013, Shanghai, China
p. 3830

C-035
Nomura, M. et al.
INFLUENCE OF CORE WINDING TENSION
AND RIBBON QUALITY ON THE MA CORE
RF CHARACTERISTICS
Proceedings of IPAC2013, Shanghai, China
p. 2747
C-036
Shimada, T. et al.
INNER DIAMETER CHANGE OVER THE
YEARS OF MA CORES OF RF-CAVITIES AT
THE J-PARC 3 GEV SYNCHROTRON
Proceedings of IPAC2013, Shanghai, China
p. 2750
C-037
Toyama, T.
HIGH POWER OPERATION AND BEAM
INSTRUMENTATIONS IN J-PARC
SYNCHROTRONS
Proceedings of IPAC2013, Shanghai, China
p. 3085
C-038
Takeda, Y. et al.
THERMAL SIMULATIONS OF CHARGEEXCHANGE STRIPPER FOILS FOR HIGHMELTING-POINT MATERIALS
Proceedings of IPAC2013, Shanghai, China

C-039
Liu, Y. et al.
LATTICE AND ERROR STUDIES FOR J-PARC
LINAC UPGRADE TO 50 MA / 400 MeV
Proceedings of IPAC2013, Shanghai, China
p. 3818

C-044
Hayashi, N. et al.
PROGRESS OF INJECTION ENERGYUPGRADE PROJECT FOR J-PARC RCS
Proceedings of IPAC2013, Shanghai, China
p. 3833
C-045
Hotchi, H. et al.
HIGH INTENSITY BEAM TRIAL OF UP TO 540
KW IN J-PARC RCS
Proceedings of IPAC2013, Shanghai, China
p. 3836
C-046
Morishita, T. et al.
FABRICATION OF THE RFQ III FOR THE
J-PARC LINAC CURRENT UPGRADE
Proceedings of IPAC2013, Shanghai, China
p. 3839
C-047
Tamura, J. et al.
NUMERICAL STUDY ON THE EFFECT OF
MAGNETIC SHIELD OF A BUNCH SHAPEMONITOR IN J-PARC LINAC
Proceedings of IPAC2013, Shanghai, China
p. 3842
C-048
Ao, H. et al.

J-PARC Annual Report 2013

Publications

97
ANNULAR-RING COUPLED STRUCTURE
LINAC FOR THE J-PARC LINAC ENERGYUPGRADE
Proceedings of IPAC2013, Shanghai, China
p. 3845

CONTRIBUTIONS OF ADDING SIXTHHARMONIC RFS TO INCREASE THE BEAM
POWER
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAOS02

C-049
Plostinar, C. et al.
MEASUREMENT OF RESONANT SPACECHARGE EFFECTS IN THE J-PARC LINAC
Proceedings of IPAC2013, Shanghai, China
p. 3966

C-057
Shirakata, M. et al.
J-PARC 3-50BT UPGRADE PLAN
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAOS03

C-050
Sato, H.
SAVING ENERGY AND STABILIZATION FOR
ACCELERATOR POWER SUPPLY
Proceedings of the 10th Annual Meetingof Particle Accelerator Society of Japan,
MOOS12
C-051
Fukuoka, S. et al.
MEASUREMENT OF A PROTOTYPE
COMPENSATION KICKER MAGNET IN
J-PARC MAIN RING
Proceedings of the 10th Annual Meetingof Particle Accelerator Society of Japan,
MOOS13
C-052
Yoshioka, M. et al.
CONSTRUCTION OF ACCELERATOR-BASED
BNCT FACILITY AT IBARAKI NEUTRONMEDICAL RESEARCH CENTER, INTERIMREPORT
Proceedings of the 10th Annual Meetingof Particle Accelerator Society of Japan,
MOOS16
C-053
Makimura, S. et al.
REPORT FOR MUON PRODUCTIONTARGET WITH THE 300-KW PROTON BEAM
OPERATION AT MUSE/MLF/J-PARC
Proceedings of the 10th Annual Meetingof Particle Accelerator Society of Japan,
MOOT01
C-054
Nomura, M. et al.
STUDY OF HIGH IMPEDANCE MAGNETIC
ALLOY CORE
Proceedings of the 10th Annual Meetingof Particle Accelerator Society of Japan,
MOOT10
C-055
Harada, H. et al.
OPTICS TUNING AT THE J-PARC 3-50BT LINE
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAOS01
C-056
Sato, Y. et al.
BEAM DYNAMICS SIMULATIONS IN
THE J-PARC MAIN RING: POSSIBLE

C-058
Fan, K. et al.
UPGRADE STUDY OF J-PARC MAIN RINGINJECTION SYSTEM
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAOS04
C-059
Yamamoto, M. et al.
SIMULATION OF CONTROLLEDLONGITUDINAL EMITTANCE BLOW-UP IN
J-PARC MR
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAP037
C-060
Kawamura, M. et al.
PRESENT STATUS OF KLYSTRON POWER
SUPPLY SYSTEMS FOR J-PARC LINAC 2013
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAP061
C-061
Fujimori, H. et al.
STATUS OF MUON KICKER SYSTEM AT
J-PARC
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAP074
C-062
Igarashi, S. et al.
OCTUPOLE MAGNETS FOR THE BEAMINSTABILITY SUPPRESSION IN J-PARC MR
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAP076
C-063
Tejima, M. et al.
FABRICATION SUMMARY ON THE
EQUIPMENT OF AN OTR BEAM PROFILEMONITOR FOR THE J-PARC 3-50BT
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAP078
C-064
Satou, K. et al.
RESIDUAL DOSE RATE MONITORING FOR
FUTURE MACHINE ACTIVATION CONTROLAT J-PARC MR
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAP084
C-065
Tejima, M. et al.
A TWO-DEMENSIONAL BEAM PROFILEMONITOR HAVING HIGH DYNAMIC RANGEBY USING MULTI-SCREEN
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAP086
C-066
Hanamura, K. et al.
BPM INSTALLATION AT THE HIGH
RADIATION AREA (J-PARC MR
COLLIMATOR)II
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAP089
C-067
Kamikubota, N. et al.
VIRTUAL MACHINES IN J-PARC MR
CONTROL
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAP092
C-068
Sato, K. et al.
EPICS-BASED CONTROL SYSTEMUSING VXI-11 PROTOCOL FOR SKEWQUADRUPOLE MAGNETS IN J-PARC MR
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SAP097
C-069
Tomizawa, M. et al.
ACCIDENT OF J-PARC SLOW EXTRACTION
OPERATION
Proceedings of the 10th Annual Meetingof Particle Accelerator Society of Japan,
SUOT01
C-070
Tamura, F. et al.
MOMENTUM LOSS DURING SLOWEXTRACTION IN THE J-PARC MR AND ITSCOUNTERMEASURES
Proceedings of the 10th Annual Meetingof Particle Accelerator Society of Japan,
SUOT02
C-071
Fan, K. et al.
FERRITE PROPERTY EFFECTS ON A FASTKICKER MAGNET
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP012
C-072
Hara, K. et al.
THE BUNCHING FACTOR IMPROVEMENT BY
SUPERPOSITION OF HIGER HARMONICS
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP015
C-073
Hirano, K. et al.
DEVELOPMENT OF RF CHOPPER SYSTEMAT J-PARC LINAC
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP016

Publications

J-PARC Annual Report 2013

98
C-074
Sugimura, T. et al.
DEVELOPMENT OF A 3MeV BEAM SCRAPERFOR THE J-PARC LINAC
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP017
C-075
Ohkoshi, K. et al.
OPERATION STATUS OF THE J-PARC ION
SOURCE
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP038
C-076
Hasegawa, K. et al.
CALCULATIONS OF THE HIGH FREQUENCYCAVITY USED TO MAKE A CONTROLLED
BLOW-UP OF THE LONGITUDINALEMITTANCE IN J-PARC MR
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP040
C-077
Ito, T. et al.
COUNTERMEASURE OF THE MULTIPACTOR
AT SDTL CAVITY IN J-PARC LINAC
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP048
C-078
Hori, T. et al.
IMPROVEMENT FOR THE TRIP RATEOF KLYSTRON HIGH-VOLTAGE POWER
SUPPLIES IN J-PARC LINAC
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP053
C-079
Morita, Y. et al.
POWER SUPPLY SYSTEM OF J-PARC
MAIN RING MAIN MAGNETS FOR HIGHREPETITION RATE OPERATION
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP058
C-080
Shimogawa, T. et al.
TEST DEMONSTRATION OF MAGNET
POWER SUPPLY WITH THE FLYINGCAPACITOR
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP063

Particle Accelerator Society of Japan, SUP075
C-083
Yamada, S.
UPGRADE OF SOFTWARE TOOLKITS FOREPICS INPUT OUTPUT CONTROLLERS IN
J-PARC MAIN RING
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP080
C-084
Futatsukawa, K. et al.
UPGRADE OF CONTROL SIGNAL
DISTRIBUTION SYSTEM AT J-PARC LINAC
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP086
C-085
Kimura, T. et al.
THE RESEARCH OF SPILL STRUCTURE FOR
J-PARC SLOW EXTRACTION
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP087
C-086
Futatsukawa, K. et al.
UPGRADE OF POWER SUPPLY SYSTEM FOR
RF-CHOPPER AT J-PARC LINAC
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP092
C-087
Okada, M. et al.
CONTROL OF THE MULTIPACTORING BY
THE SURFACE COATING OF THE EXCITER
ELECTRODES IN J-PARC MR
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP099
C-088
Ikeuchi, K. et al.
Anisotropic spin excitations in spin-Peierls
CuGeO3
ICM2012, J. Korean Phys. Soc., Vol 63,
333-336 (2012)
C-089
Sato, K. et al.
High-energy magnetic excitations inunderdoped La1.90Sr0.10CuO4
ICM2012, J. Korean Phys. Soc., Vol 62, 18361839 (2012)

C-081
Tejima, M. et al.
IMPROVEMENT OF MEASUREMENT
ACCURACY OF THE BEAM POSITIONMONITOR AT 3-50 BT J-PARC
Proceedings of the 10th Annual Meeting ofParticle Accelerator Society of Japan, SUP067

C-090
Sato, M. et al.
On the superconducting symmetry of
Fe-based systems — Impurity effectstudies and neutron scattering measurements
ICM2012, J. Korean Phys. Soc., Vol 62, 17261733 (2013)

C-082
Toyama, T. et al.
REPAIR AND IMPROVEMENT OF THE J-PARC
MR BPMS
Proceedings of the 10th Annual Meeting of

C-091
Nakamura, T. et al.
Evaluation of angular dependence ofneutron detection efficiencies of ZnS scintillator detectors

IEEE Nuclear Science Symposium Conference
Record, 1-3 (2013)
C-092
Ohzu, A. et al.
Optical guide property of alternative He-3
neutron detectors using solid scintillatorsfor nuclear safeguards
IEEE Nuclear Science Symposium Conference
Record, 1-4 (2013)
C-093
Sakasai, K. et al.
Application of KCl:Eu2+ Storage Phosphors
to Wide-range Neutron Detection
IEEE Nuclear Science Symposium Conference
Record, 1-7 (2013)
C-094
Maruta, T. et al.
Progress of beam commissioning andbeam loss mitigation in the J-PARC linac
after the Tohoku earthquake
J. Korean Phys. Soc., Vol 63, 1274-1279(2013)C-095
Kamiya, J. et al.
Titanium Alloy as Low Activation Vacuum
Material
J. Vac. Soc. Jpn., Vol 56, 167-171 (2013)
C-096
Ogiwara, N. et al.
Reduction of Outgassing from the Ferrite
Cores in the Kicker Magnet of J-PARC
3-GeV Rapid Cycling Synchrotron
J. Vac. Soc. Jpn., Vol 56, 159-162 (2013)
C-097
Kamiya, J.
Challenges to the Vacuum System in HighIntensity Accelerators
J. Vac. Soc. Jpn., Vol 56, 440-448 (2013)
C-098
Harjo, S. et al.
TRIP Steel Deformation Behavior by
Neutron Diffraction
Materials Research Society Symposium Proc.,
Vol 1528, (2012)
C-099
Oguri, H. et al.
Operation status of the J-PARC negativehydrogen-ion source
NIBS 2012, AIP Conf. Proc., Vol 1515, 379-385(2013)
C-100
Yamazaki, S. et al.
Beam enhancement by axial magnetic
field optimization of the J-PARC RF-driven
H− ion source
NIBS 2012, AIP Conf. Proc., Vol 1515, 433-439(2013)

J-PARC Annual Report 2013

Publications

99
C-101
Hayashida, H. et al.
Design and Demonstration of a Neutron
Spin Flipper for a New Neutron Reflectometer SHARAKU at J-PARC
PNCMI2012, Physics Procedia, Vol 42,
130-135 (2012)
C-102
Meigo, S. et al.
Development of profile monitor system forhigh intense spallation neutron source
Proc. of 1st International Beam Instrumentation Conference (IBIC 2012) MOPB68 (2012)
C-103
Oguri, H.
Power upgrade of J-PARC linac
Proc. of 4th Int. Particle Accelerator Conf.
(IPAC '13) (Internet), 2047 (2013)
C-104
Shobuda, Y. et al.
A Trial to reduce the kicker impedance of
3-GeV RCS in J-PARC
Proc. of 4th Int. Particle Accelerator Conf.
(IPAC '13) (Internet) (2013)
C-105
Miyake, Y. et al.
Ultra slow muon microscopy by laser resonant ionization at J-PARC, MUSE
6th Int. Conf. on Laser Probing (LAP 2012),
Hyperfine Interact, Vol 216, 79-83 (2013)
C-106
Harada, M. et al.
Quantitative Measurement of Element
Distributions using the Neutron-transmission Resonance-absorption Method
7th Int. Topical Meeting on Neutron Radiography (ITMNR-7), Physics Procedia, Vol 43,
314-322 (2013)
C-107
Ooi, M. et al.
Neutron Resonance Imaging of a Au-In-Cd
Alloy for the JSNS,
7th Int. Topical Meeting on Neutron Radiography (ITMNR-7), Physics Procedia, Vol 43,
337-342 (2013)
C-108
Ao, H. et al.
Dielectric constant measurement using
resonant frequencies for minimizing thereflection of pillbox RF windows
Proc. of 9th Annual Meeting of Particle Accelerator Society of Japan(Internet), 1124-1126(2012)
C-109
Ikegami, M. et al.
Beam commissioning of J-PARC linac after
Tohoku Earthquake and its beam loss
mitigation
Proc. of 9th Annual Meeting of Particle

Accelerator Society of Japan(Internet), 64-67(2012)
C-110
Ishiyama, T. et al.
Development of MLF-inhibit system for
J-PARC
Proc. of 9th Annual Meeting of Particle Accelerator Society of Japan(Internet), 714-716(2012)
C-111
Itoh, Y. et al.
Design study of J-PARC timing system
for nuclear transmutation experimental
facility
Proc. of 9th Annual Meeting of Particle Accelerator Society of Japan(Internet), 738-740(2012)
C-112
Kawase, M. et al.
Design of control system for the 2nd and3rd charge exchange system in J-PARC
3GeV RCS
Proc. of 9th Annual Meeting of Particle Accelerator Society of Japan (Internet), 734-737(2012)
C-113
Miura, A. et al.
Beam loss occurred at DTL cavity in J-PARC
linac
Proc. of 9th Annual Meeting of Particle Accelerator Society of Japan (Internet), 653-655(2012)
C-114
Oguri, H. et al.
Operation status of the J-PARC ion source
Proc. of 9th Annual Meeting of Particle Accelerator Society of Japan(Internet), 1081-1083(2012)
C-115
Okoshi, K. et al.
Beam stabilization of the J-PARC ion
source by ARC current Δ Σ feedback
control
Proc. of 9th Annual Meeting of Particle Accelerator Society of Japan(Internet), 1105-1108(2012)
C-116
Tamura, J. et al.
Beam loss reduction by the beam duct
realignment in the J-PARC linac beamtransport line
Proc. of 9th Annual Meeting of Particle Accelerator Society of Japan(Internet), 377-380(2012)
C-117
Maruta, T. et al.
Simulation study on longitudinal beamprofile measurement by using RF chopper
at J-PARC linac

Proc. of 9th Annual Meeting of Particle Accelerator Society of Japan(Internet), 420-423(2012)
C-118
Yamazaki, S. et al.
Development of a Cs-seeded RF-driven H–
ion source for the J-PARC
Proc. of 9th Annual Meeting of Particle Accelerator Society of Japan(Internet), 260-264(2012)
C-119
Yoshii, A. et al.
J-PARC operation data archiving using
Hadoop and Hbase
Proc. of 9th Annual Meeting of Particle Accelerator Society of Japan(Internet), 690-693(2012)
C-120
Oguri, H.
Present stats of the J-PARC linac
Proc. of 10th Annual Meeting of Particle
Accelerator Society of Japan(Internet),
313-317 (2013)
C-121
Ohkoshi, K. et al.
Operation status of the J-PARC ion source
Proc. of 10th Annual Meeting of Particle
Accelerator Society of Japan(Internet),
946-949 (2013)
C-122
Tamura, J. et al.
Resuming of ACS high-power test for
J-PARC Linac Energy UpgradeProc. of 10th Annual Meeting of Particle
Accelerator Society of Japan (Internet),
437-439 (2013)
C-123
Riemer, B. W. et al.
Small gas bubble experiment for mitigation of cavitation damage and pressure
waves in short-pulse mercury spallation
targets
11th Int. Workshop on Spallation Materials
Technology (IWSMT-11), Journal of Nuclear
Materials. Vol 450, 192-203 (2012)
C-124
Ooi, M. et al.
UPGRADE OF J-PARC/MLF GENERALCONTROL SYSTEM WITH EPICS/CSS
Proc. of ICALEPCS2013, (2013)
C-125
Matsuba, G. et al.
Shish-kebab formation process observation using new SANS spectrometer TAIKAN
Proc. of The 12th Asian Textile Conference,
55-60 (2013)
C-126
Sasa, T. et al.

Publications

J-PARC Annual Report 2013

100
Design of J-PARC transmutation experimental facility
Proc. of 12th OECD/NEA Information
Exchange Meeting on Actinide and Fission
Product Partitioning and Transmutation(IEMPT-12), (2012)
C-127
Kikuzawa, N. et al.
Development of J-PARC time-series dataarchiver using distributed database system
14th Int. Conf. on Accelerator and Large
Experimental Physics Control Systems(ICALEPCS 2013), 584-586 (2013)
C-128
Bakule, P. et al.
Measurement of muonium emission fromsilica aerogel
Progress of Theoretical and Experimental
Physics. Vol 2013, (2013)
C-129
Kureta, M. et al.
Design of an Alternative Plutonium
Canister Assay system (APCA) using
ceramic scintillator neutron detectors forthe safeguards NDA
Proc. of the 54th INMM Annual Meeting, (2013)
C-130
Nakamura, T. et al.
Development of a ZnS/10B2O3 ceramic
scintillator neutron detector for safeguards
NDA systems
Proc. of the 54th INMM Annual Meeting, (2013)
C-131
Wakui, T. et al.
Investigation on HIP diffusion bonding ofinvar ally to stainless steel
Proc. of IJST2013, 85-86 (2013)
C-132
Arai, M. et al.
Recent Developments of Instruments in a

Spallation Neutron Source at J-PARC andThose Prospects in the Future
QENS/WINS 2012, J. Phys. Soc. Jpn., Vol 82,
SA024 (2013)s
C-133
Ikeuchi, K. et al.
Optimization of a Fermi Chopper for an
Inelastic Neutron Spectrometer with
Focusing Guide
QENS/WINS 2012, J. Phys. Soc. Jpn., Vol 82,
SA038 (2013)
C-134
Itoh, S. et al.
Neutron Brillouin Scattering on High Resolution Chopper Spectrometer HRC
QENS/WINS 2012, J. Phys. Soc. Jpn., Vol 82,
SA034 (2013)
C-135
Itoh, S. et al.
Progress in High Resolution Chopper
Spectrometer HRC
QENS/WINS 2012, J. Phys. Soc. Jpn., Vol 82,
SA033 (2013)
C-136
Kajimoto, R. et al.
Recent Improvement of the Signal-toNoise Ratio on the Fermi Chopper Spectrometer 4SEASONSQENS/WINS 2012, J. Phys. Soc. Jpn., Vol 82,
SA032 (2013)
C-137
Nozaki, H. et al.
Diffusive Behavior of Li Ions in Garnet
Li5+xLa3ZrxNb2−xO12 (x = 0–2)
QENS/WINS 2012, J. Phys. Soc. Jpn., Vol 82,
SA004 (2013)
C-138
Ohoyama, K. et al.
Basic Concepts of Polarisation Analysis for
Neutron Chopper Spectrometer POLANO

at J-PARCQENS/WINS 2012, J. Phys. Soc. Jpn., Vol 82,
SA036 (2013)
C-139
Sugiyama, J.
Ion Diffusion in Solids Probed by MuonSpin Spectroscopy
QENS/WINS 2012, J. Phys. Soc. Jpn., Vol 82,
SA023 (2013)
C-140
Yokoo, T. et al.
Newly Proposed Inelastic Neutron Spectrometer POLANOQENS/WINS 2012, J. Phys. Soc. Jpn., Vol 82,
SA035 (2013)
C-141
Fujiwara, S. et al.
Internal Dynamics of a Protein That Forms
the Amyloid Fibrils Observed by Neutron
Scattering
QENS/WINS 2012, J. Phys. Soc. Jpn., Vol 82,
SA019 (2013)
C-142
Inamura, Y. et al.
Development Status of Software“Utsusemi” for Chopper Spectrometers at
MLF, J-PARC
QENS/WINS 2012, J. Phys. Soc. Jpn., Vol 82,
SA031 (2013)
C-143
Kamiya, J. et al.
Vacuum chamber made of soft magnetic
material with high permeability
Vacuum. Vol 98, 12-17 (2013)
C-144
Ogiwara, N. et al.
Development of a turbo-molecular pumpwith a magnetic shield function
Vacuum. Vol 98, 18-21 (2013)

KEK Reports
D-001
Paramonov, V. V.
The Summary for Optimization of theAnnular Coupled Structure Accelerating
Module Physical Design for High Intensity
Hadron Linac
KEK Report 2013-4
D-002
Fujimori, H. et al.

Working Group Report 2011-2012(Muon)
KEK Internal 2013-9
D-003
Kadono, R.
Presentations for the Muon Science
Advisory Committee (and the 11th Muon
Science Experimental Facility Advisory
Committee) (MuSAC)
KEK Proceedings 2013-4

D-004
Bessho, K. et al.
Proceedings of the 14th Workshop on
Environmental Radioactivity
KEK Proceedings 2013-7
D-005
Kadono, R.
KEK-MSL REPORT 2012
KEK Progress Report 2013-3

J-PARC Annual Report 2013

Publications

101

KEK Preprints
E-001
Ishida, T.
T2HK: J-PARC upgrade plan for future andbeyond T2K
KEK Preprint 2013-55

JAEA Reports
F-001
Watanabe, A. et al.
Upgrade of general control system
employed for Materials and Life Science
Experimental Facility of J-PARC/J-PARC物
質・生命科学実験施設の全体制御システムのアップグレードJAEA-Technology 2013-028, (2013)

JAPAN PROTON A CCELERATOR RESEARCH C OMPLEX

IbarakiTokai

J-PARCANNUAL REPORT 2013

High Energy Accelerator Research Organization (KEK)
Japan Atomic Energy Agency (JAEA)

J-PARC

J-PARCJR Joban L ine

Mito
Mt.Tsukuba

Narita

Ueno
Tokyo

0

20

40km

2-4 Shirakata Shirane, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan

http://j-parc.jp/

J-PARC Center