ANNUALREPORT2 O 1 5Vol.1: HighlightEditorial Board (April 2016 – March 2017)

Hideaki HOTCHI (Accelerator Division)

Seiko KAWAMURA (Materials and Life Science Division)

Hajime NISHIGUCHI (Particle and Nuclear Physics Division)

Makoto YOSHIDA (Cryogenics Section)

Shigeru SAITO (Transmutation Division)

Hirohito YAMAZAKI (Safety Division)

Shinji NAMIKI (Users Office Team)

Hiroshi FUKUDA (Public Relations Section)

Cover photographs: Accelerators of J-PARC
Image credit: Yuki Hayashi

J-PARC Annual Report 2015
Contents
Preface……………………………………………………………………………………………………………… 1
Accelerators………………………………………………………………………………………………………… 3
Overview of the Accelerator…………………………………………………………………………………… 3
LINAC………………………………………………………………………………………………………… 6
RCS…………………………………………………………………………………………………………… 8
MR………………………………………………………………………………………………………… 11
Materials and Life Science Experimental Facility………………………………………………………………… 13
Overview…………………………………………………………………………………………………… 13
Neutron Source…………………………………………………………………………………………… 14
Neutron Science…………………………………………………………………………………………… 15
Neutron Devices…………………………………………………………………………………………… 16
Muon Source and Science………………………………………………………………………………… 17
Technology Development………………………………………………………………………………… 18
Particle and Nuclear Physics……………………………………………………………………………………… 21
Neutrino Experimental Facility……………………………………………………………………………… 21
Hadron Experimental Facility……………………………………………………………………………… 22
Strangeness Nuclear Experiments………………………………………………………………………… 22
Kaon Decay Experiments…………………………………………………………………………………… 22
Muon Experiments………………………………………………………………………………………… 23
JSNS2 (J-PARC E56) Experiment…………………………………………………………………………… 23
Highlights-1: First Antineutrino Oscillation Results from T2K ……………………………………………… 24
Highlights-2: Charge Symmetry Breaking in Hypernuclei:
Result from the Renovated Hadron Experimental Facility ………………………………………………… 26
Cryogenics Section ……………………………………………………………………………………………… 29
Overview…………………………………………………………………………………………………… 29
Cryogen Supply and Technical Support…………………………………………………………………… 30
Superconducting Magnet System for T2K………………………………………………………………… 30
Superconducting Magnet Systems at MLF………………………………………………………………… 31
Superconducting Magnet Systems at HEF………………………………………………………………… 31
R&D for the Future Projects at J-PARC……………………………………………………………………… 32
Information System……………………………………………………………………………………………… 33
Network and Computing ………………………………………………………………………………… 33
Transmutation Studies…………………………………………………………………………………………… 37
Overview…………………………………………………………………………………………………… 37

Design of the Transmutation Experimental Facility (TEF)…………………………………………………… 39
R&D for the TEF-T…………………………………………………………………………………………… 41
R&D for the TEF-P…………………………………………………………………………………………… 43
Other activities and international collaboration…………………………………………………………… 44
Safety ……………………………………………………………………………………………………………… 45
User Service ……………………………………………………………………………………………………… 49
Users Office (UO)…………………………………………………………………………………………… 50
User Statistics……………………………………………………………………………………………… 52
MLF Proposals Summary - FY2015………………………………………………………………………… 53
J-PARC PAC Approval Summary after the 21st Meeting…………………………………………………… 54
Organization and Committees…………………………………………………………………………………… 57
Organization Structure……………………………………………………………………………………… 58
Members of the Committees Organized for J-PARC………………………………………………………… 59
Main Parameters ………………………………………………………………………………………………… 63
Events ……………………………………………………………………………………………………………… 65
Events……………………………………………………………………………………………………… 65
Publications……………………………………………………………………………………………………… 73
Publications in Periodical Journals………………………………………………………………………… 74
Conference Reports and Books…………………………………………………………………………… 78
KEK Reports………………………………………………………………………………………………… 86
Others……………………………………………………………………………………………………… 86
JAEA Reports……………………………………………………………………………………………… 86

J-PARC Annual Report 2015

Preface1

PrefaceThis volume describes the activities of J-PARC from April, 2015, through March, 2016.
J-PARC (Japan Proton Accelerator Research Complex) is a multi-purpose researchfacility based on world-class high-intensity proton accelerators built through joint efforts
between the High Energy Accelerator Research Organization (KEK) and the Japan Atomic
Energy Agency (JAEA). In a wide range of research fields, including materials and life
sciences, elementary-particle and nuclear physics and research and developments fornuclear transmutation, we aim to contribute broadly to the advancement of humankind
by promoting diverse research and development projects that cover varied areas, frombasic science to industrial applications.
Since J-PARC began its operations in 2008, we have steadily increased beam
intensities, worked hard to enhance the capability of our facilities, and achieved avariety of results appropriately reflecting the nature of a multi-purpose research facility.
However, the radioactive material leak incident at the Hadron Experimental Facility (HEF)
that occurred in 2013, caused a tremendous amount of worries and troubles to many
people. After deep reflection on this incident, we are convinced more strongly than everthat our research can only be conducted with the support of the public. To ensure thatthe same mistakes are not repeated, we worked hard to rebuild and strengthen oursafety management system and reformed our organization to ensure even greater safety
at J-PARC. We will continue to make unflagging efforts to maintain our reputation of a
research facility with a total commitment to safety.

Preface

J-PARC Annual Report 20152

Now we are happy to report that we have restarted the HEF after almost two yearsof shutdown. As you will find out, we, together with the users, have already started to
produce significant results from the facility.
The neutrino oscillation experiment, T2K (Tokai-to-Kamioka) continues to be theflagship experiment at J-PARC. The proof of electron-neutrino appearance in a muonneutrino beam has been already established in previous years. In this report, our first
results on the anti-neutrino beam will be described.
The Materials and Life Science Facility (MLF) had to stop its operations for both theneutron and muon beamlines due to a problem with the neutron target. In order tosolve the issues and develop an even stronger team to explore the frontier of targetry
technologies, we have formed a new J-PARC-wide task force. While working on the target
recovery process at the MLF, we have been able to produce many additional scientificachievements in energy materials and other fields, including industrial applications.
We would like to share widely all these achievements with the society, both inJapan and overseas. Furthermore, we would like to increase our social contributions
by enhancing the collaboration with universities, research institutions, and industries
not only by producing and sharing results, but also by fostering the next generation ofresearchers with a solid experience in cutting-edge facility operations, who can, in turn,create a new generation of researchers to uniteruppedly improve the facility for the
benefit of the future society.
“Hi-power beams for the next stage of our life!”

Naohito SAITO
Director of the J-PARC CenterAccelerators

Overview of the Accelerator
In fiscal year 2015, one of the highlights was
the resumption of the user operation at the Hadron
Experimental Facility (HD) in April, two years after the
HD incident in May, 2013. The proton beam power
for users had been successfully ramped up to 500 kW,
390 kW, and 42 kW at 3 GeV for the MLF, 30 GeV fast2

Accelerator MLF
Status
MR

3

4

5

6

MLF Tgt. failure

extraction (FX) for the neutrino experiments and
30 GeV slow extraction (SX) for the hadron experiments,
respectively. However, we had two target failures at the
MLF resulting in long downtime for replacements.
The operation in FY2015 is illustrated in Fig. 1. The
topics related to the beam operation are as follows:

7

8

9

10 11 12

Tuning/
study

1

2

3

Maintenance
FX

SX

FX

SX

Fig. 1. Accelerator operation in FY2015.

SX

FX

Accelerators

J-PARC Annual Report 2015

4(1) Operation for the MLF
After the accelerator study operation in the beginning of April, the beam delivery to MLF users was
resumed at 400 kW, the same level as in FY2014. We
increased the beam power to 500 kW, which was a new
power record for the MLF user operation. Unfortunately,
about two weeks later, the operation was suspended
due to a defect of the neutron production target.
In October, the beam delivery to the MLF wasresumed at beam power of 500 kW. However, the operation for the MLF was suspended again in November.
After the replacement of the target, the beam
operation was restarted in February, this time withconservative beam power of 200 kW to protect the target. To improve the quality of the experiments, evenat the lower beam power, the accelerator provides a
one-bunch beam instead of the regular two bunches,
which creates a shorter pulse and is preferred by some
MLF users.
(2) Operation for the Neutrino Experiments
The user run of MR-FX was started at 290 kW in

April, but the power was increased to 330 – 345 kW
thanks to parameter tuning.
The linac current for the user operation wasincreased from 30 mA to 40 mA in January. Fine tuning
study, aiming at user operation parameter setting, wasdone in the linac, the RCS and the MR. As a result of thestudy, the beam power was successfully increased to
330 – 394 kW in February.
(3) Operation for the Hadron Experiments
In April, after the performance confirmation andthe inspection by the nuclear authority, the user operation was started at beam power of 24 kW, the level at
the time of the HD incident in May, 2013. We increased
the beam power to 33 kW by the end of June.
We have accomplished a shorter acceleration timeof 1.4 seconds, the same as that in the FX mode, compared to the previous 1.9 seconds. The MR-SX cycle time
was shortened from 6.0 to 5.52 seconds. The shorter
cycle time and the machine study had increased thebeam power to 42 kW by December.

Table 1. Operation statistics in hours in FY2015.
Facility

User Time(hours)

MLF

3,579

145

1,957

1,477

41.3

NU

1,671

446

55

1,169

70.0

HD

1,752

220

15

1,517

86.6

For MLF users

Trouble, Acc.only Trouble, Fac.only Net Time(hours)(hours)(hours)

LINAC/RCS Tuning, Study, total,
1263

Srartup, etc. (1), 1259

LINAC/RCS Tuning,
Study, 1198

For MR users
Srartup, etc. (2), 522

Trouble(Exp), 15
3NBT/MLF
Tuning, Study,
total, 247

Trouble, 65
Trouble, 54
Trouble(Exp),MLF users, 1477
1957

Trouble(Acc), 219

LINAC/RCS Tuning,
Study, total, 1263
LINAC/RCS
Tuning, Study,
1198
Trouble, 65

HD users, total,
1752

HD users,
1517

Trouble(Exp), 55
Trouble(Acc), 145

Availability, toral(%)

Trouble(Acc), 446

350BT/MR/FX/SX
Tuning, Study, 1097
NU users,
1169

MLF users, total, 3579

Fig. 2. Operation statistics in FY2015. The total operation time was 6,350 hours.

Trouble, 42

NU users, total,
1671

350BT/MR/FX/SX
Tuning, Study, total,
1140

J-PARC Annual Report 2015

Accelerators

5
The operation statistics in FY2015 is shown in
Table 1 and Fig. 2. The downtime by sub-system isshown in Fig. 3. The total operation time, defined by
the shift leader assigned time, including startup and RF
conditioning, is 6,350 hours.
We had two target failures at the MLF and a long
downtime of 1,957 hours (over scaled in Fig. 3) for the
replacement. That was the main cause of the lower availability. During the interruption at the MLF, the accelerator
delivered beam to the NU or HD users by way of the MR.
At the MR, we had big troubles at the end of the
fiscal year. One was a vacuum leak in February and theother was a coil trouble in the bending magnet at theend of March. In these cases, we provided beams to the
MLF.
At the front end, the linac contributed most of thedowntime, while the RCS was rather stable. A dominantcharacteristic this year was the occurrence of numerous
troubles grouped in “Others”, which may not always happen so often. Most of the events were utility or building
related and included a cooling tower failure (19 hours),

168

a cooling water valve failure (11 hours), ventilation system stops (three times, 32 hours in total) and so on. The
next most frequent cause was an HVDC (High Voltage
DC power supply) for klystrons. This was not limited tothe power supply but also covered the high-power RFcomponents. Several defects in this group comprised ofa klystron failure, insulation breakdown of an HV cable,
and several switching devices and module failures.
Some other linac downtimes were grouped in “DTL”
and “SDTL”. The condition of the cavities was not poor,
except for some SDTL cavities with multipacting due tothe aftereffects of the earthquake. The cooling waterflow decrease contributed most of the downtime inthese groups. We adjusted the cooling water flow rates
at the weekly scheduled maintenance, but some flow
rates still dropped unexpectedly.
Most of the improvement and upgrade work, suchas installation of new beam diagnostics, reinforcementof the power supply, preparation for higher repetitionat the MR, etc. was carried out mainly during the summer shutdown. These are described in further chapters.

[hours]144

1,957hours

120
96
72
48
24

BLM
RFQ
MEBT1
DTL
SDTL
MEBT2
ACS
DBNCH
HVDC
IonSource
NagnetVAC
Others
BLM
KMPS
BM
QM
SM
ST
Bump
Sep
RF
OthersBLM
Others
BLM
QM
SM
BM
ST
RF
Injction
SlowExt
FastExt
OthersMLF
HadronNeutrino
Earthquake
PowerOutage
othere0_LINAC__RCS__3NBT_

Fig. 3. Downtime by components in FY2015.

_MR__EXP__Others_

Accelerators

J-PARC Annual Report 2015

6

Linac
The J-PARC linac has been successfully providing the required beam after the energy and intensity
upgrades. The operation history of the ion source in
FY2015 is shown in Fig. 4. The ion source has demonstrated up to 60 mA beam current. Continuous
operations of 1,100 hours at 33 mA and 1,004 hours at
45 mA, respectively, were achieved,. For the purposeof operating the ion source with short start-up time,
pre-conditioning at an ion source test-stand has been
conducted. In the pre-conditioning, the antenna failure
rate was drastically decreased from 74% to 25% by the
new pre-conditioning procedure that repeated 15-min
low RF-power operation and impurity gas evacuation a
few times before the full-power operation.
The RFQ was still the component with the highest
RF-trip rate. We observed a trip rate of approximately
15 times per day, which did not change significantly
from the last year. The beam operation resumed within
one minute after each trip. The number of trips in
the DTL1 and the SDTL5 increased just after the 2015
summer maintenance. We assume that the situation
was caused by an insufficient conditioning operation
because these cavities were exposed to the atmosphere
during the maintenance period. The trip frequency
decreased in the process of the operation, and reached
an acceptable level. The ACS was running stably in comparison with the other cavities. Currently, the total trip
rate of all ACS cavities is about 0.5 times per day, a thirdof the level at the beginning of the operation.
After the 2015 summer maintenance, the coolingwater flow rate at DTL decreased significantly, especially DTQ. Once the flow rate monitor registers the
problem, it takes at least 3 to 4 hours to enter the tunnel

that we maintain. It’s time consuming, even if it doesn’ttake long time to complete the flow adjustment work.
A regulation method that we tried in order to fix the
problem, was changing the water flow rate. This countermeasure achieved a certain result, however, we still
don’t understand the specific reason for the defect. We
will continue our efforts to find a suitable solution.
We replaced one 324-MHz klystron and two 972MHz ones due to their performance degradation in
FY2015. Both klystron operation times, as of March,
2016, are shown in Fig. 5. We have replaced five 324MHz klystrons in total from the beginning of the linac
operation. Fifteen of the klystrons have reached roughly
45,000 hours of operation. We are apprehensive thatthose klystrons may come to the end of their life in thenear future. It is important to prepare spare klystrons tokeep the operation running smoothly.
A multipactor region, with significantly increased
VSWR (Voltage Standing Wave Ratio), was observed atsome SDTL cavities after the earthquake in 2011. The
region of the SDTL5B spread further with the operation. In the 2015 summer maintenance, the SDTL5B
cavity was removed from the beam line and opened.
The internal surface of the cavity was dirty, probably
due to cracked hydrocarbons from an oil-filled vacuum
pump. There were also many foreign objects and otherdebris inside the cavity. After removing the objects
and cleaning the surface with acetone, the multipactor region almost completely disappeared, as shown in
Fig. 6. After the countermeasure, this problem has notoccurred again at the SDTL5B. We will give the same
treatment to the other SDTL cavities during the next
summer maintenance.

80
RUN#62

70

RUN#63

RUN#64

RUN#65

RUN#66

RUN#67

Beam Current [mA]

60
50
40
30
20
10

Date

Fig. 4. Operation history of the ion source in FY2015.

6
A

pr

-1

6
1-

6

-1
1M
ar

1-

Fe
b

-1

16
1Ja

n-

5
D

ec

-1

5
1-

5

ov
-1
N
1-

O

ct

-1

5
1-

-1

5
-1

1Se
p

5
1A
ug

l-1
Ju
1-

15
nJu
1-

-1
ay
M
1-

1-

A

pr

-1

5

5

0

Accelerators

J-PARC Annual Report 2015

7
Linac beam studies have been continued to mitigate the beam loss. A continuous beam loss along the
ACS section was found to exceed the linear scaling of
the peak current. Intra-beam striping (IBSt) effects ofthe H- beam were identified as the dominant beam loss
in that section. The IBSt rate is positively correlated to
the H- density and divergency and can be affected only
by lattice setting. A beam loss reduction by 40% wasshown by the beam loss monitor in the beam study,
where the transverse focusing varied systematicallyfrom the original design. Further studies are necessary
for the beam loss mitigation to achieve a 50-mA user
operation.
For the 50-mA user operation, we are modifying thebeam chopper system. During the 2015 summer maintenance, we installed a new type of scraper, increasing
the beam incident angle of from 45° to 67° to reducethe beam power deposition density on the surface.

The scraper temperature in the new conFiguration wasmeasured, and its decrease by approximately 500° wasobserved with short beam pulses. However, there was
not enough testing time to measure with long pulses,
due to the MLF target trouble. We are planning to perform the test using the off-line test stand.
Two bunch shape monitors with modified designusing outgas-conditioned materials are under testingat an off-line test stand. The vacuum pressure of both
−7
BSMs achieved 10 Pa which is comparable to the present BSM with additional TMPs. One BSM will be tested
at the 3-MeV linac test-stand and will be installed in the
MEBT1, which is the front-end part for the bunch shapemeasurement. The other one will be installed next year
in the MEBT2, the matching section between the SDTL
and ACS sections, to ensure the precise RF settings ofthe buncher cavity.

60,00018,000

HV-ON time of 324MHz Klystrons to 2016/Mar/31

HV-ON time of 972MHz KlystronUsed Klystrons

Used Klystrons

to 2016/Mar/31

16,00050,00014,000Time (h)12,00030,00010,0008,000’15 Nov 24’15 Dec 25

2,000

DB1(0501)

4,000’14 Jun 3’14 Feb 27’13 Feb 22’16 Mar 2’12 Apr 3

10,000

ACS18(0902)

6,000

20,000

Klystron station/Serial number

3.5
Jan 19, 2015 (Before cleaning)

VSWR

3

Sep 29, 2015 (After cleaning)

2.5
2
1.5

200

250

300

350

400

450

500

550

Tank Level [kW]Fig. 6. VSWR as a function of the tank level at SDTL05B before and after cleaning.

DB2(0804)

DB1(1304)

ACS21(1001)

ACS20(0802)

ACS19(0903)

ACS18(1302)

ACS17(0806)

ACS16(1301)

Klystron station/Serial number

Fig. 5. Operating time of 324 MHz (left) and 972 MHz klystron (right).

1

ACS15(0809)

ACS14(1003)

ACS13(1104)

ACS12(1107)

ACS11(1002)

ACS9(0803)

ACS10(0901)

ACS8(0810)

ACS7(1101)

ACS6(1105)

ACS5(0801)

ACS4(1106)

ACS3(0807)

ACS2(1102)

ACS1(1103)

M2B1(0001)

DTL15(0211)

DTL13(0209)

DTL2(0205)

RFQ(9902)

DTL1(0204)

SDTL16(0210)

SDTL15(1101)

SDTL14(0203)

SDTL13(0801)

SDTL12(0104)

SDTL11(0216)

SDTL9(0212)

SDTL10(0401)

SDTL8(0103)

SDTL7(0215)

SDTL6(0207)

SDTL5(0208)

SDTL4(0101)

SDTL3(0102)

SDTL2(0206)

DTL3(0202)

SDTL1(0201)

DTL2(0213)

RFQ(0214)

M2B2(0808)

00DTL1(0214)

Time (h)40,000Accelerators

J-PARC Annual Report 2015

8

RCS
Operational Status
The output power derived from RCS in the beginning of fiscal year 2015 was 400 kW, which was increased
to 500 kW on April 14. However, a cooling water leakoccurred in the neutron target at the end of April andthe supply to MLF was stopped. Operations were conducted only for MR until July 1. The operations for the
MLF were resumed on October 27, but less than a monthafter their resumption, a water leak occurred again on
November 20. A spare neutron target was installed, andthe user program was restarted on February 20. Due tothe lack of a spare neutron target following the incident,
the output power for the target was reduced to 200 kW
to protect the existing target. Fig. 7 shows a history of
the output power from the RCS.
This year, there were no serious problems in RCS,
therefore the availability of RCS itself is quite good. Its
operation time over the year has been approximately
3,828 h, excluding the commissioning time, with a downtime of approximately 36 h; therefore, its overall availability was better than 99%. About half of the down time wascaused by a problem in the pulse magnet systems (injection bump magnets and extraction kicker magnets).
400 kWMLF Op.

500 kWMLF Op.

500 kWMLF Op.

200 kWMLF Op.

1E20

Particles [#/day]

Only supply to MR
Only supply to MR

Neutron target failure

1E19

Neutron target
failure

1E18

1E17
2015/04/01

2015/07/01

2015/10/01

2016/01/01

2016/04/01

Date

Fig. 7. History of the output power from RCS.

Maintenance and Improvements
Different types of maintenance and improvement
works to reduce beam loss and ensure stable operation
were carried out during the summer shutdown period.
The two major improvements were as follows:
1) Improvement of the L3BT line
Previous beam commissioning results indicatedthat the injection beam parameters should be flexibly
adjusted to reduce the amount of RCS beam loss. Two
improvements were required to allow for this flexibility.
The first one was the installation of additional wire scanmonitors. 3 additional monitors were installed in the
L3BT line with the aim of improving the matching condition between the injection and the circulating beams.
The second one was the physical aperture extension of
the vacuum ducts in magnets. The vertical aperturesof the ceramic ducts used for vertical bump magnets
were sufficient for the original beam condition, but
recent study results indicated that wider beam optics
would be more appropriate for achieving finer, low-loss
matching conditions. Therefore, the old ceramic ducts
were replaced with wider ones (see Fig. 8).
2) Anode power supply upgrade of the RF system
A 1-MW beam trial indicated that the anode power
supply to the RF system did not have enough margin
to complete sufficient beam loading compensation forsuch a high-power beam. The original anode power supply consisted of 15 inverter units, and we modified theframes of the power supply to accommodate for 4 additional inverter units on the roof of the supply system (seeFig. 9). We have 12 anode power supplies and 3 inverter
units per anode power supply unit were prepared during the 2015 summer shutdown period. A total of 36
additional inverter units was installed, and the maximum
anode current was increased from 124 A to 148 A.
Residual Dose Distributions and Exposure Dose during Maintenance
Before the 500-kW operation, we rectified the modulation of the beta function with a new quadrupole
magnet system, and expanded the painting injection area (see the “Beam commissioning” section). As
a result, the dose rate of the foil chamber, which wasabove 10 mSv/h after a 400-kW operation, decreased
to less than this value even after a 500-kW operation.
Based on these results, we intended to increase the output power to 600 kW for MLF in mid-May, but the supply
to the MLF was stopped after the first cooling waterleak and operations were conducted only for the MR
until the summer shutdown period. The duty requiredfor operating the MR is less than 10% of that requiredfor operating the MLF, and the number of acceleration
particles required is also less than 10%. Therefore, allresidual doses in the RCS were reduced. The residual
dose in the foil chamber decreased to 3 mSv/h because
the radioactive nuclides with short half-lives disappeared during this period. This value did not decreaseover the maintenance period because of the presenceof nuclides with longer lifetimes.

J-PARC Annual Report 2015

Accelerators

9

Old:narrow

New:
Wide

Fig. 9. Reinforcement of the anode power supply system.

33 workers were exposed to a residual dose of morethan 0.01 mSv during the summer shutdown period,
and the corrective dose of these workers was 4.45 mSv.
Table 2 shows a summary of workers’ personal doses
while performing maintenance work during the summer shutdown period. The number of workers who
were exposed to more than 0.1 mSv residual dose was15, and the maximum quantity of dose received by any
worker was 0.42 mSv. Our objective is a residual doseof less than 1 mSv for any worker, therefore this result
is acceptable.
A large amount of residual dose was not observed
even after 500-kW operations. The residual dose distribution was similar to the result observed the previous
year for the 300-kW operations, wherein higher radiation doses were concentrated in the injection area.
Thus, the significant dose exposure was caused by theworks in that area.

Beam Commissioning
1) Confirmation of the effectivity of the RF upgrade
A test with a 1-MW beam was conducted after the
RF anode power supply was upgraded. Fig. 10 shows acomparison of beam loss signals before and after the
upgrade. Before the upgrade, a resonance frequency ofan rf cavity was temporarily set to 2.1 MHz to reduce
the required anode current below the output limit of
the power supply. In that case, the beam behavior was

Exposure dose [mSv]0.01-0.05
0.06-0.1
0.11-0.2
0.21-

Number of workers [#]
11
7
7
8

BLM sigmal (arb.)

Table 2.	Summary of workers’ personal doses during maintenance work conducted during the 2015 summer
shutdown period.

BLM sigmal (arb.)

Fig. 8. Extension of the duct aperture.

400
300

(a) Before upgrade– 8.41 × 1013 ppp : 1010 kW-eq.
– 7.86 × 1013 ppp : 944 kW-eq.

2

8

10

12

14

16

18

20

8

10

12

14

16

18

20

200
100
0

0

400

4

6

Time (ms)(b) After upgrade

300
200
100
0

0

2

4

6

Time (ms)Fig. 10. Beam loss monitor signals in a high dispersion area(a) before and (b) after the RF power supply upgrade
needed for a high-power beam operation. The red
13line shows the loss signal for 8.41 × 10 particles per
13
pulse, while the blue line indicates 7.86 × 10 particles per pulse.

Accelerators

J-PARC Annual Report 201510very unstable and we observed some beam loss. Afterthe upgrade, the resonance frequency came back to
the original value of 1.7 MHz, because we were able tofeed enough current from the anode power supply, andthen the beam stability was restored. The beam loss signals demonstrated that the longitudinal beam loss wasremoved by a sufficient feedforward tuning of the RF
system.
2) Beam tuning conducted to expand the transverse
painting area and mitigate further the RCS beam loss
The next area to focus on, after the major beamloss had been minimized, was the reduction in thelosses caused by the foil interaction. Fig. 11 shows theaverage number of foil hits per particle during a beam
injection under different types of operational conditions. As it can be seen, a large painting area results in alower number of foil hits. However, that has never beenrealized because such a large painting area (>100 pmmmrad.) increased the additional beam loss other thanthe loss caused by foil scattering. Numerical simulations
and experiments revealed that this increase in beamloss was the result of modulation of the beta function
caused by the edge effect of the injection bump magnets. Thus, we compensated for this modulation byusing additional quadrupole magnets. We also adopted
an anti-correlated painting pattern and optimal tune
variation during the acceleration process. These efforts
helped us to extend successfully the painting area to
200 pmm-mrad. and this resulted in further beam loss
mitigation.

50
ID1: εtp=100π mm mrad, W=30 mm, ∆x=13mm

45

41

40

ID2: εtp=100π mm mrad, W=20 mm, ∆x=9mm
ID3: εtp=150π mm mrad, W=20 mm, ∆x=9mm
ID4: εtp=200π mm mrad, W=20 mm, ∆x=9mm

Number of foll hits

35
30
25

21
Charge-exchange foil
(330 μg/cm2-thick HBC)

20

Injection

15

W=30 mm beam

10

7

5
0

12

∆x=13 mm

Dx=9 mm

W=20 mm

0

0.5

1

1.5

2

The foil was pulled
out by 4 mm and its size is also reduced

2.5

3

3.5

4

4.5

5

Parameter ID

Fig. 11. Average number of foil hits per particle during beam
injection under different beam injection conditionsin the RCS.

3) Beam tuning for beam loss mitigation in the MR
The MLF needs a wide beam, generated by a larger
transverse painting, to mitigate the shock wave on theneutron target. In contrast, the MR requires a low emittance beam, generated by a smaller transverse painting,to avoid beam loss. To satisfy the MR requirement, weinvestigated different ways to improve the transverse
painting area and tune variation.
The results of our study indicated that a 50 pmmmrad. correlated painting provided the smallest RMS
beam width. This empirical observation agreed wellwith the simulated results.
The tune variation during the acceleration process
was also investigated, and a better condition for making a smaller beam emittance was obtained; however,this condition caused more beam instability after the
middle phase of the acceleration period. One possible
solution to avoid this instability is to increase the negative chromaticity in the middle and later phase of theacceleration period. To realize such a chromaticity control, bipolar excitations are required for the sextupole
magnets. But only the positive or negative chromaticity
can be generated by the present power supply systemof the sextupole magnets. We will therefore modify thepower supply system to meet the requirement.
Summary
The output power of the MLF was initially kept at
400 kW in the current year and was increased to 500 kW
in mid-April. However, a cooling water leak occurred
twice in the neutron target, thus forcing the output
power to be reduced to less than 200 kW. The beam
power for the MR, however, was satisfactorily increased
to a 600-kW equivalent. Some improvements wereaccomplished during the summer shutdown period.
The anode power supply for the RF acceleration system
was reinforced to reduce beam loss at the arc section.
To obtain better conditions resulting in less beamloss, we carried out beam commissioning. This resulted
in the extension of the painting area and optimizationof the operating conditions. A low emittance beam condition for the MR was also investigated, and the resultsof this study indicated that a modification of the existing sextupole magnet power supply system is required.

J-PARC Annual Report 2015

Accelerators

11

MR

500
[kW]

FX

FX

Beam power

400

SX : Slow extractionfor Hadron Exp.

the power supply. Thus, the design of the building has
already started.
Although the injection kicker magnet is fastenough for a 1.3 s repetition rate, the pulse of theelectric current has small bumps just after the main
pulse, as shown in Fig. 13. The bump kicks the previously injected beam, so that the kicked beam orbit isdistorted and lost soon. Thus, a compensation kicker,
which corrects the distorted orbit of the beam kickedby additional bump, was installed in the summer of
JFY2015. It has been confirmed that the kicker magnet
compensated the distorted orbit successfully.
Fraction of current

Overview
The J-PARC Main Ring synchrotron (MR) of J-PARC
has two user facilities. One is the Neutrino Experimental
Facility and another is the Hadron Experimental Facility.
The former uses the fast-beam extraction (FX) modewith a repetition period of 2.48 s. The latter uses theslow-beam extraction (SX) mode. Its repetition period
is 5.52 s.
The beam power history of MR in FY2015 is shownin Fig. 12. As shown in the Figure, beam power of 394 kW
was achieved for the FX mode, while that of 42 kW was
also achieved for the SX mode.
The details of the MR operation in JFY2015 arereported in the following section.

1

0.8

w/o SUC
w/ SUC

0.6

0.4

300

FX : Fast extraction
for Neitrino Exp.

0.2

200

0
0
100

SX

SX

0
04/01/2015

06/01/2015

SX

08/01/2015

11/01/2015

01/01/2016

04/01/2016

Fig. 12. Beam power history of MR.

Replaced Equipment of MR
The designated beam intensity of the FX mode is
750 kW. We are going to achieve that intensity by reducing the repetition period from 2.48 s to 1.3 s. To reduce
the repetition period, we have to upgrade the magnet
power supplies and the RF cavities. Furthermore, we
installed the compensation kicker at the beam injection area.
MR has 9 RF cavities. One of them had been
replaced in 2014 with a high-gradient cavity and 4 morecavities have also been replaced with high-gradientones during the summer shutdown period in 2015. The
remaining 4 cavities will be replaced in the summer of2016.
However, the production of the new magnet
power supply has not started due to the lack of budget.
Fortunately, the budget was approved at last in JFY2016
for the magnet power supply and the new building for

1

2

3

4
time (sec)

×10

-6

Fig. 13. Pulse pattern of the injection kicker magnet.
Black line: Slow rise time without the speed up
circuit (SUC).
Red line: Fast rise time with SUC. This pattern isused with the compensation kicker magnet.

FX Mode Operation
We increased the beam intensity from 300 kW
to 394 kW for the FX mode by the end of JFY2015. It
means that a beam with 2 × 10E14 protons per pulse
was accelerated. This beam intensity is equivalent to
750 kW, if the cycle time were 1.3 s, instead of 2.48 s.
During FX mode operation, the beam loss in MR was
approximately 1 kW. The loss was distributed in several
locations and was well below the collimator limit of
2 kW.
A study with a higher intensity beam with 8 bunches
showed a promise of beam power acceleration above
500 kW, even before the upgrade of the power supply. Furthermore, the projection extrapolated from thetwo-bunch beam study shows the possibility for beam
power acceleration of more than 1 MW. Of course, thatwould require some loss reduction.

Accelerators

J-PARC Annual Report 201512

Current

SX Mode Operation
The SX mode was suspended until April, 2015,
because of the radiation leakage incident that happened at the Hadron Experimental Facility in 2013. A
lot of official procedures and improvement of the radiation protection system of the facility were required
to restart the hadron experiment. Finally, the requirements were met completely by the beginning of 2015.
As a result, the SX mode resumed on April 9, 2015. The
beam study was started with very low beam intensity(3 kW) because it was necessary to check the SX modesystem carefully. Then the beam power was gradually
increased. Beam of up to 33 kW was delivered to the
Hadron Facility before the summer of 2015.
During the summer maintenance period, the repetition period of the SX mode was reduced from 6.00 s
to 5.52 s by reduction of the acceleration period from
1.9 s to 1.4 s, which is the same as that of the FX mode.
It increases the beam power by approximately 9%. As aresult, the beam power of the SX mode was increased
to 42 kW from the operation in October, 2015, with

2.93 s
6.0 s

Time2.93 sTime

Current

1.9 s

1.4 s

5.52 sFig. 14. Magnet current patterns of the SX mode.
Top: Previous pattern.
Bottom: New pattern.

excellent efficiency (99.5%) and good beam quality(duty factor 42%).
The SX mode at 24-25 GeV was investigated toreduce the power consumption during slow extraction.
(since the SX mode has a long flat top period (about 2 s,
as shown in Fig. 14), the electric power consumption ismuch higher than that of the FX mode. The power consumption of the SX mode at around 24 GeV is almost
consistent with that of the FX mode.) However, at thatenergy, the magnet power supplies were found to be
insufficiently stable, which prevented efficient slow
extraction.
Slow extraction studies will continue to push theintensity higher. The present target power is 50 kW,
which is limited by the hadron target performance. An
upgraded target capable of 70-75 kW is expected to beinstalled in 2017.
TroublesTwo troubles, which stopped the beam operation for almost a week, happened at MR at the end of
JFY2015.
The first one was a vacuum leak of the beam duct.
It happened at the flange connection part of the ductof the abort dump beam line on February 25, 2016.
It was caused by a beam kicked accidentally by theabort kicker. The beam struck the metallic vacuum seal
between the flanges. As it was provably induced by anoise signal, we adopted several counter noise procedures. The leakage was fixed soon and the neutrino
experiment was resumed on March 3, 2016.
The second trouble was the short-circuit of thethcoil of the 67 bending magnet (BM067). It happened
on March 29, 2016. The cause of the short-circuit was
the very slow leak of the cooling water from the brazing point of the hollow coil of BM067. As it was hard to
fix the coil, BM067 was replaced with a spare bending
magnet. The excitation of the new BM067 started on
April 8, 2016.

Materials and Life Science
Experimental Facility
Overview
In this report we overview the activities in J-PARC
MLF in 2015. The user operation in 2015A started on
April 19, 2015 with a beam power of 500 kW. However,problems with the target vessel that happened on April
30 and November 20, forced us to stop the user program. To accommodate the unperformed experiments,
delayed due to the trouble, we decided to cancel thecall for proposals for the 2015B period.
After the incident in November, we received urgent
requests from users to resume the MLF operation, andwe decided to use an alternative spare target, which hadmechanically robust structure but lacked the helium gas
bubbling system, necessary for a stable operation witha power higher than 300 kW. After the replacement of
the spare target, we resumed the user operation with abeam power of 200 kW on February 20.
In 2015, the operations ran with an efficiency of 45%.
The number of unique users was 628 (559 for neutron, 69

for muon), and the number of proposals for general use
was 305 (268 for neutron, 37 for muon), which was about
half of the numbers for a normal year because of the cancellation of the call for proposals in 2015B. The fraction ofindustrial use was 16.4% of the approved proposals.
As for the Muon Science Facility (MUSE) in MLF, thesuperconducting solenoid coils (SSC) and their coolingsystem were partially damaged in the Great East Japan
Earthquake in 2011 and temporarily fixed for quick restoration. In the 2015 summer shutdown period, thereplacement of the superconducting solenoid coils (SSC)on the D-line was carried out. A good news for MUSE wasthat the first surface muon beam was successfully delivered
to the S1 area at the end of new S-line in November, 2015,
and the first ultra-slow muon was generated in the U-line.
We will do our best to ensure a stable operation in
J-PARC MLF and produce fruitful results in science andindustry.

Materials and Life Science Experimental Facility

J-PARC Annual Report 201514

Neutron Source
Twice in 2015, we had problems at the neutron
source, when the water-cooled shroud of the neutron
production mercury target leaked during the operating periods with proton beam power of 500 kW.
Furthermore, significant performance degradation
appeared in the helium refrigerator of the cryogenichydrogen circulation system for the moderators. Thosetroubles interrupted the MLF user program for a longtime.
The first target trouble occurred on April 30, after
the beam power was ramped up from 400 to 500 kW on
April 14. In this case, the leak was to the outside of the
shroud and the location was specified on a seal weldaround a bolt in the shroud. We concluded through adetailed analysis that the diffusion bonding interface
between the water shrouds was detached by welding
thermal deformation in the fabrication process, followed by seal welding failure by the crack propagationinduced by repeated thermal stress due to beam trips.
The shortcoming was eliminated during the fabrication process of the next target vessel and so the seal
welding around the bolts was changed to full-penetration welding. However, a second trouble occurred after
a 159-MWh operation at 500 kW on November 20, in
which the leak was to the inside of the shroud. Since
it was difficult to inspect the inside of the target vesselat MLF, the leak location was not identified. Along withthe analysis, a mockup weld test piece demonstrated
that this location was susceptible to weld cracking that
could propagate by thermal fatigue to a leak.
Since the facility’s goal is a 1-MW operation, thetarget vessel must be redesigned to achieve a reliable
operation. We employed a monolithic design feature
for the forward part of the new target vessel to eliminate weld and bolts in the high-stress region of thedesign. The redesigned target vessel will be fabricatedin the next fiscal year, 2016.
Until then, we decided to use the spare target
vessel, whose water shroud structure was mechanically more robust, although it did not equip the gas
micro-bubbles injection system, necessary for a stable
operation with intensity higher than 300 kW. Therefore,
we restarted the MLF user operation with a 200-kW
beam on February 20, 2016. The changes of the target
structure design so far are shown in Fig. 1.

Fig. 1. Changes of target vessel structure so far.

As for the performance degradation of the helium
refrigerator, it became significant during the operating
period in November, 2015, when the pressure difference at the heat exchangers and the internal adsorber(ADS) rose during the three-week operation, leading toa temperature increase at the heat exchangers, influencing the temperature control at 20 K in the hydrogensystem.
We regenerated the charcoal of the oil-separatorof the compressor, which could be the source of watercontamination at the heat exchangers and ADS. Oncethe operation was restarted, however, the pressure difference began to increase at almost the same rate aswith the previous operation, although it went down to
the initial value at the beginning, suggesting anothercause, such as oil contamination.
We took measures to reduce the helium flow to suppress a source of oil contamination at the compressorof the helium refrigerator and then chose operationalmode of 3-week operating period, followed by a 6-day
short maintenance (purification). For the operating
periods from February 20 to the end of March, 2016, theperformance degradation was acceptable enough tofulfil the 3-week operation. We will take every measure
to solve this problem in the summer shut-down periodof 2016.

J-PARC Annual Report 2015

Materials and Life Science Experimental Facility

15

Neutron Science
1. User Program
The user program of the 2015A period started on
April 19 with 18 neutron instruments and commissioning activities for 2 beam lines with 500 kW and wasinterrupted on April 30 due to the target problem. On
October 27, we resumed the user program, which wasagain interrupted on November 20, due to another target problem. On February 20, we resumed again theuser program with 200 kW.
For the 2015A period, 168 general use neutron
proposals were approved by the MLF Advisory Board
after a review at the Neutron Science Proposal Review
Committee. We cancelled the call for proposals for
2015B to accommodate the 2015A experiments. We
had to carry over a total of 70 experiment days from2015 to the 2016A period.
2. Instruments Development and Construction
The commissioning of the neutron spin echo (NSE)
spectrometers VIN ROSE at BL06 was progressed by
Kyoto University and KEK. By refining the NSE signal, an
effective 200-kHz TOF-MIEZE signal was observed successfully in October, 2015. The construction of POLANO
at BL23 by Tohoku University and KEK advanced and it
is expected to accept the first neutron beam in FY2016.
The energy-resolved neutron imaging system, RADEN,
at BL22 was completed and opened to the user program as a public beamline instrument from the 2015A
period.
3. International Activities
In 2015, we hosted the following meetings:- Workshop on Neutron Wavelength-dependent
imaging-7 (May 31 - June 3, 2015, in Mito)- The 2nd International Advisory Committee Meetingon RADEN (June 4, 2015, in Tokai)- The 1st Japan-Korea Joint Workshop on Polarized
Neutron Reflectometry (July 30, 2015, in Tokai)
From December 2 to 5, the joint school of the 7th
AONSA Neutron School and the 3rd MLF School washeld (Fig. 2). Although J-PARC had no neutron or muon
beams at the school unfortunately, 41 participantsfrom the Asia-Oceania region studied experimental
setup and data analysis, followed by comprehensive
lectures.

Fig. 2. Photo at the farewell party of the joint school of the 7th
AONSA Neutron School and the 3rd MLF School.

4. Resultant Outcomes
The research activities in neutron science at MLF
resulted in more than 110 papers. The number includes
articles in influential journals such as Nature Physics
and Nature Communications.
The PLANET beamline group won the Technology
Prize of the Japanese Society for Neutron Science forthe development of PLANET, the powder diffractometer, which specializes in high-pressure experiments.
Susumu Ikeda, emeritus professor at KEK, received
the Achievement Prize from the Japanese Society for
Neutron Science for his contributions to the pulsed
neutron scattering facility and observation of hydrogenin materials.
We distributed 6 press releases on scientific outcomes and technical development from our beamlines:- Just a touch of skyrmions: Skyrmions for new highdensity memory devices. (October 13, 2015)- Comprehensive use of neutron, X-ray and super-computer for the development of tire rubber: Developmentof high-performance tire technology by Sumitomo
Rubber Industries, Ltd. (ADVANCED 4D NANO DESIGN).
(November 12, 2015)- Diffusion process analysis of super ionic conductor
towards all solid-state ion battery. (January 20, 2016)- Hydride-ion conduction makes its first appearance.
(March 18, 2016)- Solid electrolytes open doors to solid-state batteries.
(March 22, 2016)

Materials and Life Science Experimental Facility

J-PARC Annual Report 201516

Neutron Devices
Neutron devices can also contribute to the production of the most outstanding science in the world. The
Neutron Instrumentation Section in the MLF has beendeveloping advanced neutron devices, such as neutron
detectors and optical devices.
As for neutron detectors, we conducted successfully the high-pressure operation of a two-dimensional
gaseous neutron detector. In such neutron detectors, itis necessary to increase the gas pressure of the detector to achieve high detection efficiency. However,
the increase of gas pressure results in decrease of themagnitude of the output signal. Thus, the supply voltage must be increased enough to boost the gas gainof the detector element. Consequently, we have developed a pressure vessel that can withstand pressuresof up to 0.8 MPa, and a dedicated two-dimensional
multiwire-type detector element for individual signal
line readout to ensure that the detector system canbe operated satisfactorily, even at high gas pressure.
Demonstration experiments were performed using agaseous mixture of He and carbon tetrafluoride (CF4) at
a total pressure of 0.8 MPa (He/CF4 = 0.71/0.09). Figure 3
shows the pulse-height distributions under neutron
irradiation by changing the supplied voltage to anodewires. A signal-pulse peak of neutrons can be observed
clearly. This indicates that only neutron events can beeasily detected by suppressing the spurious events
observed in the lower channels due to electronic noiseand gamma events with a conventional pulse height
discrimination method.
As for optical devices, accessible length scale ofthe in-plane structure in polarized neutron off-specular scattering (OSS) measurement has been studied todevelop high-performance polarizing supermirrors.
The OSS measurement using polarized neutrons is oneof the powerful techniques to observe correlations ofsmall magnetic objects in layered systems. However, theOSS has its own accessible range and resolution of thelateral component of the momentum transfer q. Thus, it
is important to verify, if the length scale of the in-planestructure of the sample matches the in-plane q-range
and resolution, which corresponds to the in-plane component of the coherence volume, or the length scaleof the measurement. Assuming a scattering geometry,
where the sample surface is parallel to the (x, y) planeand neutrons incident on the sample are scattered
within the (x, z) plane, it is difficult to obtain enough-1
scattering intensity over full qx-range for qz > 0.5 nm
in the OSS measurement, which results in accessible qx-1
range limited to | qx | < 0.01 nm . On the other hand, thecoupled areas with uniform orientation of the spins aremodeled as rectangular boxes with lengths of 2ξ within
the plane, where ξ is the lateral correlation length forthe magnetic scattering, in other words, the size of anarea, in which the spins are aligned to the same direction. In this case, the structure factor is expressed to be
2
proportional to the Lorentzian function, 1/{1+(qx･ξ) }.
Figure 4 shows the Lorentzian profiles for different
values of ξ. The full width at half maximum of theLorentzian function becomes comparable to the accessible qx-range with decreasing ξ. This means that only asmall part of the full peak profile is measured, making
the determination of ξ more ambiguous. To determine
ξ with accuracy, the condition of qx,max ･ξ ≫1 has to besatisfied, which follows ξ > 100 nm, where qx,max is the
maximum value of | qx | in the measurement.

12
2700
2600
2500

10
8

Structure factor (A. U.)

Measured signal (arb. unit)

Anode voltage (V)Neutron signals

6
4
2
0

100

10-1

-0.0150

50
100
Pulse height (ch)Fig. 3. Pulse height distribution from anode lines.

150

-0.01

-0.0050
qx (nm-1)

0.005

0.01

0.015

Fig. 4. Structure factors proportional to the Lorentzian2function, 1/{1+(qx･ξ) }. Green, black, red, and bluelines is the profile with ξ = 400, 200, 100, and 50 nm,
respectively.

J-PARC Annual Report 2015

Materials and Life Science Experimental Facility

17

Muon Source and Science
1.	S afety Reinforcement for Muon Beamlines/
Instruments
While the MLF operation was resumed for neutron
beam delivery in February, 2015, after the fire incident inJanuary, 2015, the Muon Section staff had concentrated
on the reinvestigation of the beamline components andinstruments to confirm that it was safe to restart theoperation of the D-, U-, and S-lines after the fire incident
at the MUSE. Following the tightened safety measures
implemented by the J-PARC Center, instruments anddevices dealing with high power electricity (such as
magnet power supply) were checked with utmost care.
The results of the reinvestigation were reviewed by the
MLF Safety Panel for each beamline successively, andthey were endorsed for operations by the end of May,
2015. Since the operation of MLF had to be stopped
again due to the neutron target vessel trouble, the muon
beam delivery did not resume until the next autumn.
2. Renewal of the Superconducting Solenoid on the
D-LineOne of the major tasks for the muon staff in the2015 summer shutdown period was the replacement of
the superconducting solenoid coils (SSC) on the D-line(Fig. 5). The SSC and its cooling system were partiallydamaged in the Great East Japan Earthquake in 2011
and were temporarily fixed for quick restoration. Since
then, the muon staff have been working in a stepwise
fashion with the aim of the complete recovery of thewhole system. Following the replacement of the helium
compressor system last summer, they proceeded to
the final step of replacing SSC. Last July, the cannonshaped gigantic cryostat, containing the old SSC (~6 mlong), was pulled out from the channel on the wall

separating the experimental hall from the M2 tunnel,
and the brand-new SSC in an orange-colored cryostat
was finally set up in a fixed position and connected tothe cooling system. The soundness of the entire system
was proven by the subsequent test operation for cooling and magnet excitation, conducted in collaboration
with the J-PARC Cryogenics Section, and put into service for beam operation from October, 2015.
3. Replacement of the Proton Beam Scraper
Another major task in the summer of 2015 was thereplacement of the beam scraper system on the primary
proton beamline (Fig. 6). The scraper, consisting of a setof water-cooled massive copper collimators, is placed
just behind the muon production target to clean up thebeam halo induced by scattering in the muon target.
It turned out that one of the thermometers
monitoring the local temperature was not operating
properly, which led to the decision to replace the entire
system considering the scheduled beam power increment towards the end of FY2015. In early September,the replacement work was successfully conducted withspecial precautions to prevent radiation hazard. The
used scraper is now safely stored in one of the storagepits for highly radioactive instruments.

Fig. 6. Proton beam scraper unit fabricated with improved
design.

Fig. 5. New Superconducting Solenoid being craned to theposition of installation.

4. Beam Commissioning of the S-Line to the S1 Area
In Experimental Hall No.1, the first surface muon
beam was successfully delivered to the S1 Area at theMaterials and Life Science Experimental Facility

J-PARC Annual Report 201518
end of the new S-line in November, 2015 (Fig. 7). The
beamline had been completed a year ago, however,
the original plan of commission had to be postponeddue to a series of incidents at the MLF, the fire incident
at the MUSE and the trouble with the neutron target
vessel, which led to the unscheduled shutdown of the
MUSE until the resumption of the MLF operation in late
October, 2015.
The first beam at the S1 area still brings great
excitement to the muon community. Even though the
S-line has been delayed and there are ever-increasing
demands, the supply of beam time will catch up.

Fig. 7. Part of the S-Line completed to the S1 Area (the first offour planed branches).

Technology Development
The technology development section is responsiblefor developments of sample environment equipment,such as cryostats, furnaces, neutron-devices, such as
3He spin filters, pulsed magnet, and resolving the safetyissues in the experimental halls.
This year, we report achievements in the safetyissues at the experimental halls.
1. Radiation Safety
Regarding the upcoming 1-MW operation, permitted in the radiological license last year, we plan tomeasure the dose rates at all estimation points in MLF
after the increase of the proton beam power, in order
to confirm the shielding performance. In 2015, we
performed a measure of the dose rates at the 450-kW
operation in March and at the 560-kW operation in
April. As a result, it was confirmed that the dose rates
measured at all estimation points in the operation
were lower than the values entered in the application,even if the measured values were scaled to the 1-MW
operation.
2. Chemical Safety
Chemical safety checks of user-brought chemicalmaterials, such as specimens and reagents, to evaluate
toxicity and confirm the chemical stability of the actual
physical form, such as powder, solid, liquid and gas,
were performed successfully by the chemical safety
team, along with confirmations of actual materials by
individual beam line staffs. A total of approximately
3800 materials was checked in 2015. As a result,
there were no serious problems with the performedexperiments.

3. User-Brought Equipment Safety
There are many pieces of user-brought equipmentin MLF, for example cryostats, magnets, furnaces, gaschamber systems, etc. So, the equipment safety team,which is consists of electrical safety staff, mechanicalsafety staff and general technical staff, checked various
items of user-brought equipment. The total number ofsafety checks in 2015 was 49. As a result, there were noserious problems with user-brought equipment. Firstly,a safety check is performed about the specificationsof the interlock system, electric circuit, cable specifications and terminal treatments, monitor system, etc.
Next, it is confirmed whether the interlock system operates correctly. Figure 8 shows part of a permission slip
as an example of check report.

Fig. 8. Permission sheet for user-brought equipment.

J-PARC Annual Report 2015

Materials and Life Science Experimental Facility

19
4. Crane Safety
There are two cranes in each experimental hall(Experimental Hall No.1 and Experimental Hall No.2).
These cranes are used by technical staffs or constructors to change an experimental setup in the beamtime
and perform summer maintenance.
The safety and the effective schedules of craneusage are planned by the crane safety team. Also,that team checks the mechanical sling, lifting sling,etc. every month and replaces the old ones with newones, if necessary. Furthermore, a crane operator, whowants to use the cranes in the experimental halls, needs
to attend hands-on training by the crane safety teamstaff before the actual operation. For those works, it isnecessary to form a work team, which includes a crane
operator, slinging operator and observer, according to
the rules. As a result, there were no serious troubles
with the crane operations.

Particle and Nuclear Physics

Neutrino Experimental Facility
The Neutrino Experimental Facility hosts the T2K
experiment: an international collaboration that includes
456 researchers from 11 nations.
In 2015, T2K accumulated data mostly in the antineutrino mode. The first antineutrino measurement
results have been published [1]. As of March 31, 2016,20
T2K accumulated 6.07 × 10 protons on target (POT) in20
the antineutrion ode in addition to 7.12 × 10 POT in
the neutrino mode since the beginning of the experiment. Later on the results are described in detail in the“Highlights-1” section of this chapter.
During the maintenance period, the helium cooling pipe of the target, which showed a small gas leak atthe end of the previous run, was successfully replacedusing the full remote operation system with manipulators in the hot cell.
Reference[1] Phys. Rev. Lett. 115, 121604 (2015).

Particle and Nuclear Physics

J-PARC Annual Report 201522

Hadron Experimental Facility
The Hadron Experimental Facility (HEF) of J-PARC
serves fixed target particle and nuclear physics
experiments with hadron beams produced by theslowly-extracted (SX) 30 GeV proton beam from theMain Ring accelerator. The renovation of the facility wascompleted in FY2014, and the user operation resumed
on April 24, 2015. In FY2015, for four months, stable user

operation of HEF was achieved. The SX beam power
was gradually increased; it started from 24 kW, with 6.0
second repetition cycle, and ended in December at 41.6
kW with 5.52 second repetition cycle. Four beam lines;,
K1.8, K1.8BR, KL and K1.1BR for high-intensity K-mesons(kaons), were operated during that period.

Strangeness Nuclear Experiments
The E13 experiment performed γ-ray spectroscopy
4
19
of light hypernuclei LHe and LF produced by charged
kaons. The hyper-nuclei were identified by measuring
the outgoing charged π-mesons, and the γ-rays were
measured by the Ge detector array named Hyperball-J.
Several new peaks have been observed in the spectra
19
of LF, which are shown in Fig. 1. The spin-spin effective
interactions between Λ in the s-state and the nucleon in
the sd-orbit are expected to be understood from thesepeaks.
The E15 experiment, designed to search for the−
K pp bound state, accumulated 10% of the requested
data. In addition to the search in the missing mass spectra, direct detection will be attempted by reconstructing−−
the decay products in K pp → π pp in the cylindricaldetector system. A pilot run of the E05 experiment,
designed to observe Ξ hypernuclear bound states forstudies of the Ξ nucleus potential, was also carried out.

The SKS superconducting spectrometer, used in E13
and E05, was moved out of the K1.8 experimental area.
A new KURAMA spectrometer was installed for theupcoming experiments.

Fig. 1. γ-ray spectrum of the 19ΛF run. The black histogram
19
shows the spectrum gated in ΛF bound state, while
the red hatched one shows the spectrum gated in thehighly-unbound region. Peaks were observed at 315
and 895 keV.

Kaon Decay Experiments
The E14 KOTO experiment is designed to study therare decay of the long-lived neutral kaon into a neutral
π meson and a pair of neutrinos. Detecting this decay0
is a challenge because only two photons from π are
observable, and the decay has not been observed yet.
The correct value of the branching fraction has beentheoretically predicted in the Standard Model as (3.0 ±−110.3) × 10 .
In 2015, KOTO resumed the physics run and a data
set equal to twenty times that of the 2013 measurements was recorded. After the beam time, new large
shower counters, named “Inner Barrel (IB)” (Fig. 1), andbuilt at the KEK Tsukuba campus, were successfully

Fig. 1. Cross-sectional view of the new Inner Barrel shower
counters shortly after its fabrication at KEK Tsukuba.

J-PARC Annual Report 2015

Particle and Nuclear Physics

23
installed in the KOTO detector at the end of March. The
new IB counters will improve the photon detection
capability of the KOTO detector and further reduce thebackgrounds to the rare decay.
The E36 experiment is designed to measure thedecay of a charged kaon into a positron and a neu−5trino. This decay occurs with the branching ratio at 10 .
+Measurement of the ratio of the decay widths of K →+++e ν and K → μ ν at the precision level of 0.2% would

be a stringent test of the lepton universality. The experiment E36 collected data in 2015 and accumulated data++
corresponding to 40 k K → e ν events. A search for+++ −“Dark photon (A’)” with K → μ νA’ and A’ → e e will
also be conducted using that data. After the experiment was completed, the K1.1BR beam line and area
were dismantled for the construction of the COMET and
the High-p beam lines.

Muon Experiments
The goal of COMET collaboration is to search forthe muon-to-electron conversion at a sensitivity of bet-14
ter than 10 in the first phase of its experiment. Many
aspects of the R&D, such as the construction and testing in vacuum of a real-size prototype of the Straw Tube
tracker, were carried out in 2015. Its performance test
was conducted using an electron beam above 100 MeV
together with a prototype of the LYSO crystal calorimeter to demonstrate their combined performance (Fig. 1).
The new experiment for measurement of the muon
anomalous magnetic moment (g-2) and electric-dipole
moment (EDM) has made advances in all of its areas.
A low-energy muon source and a muon beam profile
monitor were successfully tested at the muon beamline
in the Materials and Life Science Experimental Facility(MLF) of J-PARC. A low-energy electron beam and amini solenoid magnet were prepared to demonstrate

the spiral injection of the beam to the magnetic field.

Fig. 1. Electron beam test of the Straw-Tube tracker and the
LYSO calorimeter prototypes.

JSNS2 (J-PARC E56) Experiment
JSNS2 (J-PARC Sterile Neutrino Search at J-PARC
Spallation Neutron Source) is a new stage-1-approved
experiment, which aims to confirm or refute the existence of the sterile neutrino [1]. After the approval of
the stage-1 status,significant efforts were applied tostart the experiment [2-4]. Here we briefly explain thespecifics of those efforts.
Figure 1 shows a bird’s-eye view of the MLF build2
ing and proposed JSNS detector location, which is thethird floor of the MLF. We have extensively discussed
the potential problems with the detector location withregards to the safety, the withstand-load and sinkageof the building, the Fire Code, and the interference2
between maintenance works and JSNS measurement [3]. There are no show stoppers so far.
The R&D for the detector, especially for the liquid
scintillator, are in good shape. The liquid scintillator2
used in the JSNS should distinguish efficiently the positron signal from the fast neutron background events(e.g., 90% detection efficiency of the signal with 1% efficiency of the background). We plan to use “Pulse ShapeDiscrimination (PSD)”, which uses the difference of thetails fraction of the scintillation light yield between signal and background, “and/or” cherenkov light, which isParticle and Nuclear Physics

J-PARC Annual Report 201524
emitted by the signal but not by the background [2-4].
We successfully measured the PSD capability usinga small setup and Cf source at Tohoku University [2,3]2
and the capability of the real JSNS detector was estimated by the MC simulation using the extrapolationfrom that small setup. We also measured the Cherenkov
capability using another small setup at KEK [2-4], andfound that the concrete scintillator cocktail recipe (LAB
+ 0.5 g/L PPO) can include both PSD and Cherenkov
methods at the same time. These significant findings
2will be used in the JSNS detector.
2
We intend to start the JSNS experiment at the
beginning of JFY2019 because the grant-in-aid(kiban(S)) was approved by JSPS for JFY2016. To start
the experiment, not only R&D works but also otherdetector design works will be described in the Technical
Design Report, which will be submitted at the beginning of 2017.

Fig. 1. A bird’s-eye view of the MLF building and the pro-

posed detector location (red box).

References[1] M. Harada et al, arXiv:1310.1437.
[2] M. Harada et al, arXiv:1507.07076.
[3] M. Harada et al, arXiv:1601.01046.
[4] M. Harada et al, arXiv:1610.0818.

Highlights-1: First Antineutrino Oscillation Results from T2K
The neutrino mass is zero in the standard modelof particle physics. However, in 1998, the SuperKamiokande (SK) experiment revealed that neutrinos
indeed have a finite mass [1]. In the experiment, it wasobserved that the phenomenon of “neutrino oscillation”, in which muon neutrinos from the atmosphere
are reduced as a function of L/E, where L is the neutrino
travel length and E is the neutrino energy. It indicatesthat muon neutrinos can transform into other typesof neutrinos. According to the theoretical model, thedependence of L/E is a clear feature of neutrino oscillation. In 2015, Prof. Takaaki Kajita won the Nobel prize“for the discovery of neutrino oscillations, which showsthat neutrinos have mass”, sharing the award with Prof.
Arthur McDonald. Prof. Kajita’s work was performed on
the SK experiment.
Today, neutrino oscillation is a unique tool to assess
the nature of the neutrino mass. After the discovery, physicists throughout the world have performed intensive
studies of neutrino oscillation, in order to understand theorigin of the neutrino mass. In other words, within thelast 20 years, neutrino oscillation has become a standard

tool to expand physics beyond the standard model.
In 2014, T2K, the Tokai-to-Kamioka long baseline neutrino oscillation experiment, started a new measurementof antineutrino oscillation to search for a CP violationin the neutrino oscillation. CP stands for a combination
symmetry transformation with C, which transforms aparticle into an antiparticle, and P, which flips the signof the spatial coordinate. CP violation has been discovered in the quark sector (K and B meson experiments).
CP violation is one of the three Sakharov conditions ofour matter-dominant universe. However, the size of theCP violation in the quark sector is not enough to explain
the matter-dominant universe. If CP is not conserved inneutrino oscillations, it may indicate a significant hint forthe origin of our matter-dominant universe.
In 2013, T2K discovered a new type of neutrino
oscillation: muon neutrinos transforming into electron
neutrinos (the electron neutrino appearance) [2,3].
The discovery of electron neutrino appearance opens
new possibilities to study the CP violation in neutrino
oscillation.
T2K ran with a neutrino beam from 2010 to 2014.

J-PARC Annual Report 2015

Particle and Nuclear Physics

25
Using all neutrino data, T2K established the electron
neutrino appearance and precisely measured neutrino
oscillation parameters with muon neutrino disappearance [4,5]. For this discovery and their study of neutrino
oscillation, Prof. Koichiro Nishikawa and the T2K collaboration were awarded the Breakthrough Prize in 2015.
T2K is an accelerator-based neutrino oscillation
experiment. A high-intensity beam is produced at theJapan Proton Accelerator Research Complex (J-PARC)
at Tokai village, Ibaraki, Japan. The neutrino beam is
directed to the SK located 295 km away from J-PARC.
High-intensity protons from the J-PARC accelerator
strike a graphite target and produce charged pions andkaons. Neutrinos (antineutrinos) can be produced fromdecays of positive (negative) charged pions. Horn magnets [6] can select pions of either sign by flipping thecurrent direction.
T2K released its first antineutrino oscillation resultsin the summer of 2015, using data collected from May,
2014, to June, 2015. The beam power was 350 kW atthat time, while the latest power level is 420 kW (as ofMay, 2016).
In T2K’s far detector SK, 34 muon antineutrino candidate events were observed, while 103.6 ± 12.0 eventsare expected, if there are no antineutrino oscillations.
This result is consistent with the expected disappearance due to the muon antineutrino oscillation. Figure 1
shows the reconstructed energy distribution of thosecandidate events. Two parameters, describing the disappearance oscillation phenomenon, can be extracted
from the analysis. Figure 2 shows the best-fit values
and the 68% and 90% C.L. intervals of those oscillation parameters. T2K also compared these results with
the T2K muon neutrino disappearance results, and nodifference between neutrinos and antineutrinos wasfound [7].
Using data from the same period, T2K also foundthree electron antineutrino candidates at the far detector, while the expected number of background events(anything other than electron antineutrino appearance) is 1.6 ~ 1.7 events, which depends on otheroscillation parameters. Taking those statistical fluctuations into account, it is difficult to make any definitive
statement about the electron antineutrino appearance.
T2K expects more significant results in the near future,
after collecting more antineutrino data. Actually, T2K
has already doubled its antineutrino data statistics at
the time of this writing.
T2K plans to continue to take both neutrino andantineutrino data. T2K has already collected a total of 1.5

Fig. 1. Reconstructed energy distribution of muon antineutrino candidate events..

Fig. 2. T2K best-fit values and 68% and 90% C.L. intervals of
two oscillation parameters. A comparison with theneutrino results is also shown.

21
21
× 10 protons on target. The T2K goal is 7.8 × 10 protons on target but it is now being proposed to extend
21
the T2K running up to 20 × 10 protons on target. Using
all the proposed data, T2K has the sensitivity to possibly
discover CP violation in neutrino oscillations [8].

References[1] Super-Kamiokande Collaboration, Phys. Rev. Lett. 81, 1562
(1998).
[2] T2K collaboration, Phys. Rev. Lett. 107, 041801 (2011).
[3] T2K collaboration, Phys. Rev. Lett. 112, 061802 (2014).
[4] T2K collaboration, Phys. Rev. Lett. 112, 181801 (2014).
[5] T2K Collaboration, Phys. Rev. D91, 072010 (2015).
[6] T2K Collaboration, Nucl. Instrum. Meth. A789, 57 (2015).
[7] T2K collaboration, Phys. Rev. Lett. 116, 181801 (2016).
[8] T2K collaboration, Prog. Theor. Exp. Phys. 043C01 (2015).

Particle and Nuclear Physics

J-PARC Annual Report 201526

Highlights-2: Charge Symmetry Breaking in Hypernuclei:
Result from the Renovated Hadron Experimental Facility
Charge symmetry or charge independence is oneof the basic concepts in nuclear physics. In ordinary
nuclei composed of protons and neutrons, this symmetry holds well. However, a larger charge symmetry
breaking (CSB) was observed in hypernuclei by theexperiment carried out just after the restart of the beam
operation at the J-PARC Hadron Experimental Facility(HEF) on April 24.
HEF was shut down for about 2 years after theradiation incident that occurred on May 23, 2013, inorder to renovate the facility and make it safe from such
incidents or similar unexpected problems. A production target (T1) was installed in a sealed chamber withcirculating gas monitor system to check the radiation.
Air-tight shielding structure of the primary beamline
and controlled ventilation system were newly constructed in the Hadron Experimental Hall. Radiationlevel displays and evacuation announcement system(siren and flash lamps) were equipped at each secondary beamline area. The diagnostic and interlock systemof the beam operation was also reinforced. In addition
to the hardware renovation, the operation procedures
and rules were strictly defined in the manuals.
After the new operation scheme was completed, atest operation started on April 9 in order to check thewhole system, including the newly installed equipment. Proton beam with 3 kW power was extracted
from the Main Ring (MR) to the Hadron Hall with defocus and bump orbit mode not to hit T1 in the night ofApril 9. On the next day, the beam was injected into T1
with focus and straight orbit mode for the first time. In
each step of the beam power increase, the target system, monitor and interlock system were confirmed towork properly. The facility was inspected for granting

Fig. 1. Photograph to commemorate the restart of the user
operation at J-PARC HEF.

a license on April 17, while a 12-kW beam was being
used. The certificate was issued on April 20. Finally, theuser operation restarted with a 24-kW beam on April 24.
Nuclear force based on strong interaction andnuclear system are invariant under exchange of protons
and neutrons (charge symmetry) or more generally
under any rotation in isospin space (charge independence). This approximate but basic symmetry holds
almost exactly in nucleon - nucleon (N-N) interaction
and ordinary nuclei. For example, binding energy difference of 70 keV in charge symmetric nuclei (called
3
3
mirror nuclei), H and He, and scattering length difference of proton-proton (pp) and neutron-neutron (nn)of app − ann = -1.5 ± 0.5 fm (both corrected for large
electro-magnetic effects) are very small and are theo0
retically explained by r - w mixing in meson-exchange
models [1].
On the other hand, in the hypernuclei by addinga L hyperon to the ordinary nuclei, there has been along-standing puzzle in CSB for the L-N Reported CSB
effects are relatively large and are not yet theoreticallyexplained. L binding energies of mirror hypernuclei,
44
LH and LHe obtained by emulsion experiments, are
2.04 ± 0.04 MeV and 2.39 ± 0.03 MeV, respectively [2],giving a large difference of 0.35 ± 0.05 MeV, as shown+++in Fig. 2. The excitation energy of 1 state or 1 - 0 level44spacing of LH and LHe measured by the transition
g-ray provides more information about the CSB effects.
4
The LH g-ray was measured three times [3-5], and its
average weight was 1.09 ± 0.02 MeV as shown in Fig. 2
4(on the left). On the other hand, LHe g-ray was reported

Fig. 2. Level schemes of mirror hypernuclei, 4ΛH and 4ΛH,
constructed by past emulsion experiments and γ-ray
4measurements. J-PARC E13 updated the level of ΛH, as
indicated in red.

J-PARC Annual Report 2015

Particle and Nuclear Physics

27
only once to be 1.15 ± 0.15 MeV [4] (Fig. 2 right side inblack arrow). This result also indicates a large CSB effect.
4
However, the LHe g-ray spectra were statistically insuf4
ficient and the identification of the LHe seems to be
ambiguous.
In order to resolve the puzzle and to confirm and++4
improve the data on the 1 - 0 level spacing of LHe,
J-PARC E13 was carried out at the K1.8 beamline of HEF(Fig. 3) in April, 2015, just after the restart of the user+
4
operation of the HEF. The 1 states of LHe were pro- 4
duced using the (K ,p ) reaction on a liquid He target
by measuring beam K and outgoing p with beam and
SKS spectrometers, respectively. The beam momentumof 1.5 GeV/c was chosen so as to maximize the yields+
4of the 1 state of LHe in the available beam condition.
g-rays were measured in coincidence by a newly developed Hyperball-J, which consisted of 27 Ge-detectors
in total, equipped with PWO counters.

-

Fig. 3. Photograph of the experimental setup. Outgoing πwere measured by SKS spectrometer and the produc4
4tion of ΛHe was tagged. γ-ray from ΛHe was measured
by Hyperball-J in coincidence.

++

A peak, contributed from both 0 and 1 states of
4
LHe, is seen in the missing-mass spectrum as shownin Fig. 4 on the left. In the g-ray spectrum obtained by
selecting events in the L bound-region, a peak was
clearly observed, as shown in the Figure on the right.
By taking the recoil effect into consideration, the++1 - 0 level spacing was unambiguously determined
stat.
syst.
to be 1.406 ± 0.002 ± 0.002 MeV in the present
measurement.
4This value of LHe is obviously larger than that of4
LH. The present result clearly indicates the existenceof CSB in the LN interaction. Combined with the past+emulsion data, the L binding energy of the 1 state of4
LHe is 0.98 ± 0.03 MeV. Comparing the present updated++
energy and the reported one for the 1 /0 states of+the mirror hypernuclei, the difference of the 1 states+of 0.03 ± 0.05 MeV is much smaller than that of the 0states of 0.35 ± 0.05 MeV. Therefore, the CSB effect isstrongly spin-dependent. This fact may provide a key tosolving the puzzle of the large CSB in hypernuclei andthe underlying LN interaction.
The present result was published in Physical Review
Letters, being selected as Editor’s Suggestion [6]. The
result was also covered in a press release of Tohoku
University, KEK, JAEA and J-PARC Center on November
25 [7]. Further confirmation and improvement of theexperimental data were carried out or planned in orderto clarify the CSB effects in hypneruclei. The p momen44
tum in the LH → He + p weak decay was precisely
measured at MANI-C [8]. The obtained L binding
4
+
stat.
syst.
energy of the LHe 0 state was 2.12 ± 0.01 ± 0.09
MeV, consistent with the emulsion data. A new proposal has been submitted to J-PARC to measure g-ray of
4++
the LH 1 → 0 transition by Hyperball-J in coincidence
4
7- with LH being produced as a fragment of the Li(K ,p )reaction [9].

Fig. 4. (Left) Missing mass spectrum of the 4He (K -π -) reaction. The peak shows the production of bound states of 4ΛHe (black), while
no peak exists in the empty target run (blue). (Right) γ-ray energy spectrum obtained by selecting events in the bound regionof the left spectrum.

Particle and Nuclear Physics

J-PARC Annual Report 2015

28
References[6] T. O. Yamamoto et al., Phys. Rev. Lett. 115, 222501 (2015).

[1] G. Miller, A. Opper, E. Stephenson, Ann. Rev. Nucl. Part. Sci. 56,[7] KEK Press release on November 25,2015 (in Japanese)

253-292 (2006).

http://www.kek.jp/ja/NewsRoom/Release/20151125150000/[2] M. Juric et al., Nucl. Phys. B52, 1 (1973).

[8] A. Esser et al. Phys. Rev. Lett. 114, 232501 (2015).

[3] M. Bedjidian et al., Phys. Lett. 62B, 467 (1976).

[9] Proposal for J-PARC 30 GeV Proton Synchrotron P63,

[4] M.Bedjidian et al., Phys. Lett. 83B, 252 (1979).

http://www.j-parc.jp/researcher/Hadron/en/pac_1601/pdf/[5] A. Kawachi, Ph.D thesis, University of Tokyo, 1997.

P63_2016-2.pdf

Cryogenics Section

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 for theconstruction and operation of superconducting magnet systems for the muon beamline at the Materials andLife Science Experimental Facility (MLF) and the magnet systems at the Hadron Experimental Facility (HEF).
It also actively conducts R&D works for future projects
at J-PARC.

Cryogenics Section

J-PARC Annual Report 201530

Cryogen Supply and Technical Support












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



$SU
0D\
-XQ
-XO
$XJ
6HS
2FW
1RY
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)HE
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

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


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



Fig. 1. Liquid helium supply at J-PARC from April, 2015, to
March, 2016.



2WKHUV&U\R6+DGURQ
0/)
5DG6&XPXO

$SU
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&U\R6+() 6.60/) PXRQ
0/) QHXWURQ&XPXO

Cumultive Supply (L)Liquid nitrogen was also supplied to the users fortheir convenience. Its amount in FY2015 is summarized
in Fig. 2. Liquid nitrogen has been regularly provided
to the Radiation Safety Section for operation of a gas
chromatograph. Liquid nitrogen was also supplied tothe users in MLF and HEF.

Cumultive Supply (L)The Cryogenics Section provides liquid helium
cryogen for physics experiments at J-PARC. The usedhelium is recycled by the helium gas recovery facility, which is provided and operated by the Cryogenics
Section. Fig. 1 summarizes the liquid helium supply in
FY 2015.

Fig. 2. Liquid nitrogen supply at J-PARC from April, 2015, to
March, 2016.

Superconducting Magnet System for T2K
The superconducting magnet system operated
during periods shown in Table 1. In June, 2015 thecryogenic system operation stopped as the T2K beamtime was over, and the whole magnets were warmed
up to room temperature in July to exchange three
beam monitors, which were installed at interconnections between the magnets. Then, in November, thesystem briefly operated to confirm the beam monitor
performance at low temperature of 4.5 K. From January,

the system operated for physics data taking. During
the operation, two control valves were found to haveproblems, as their positioners didn’t work properly.
The positioners were replaced with spare ones, and thevalves successfully recovered their functions without
losing T2K beam time. These troubles indicate aging
degradation in the devices after an eight-year operation. The cryogenic system was operated for 3818 hours
in FY2015, as summarized in Fig. 3.

Table 1. Operation history of the T2K superconducting magnet system.

2015
Apr.

May

1/5 4/14

5/1 - 6/22-7/2
6/4 (Warm up)

June

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

2016
Jan.

Feb.

Mar.

Operaon

Maintenance

10/21-11/18(Beam monitor check)

1/18-5/28

J-PARC Annual Report 2015

Cryogenics Section

31

7000
Time (Hours)

6000
5000

Compressor Operation
Magnet Excitation

4000
3000
2000
1000
0

FY2009FY2010FY2011FY2012FY2013

FY2014FY2015

Fig. 3. Annual operation time of the cryogenic system for the J-PARC neutrino beamline.

Superconducting Magnet Systems at MLF
The Cryogenic Section contributes to the superconducting magnet systems at the Muon Science Facility(MUSE) in MLF. The 6-m long superconducting solenoid
in the Decay Muon Line (D-line) was replaced with a
new one, as shown in Fig. 4. It has a 20-cm warm bore
and there is no thermal shield at both ends to transporta larger number of muons. After the installation work
finished, the solenoid was cooled down by a D-line
refrigerator and successfully charged up to a nominal
field of 3.5 T. The Cryogenics Section also helps withthe operation of a set of superconducting magnets in
the Ultra-slow Muon Line (U-line). The magnets worked
well in FY2015 and contributed to developing an ultraslow muon production.

Fig. 4. A new superconducting solenoid with a warm bore for
the MUSE D-line.

Superconducting Magnet Systems at HEF
Superconducting Kaon SpectrometerTh e Cr yo g e n i c s S e c t i o n s u p p o r t s t h eSuperconducting Kaon Spectrometer (SKS) operation
at the Hadron Experimental Hall. The SKS was operated
until mid-November, 2015, for physics data taking. After
warming up, the SKS was transferred to the other beamline, K1.1, to prepare for the next experiment.
Superconducting Magnet System for E36
The TREK/E36 experiment for the measurement of
lepton flavor universality violation was performed at
the K1.1-BR beamline in the Hadron Experimental Hall.
The superconducting toroidal magnet and a helium
cold box (Linde TCF50), that were operated in the KEKE246 experiment in 1990, were reused in this project.

The cryogenic system had several serious problems,such as leakage of the 4 K helium pipe and control system. The Cryogenics Section conducted repair works,
and completed the system construction in the Hadron
Experimental Hall at the beginning of FY2015. Then,cool down, excitation and quench test were performed
to evaluate the system reliability. The precooling time
was approximately 2 days, which was consistent withthe trend obtained in the KEK-E246 experiment. The
cryogenic system was steadily operated without any
troubles even in the full current quench test. After the
prefectural government completed its inspection, thesystem was operated for a long time and steadily controlled until the E36 experiment finished, except for the
maintenance working period.

Cryogenics Section

J-PARC Annual Report 2015

32
COMET Superconducting Magnet System
The COMET Phase-I experiment is under construction in the Hadron South Experimental Hall (HDS). The
Cryogenics Section was involved in the construction ofcryogenic system and superconducting magnets. The
cold box and the helium screw compressor used in
the E36 experiment will be used again for the COMET
experiment. After finishing the E36 experiment, thecold box and its control system were transferred from
K1.1BR into HDS. Figure 5 shows the removal work of
the cold box from the K1.1-BR area. High-pressure
gas lines for the cryogenic system were partially constructed connecting the compressor hat to HDS at theend of FY2016.
The power supply and the current leads for the
Muon Transport Solenoid were delivered to the experimental hall in FY2015. The design work for the heliumtransfer lines to the magnets and also details in thePion Capture Solenoid have been improved by the
Cryogenics Section.

Fig. 5. Removal work of the cold box used for E36 at K1.1BR in
HEF.

R&D for the Future Projects at J-PARC
The g-2/EDM project aims for the precise measurement of the anomalous magnetic moment and theelectric dipole moment of muons. This experiment was
proposed at the MUSE H-Line. A superconducting solenoid with high field homogeneity, better than 1 ppm
locally, plays a very important role as a muon storage
ring. The design study of the magnet is proceeding incollaboration with IPNS and the Cryogenics Science
Center. A technical design report was submitted in May,
2015.
A muonium hyperfine structure measurement,
called MuSEUM experiment, is proposed at the same
beam line as the g-2/EDM project. In the experiment,
the energy state transition in muonium will be observed
under a static magnetic field with local homogeneity of 1 ppm. A standard NMR probe to determine theabsolute magnetic field is being developed to calibrateother probes. The probe has been designed carefully,
so that the material effect that causes the error fieldwould be minimized. It was cross-calibrated using the
MRI magnet at the Argonne National Laboratory (ANL)with a standard probe of pulse NMR probe, which wasdeveloped by the University of Massachusetts group,
as shown in Fig. 6. The difference between the probes
was measured to be about 44.16 ppb. The cause of thedifference is being investigated, and the next test isplanned for the beginning of 2017.

Fig. 6. The standard probe developed in KEK, tested with the
MRI magnet at ANL.

Information System

Network and Computing
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 andoperational policy. In 2015, the total number of hosts
on JLAN exceeded 4,504, which was a 110% increase,
compared to the last year. The growth curve of edge
switches, wireless LAN access points and hosts (servers
and PCs) connected to JLAN is shown in Fig. 1.
Figures 2 and 3 show the network utilization of
the internet 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

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

Information System

J-PARC Annual Report 201534
through the internet, but it has 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
for data analysis are located. Figures 4 and 5 show thestatistics of data transfer between the two sites. The
bandwidth capacity for the connection is currently
1 Gbit/s × 8 = 8 Gbit/s and this year, the usage levelhas been approaching half of it in 5 minutes averagerate. The data traffic dropped after the J-PARC temporary shut-down, following the incident at the Hadron
Experimental Facility on May 23 and has recovered after
the Facility’s operation restarted (Fig. 6).

to internet

1
2 hour average

0.8
0.6
0.4

0.8

2hour average

5 min. average

0.6
0.4
0.2

0.2
0

0

Apr-15 May-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16 Feb-16

Apr-15 May-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16 Feb-16

month-year

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

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

5

Tsukuba to Tokai

1.2

2 hour average

12 hour avarage

5 min. avarage

0.6

5 min. avarage

4

GBPS

0.8

0.4
0.2

3
2
1

0

0

Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16 Feb-16 Mar-16

Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16 Feb-16 Mar-16

Fig. 4. Network traffic from Tsukuba to Tokai.

Fig. 5. Network traffic from Tokai to Tsukuba.

7
Tokai→Tsukuba

6

200

GWLAN

5

Summed connection

from internet

Gbit/s

GBPS

from internet

1

5 min. average

GBPS

GBPS

GWLAN and User LAN for J-PARC Visitors
J-PARC offers two types of internet connection service for visitors, GWLAN and User LAN. The GWLAN is awireless LAN internet connection service for short-term
visitors available in almost all J-PARC buildings. Before
using the GWLAN, users are required to receive a password at the J-PARC Users Office. On the other hand, theUser LAN is dedicated to the J-PARC facility’s public users.
Since in the User LAN service users are authenticated by
the same ID and password of the User Support System,
which is also used for dormitory reservation or so on,they can easily start and use the internet service. Figure 7
shows the usage statistics of GWLAN and User LAN.

To internet

4
3
2

User LAN

150
100
50
0

1
0
2010

2011

2012

2013

2014

2015

month-year

FY

Fig. 6. Transitive graph of network traffics.

Fig. 7. GWLAN and User LAN utilization.

J-PARC Annual Report 2015

Information System

35
Statistics of Computing
Though J-PARC does not have its own central computing system for physics analysis, since 2009, the KEK
central computer system at the KEK Tsukuba site has
been mainly used for that purpose. Currently computer resources of 25,000 SPECint06 computing power,
1.2 PBytes disks and 5 PBytes tapes have been assigned
to J-PARC (Table 1).
In the Neutrino (T2K experiment) and Hadron experiments, the data taken in the J-PARC experimental hall will
be temporarily saved at the Tokai site and then promptlytransferred to, stored and analyzed at the system in
Tsukuba. The storage of the system will also be utilized asa permanent data archive for the Neutrino, Hadron and
MLF experiments. Figures 8, 9 and 11 show the utilization
statistics of the computer resources in 2015. The mainusers, who used the CPU and the storage constantly,
were a Koto experiment group at the Hadron Facility andthis year, they increased intensively the amount of theirdata . In contrast, the neutrino and MLF group have been
accumulating data steadily (Fig. 10 and 11).

CPU Utilization

100

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

25,000 SPECint06

RAID Disk

1,200 TB

Tape

5.0 PB

60

%

CPU

80

40
20
0

Apr-15 May-15 Jun-15

Jul-15Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16

Feb-16 Mar-16

month-year

Fig. 8. CPU utilization by J-PARC groups.
Disk System Utilization

1.2

1.4

1.0

1.2

0.8

1.0

0.6

0.8

PBytes

PBytes

1.4

0.4

0.6

0.2

0.4

0.0

0.2
0.0
J-PARC Hadron
J-PARC Neutrino
J-PARC MLF

2011

2.5

2.0

2.0

PBytes

PBytes

2015

3.0

2.5

1.5

1.0

1.0

0.5

0.5

0.0

0.0

Fig. 11. Tape utilization.

2014

Fig. 10. Annual transition of disk utilization.

Tape Utilization

1.5

2013

FY

Fig. 9. Disk utilization.

3.0

2012

2011

2012

2013

FY

2014

2015

Fig. 12. Annual transition of tape utilization.

Transmutation Studies

Overview
We have been working on developing theTransmutation Experimental Facility (TEF) in J-PARC
for R&D on volume reduction and mitigation ofharmfulness of high-level radioactive waste by using
accelerator-driven systems (ADS). To reinforce the organizational structure for accelerating the facility design
and related R&D activities, the Nuclear Transmutation
Section was moved up to the Nuclear Transmutation
Division on April 1, 2015. In addition, two new sections, the Target Technology Development Section andthe Facility and Application Development Section werecreated under the Division on October 1, 2015. About
ten new members joined the staff in JFY 2015, althoughmost of them also had another job.

This year, the design of the ADS Target Test Facility(TEF-T) made significant progress. The primary loop
for the lead-bismuth eutectic (LBE) target system
was designed in detail. The facility building was also

Fig. 1. Bird’s-eye view of TEF-T.

Transmutation Studies

J-PARC Annual Report 201538
detailed with planning the layout of the target and theassociated systems, as well as every ancillary facility, tocreate 3-D bird’s-eye views of the whole TEF-T (Fig. 1).
To evaluate whether the TEF construction site was suitable for construction of a nuclear reactor facility, theTransmutation Physics Experimental Facility (TEF-P), a
ground survey of the site was conducted.
The following R&D activities to support the TEF program also advanced. Their details will be described in
the sections that follow.
• Oxygen sensor fabrication and testing• Success in the long-term operation test of an ultrasonic LBE flow meter• Remote-handling test for the LBE target replacement• Testing of a freeze-seal valve• Cladding tube burst experiment for TEF-P• Testing of laser charge exchange techniquethth
In August, 2015, the 8 and 9 meetings of the
National Review Working Party (WP) for Partitioning
and Transmutation Technologies using ADS were held.
The WP discussed the progress in solving the technicalissues in the TEF construction, international cooperation, human resource development, and so on. The WP

evaluation statement was: “The R&D activity is goingwell and further development in elemental technologies and improvement in experimental devices areneeded.”On October 28-29, 2015, the second TEF TechnicalAdvisory Committee (T-TAC), which was one of thetechnical advisory committees under the J-PARC
International Advisory Committee, was held (Fig. 2).
The director of J-PARC Center defined the goal of thisT-TAC as “to evaluate technical readiness for starting
detailed design and construction of TEF-T in JFY2017”. In
response, the T-TAC gave us the following encouraging
evaluation: “both systems (TEF-T & TEF-P) are outstanding
and unique in the world for the development of physical,
materials and engineering data for the design of largescale ADS,” and “given that the appropriate resources areavailable, the T-TAC members acknowledge the schedules
for the launch of the detailed design and construction of
TEF-T in FY2017.”
By devoting our best efforts to the further advancement of the TEF program, we hope to contribute to thedevelopment of the nuclear transmutation technology
with using ADS.

Fig. 2. T-TAC 2015 members and attendees.

1

TP: Tokyo Peil

J-PARC Annual Report 2015

Transmutation Studies

39

Design of the Transmutation Experimental Facility (TEF)
Precise Arrangement of the TEF Facility Layout
Based on the last year’s TEF layout study, the layout of the TEF-T and the TEF-P was arranged precisely(1)
without interfering with each other. Above TP 15 m,
the TEF-P should be surrounded by a multi-layered barrier. However, under TP 15 m, the multi-layered barrier
is not necessary. Therefore, the TEF-T were built along
the TEF-P’s fence as shown in Fig. 3(a), and under TP
15m, the TEF-T can be built under the TEF-P’s fence, as
shown in Fig. 3(b).

Fence for the Limited Acvess Area

Design of the TEF-T Facility
The target components and the other devices areheated by the proton beam. Also, the air in the target
station and the cover gas of the circulation systems areirradiated and include activated materials as a resultof the proton beam injection test. All these problems
make it necessary to use the component cooling system and the off-gas processing system. The electricalreceiving and transforming equipment is necessary tosupply electricity to the subsystems in the TEF-T. And
the proton beam tunnel, called L-TEF BT, is located in
the B2F of the TEF-T.

Fence for the Protected Area

TEF–P

TEF–T

TEF–P

(a) above TP 15m

TEF–T(b) under TP 15m

Fig. 3. The TEF layout for (a) above TP 15 m and (b) under TP
15 m.

Design of the TEF-T Floor Layout
In the TEF-T facility, a material irradiation test has
been planned, using the liquid lead-bismuth spallation target. In an effort to ensure effective utilizationof the TEF-T, some parts of the facility will be provided
to users for multiple purposes. The TEF-T floor layout isdesigned in accordance with the study of the experimental operation and the radiation control. The TEF-T
floor layout is shown in Fig. 4.
B2F Irradiated components
handling room

Multipurpose
use hallStudy of the Radiation Control
The wall thickness and the structure of the TEF-T
building were designed to comply with the radiation
analysis to prevent radiation exposure. Also, the pressure of the radiation controlled area is maintained
lower than the atmospheric pressure to prevent leakage of radioactive materials.

Target station

Neutronirradiation cell

Beamline to the TEF-P
In the TEF-P, 10-W proton beams extracted fromthe main beams will be used to perform various reactor physics experiments towards the R&D of the ADS.
In order to control the beam profile in conducting theexperiments, and to shut down the reactor core powersafely in case of unexpected accidents, it is necessary todevelop dedicated equipment, such as a beam dump,a collimator, and a beam shutter, paying attention toradiation damage and shielding. To achieve these aims,
the concepts of the equipment and shielding structure
have been studied. Figure 5 shows a schematic view ofthe beam line from the TEF-T to the TEF-P. The future
work will focus on the installation and maintenance ofthe equipment.

L-TEF BT beam tunnel

L-TEFBTbeam magnet cooling system/hot area air
conditioning components romm

Fig. 4. The TEF-T floor layout of B2F.

R&D of a Proton Beam Monitor for the TEF Facilities
In order to irradiate the beam safely to the target
placed at the TEF-T facility, observation of the beam at
the target by a monitor designed specifically for thatprofile is essential. Since the TEF-T is designed to irradi2
ate with a high peak current density, such as 20 µΑ/cm ,which is the equivalent value of the ADS system plannedin JAEA and is about 6 times higher than the present
spallation neutron source in the J-PARC, a new technology for building the profile monitor is needed
to ensure that the sensor of the monitor has a highTransmutation Studies

J-PARC Annual Report 201540

Concrete
Iron
Soil
To TEF-P

10 W dump
400 MeV – 10W
From TEF-T

Fig. 5. Beamline from the TEF-T to TEF-P.

radiation resistance. New monitors have been developed to observe the beam profile. The beam profile
can be obtained by observing the thermal distribution
image at the target or window. Since the radiation doseis extremely high around the target, a monitor withhigh radiation resistance is required and a camera forthermal image cannot be placed near the target, whichmakes it necessary to use an image transport system.
To satisfy this requirement, an infrared image transfer system was developed with bundled hollow-core
fibers with a length of 1 m. As an examination of thesystem, the thermal distribution of the ceramic heater
was observed by the infrared system. The result of thethermal image is shown in Fig. 6. A clear image of theceramic heater was obtained.
Ground Survey for the TEF-P Planning-Construction
Site
The TEF-P is a part of the TEF, which is located at
an experimental zero-power nuclear reactor. After the
Fukushima Accident, the safety regulations for experimental reactors have been greatly strengthened, tothe level of those for nuclear power reactors. Therefore,
an adequacy assessment for construction of a nuclear
reactor in a planned-construction site of the TEF was
conducted to determine the compliance with the new
regulatory standards. Because the TEF-P uses very lowpower proton beam for neutronic experiments, it isFig. 6. Thermal image obtained with infrared bundled hollow-core fibers with 12 by 12 channels for profile monitor at the TEF-T.

necessary to locate an adjacent ADS Target Test Facility(TEF-T), which accepts almost all beams from the J-PARC
Linac. An in-depth investigation of the whole plannedconstruction site including the TEF-T was required,ground survey of the reactor location point and thereactor building was performed, as a first step.
Four points, including the reactor location, wereselected for this survey. The point of the reactor location was surveyed at about 400 m underground andthe others were done at around 40 m underground tocompare the data taken for other existing nuclear reactor facilities in JAEA. The ground characteristics were
measured by borehole logging and ground properties
were acquired in all borehole points.
As a result of this survey, it is estimated that aplanned-construction site has a free bedrock surface at
344 m underground, and the surface has no significant
height differences and weathering. This result confirmed that the distribution of tuff repository aroundthe planned-construction site is matched with the dataof existing reactor facilities in JAEA. Thus, it was concluded that there were no active fault lines under the
TEF-P site and this site complied with the new safety
standards for building experimental reactor facilities.
As a next step, further in-depth ground survey will
be performed including confirmation of the case that
the TEF-T does not influence negatively the safety of theexperimental reactor.

J-PARC Annual Report 2015

Transmutation Studies

41

R&D for the TEF-T
Studies to Construct the TEF-T
The experimental studies for LBE handling to construct TEF-T have been progressing. For the study oftarget materials, modification of the OLLOCHI (Oxygencontrolled LBE LOop Corrosion tests in HIgh-temperature)
was finished by the end of March, 2016, and a conditioning operation without LBE has been started.
For the study of the components and theirfunctions, operation of the IMMORTAL (Integrated Multifunctional MOckup for TEF-T Real-scale TArget Loop)
has been started in 2015. For the study of instruments,
the developments of oxygen sensors and an ultrasonicflow meter have been started as key instrumentation
technologies for the LBE loop system. For the studyof remote handling techniques, remote cutting/welding techniques to connect the TEF-T target have been
advancing. For the study of the components, functional
tests of the freeze-seal valve have been performed byusing a test-stand for fundamental LBE technology. The
results of these tests will be described in detail below.
Development of an Oxygen Sensor for LBE
In 2014, J-PARC tried to fabricate an oxygen sensor, which was a Pt/air type sensor. As a result, it was
confirmed that the output voltage of the sensor was
adequate within a wide temperature range. On theother hand, it is known that there is a possibility of LBE
leakage, if the sensor fails. To prevent the LBE leakage, afreeze-seal design was employed in the housing of theoxygen sensor. To confirm the feasibility of the freezeseal concept, an experiment was performed under realconditions. In this experiment, housing was prepared,
LBE was put under certain pressure and the LBE leakage was checked. The LBE temperature was 450°C in allcases. Table 1 summarizes the experimental results. The
TEF-T loop was designed so that the maximum pressure
was 0.3 MPa and the pressure during the operation was
0.1 MPa. Through the experiments, it was confirmedthat there was no LBE leakage, even under pressure of
0.5 MPa. The result meant that the freeze-seal design
Table 1. Experimental results for freeze-seal design.

Case
Pressure to LBE [kPa]
Pressurization time [min]LBE leakage
Weight (before break) [g]Weight (after break) [g]

A
206.0
8
No
239
243

B
306.8
13
No
240
273

C
520.0
10
No
239
268

could be used in the TEF-T loop.
R&D of Flow Monitoring System for the TEF-T Target
Flow monitoring system of the coolant is one of
the essential components of the safety measures for
the LBE spallation target in the TEF-T. The electromagnetic flowmeter (EMF) is usually used as a liquid metal
flowmeter in a high-temperature condition. LBE has
the corrosiveness for materials. Therefore, the degradation of electrode was frequently observed in long-term
experiments up to 3,000 hrs, resulting in signal instability of EMF, which was caused by the adhesion of
impurities/deposits. The objective of this issue is todevelop a long and a reliable flowmeter for the LBE
target system. We focused on the ultrasonic techniqueand developed a flowmeter to achieve both long-termand high-reliability flow monitoring for the LBE target
system in the TEF-T.
Figure 7 shows the results of the durability test of
the developed flowmeter under flowing LBE condition. The LBE temperature was set to 350°C. During theexperiment, the developed system provided enoughsignal amplitude to measure the flowrate, and the measured velocity data showed sufficiently sTable output.
We proved successfully that the developed flowmeter
was performing effectively over a long period of time.
We performed the application test in loop restart condition with two interruption followed by two restarts.
The signal decrease was 7% in after the first restart an
13% after the second restart. We concluded that thecause for the signal decrease could be the degradationof the solid-liquid boundary condition due to adhesionof impurity materials. However, the decreased signal
almost recovered to the maximum value of 1,700 hrs.
later under flowing LBE condition. Furthermore, therequired signal amplitude of developed flowmeter is
too small, hence there is no problem with such kind of
decreased signal condition.
Remote Handling Techniques for the LBE System
The LBE target system is installed under high radioactive environment, hence all components should bemaintained by remote handling. Specifically, the LBE
target vessel requires scheduled exchange because of
its limited lifetime and to get a sufficient dose of irradiation samples. We planned to replace the target vessel byusing the same type of remote handling flange that was
installed at MLF. However, burnup/fixing of bolts wasTransmutation Studies

J-PARC Annual Report 2015

42
Measured velocity [m/sec]
Estimated setting velocity (EMf/EMP) [m/sec]
Signal amplitude

0.50

1.2

Velocity [m/sec]

0.8

0.30

0.6
0.20

0.4

0.10
0.00

Signal Amplitude P [-]

1

0.40

0.2

0

1000

2000

3000

4000

0
6000

5000

Time [hrs]Fig. 7. Experimental results of the durability test.

Fig. 9. Photo of the setup of the welding machine.
Cooling Water Circuration

Exp.Tank
Temp

200°C

〜250°C〜300°C〜350°C〜400°C450.00400.00350.00300.00

TL1
TL2

250.00

TL3
TL4

200.00

TL5

150.00

TL6
TL7

100.00

TL8

19:55:00

19:45:00

19:35:00

19:25:00

19:15:00

19:05:00

18:55:00

18:45:00

18:35:00

18:25:00

18:15:00

18:05:00

17:55:00

17:45:00

17:35:00

17:25:00

17:15:00

17:05:00

16:55:00

16:45:00

16:35:00

16:25:00

16:15:00

16:05:00

15:55:00

15:45:00

15:35:00

15:25:00

15:15:00

15:05:00

14:55:00

0.00

14:45:00

50.00

14:35:00

Development of the Freeze-Seal Valve
When the LBE loop operates for a long time, it produces Pb-oxides that get wedged to the seal of themechanical valve. That causes a slow leakage of LBE, followed by decrease of the primary coolant, and finally,
the loss of coolant results in aborting the circuit. In thecase of Station Black Out, an automatic drain mechanism is desirable (it is not a legal recommendation), forthe sake of the safety not only for the public but also for
the workers. So, a freeze-seal valve (FV) has been considered as a drain valve. To confirm the performance ofFig. 8. Pipe cutting operation by MSM and the exterior of the
cut surface.

14:25:00

frequently observed when the temperature increased
up to 500°C, so we decided to apply the remote cutting/welding technique. The automatic welding machine is
a commercial product manufactured by Swagelok. At
first, we tried to perform the pipe cutting test and to set
up the welding machine by using a single MSM.
Figure 8 shows the pipe cutting operation andthe exterior of the cut surface. A modified pipe cutter was applied to decrease the machining dust underradioactive environment as much as possible. The cut
surface was sufficiently smooth for welding, and little ofmachining dust was observed. On the other hand, theorthogonal setup of the pipe cutter was too difficult,that is why now we are developing setup jigs.
Figure 9 shows the photo of the setup procedure of
an automatic welding machine. Its welding head was
put and fixed on a jack to adjust the height. As a result,it was confirmed that the setup of the welding machine
was possible by using a single MSM. An outstanding
issue is how to position accurately both welding pipes.
To overcome this problem, we will perform R&Ds in the
future.

Fig. 10. Temperature response of the water-cooled FV.

J-PARC Annual Report 2015

Transmutation Studies

43
FV, two types of FV with different coolants (water, air)
were tested.
The results show that the freezing times of the
air-cooled and water-cooled FV were 30 min and 2 – 3min, respectively. For the water-cooled FV, the melting

time with and without a heater were 10 min and 20
min, respectively. Considering the time response forfreezing, we selected the water-cooled type. As of theremaining issues, it will be necessary to conduct stresstests for thermal shock.

R&D for the TEF-P
The TEP-P Related Experiment
The TEF-P is a critical assembly and it will treat
minor actinide (MA) fuel in the reactor physics experiment. The temperature level, at which the air coolingof the TEF-P core would stop, was estimated but there
were no data to evaluate the soundness of the MA fuelpin. To set a tentative limit temperature for the TEF-P
core, a cladding tube burst experiment was performed.
PNC316 steel was employed in the experimentand two inner pressure conditions, which were basedon the inner pressures of the MA fuel pin within 30
and 50 years of fabrication, were adopted. As a result,the cladding tube burst occurred at 680°C as the most
severe case (Fig. 11). An estimate of the creep rupture
time was also performed. It was concluded that if thecladding tube temperature would be less than 600°C,
that will provide a buffer of about 100 days until thecreep rupture of the MA fuel pin when the air coolingof the TEF-P stops. Through these results, the tentative
limit temperature for the TEF-P core was set to 600°C.
Laser Charge Exchange Technique
For neutronics experiments using TEF-P, a low
reactor power of less than 1 kW is feasible to ensure
convenient experimental settings. To perform theexperiments at the TEF-P under such reactor power,with an effective neutron multiplication factor (keff)around 0.97, the incident proton beam power must bein the order of 10 W. It is also important to keep andreproduce the experimental condition, especially forthe injected proton beam. Because the J-PARC accelerators focus on much higher beam power, a highly
reliable low-power proton beam extraction device
is indispensable. The development of a laser charge
exchange technique for extraction of a low-power proton beam is now underway. The laser charge exchange
method (LCE) was developed originally to measure theproton beam profile and can be applied to the beam
separation device for the TEF-P. Figure 12 illustrates theconcept of the LCE device for the TEF-P.
The LCE device consists of a bright YAG-laser andlaser transport system with beam position controllers.
The negative proton (H ) beam from the J-PARC linac
is exposed by the YAG-laser beam, which can strip oneof the two electrons, so as to change H to neutral ones00(H ). The other electron of the H is finally stripped by+a carbon foil, so that positive protons (H ) are introduced into the TEF-P. We performed stability tests forlaser power and position under no H beam collisionand concluded that the LCE can be applicable at the

PNC316

Hoop Stress (MPa)

400
300
200

0.04°C/s
0.004°C/s

100

0.0004°C/s
0
600

700
800
Rupture Temp. (°C)

Fig. 11. Relation between hoop stress and rupture temperature.

900

Transmutation Studies

J-PARC Annual Report 2015

44
TEF-P beam source. From this fiscal year, we will conduct further tests with the H beam in cooperation with
the J-PARC accelerator division. As shown in Fig. 13, theLCE system is installed at the end of the 3-MeV linac
in J-PARC and is certified by the Nuclear Regulation
Authority of Japan. In future tests, data on the stability+of the H beam intensity will be obtained.
Ot
her
fac
ilit
y

H+ beam

TEFP

1
3

5

4

00 beam line

H0

5

H-

H

+

8

H- beam without H0 part
Bending Magnet

2

7

6

110 beam line

3

5
23 beam line
0Laser light

H- beam

Stripping foilBeam dump

J-PARC linac
H0 beam

Laser Source

H0* beam

Fig. 12. Conceptual diagram of the LCE device for the TEF-P.

Fig. 13. Schematic View of the LCE devices (1- quad-rupole
magnet, 2- bending magnet, 3- quartz viewing port, 4vacuum chamber, 5- beam dump, 6- stripping foil, 7beam position monitor, 8- slow current transformer).

Other activities and international collaboration
PIE Technology Developments
A series of post-irradiation examination (PIE) worksof the MEGAwatt Pilot Experiment (MEGAPIE) samples
has been progressing at JAEA’s hot-lab. The samples
were cut from the beam window (BW, material: T91)
and the flow guide tube (FGT, material: SS316L). The
total number of JAEA samples was 67 and all of themwere prepared without LBE.
To evaluate the fracture toughness of F/M steel
T91, testing techniques on SP (Small Punch) test andthree-point bending test have been developed. For the
SP test with ϕ2.4 mm steel ball, specimen preparation
techniques and test methods have been confirmed.
For the three-point bending test, test method without
notching specimen has been confirmed. These tests on
the irradiated specimens will be started in the next fiscal year at the WAste Safety Technology Engineering
Facility (WASTEF).

Meeting and Workshops
The first Asia ADS Topical Meeting was held at
J-PARC on October 26 and 27, focusing on the topic
of “lead-bismuth handling technology”. There werefour participants from Korea and one from China, andas the invited speaker, Professor Juergen Konys of the
Karlsruhe Institute of Technology (Germany) spoke on
the steel corrosion behavior of liquid lead-bismuth
and R&D on methods to suppress that behavior, developed in Germany. Later, there were presentations on
the R&D situations in Japan, China and Korea, and an
exchange of views on future R&D issues and cooperation to resolve them. After the meeting, the participants
toured test instruments, such as the liquid lead-bismuth
loop in the High Temperature Engineering Test Buildingof the Nuclear Science Research Institute. They asked
questions and exchanged views regarding the equipment and its operation.

Safety

1.	M ajor Events on Safety Culture and Safety
Activities in the J-PARC Center
The major events on safety culture and safety activities in J-PARC center are listed in Table 1. The FY2015
workshops for fostering safety culture at J-PARC andthe 3rd symposium on safety in accelerator facilities aredescribed in the chapter “Events”.
The Liaison Committee on Safety and Health forContractors Working at J-PARC was established to share
a common safety mindset and information concerning
safe work at J-PARC. The first meeting of the committee
was held on July 24, with 80 participants from 75 companies. At the meeting, there were reports on recent
accidents and troubles in the J-PARC, lessons learned
from those incidents, and precautions that must be
taken.

Table 1. List of major events on safety in FY2015.

Year

2015

2016

Date
May 23
July 24
Sep. 29
Nov. 6
Nov. 13Jan. 27-28
Mar. 30

EventsWorkshop for fostering safety culture
Meeting of the liaison committee on safety and health for contractors working at J-PARC
Refresher course on radiation safety
Safety audit
Emergency drill assuming radiation exposure accident
Symposium on safety in accelerator facilities
Meeting for exchange information on safety efforts

Safety

J-PARC Annual Report 201546
The J-PARC Safety Audit 2015 was conducted byoutside auditors (Prof. Takano of Keio University andProf. Ishibashi of Kyushu University) on November
6. They heard information about the current statusof safety management in J-PARC Center and various
efforts by the facilities, and interviewed the director, thedeputy directors, the managers of facilities and otherstaff members. They gave us valuable suggestions forthe future safety efforts, such as effective information exchange about the safety activities among thedivisions.
In order to exchange and share information on
safety efforts proceeding in each facility, a J-PARC Centermeeting was held on March 30. A variety of activities forsafety was reported by the accelerator facilities and thethree experimental facilities (the Hadron Experimental
Facility, the Neutrino Experimental Facility, and theMaterials and Life Science Experimental Facility). These
unique approaches, shared in the meeting, would be
effective in reconsidering safety activities at each facility, division, section, and group in J-PARC.
2. Emergency Drill
An emergency drill was held on November 13, incooperation with the Nuclear Science Research Instituteof the Japan Atomic Energy Agency. It was assumed thatthe beam operation was started without evacuating aworker in the accelerator tunnel of the Main Ring andhe suffered a neutron exposure of approximately 1 Gy.
The drill included initial measures taken by the staff inresponse to a variety of situations at the accident, suchas an estimating the exposure dose, transporting to a
medical facility by ambulance (simulated), and press
releases.
3. Radiological License Update
Application for an update of the radiological license
was submitted to the Nuclear Regulation Authority on
1
January 29 . The following major application items
were included:• Usage of a laser charge-conversion method on theaccelerator test stand in the Linac Facility• Addition to the license (handling and storage) of
sealed radioactive isotopes in the Materials & Life
Science Experimental Facility• Upgrade of the primary proton beam intensity of
the Neutrino Facility from 450 kW to 600 kW• Addition of storage facilities for induced radioactive materials and a waste storage facility in the
Hadron Experimental Facility.
In addition, we applied for installation of a newinterlock system related to the personnel access to thebeam tunnels after beam operation.

Emergency drill (the simulated ambulance)
1

We got an approval for the update application on April 18, 2016.

J-PARC Annual Report 2015

Safety47
4. Meeting and Committee on Radiation Matter
The basic radiation safety policy in J-PARC has been
discussed by the J-PARC Radiation Safety Committee(RSC), and we have discussed the specific contentsof the radiation safety in the J-PARC Radiation Safety
Review Committee (RSRC) on the basis of this policy.
The RSC was held twice and the RSRC was held
three times during the fiscal year. In the committees,
issues on radiological license upgrade were mainly
discussed.

4000

3000

2000

2015

2014

2013

2012

2011

2010

2009

2008

2007

0

2006

1000

2005

Number of Radiation Workers

5. Radiation Exposure of Radiation Workers
Figure 1 shows the variation of the number of radiation workers in J-PARC since 2005. In JFY 2015, 3026
individuals were registered as radiation workers in
J-PARC. Table 5 summarizes the distribution of annual
doses for each category of workers. The radiation
exposure of the workers has been monitored individually 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 105 persons (3.6% of the workers)
were detectable but less than 5.0 mSv.

5000

Fisical Year

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

Table 2. License at the end of fiscal year 2014 and application items for license in fiscal year 2015.

License at the end of fiscal year 2014

Application items for license in fiscal year
2015

Materials and Life Science
Experimental Facility

Power : 3 GeV/1 MW
Secondary beam lines (neutron) : 20
Secondary beam lines (muon) : 3

Power : 3 GeV/1 MW
Secondary beam lines (neutron) : 1

Hadron Experimental
Facility

Power : 30 GeV/50 kW
Secondary beam lines (meson) : 4

Neutrino facilities

Power : 30 GeV/450 kW

Power : 30 GeV/600 kW

Table 3. Radiation safety committee (RSC) in FY2015.

No.
23th
24th

Year
2015

Date

Major Discussion items

May 26

New interlock system
New category of controlled areas

Dec. 24

New interlock systemSafety

J-PARC Annual Report 2015

48

Table 4. Radiation safety review committee (RSRC) in FY2015.

No.

Year

Date

9th

2015

Apr.28New interlock system
New category of controlled areas
Other matters on license update

Oct.6

Revision of the operation manual on the conditions of "Alert Status" transfer
Revision of the safety rule of the X-ray instruments

Dec.18New interlock system
New category of controlled areas
Other matters on license update
Revision of the local radiation protection rule on the definition of J-PARC staff

10th

11th

Major Discussion items

Table 5. Annual doses in fiscal year 2015.

Dose range X (mSv)

Collective
dose(person-mSv)

Maximum
dose
(μSv)

UD

0.1 ≦ X ≦ 1.0

1.0 ＜ X ≦ 5.0

X >5.0Total
Workers

In-house staff

560

41

1

0

602

16.2

1.9

User

845

0

0

0

845

0.0

0.0

Contractor

1524

62

1

0

1587

19.2

1.1

Total

2921

103

2

0

3026

35.4

1.9

User Service

User Service

J-PARC Annual Report 2015

50

Users Office (UO)
Outline
J-PARC Users Office (UO) was established in 2007.
Since December, 2008, it has been located on the 1st
floor of the IBARAKI Quantum Beam Research Centerin Tokai-mura. The UO maintains the Tokai Dormitoryand provides on-site and web support with one-stop
service for the J-PARC Users. As of March 31, 2016, theUO employed 14 staffs and 4 Web Support SE staffs.
After the approval of their experiment, the J-PARC
Users follow the administrative procedures, outlined on
the Users Office (UO) web portal site, related to registration as a J-PARC User, radiation worker registration,
safety education, accommodation, invitation letter forvisa and other requirements. After that, the UO staffs
continue to provide support for them by e-mail. When
Users arrive at J-PARC, the UO assists them on-site withreceiving the J-PARC ID, personal dosimeter, and safety
education. In 2015, the UO took part in improving the
J-PARC on-line experiment system to make it moreuser-friendly. On-line safety education system wasintroduced in january 2016.

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Minami-ohta

TNiken-jaya
intersection

TOKAI
Smart ICJ PA
ATokai Village
OfficeJAEA Main Gate
(Central Security Office)[J-PARC]

Cocos
restaurant
62

PC depostore

Kakeagariintersection

Post Office

JR Tokai
StationTokai Hospital

Mobile phone
shop

Muramatsu
ShrineFire Station

Joban
Expressway

Magome-jujiro
intersection
349

Kasamatsu
Park

Ibaraki Higashi
National Hospital
245

Macdonald
Humbugger Shop
Lawson31

JR JobanLine

Naka-city Hall

3
2

Naka

Hitachinaka

Higashi MITO Expressway

2nd, left to right; SANAO Ai, ENOKI Kaori, NAMIKI Shinji, KATOGI Aki, ISOZAKI Mari, HANAWA Msahiro.
1st row, left to right KAWAKAMI Megumi, KIMURA Rie, SAKAGAMI Keiichi, ENDO Maya, HIGUCHI Yuko, ARIGA Asuko. KOBAYASHI Sayuri.

J-PARC Annual Report 2015

User Service

51

Activities of UO

J-PARC Users

Technical support

Technical contact
personResearch Proposal
Proposal Advisory
Committee

J-PARC Users Office
Procedures for J-PARC site
access
ID cardPortal site
Rental goods

Support Service for
Daily Life

Support for J-PARC Utilization

Accomodation
Rent-a-car
Living information

User room
Radiation/Facility
safety education

One-stop service for J-PARC users

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User Service

J-PARC Annual Report 2015

52

User Statistics
Users in 2015 (Japanese ⁄ Foreigners, person-days)
4,000

Foreigners
Japanese

3,500
3,000
2,500
2,000
1,500
1,000
500
0

4
2015

5

6

7

8

9

10

11

12

1
2016

2

3

Users in 2015 (according to organizations,person-days)

Users in 2015 (according to facilities,
person-days)

Other 12

Accelerato
1,080

Nertrino
8,087

Foreign
Organizaos

MLF 9,933

88,822

Japanese
Universies
16,767

Hadron9,591

PrivateEnterprises
682

䠄ே᪥䠅

2,000
1,800

䠄ே᪥䠅

MLF

2,500

Nertrino

1,400

Accelerator

2,000

1,000

600
400

500

200
0

Private Enterprises
Foreign Organizaons

1,500

1,000
800

Japanese UniversiesPublic Organizaons

Hadron

1,600

1,200

PublicOrganizaons
1,529

0

Other

J-PARC Annual Report 2015

User Service

53

MLF Proposals Summary - FY2015
The call for J-PARC MLF 2015B General Use Proposals were canceled. Because of the long downtime for maintenance ofthe neutron target, machine time allocated to 2014B and 2015A was shifted to 2015B.
Table 1. Breakdown of Proposals Numbers for the 2015A Rounds.

2015A

Beamline

Instrument

BL01

Full Year

Submitted Approved

Submitted

Approved

GU

GU

PU/S

IU

ES

PU/S

IU

ES

4D-Space Access Neutron Spectrometer - 4SEASONS

18(2)

13(1)

3

1

2

3

1

2

BL02

Biomolecular Dynamics Spectrometer - DNA

20(1)

17(1)

2

1

0

2

1

0

BL03

Ibaraki Biological Crystal Diffractometer iBIX

(100-b)‡

6

3

0

0

0

0

0

0

(b)†

3

3

16

0

0

15

0

0

BL04

Accurate Neutron-Nucleus Reaction Measurement Instrument- ANNRI

12

7

2

1

0

2

1

0

BL05

Neutron Optics and Physics - NOP

5

3

1

0

0

1

0

0

BL08

Super High Resolution Power Diffractometer S-HRPD

11

7

2

0

0

2

0

0

BL09

Special Environment Neutron Powder Diffractometer- SPICA

0

0

1

0

0

1

0

0

BL10

Neutron Beamline for Observation and Research Use NOBORU

8

7

3

1

0

3

1

0

BL11

High-Pressure Neutron Diffractometer - PLANET

9

8

0

1

0

0

1

0

BL12

High Resolution Chopper Spectrometer - HRC

13

8

4

0

0

4

0

0

BL14

Cold-neutron Disk-chopper Spectrometer - AMATERAS

25

10

4

1

1

4

1

1

BL15

Small and Wide Angle Neutron Scattering Instrument- TAIKAN

29(2)

15(2)

4

2

2

4

2

2

BL16

High-Performance Neutron Reflectometer with ahorizontal Sample Geometry - SOFIA

14

13

1

0

0

1

0

0

BL17

Polarized Neutron Reflectometer - SHARAKU

13

9

1

1

1

1

1

1

BL18

Extreme Environment Single Crystal Neutron Diffractometer- SENJU

24

12

2

2

1

2

2

0

BL19

Engineering Diffractometer - TAKUMI

28

13

3

1

1

3

1

1

BL20

Ibaraki Materials Design Diffractometer iMATERIA(100-b)‡

15

6

0

0

0

0

0

0

(b)

23

23

14

0

0

14

0

0

BL21

High Intensity Total Diffractometer - NOVA

22

12

4

0

0

4

0

0

BL22

Energy Resolved Netron Imagung System - RADEN

10

7

2

1

0

2

1

0

D1

Muon Spectrometer for Materials and Life Science
Experiments - D1

29(1)

20(1)

3

1

0

3

1

0

D2

Muon Spectrometer for Basic Science Experiments
- D2

12(2)

9(1)

2

1

0

2

1

0

U

Muon U

0

0

1

0

0

1

0

0

349

225

75

15

8

74

15

7

Total

†

GU : General Use
PU : Project Use or Ibaraki Pref. Project Use
S : S-type Proposals
IU : Instrument Group Use ES : Element Strategy† : Ibaraki Pref. Exclusive Use Beamtime (β = 80% in FY2014)‡ : J-PARC Center General Use Beamtime ((100-β = 20% in FY2014)( ) : Proposal Numbers under Trial Use Access System or P-type proposals (D1, D2) in GU

User Service

J-PARC Annual Report 2015

54

J-PARC PAC Approval Summary after the 21st Meeting(Co-)
Spokespersons
E03 K. Tanida
P04

J. C. Peng;
S. Sawada

Approval status (PAC
recommendation)

Beamline

Measurement of X rays from X– Atom

Stage 2

K1.8

U of Illinois at
Measurement of High-Mass Dimuon Production at the
Urbana50-GeV Proton Synchrotron
Champaign; KEK

DeferredPrimary

Affiliation
SNU

Title of the experiment

Status

E05 T. Nagae

Kyoto USpectroscopic Study of X-Hypernucleus, 12XBe, via the12
C(K–, K+) Reaction

Stage 2K1.8

E06 J. Imazato

KEK

Measurement of T-violating Transverse Muon
Polarization in K+ → p0 m+ n Decays

Stage 1K1.1BR

K. Imai,
E07 K. Nakazawa,
H. Tamura

JAEA, Gifu U,
Tohoku U

Systematic Study of Double Strangeness System withan Emulsion-counter Hybrid Method

Stage 2high priority in the SX
mode to run before
summer 2016

K1.8

Pion double charge exchange on oxygen at J-PARC

Stage 1K1.8

Osaka U,
Osaka EC U

Production of Neutron-Rich Lambda-Hypernuclei with
the Double Charge-Exchange Reaction (Revised from
Initial P10)

Stage 2

K1.8

Data taking

E11 T. Kobayashi

KEK

Tokai-to-Kamioka (T2K) Long Baseline Neutrino
Oscillation Experimental Proposal

Stage 2neutrino

Data taking

E13 H. Tamura

Tohoku U

Gamma-ray spectroscopy of light hypernuclei

Stage 2

K1.8

Finished

E14 T. Yamanaka

Osaka U

Proposal for KL → p0 n n-bar Experiment at J-PARC

Stage 2KL

Data taking

RIKEN, Kyoto U

A Search for deeply-bound kaonic nuclear states by inflight 3He(K-, n) reaction

Stage 2

K1.8BR

Data taking

RIKEN

Measurements of spectral change of vector mesons in
nuclei (previously "Electron pair spectrometer at the
J-PARC 50-GeV PS to explore the chiral symmetry in
QCD")

Stage 1High pU Tokyo, RIKEN

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

Registered as E62 with an
updated proposal

K1.8BR

H. Bhang,
E18 H. Outa,
H. Park

SNU, RIKEN,KRISSCoincidence Measurement of the Weak Decay of 12LC
and the three-body weak interaction process

Stage 2

K1.8

E19 M. Naruki

KEK

High-resolution Search for Q+ Pentaquark in p–p → K–X
ReactionsStage 2

K1.8

E21 Y. Kuno

Osaka U

An Experimental Search for μ − e Conversion at a
Sensitivity of 10−16 with a Slow-Extracted Bunched
BeamStage 1
TDR should be posted by
April 2nd for Stage 2

COMET

Osaka U

Exclusive Study on the Lambda-N Weak Interaction in
A=4 Lambda-Hypernuclei (Revised from Initial P10)

Stage 1

K1.8

T25 S. Mihara

KEK

Extinction Measurement of J-PARC Proton Beam at
K1.8BR

Test Experiment(coord'ed by JPNC)

K1.8BR

E26 K. Ozawa

KEK

Search for w-meson nuclear bound states in the p– + AZ →n +(A-1)w(Z-1) reaction, and for w mass modification in the
in-medium w→ p0g decay

Stage 1K1.8

E27 T. Nagae

Kyoto U

Search for a nuclear Kbar bound state K–pp in the d(p+,K+) reaction

Stage 2K1.8

E29 H. Ohnishi

RIKEN

Search for f-meson nuclear bound states in the pbar +Z → f + (A-1)f(Z-1) reaction

Stage 1K1.1

E31 H. Noumi

Osaka USpectroscopic study of hyperon resonances below KN
threshold via the (K–, n) reaction on DeuteronStage 2

K1.8BR

Data taking

T32 A. Rubbia

ETH, Zurich

Towards 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

Test Experiment

K1.1BR

Finished

Measurement of Neutron Electric Dipole Moment

Deferred

Linac

An Experimental Proposal on a New Measurementof the Muon Anomalous Magnetic Moment g-2 andElectric Dipole Moment at J-PARC

Stage 1
Carry out a focused reviewof the TDR

MLF

E08 A. Krutenkova ITEP
E10

E15

A. Sakaguchi,
T. Fukuda

M. Iwasaki,
T. Nagae

E16 S. Yokkaichi

E17

E22

R. Hayano,
H. Outa

S. Ajimura,
A. Sakaguchi

P33 H. M. Shimizu Nagoya U
E34

N. Saito,
M. Iwasaki

KEK, RIKEN

AFinished

Data taking

Data taking

J-PARC Annual Report 2015

User Service

55
(Co-)
Spokespersons

Title of the experiment

Approval status (PAC
recommendation)

Beamline

StatusHampton U,
Osaka U

Measurement of G(K → e+ n)/G(K → m+ n) and Searchfor heavy sterile neutrinos using the TREK detector
systemStage 2

K1.1BR

Finished

E40 K. Miwa

Tohoku U

Measurement of the cross sections of Σp scatterings

Stage 2

K1.8

P41 M. Aoki

Osaka U

An Experimental Search for μ − e Conversion in Nuclear
Field at a Sensitivity of 10−14 with Pulsed Proton Beamfrom RCS

Deferred

MLF

E42 J. K. Ahn

Pusan National
U

Search for H-Dibaryon with a Large AcceptanceHyperon Spectrometer

Stage 1
TDR should be updated
for Stage 2

K1.8

Ohio U, JAEA

3-Body Hadronic Reactions for New Aspects of Baryon
Spectroscopy

Stage 1K1.8

T46 K. Ozawa

KEK

EDIT2013 beam test program

Test Experiment

K1.1BR

Abandonded

T49 T. Maruyama

KEK

Test for 250L Liquid Argon TPC

Test Experiment

K1.1BR

Withdrawn

E50 H. Noumi

Osaka U

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

Stage 1IPNS should investigate
the safety aspect of thebeam-line

High p

T51 S. Mihara

KEK

Research Proposal for COMET(E21) Calorimeter
Prototype Beam Test

Test Experiment

K1.1BR

had to be
stoppedT52 Y. Sugimoto

KEK

Test of fine pixel CCDs for ILC vertex detector

Test Experiment

K1.1BRnotperformed
yet

T53 D. Kawama

RIKEN

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

Test Experiment

K1.1BRnotperformed
yet

T54 K. Miwa

Tohoku U

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

Test Experiment

K1.1BRnotperformed
yet

T55 A. Toyoda

KEK

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

Test Experiment

K1.1BR

had to be
stopped

E56 T. Maruyama

KEK

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

Stage 1 status

MLF

E57 J. Zmeskal

Stefan Meyer
Institute forSubatomic
Physics

Measurement of the strong interaction induced shift
and width of the 1s state of kaonic deuterium at
J-PARC

Stage 1 status
Commissioning run with
E62 before summer 2016

K1.8BRP58 M. Yokoyama

U. Tokyo

A Long Baseline Neutrino Oscillation Experiment Using
J-PARC Neutrino Beam and Hyper-Kamiokande

Deferredneutrino

T59 A. Minamino

Kyoto UA test experiment to measure neutrino cross sections
using a 3D grid-like neutrino detector with a watertarget at the near detector hall of J-PARC neutrino
beam-line

To be arranged by IPNS
and KEK-T2K

neutrino
monitor bld

Finished

T60 T. Fukuda

Toho U

Proposal of an emulsion-based test experiment at
J-PARC

Arranged by IPNS and
KEK-T2K

neutrino
monitor bld

Finished

P61 M. Wilking

Stony Brook U

nuPRISM

Deferredneutrino

R. Hayano,E62 S. Okada,
H. Outa

U. Tokyo, RIKEN Precision Spectroscopy of kaonic atom X-rays with TES

Stage 2
Commissioning run with
E57 before summer 2016

K1.8BR

E63 H. Tamura

Tohoku U

Stage 1

K1.1

E36

E45

M. Kohl,
S. Shimizu

K. H. Hicks,
H. SakoAffiliation++

Gamma-ray spectroscopy of light hypernuclei II

J-PARC Annual Report 2015

Organization and Committees

57

Organization and Committees

Organization and Committees

J-PARC Annual Report 2015

58

Organization Structure
J-PARC Center Organizaon Chart
as of April 1, 2015

Deputy Director(Safety)
T. Ishii

Radiaon Safety Secon

Safety Division
Y. Miyamoto - K. Bessho

Y. Kasugai - M. Numajiri
General Safety Secon
Y. Nakane
Accelerator Secon I
H. OguriAccelerator Secon II
M. Kinsho
Accelerator Secon III
N. Hayashi

Accelerator Division
K. Hasegawa - M. Kinsho, F. Naito

Accelerator Secon IV
K. Kikuchi
Accelerator Secon V
Y. Hori
Accelerator Secon VI
N. Yamamoto
Accelerator Secon VII

N. Saito

F. Naito

Director

Neutron Source Secon
H. Takada - K. Haga

Deputy Director(JAEA)
M. Futakawa

Neutron Science Secon

Materials & Life Science
Division
M. Futakawa - H. Seto, K. Soyama

K. Sakasai
Muon Science SeconTechnology Development Secon
K. Aizawa - T. Oku

T. KosekiParcle & Nuclear Physics
Division
T. Kobayashi - T. Komatsubara, Y. Fujii

Advisor (J-PARC) : S. Nagamiya: Y. Ikeda: Y. Fujii

Neutron Instrumentaon Secon

R. Kadono – N. Kawamura

Deputy Director(KEK)

Director’s Office

K. Nakajima - Y. Kawakita, S. Itoh

Nuclear Transmutaon
Division

Neutrino Secon
T. Nakadaira
Hadron Secon
S. Sawada

H. Oigawa - F. Maekawa
Cryogenics Secon
Y. Makida - K. Sasaki
Informaon System Secon
A. Manabe - K. Gorai
Operaons Support Secon
H. Yoshikawa
Public Relaons SeconAdministraon Division
T. Yamashita - S. Miyamoto

T. Yamashita - H. Terunuma
General Affairs Secon
S. Miyamoto - H. Morita
Users Affairs Secon
T. Yamashita - H. Terunuma
Users Office

K. Sakagami

J-PARC Annual Report 2015

Organization and Committees

59

Members of the Committees Organized for J-PARC(as of March, 2016)

1) Steering Committee
Yuji Fujita

Japan Atomic Energy Agency, Japan

Hisayoshi Ito

Japan Atomic Energy Agency, Japan

Yukihide Kamiya

High Energy Accelerator Research Organization, Japan

Kazuo Minato

Japan Atomic Energy Agency, Japan

Yukitoshi Miura

Japan Atomic Energy Agency, Japan

Naohito Saito

J-PARC Center, Japan

Yasuhide Tajima

Japan Atomic Energy Agency, Japan

Daiji Takeuchi

High Energy Accelerator Research Organization, Japan

Katsuo Tokushuku

High Energy Accelerator Research Organization, Japan

Kazuyoshi YamadaHigh Energy Accelerator Research Organization, Japan

Seiya Yamaguchi

High Energy Accelerator Research Organization, Japan

2) International Advisory Committee
Jean-Michel Poutissou

TRIUMF, Canada

Hiroshi Amitsuka

Hokkaido University, Japan

Sergio Bertolucci

European Organization for Nuclear Research (CERN), Switzerland

Robert Tschirhart

Fermi National Accelerator Laboratory (FNAL), USA

Thomas Roser

Brookhaven National Laboratory (BNL), USA

Shinian Fu

Institute of High Energy Physics (IHEP), China

Robert Robinson

Australian Nuclear Science and Technology Organization (ANSTO), Australia

Robert Tribble

Brookhaven National Laboratory (BNL), USA

Donald F. Geesaman

Argonne National Laboratory, USA

Horst Stoecker

GSI Helmholzzentrum für Schwerionenforschung, Germany

Hamid Aït Abderrahim

SCK·CEN, Belgium

Paul Langan

Oak Ridge National Laboratory (ORNL), USA

Hidetoshi Fukuyama

Tokyo University of Science, Japan

Andrew Dawson Taylor

Science and Technology Facilities Council (STFC), UK

3) User Consultative Committee for J-PARC
Tsuyoshi Nakaya

Kyoto University, Japan

Taku Yamanaka

Osaka University, Japan

Hiroaki Aihara

University of Tokyo, Japan

Takashi Kobayashi

High Energy Accelerator Research Organization (KEK), Japan

Hirokazu Tamura

Tohoku University, Japan

Tomofumi Nagae

Kyoto University, Japan

Takashi Nakano

Osaka University, Japan

Kazuhiro Tanaka

High Energy Accelerator Research Organization (KEK), Japan

Hajime Nanjo

Kyoto University, Japan

Organization and Committees

J-PARC Annual Report 2015

60
Masaki Fujita

Tohoku University, Japan

Mitsuhiro Shibayama

University of Tokyo, Japan

Hideaki Kitazawa

National Institute for Materials Science(NIMS), Japan

Yoshiaki Kiyanagi

Nagoya University, Japan

Masaaki Sugiyama

Kyoto University, Japan

Tosiji Kanaya

High Energy Accelerator Research Organization (KEK), Japan

Jun Akimitsu

Hiroshimao University, Japan

Kenya Kubo

International Christian University, Japan

Yasuhiro Miyake

High Energy Accelerator Research Organization (KEK), JapanJun Sugiyama

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

Hiroyuki Kishimoto

Sumitomo Rubber Industries, Ltd., Japan

Takashi Noma

Canon Inc., Japan

Eiko Torikai

Yamanashi University, Japan

Makoto Hayashi

Ibaraki Prefecture, Japan

Satoru Yamashita

University of Tokyo, Japan

Cheol-Ho Pyeon

Kyoto University, Japan

Yoshiyuki KajiJapan Atomic Energy Agency, Japan

4) Accelerator Technical Advisory Committee
Thomas Roser

Brookhaven National Laboratory (BNL), USA

Roland Garoby

European Spallation Source, Sweden

Alberto Facco

Laboratori Nazionali di Legnaro (INFN), Italy

Alan Letchford

Science and Technology Facilities Council (STFC), UK

Subrata Nath

Los Alamos National Laboratory (LANL), USA

Akira Noda

National Institute of Radiological Sciences

Michael Plum

Oak Ridge National Laboratory (ORNL), USA

Jie Wei

Michigan State University, USA

Robert Zwaska

Fermi National Accelerator Laboratory (FNAL), USA

Simone Gilardoni

European Organization for Nuclear Research (CERN), Switzerland

5) Neutron Advisory Committee
Robert McGreevy

Science and Technology Facilities Council (STFC), UK

Bertrand Blau

Paul Scherrer Institut (PSI), Switzerland

John D. Galambos

Oak Ridge National Laboratory (ORNL), USA

Yoshiaki Kiyanagi

Nagoya University, JapanDan Alan Neumann

National Institute of Standards and Technology (NIST), USA

Jamie Schulz

Australian Nuclear Science and Technology Organization(ANSTO), Australia

Dimitri Argyriou

European Spallation Source, Sweden

Chang Hee Lee

Korea Atomic Energy Research Institute (KAERI), Korea

Mitsuhiro Shibayama

University of Tokyo, Japan

Masaaki Sugiyama

Kyoto University, Japan

J-PARC Annual Report 2015

Organization and Committees

616) Muon Advisory Committee
Francis Pratt

Science and Technology Facilities Council (STFC), UK

Thomas Prokscha

Paul Scherrer Institut (PSI), Switzerland

Andrew MacFarlane

University of British Columbia, Canada

Klaus Jungmann

University of Groningen, Netherland

Kenya Kubo

International Chiristian University, Japan

Toshiyuki Azuma

RIKEN, Japan

Yasuo Nozue

Osaka University, JapanJun Sugiyama

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

7) Radiation Safety Committee
Seiichi Shibata

RIKEN, Japan

Yoshimoto Uwamino

RIKEN, Japan

Yoshihiro Asano

RIKEN, Japan

Tetsuo Noro

Kyushu University, Japan

Takeshi Murakami

Natinonal Insitute of Radiological Science, Japan

Yoshimoto Namito

High Energy Accelerator Research Organization (KEK), Japan

Shinichi Sasaki

High Energy Accelerator Research Organization (KEK), Japan

Hitoshi Kobayashi

High Energy Accelerator Research Organization (KEK), Japan

Kazuo Minato

Japan Atomic Energy Agency, Japan

Takeshi Maruo

Japan Atomic Energy Agency, Japan

Michio Yoshizawa

Japan Atomic Energy Agency, Japan

8) MLF Advisory Board
Jun Akimitsu

Okayama University/Hiroshima University, Japan

Yuji Kawabata

Kyoto University, Japan

Yoshiaki Kiyanagi

Nagoya University, Japan

Mitsuhiro Shibayama

University of Tokyo, JapanJun Sugiyama

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

Atsushi Nakagawa

Osaka University, Japan

Masaki Fujita

Tohoku University, Japan

Michihiro Furusaka

Hokkaido University, Japan

Tetsurou Minemura

Ibaraki Prefectural Government, Japan

Toshio Yamaguchi

Fukuoka University, Japan

Hiroshi Amitsuka

Hokkaido University, Japan

Kenya Kubo

International Christian University, Japan

Toshiji Kanaya

High Energy Accelerator Research Organization (KEK), Japan

Hideki Seto

High Energy Accelerator Research Organization (KEK), Japan

Takashi Kamiyama

High Energy Accelerator Research Organization (KEK), Japan

Toshiya Otomo

High Energy Accelerator Research Organization (KEK), Japan

Yasuhiro Miyake

High Energy Accelerator Research Organization (KEK), Japan

Ryosuke KadonoHigh Energy Accelerator Research Organization (KEK), Japan

Masatoshi Futakawa

Japan Atomic Energy Agency (JAEA), Japan

Organization and Committees

J-PARC Annual Report 2015

62
Kazuya Aizawa

Japan Atomic Energy Agency (JAEA), Japan

Masayasu Takeda

Japan Atomic Energy Agency (JAEA), Japan

Kazuhiko Soyama

Japan Atomic Energy Agency (JAEA), Japan

Kenji Nakajima

Japan Atomic Energy Agency (JAEA), Japan

Yukinobu Kawakita

Japan Atomic Energy Agency (JAEA), Japan

Jun-ichi Suzuki

Comprehensive Research Organization for Science and Society (CROSS), Japan9) Program Advisory Committee (PAC) for Nuclear and Particle Physics Experiments at the J-PARC 50 GeV Proton
Synchrotron
Kenichi ImaiJapan Atomic Energy Agency (JAEA), Japan

Akinobu DoteHigh Energy Accelerator Research Organization (KEK), Japan

Kunio Inoue

Tohoku University, Japan

Hajime Shimizu

Tohoku University, Japan

Hiroyoshi Sakurai

University of Tokyo, Japan

Kazunori Hanagaki

High Energy Accelerator Research Organization (KEK), Japan

Tetsuo Hatsuda

RIKEN Nishina Center for Accelerator-Based Science, Japan

Junji Haba

High Energy Accelerator Research Organization (KEK), Japan

Thomas E. Browder

University of Hawaii, USA

Simon I. Eidelman

Budker Institute of Nuclear Physics (BINP), Russia

Gino Isidori

University of Zurich, Switzerland

Edward C. Blucher

Fermi National Accelerator Laboratory (FNAL), USA

William C. Louis III

Los Alamos National Laboratory (LANL), USA

Wolfram Weise

Technical University of Munich, Germany

William A. Zajc

Columbia University, USA

10) TEF Technical Advisory Committee
Marc Schyns

SCK·CEN, Belgium

Eric Pitcher

European Spallation Source, Sweden

Yacine Kadi

European Organization for Nuclear Research (CERN), Switzerland

Yoshiaki Kiyanagi

Nagoya University, Japan

Toshikazu Takeda

Univesity of Fukui, Japan

Juergen Konys

Karlsruhe Institute of Technology, Germany

Minoru Takahashi

Tokyo Institute of Technology, Japan

Main Parameters

Main Parameters

J-PARC Annual Report 2015

64
Present main parameters of Accelerator
Linac
Acclerated Particles
EnergyPeak Current

Negative hydrogen
400 MeV
40 mA
0.3 ms for MLF
0.5 ms for MR

Pulse Width
Repetition Rate
Freq. of RFQ, DTL, and SDTL
Freq. of ACS

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
9996

Key parameters of Materials and Life Science Experimental Facility
Injection Energy
Repetition Rate

3 GeV
25 Hz

Neutron Source
Target Material
Mercury
Number of Moderators
3
Moderator Material
Supercritical hydrogen
Moderator Temperature/Pressure
20 K / 1.5 MPa
Number of Neutron Beam Ports
23
Muon Production Target
Target Material
Graphite
Number of Muon Beam Extraction Ports
4*
Neutron Instruments
Open for User Program (General Use)
18
Under Commissioning/Construction
2/1
Muon Instruments*
Open for User Program (General Use)
2
Under commissioning/construction
2/0(* As of March, 2016)

Events

EventsNew Director of the J-PARC Center(April 1)

Explanatory Meeting Held for Residents(April 3-5)

Naohito Saito, one of the Deputy Directors of the
J-PARC Center until March, 2015, took over the job of
the Director from Yujiro Ikeda, the former Director.

The J-PARC Center has completed renovation works
at the Hadron Experimental Facility, and held three
explanatory meetings at the Tokai Village for local residents. A total of 67 people participated in these meetings. The J-PARC Center apologized, once again, for
the incident and provided an overview of the incident
and related problems, reported on implementation of
the facility and equipment measures to prevent recurrence, as well as the efforts to strengthen the safety
management system and improve the safety awareness. At each venue, we heard valuable opinions fromthe participants, answered questions, and then closed
the meeting.

N. Saito, the new Director (left) with the former Directors,
Y. Ikeda (center) and S. Nagamiya (right)

Events

J-PARC Annual Report 2015

66

Visit by Princess Sirindhorn of theKingdom of Thailand (April 23)

FY2015 Workshops for Fostering Safety
Culture at J-PARC (May 22)

Her Royal Highness Princess Sirindhorn of theKingdom of Thailand visited J-PARC, and toured theMaterials and Life Science Experimental Facility (MLF)
and Neutrino Experimental Facility. After J-PARC, theprincess visited the Ibaraki Neutron Medical ResearchCenter and observed a next-generation cancer therapy,
Boron Neutron Capture Therapy (BNCT). The Princess
expressed her high expectations for stronger researchties with the Kingdom of Thailand in the future.

The Workshop for Fostering Safety Culture at
J-PARC is held every year around May 23, the date when
the radioactive material leak incident occurred at the
Hadron Experimental Facility in 2013. This year, theworkshop was held on May 22 in order to improve thesafety awareness of the J-PARC staff members and not
to forget the lessons learned from the incident. In theworkshop, Professor Shoji Tsuchida of Kansai University
who specialized in risk communication theory and social
psychology, gave an invited talk entitled “Psychology ofrisk communication and crisis communication”.

Resumption of the Operation at Hadron
Experimental Facility (April 24)
After the radioactive material leak incident, which
occurred on May 23, 2013, the J-PARC Center suspended
the operation of the Hadron Experimental Facility. The
repairs of the facility to prevent incident recurrence
have been finished, and were reported to the local
governments. We also held explanatory meetings for
local residents. On April 9, we opened the renovatedfacility to the media and explained to them that wewould start to check the facility performance, with theproton beam from the accelerator. On April 17, the facilities were inspected by the Nuclear Safety Technology
Center. The inspectors confirmed that there were no
problems, and we received the certificate on the April
21. Then, we resumed the operation on the April 24.

Ceremony to Commemorate theCompletion of the J-PARC Research
Building (May11)
A ceremony commemorating the completion of
the J-PARC Research Building was held on May 11, towhich we invited guests from the national and local
governments and companies involved in building’s
construction.

The unveiling ceremony of memorial signboard

The workshop for fostering safety culture at J-PARC

Defects in the Neutron Target Vessel
At the MLF, defects in the neutron target vessel
were confirmed at the end of April, and it was decided
to carry out the replacement work about two months
ahead from the original schedule, which canceled theuser operation for the period. We apologized to all ourusers for this inconvenience.

Concluded Agreement on Mutual
Cooperation with the Australian Nuclear
Science and Technology Organization(ANSTO) in the Field of Neutron Science(July 20)On July 20, in Australia, an agreement for mutual
cooperation in the field of neutron science with ANSTO
was concluded. Based on this agreement, the parties
would deepen research exchanges, and mutuallypromote creation of new results. The signing ceremony
for this five-year agreement was held at the openingof an international conference (AOCNS 2015) attended
by many researchers using neutrons from Asia andOceania.

J-PARC Annual Report 2015

Events67

Youngster’s Science Festival, 2015
National Conference / Exhibition Theme:
Learning about Magnetic Force with
Paper Clip Motors (July 25-26)

Dr Adi Paterson, the Chief Executive of ANSTO (right) and Dr
Naohito Saito, the Director of J-PARC Center (left)

Together with the Japan Atomic Energy Agency(JAEA), the J-PARC Center presented an experimentand demonstration booth at the 2015 National Conference of the Youngster’s Science Festival. At the booth,there was a class on how to make “clip motors” froma magnet, battery, paper clip and enamel wire, anddemonstrations of a “superconducting roller coaster”
and a “traveling battery”. The booth was a great success,attracting many participants.

2nd Asia-Oceania Conference on Neutron
Scattering (AOCNS 2015) (July 19-23)
AOCNS 2015 was held in Sydney, Australia, attended
by about 280 participants. There were about 60 scientists from Japan including J-PARC users and staff. There
were talks and discussions packed with information,
on topics ranging from science to technology development, and trends at the world’s neutron beam facilities.

J-PARC Hello Science -“Make a Clockwith Cardboard and Chopsticks!”
Summer Workshop for Children- (July31,
August 5, 20)
Just like last year, the J-PARC Center held a science
project workshop for fifth and sixth grade students
from the village’s elementary schools. This year’s theme
was making clocks using cardboard and chopsticks.
Everyone labored hard, and completed the clock one
way or another.

The workshop at the Tokai Village Library

The clip motor

J-PARC Hello Science “Run! Spin! The
Power of Magnets” (August 29)
J-PARC Hello Science was exhibited at a library
festival as part of a program commemorating the 30th
anniversary of the opening of the Tokai Village Library.
The exhibit featured demonstrations of various experiments using magnetic force, and a mini-workshop on
paper clip motors. About 50 children participated in
making the “world’s simplest clip motor”. Watching thecoils rotate in the motors they made, the children were
surprised that a motor could be made so easily.

Events

J-PARC Annual Report 2015

68

International Workshop on Future Potential of High-Intensity Proton Accelerators for
Particle and Nuclear Physics (HINT2015) (October 13-15)
An international workshop was held to discuss
the current status of elementary particle and nuclear
physics using high-intensity proton accelerators, suchas J-PARC, plans for high-intensity beams in the mega-watt class, and prospects for new domains opened up
by such facilities. The workshop was held at the Ibaraki
Quantum Beam Research Center, and was attended bymore than 130 researchers from 12 countries.

Participants of HINT 2015

Ozora Marche at Daijingu andMuramatsu-san Kokuzodo Temple(October 11)

KEK Professor Emeritus Koichiro
Nishikawa and K2K/T2K Collaboration
Receive Breakthrough Prize (November 8)

The Ozora Marche is held every year by the Tokai
Sightseeing Guide as an event for communicating theculture and history of Tokai Village to younger generations. The J-PARC Center participates by holding a“Science Experiment Corner” -“Superconducting Rollercoaster”, “Frigid World” using liquid nitrogen at –196°C,
and “Running Battery”- for promoting interaction withthe local community, and boosting interest in science.

Professor Emeritus Koichiro Nishikawa (former
Deputy Director, J-PARC) and the K2K/T2K Collaboration
received the 2016 Breakthrough Prize in Fundamental
Physics for their achievements in the discovery of andresearch on neutrino oscillation. The BreakthroughPrize was established in 2012, and is a set of international academic awards in the field of fundamental
physics, life science, and mathematics. Prof. Nishikawa
and the K2K/T2K collaboration were awarded jointlywith other four experiments, including the SuperKamiokande Experiment and KamLAND.

J-PARC Hello Science Event Held at 2015
Tokai Village Elementary School Festival(November 7)
As part of the J-PARC Center’s efforts to stimulate the interest of children in science, a J-PARC Hello
Science event on the power of electricity and magnetism was held at the 2015 Tokai Elementary School
Festival (33rd Annual).

Stopped MLF Operation
The MLF had been operating since October 27, but
operation was stopped on November 20 due to detection of moisture in the helium layer by a sensor installedin the neutron target vessel. Going through investigation/identification of the exact cause, it was deemednecessary to replace the neutron target vessel, and forthis reason it was decided to shut down operation of
the MLF for the time being. We apologized to all of our
MLF users for causing so much trouble.

J-PARC Annual Report 2015

Events69

The 7th AONSA Neutron School and the
3rd MLF School (December 1-5)
The 7th AONSA Neutron School and the 3rd MLF
School were held concurrently at MLF. These schools arefor young researchers and graduate students from theAsia/Oceania region, and this year, a total of 41 participants took part. In terms of content, there were lectures
on topics, such as neutron and muon science, followed
by training relating to beams, in which the participants
were divided into 12 small groups that worked to solve
experimental problems on various themes using experimental data to report on it on the final day.

J-PARC Science Gallery –Understanding
This Year’s Nobel Prize in Physics in Just
30 MinutesThe J-PARC Center held a Science Gallery in thevillage library, and Shinichi Sakamoto of the Public Relations Section provided an easy-to-understand explanation, starting from the question “What is an elementary
particle?” and covering the research results which
won the Nobel Prize in Physics 2015, “the discovery ofneutrino oscillation”.

Held J-PARC “Hello Science” Event at the
Science Club of Muramatsu Elementary
School, Tokai Village (January 20)
The J-PARC Center presented the amazing world ofbatteries and magnets at the science club of the Tokai
Village Muramatsu Elementary School. We showed theclub members the amazing movement of a battery
through a coil of copper wire. When the secrets of thevarious magnet movements were explained, everyone’s
curiosity seemed to be stimulated.

3rd Symposium on Safety in Accelerator
Facilities (January 27-28)
The J-PARC Center holds a safety symposium every
year to exchange information and discuss efforts for
ensuring facility safety and related matters. The participants were about 150 concerned people from various
facilities, universities and companies in Japan, whoshared information on various safety issues. In thisyear, two kinds of topics, "Management of radioactivity
induced in accelerator facilities" and "Safety measuresfor low-temperature equipment and high-pressure gas
equipment at accelerator facilities" were featured in thepresent symposium in addition to the existing topics
such as "Lessons learned from incidents" and "Radiation
safety at accelerator facilities".

Held J-PARC “Hello Science” Event at theChristmas Festival of the Ibaraki Science
Museum of Atomic Energy –“Let’s Makea Kaleidoscope of Light and Paper Clip
Motors!”- (December 23)

SAT Technology Showcase 2016
Exhibited by J-PARC (February 4)

A J-PARC “Hello Science” event was held at theannual Christmas Festival in the Ibaraki Science
Museum of Atomic Energy. Participants heard a talkabout the wonders of light, and then made a kaleidoscope, a picture pattern made with pin holes appeared
to sparkle with rainbow colors. They also had the time
to make the world’s simplest paper clip motor. Eventswere held four times gathering 100 participants.

The J-PARC Center presented a booth featuring our
projects at the SAT Technology Showcase 2016 held by
the Science Academy of Tsukuba (SAT). The aim of thisevent was to announce research results and producttechnologies, and promote interaction between
researchers and engineers. Many visitors stopped by
J-PARC booth and gave us many questions about accelerators and the experiments.

Participants listened closely wonders of light

At the J-PARC boothEvents

J-PARC Annual Report 201570

Restarting of the MLF Operation(February 20)
Due to the problem with the neutron target vessel,
we stopped the beam operation from November 24.
After the investigation of the cause and the replacement of the target vessel with the same type that hadprovided the most reliable performance in the past,
which was designed for lower output, we restarted theMLF operation with proton beam of 200 kW power.

1st ANSTO-J-PARC International
Research Collaboration Workshop(March 2-3)
Over the two days, the 1st ANSTO-J-PARC International Research Collaboration Workshop was held at the
J-PARC. This workshop was based on the memorandumof understanding on collaboration in the field of
neutron science concluded in July, 2015. The approachto substantial research collaboration was discussed
there.

FY2015 Quantum Beam Science Festa (7th MLF Symposium) (March 15-16)
The joint science festa of the KEK Institute of Materials Structure Science and the MLF was renamed thisyear as the “Quantum Beam Science Festa”, and it washeld at the Tsukuba International Congress Center,with about 570 participants, including those attending
the MLF Symposium and the PF Symposium on theParticipants of the Quantum Beam Science Festasecond day. In the MLF Symposium, Toshiji Kanaya,
Division Head of the Materials and Life Science Division,
reported on topics such as future plans, user programs,
the development situation of instruments and otherequipment, problem with the target vessel, and how
those problems are being handled.

J-PARC Annual Report 2015

Events71

MOU Signing Ceremony on Establishinga J-PARC Branch Office (March 18)
Osaka University and High Energy Accelerator
Research Organization (KEK) have an agreement topromote collaboration and cooperation between thetwo organizations. Osaka University has participated inmany research projects using the Hadron Experimental
Facility and other systems. Based on the cooperative
agreement, it was decided to establish the Osaka University J-PARC Center Branch Office at KEK Tokai Building
No.1. The signing ceremony for the Memorandum ofUnderstanding was held at the J-PARC Center.

Science Café: “Does Ibaraki Prefecture
Really Rank Lowest in Attractiveness!” –The Appeal of Ibaraki, using Neutrons
to Examine Everything from the Riddleof Life to Food Culture” (March 19)
At a Science Café organized by the JAEA, Hiroshi
Nakagawa, Assistant Principal Researcher of the
Quantum Beam Science Center, spoke on the theme
mentioned in the title with J-PARC public relations
advisor Shinichi Sakamoto acting as facilitator. Dr.
Nakagawa is a researcher conducting experiments withneutrons at MLF, and he talked about the neutrons
used in life science research and experiments. His talkcovered the research of the storage characteristics offoods using neutrons with introducing an example“dried sweet potatoes”, a noted product of Ibaraki
Prefecture. There were many questions from the 20
participants regarding this topic from daily life.

Participants of MOU signing ceremony

The Science Café at Tokai industry and information Plaza

Visitors
Akimasa Ishikawa, member of the House of Representatives (April 20)

Jonathan Joo-Thomson, Head of Climate Change andEnergy Section, British Embassy, Tokyo (October 19)

Masayoshi Yoshino, member of the House of Representatives (May 1)

Lee, Gaonyup, Principal Researcher/Manager, Nuclear
Emergency Preparedness, KAERI and others (November
5)

Koji Omi, Founder and Chairman, Science and Technology in Society Forum (STS Forum) (June 22)
Adi Paterson, CEO, Australian Nuclear Science and Technology Organization (ANSTO) (August 18)

Logachev, Pavel Vladimirovich, Director, Budker Institute of Nuclear Physics (BINP) (December 2)
Nisamaneephong Pornthep, Executive Director, Thailand Institute of Nuclear Techmology (TINT) (March 11)

Richard Garrett, Senior Advisor, ANSTO (September 9)
Shojiro Nishio, President, Osaka University (March 18)
Sukiman bin Sarmani, Chairman, Atomic Energy
Licensing Board (AELB) and others (September 10)

Events

J-PARC Annual Report 2015

72

There were 3,023 visitors to J-PARC for the period from April, 2015, to the end of March, 2016.
ln-house

Public Officers

3%
Foreigners
19%

Junior-high/High school
students, teachers

7%
13%

VIP, lawmakers 2%
University
students,
experts
19%

Media 1%Business
18%
Local
residents
18%

Publications

Publications

J-PARC Annual Report 2015

74(A) Publications in Periodical Journals
A-001
Ohisa, S. et al.
Molecular Interdiffusion between Stacked
Layers by Solution- and Thermal AnnealingProcess in Organic Light Emitting Devices
ACS Appl. Mater. Interfaces, Vol 7, 20779 (2015)
A-002
Komatsu, K. et al.
Crystal structure of magnesium dichloride
decahydrate determined by X-ray andneutron diffraction under high pressure
Acta Crystallographica, Vol B 71, 74-80 (2015)
A-003
Gong, W. et al.
Effect of prior martensite on bainite
transformation in nanobainite steel
Acta Materialia, Vol 85, 243-249 (2015)
A-004
Zmeskal, J. et al.
MEASUREMENT OF THE STRONG
INTERACTION INDUCED SHIFT AND WIDTHOF THE 1s STATE OF KAONIC DEUTERIUM AT
J-PARC
Acta Phys. Pol. B Vol. 46, p. 101
A-005
Okuchi, T. et al.
Synthesis of large and homogeneous single
crystals of water-bearing minerals by slow
cooling at deep-mantle pressures
American Mineralogist (2015)
A-006
Ninomiya, K. et al.
Nondestructive Elemental Depth-Profiling
Analysis by Muonic X-ray Measurement
Analytical Chemistry, Vol 87, 4597-4600 (2015)
A-007
Mizoguchi, H. et al.
An anti CuO2-type metal hydride square net
structure in Ln2M2As2H(x) (Ln=La or Sm,
M=Ti, V, Cr, or Mn)
Angew. Chem. Int. Edit., Vol 54, 2932-2935 (2015)
A-008
Takagi, S. et al.
True Boundary for the Formation of
Homoleptic Transition-Metal Hydride
Complexes
Angew. Chem. Int. Edit., Vol 54, 5650-5653 (2015)
A-009
Sato, T. et al.
Overview of particle and heavy ion transport
code system PHITS
Annals Nucl. Energy Vol. 82, p. 110
A-010
Iio, M. et al.
Test Results of a Nb3Al/Nb3Sn Subscale

Magnet for Accelerator Application IEEE Trans.
Appl. Supercond. Vol. 25, 4003405
A-011
Shishido, H. et al.
Neutron detection using a current biased
kinetic inductance detector
Applied Physics Letters, Vol 107, 23601 (2015)
A-012
Matsuo, T. et al.
Internal dynamics of F-actin and myosin
subfragment-1 studied by quasielastic
neutron scattering
Biochemical and Biophysical ResearchCommunications, Vol 459, 493-497 (2015)
A-013
Sugiyama, M. et al.
Solution structure of variant H2A.Z.1
nucleosome investigated by small-angle
X-ray and neutron scatterings
Biochemistry and Biophysics Reports, Vol 4, 2832 (2015)
A-014
Taminato, S. et al.
Highly reversible capacity at the surface of alithium-rich manganese oxide: a model study
using an epitaxial film system
Chemical Communications, Vol 51, 1673 (2015)
A-015
Mitsumi, M. et al.
Proton Order-Disorder Phenomena
in a Hydrogen-Bonded Rhodium-η5Semiquinone Complex: A Possible DielectricResponse Mechanism
Chemistry-Eur. J., Vol 21, 9682-9696 (2015)
A-016
Matsukawa, T. et al.
Neutron crystal structure analysis ofstilbazolium derivatives for terahertz-wave
generation
CrystEngComm, Vol 17, 2616-2619 (2015)
A-017
Makowska, M. G. et al.
Phase Transition Mapping by Means of
Neutron Imaging in SOFC Anode Supports
during Reduction under Applied Stress
ECS Transactions, Vol 68, 1103 (2015)
A-018
Mizuno, Y. et al.
Synthesis, crystal structure, andelectrochemical properties of
Li1.2+xMn0.3Co0.2Ni0.3O2 (x > 0) for
lithium-ion battery cathodes
Electrochemistry, Vol 83, 820-823 (2015)
A-019
Idemoto, Y. et al.

Average and Local Crystal Structureand Electronic Structure of 0.4Li2MnO30.6LiMn1/3Ni1/3Co1/3O2 Using First-principles
Calculations and Neutron Beam andSynchrotron X-Ray Sources
Electrochemistry, Vol 83, 879-884 (2015)
A-020
Iwamoto, H. et al.
Sensitivity and uncertainty analysis of the
VENUS-F critical core
Energy Procedia, Vol 71, 33 (2015)
A-021
Kimura, A. et al.
Current activities and future plans for nuclear
data measurements at J-PARC
Eur. Phys. J. A, Vol 51, 180 (2015)
A-022
Komatsu, K. et al.
Zr-based bulk metallic glass as a cylindermaterial for high pressure apparatuses
High Pressure Research, Vol 35, 254-262 (2015)
A-023
Shimomura, K.
Muonium in J-PARC; from fundamental toapplication
Hyperfine Interact. Vol. 233, p. 89
A-024
Yoshida, M. et al.
Status of Superconducting Solenoid System
for COMET Phase-I Experiment at J-PARC
IEEE Trans. Appl. Supercond. Vol. 25, 4500904
A-025
Nomura, S. et al.
Design Study on Pulsed Power Supplies for
the J-PARC Main Ring Magnets Using SMES
IEEE Trans. Appl. Supercond. Vol. 25, 5700805
A-026
Suzuki, S. Y. et al.
The Beamline DAQ System for the T2K
ExperimentIEEE Trans. Nucl. Sci. Vol. 62, p. 1169
A-027
Kawamura, K. et al.
Structural Origin of the Anisotropic andIsotropic Thermal Expansion of K2NiF4‑Type
LaSrAlO4 and Sr2TiO4Inorganic Chemistry, Vol 54, 3896–3904 (2015)
A-028
Baker, M. L. et al.
Relationship between Torsion andAnisotropic Exchange Coupling in a TbIIIRadical-Based Single-Molecule Magnet
Inorganic Chemistry, Vol 54, 5732-5738 (2015)

J-PARC Annual Report 2015

Publications

75
A-029
Iwase, K. et al.
Crystal Structure Analysis of La2Ni6CoDx
During Deuterium Absorption Process
Inorganic Chemistry, Vol 54, 8650-8655 (2015)
A-030
Li, K. et al.
Synthesis, Structure, and Pressure-Induced
Polymerization of Li3Fe(CN)6 Accompaniedwith Enhanced Conductivity
Inorganic Chemistry, Vol 54, 11276-11282 (2015)
A-031
He, S. et al.
Unusal Tempering Behavior of Fe-Cr-C
Martensite
ISIJ International, Vol 55, 686-690 (2015)
A-032
Oba, Y. et al.
Simultaneous characterization of
precipitates and matrix in a steel using smallangle neutron scattering and Bragg-edgetransmission analysis
ISIJ International, Vol 55, 2618 (2015)
A-033
Zhang, Q. H. et al.
An in situ neutron diffraction study ofanomalous superelasticity in a strain glass
Ni43Fe18Ga27Co12 alloy
J. Appl. Crystallogr., Vol 48, 1183-1191 (2015)
A-034
Miura, A. et al.
Design and delivery of beam monitors forthe energy-upgraded linac in J-PARC
J. Korean Phys. Soc. Vol. 66, p. 364
A-035
Kwon, O. et al.
Synthesis, structure, and conduction
mechanism of the lithium superionic
conductor Li10+δGe1+δP2−δS12
J. Mater. Chem. A, Vol 3, 438-446 (2015)
A-036
Fujii, K. et al.
Improved oxide-ion conductivity of
NdBaInO4 by Sr doping
J. Mater. Chem. A, Vol 3, 11985-11990 (2015)
A-037
Ikeda, Y. et al.
Transport and Thermodynamic Studies ofStripe and Checkerboard Ordering in Layered
Nickel Oxides R2-xSrxNiO4 (R = La and Nd)
J. Phys. Soc. Jpn., Vol 84, 023706 (2015)
A-038
Kobayashi, Y. et al.
Identification of Various Coexisting Phases inSuperconducting and Non-superconducting
Samples of RbxFe2−ySe2
J. Phys. Soc. Jpn., Vol 84, 44710 (2015)

A-039
Kajimoto, R. et al.
Development of Spin Correlations in theGeometrically Frustrated Triangular-Lattice
Heisenberg Antiferromagnet CuCrO2
J. Phys. Soc. Jpn., Vol 84, 074708 (2015)
A-040
Kamazawa, K. et al.
Spin Fluctuation in YBaFe4O7+δ with
Geometrically Frustrated Pyrochlore Latticeof Fe Spins
J. Phys. Soc. Jpn., Vol 84, 104711 (2015)
A-041
Ikeda, Y. et al.
Single-Crystal Neutron Diffraction Study ofthe Heavy-Electron Superconductor CeNiGe3
J. Phys. Soc. Jpn., Vol 84, 123701 (2015)
A-042
Nakadaira, T.
The graphite target for J-PARC neutrino
beam-line
J. Radioanal. Nucl. Chem. Vol. 305, p. 777
A-043
Takahashi, H. et al.
Indirectly water-cooled production target at
J-PARC hadron facility
J. Radioanal. Nucl. Chem. Vol. 305, p. 803
A-044
Makimura, S. et al.
Development of muon rotating target at
J-PARC/MUSE
J. Radioanal. Nucl. Chem. Vol. 305, p. 811
A-045
Saha, P. K. et al.
Measurement of continuous degradation ofa stripper foil during ths operation with 300
kW beam power in the 3-GeV RCS of J-PARC
J. Radioanal. Nucl. Chem. Vol. 305, p. 851
A-046
Yamazaki, Y. et al.
Analyses and the effect of impurities
contained in charge stripper foils for the
3-GeV RCS of J-PARC
J. Radioanal. Nucl. Chem. Vol. 305, p. 859
A-047
Yoshimoto, M. et al.
Maintenance of radio-activated stripper foils
in the 3 GeV RCS of J-PARC
J. Radioanal. Nucl. Chem. Vol. 305, p. 865

Bisphosphonate Bound to Farnesyl
Pyrophosphate Synthase
Journal of Medicinal Chemistry, Vol 58, 75497556 (2015)
A-050
Wan, T. et al.
In-situ structural integrity evaluation for
high-power pulsed spallation neutron source– Effects of cavitation damage on structural
vibration
Journal of Nuclear Materials, Vol 468, 321-330(2015)
A-051
Negm, H. et al.
Reaction-yield dependence of the (γ, γ')reaction of ^238U on the target thickness
Journal of Nuclear Science and Technology,
p.811 - 820 (2015)
A-052
Kogawa, H. et al.
Development of microbubble generator for
suppression of pressure waves in mercury
target of spallation source
Journal of Nuclear Science and Technology, Vol
52, 1461-1469 (2015)
A-053
Idemoto, Y. et al.
Characterization, average and electronic
structures during charge–discharge cycle
in 0.6Li2MnO3–0.4Li(Co1/3Ni1/3Mn1/3)O2 solid
solution of a cathode active material for Liion battery
Journal of Power Sources, Vol 273, 1023-1029(2015)A-054
Yoshida, G. et al.
Muon capture probability of carbon andoxygen for CO, CO2, and COS under lowpressure gas conditions
Journal of Radioanalytical and Nuclear
Chemistry, Vol 303, 1277-1281 (2015)
A-055
Saha, P. K. et al.
Measurement of continuous degradation ofa stripper foil during six months operation
with 300 kW beam power in the 3-GeV RCS
of J-PARC
Journal of Radioanalytical and Nuclear
Chemistry, Vol 305, 851 (2015)

A-048
Sato, M. et al.
Liquid 3He target for an experimental search
for nuclear anti-kaon bound states in J-PARC
J. Radioanal. Nucl. Chem. Vol. 305, p. 883

A-056
Unno, M. et al.
Insights into the Proton Transfer Mechanismof a Bilin Reductase PcyA Following Neutron
Crystallography
Journal of the American Chemical Society, Vol
137, 5452-5460 (2015)

A-049
Yokoyama, T. et al.
Protonation State and Hydration of

A-057
Tamura, J. et al.
High-power Test of Annular-ring CoupledPublications

J-PARC Annual Report 2015

76
Structures for the J-PARC Linac Energy
UpgradeJournal of the Korean Physical Society, Vol 66,
399 (2015)A-058
神谷 潤一郎 他
J-PARC RCS キッカー電磁石の In Situ での脱ガス
Journal of the vacuum society of Japan, Vol 58,
134 (2015)
A-059
荻原 徳男
回転円板から放出される気体分子の指向性に関するシミュレーション
Journal of the vacuum society of Japan, Vol 58,
168 (2015)
A-060
Kamiya, J. et al.
Titanium Alloy as a Potential Low
Radioactivation Vacuum Material
Journal of Vacuum Science and Technology A,
Vol 33, 031606-1 (2015)
A-061
岩元 大樹、 西原 健司、 他
パルス中性子源法を用いた未臨界度のオン
ライン測定
KURRI KR (CD) (CD-ROM),50, ROMBUNNNO.5(2015)
A-062
Hirata, T. et al.
Effect of Local Chain Dynamics on a Bioinert
Interface
Langmuir, Vol 31, 3661 (2015)
A-063
Chen, F. et al.
Confinement Effect on the Effective Viscosityof Plasticized Polymer Films
Macromolecules, Vol 48, 7719 (2015)
A-064
Cheon, C. I. et al.
Monoclinic ferroelectric NaNbO3 at room
temperature: Crystal structure solved byusing super high resolution neutron powder
diffraction
Mater. Lett. Vol. 156, p. 214
A-065
Shi, Z. M. et al.
Study of tempering behavior of lathmartensite using in situ neutron diffraction
Materials Characterization, Vol 107, 29-32(2015)
A-066
Shi, Z. et al.
Effect of non-isothermal deformation ofaustenite on ferrite transformation behavior
studied by in-situ neutron diffraction
Materials Science and Engineering: A, Vol 631,
153-159 (2015)

A-067
Sato, H. et al.
Relation between Vickers Hardness andBragg-Edge Broadening in Quenched
Steel Rods Observed by Pulsed Neutron
Transmission Imaging
Materials Transactions, Vol 56, 1147 (2015)

A-077
Sekiguchi, T. et al.
Development and operational experience ofmagnetic horn system for T2K experiment
Nucl. Instrum. Methods Phys. Res. A Vol. 789, p. 57

A-068
Nii, Y. et al.
Uniaxial stress control of skyrmion phase
Nature Commun, Vol 6, 8539 (2015)

A-078
Matsumura, T. et al.
Photon-veto counters at the outer edgeof the endcap calorimeter for the KOTO
experiment
Nucl. Instrum. Methods Phys. Res. A Vol. 795, p. 19

A-069
Saito, N. et al.
2nd International Symposium on Scienceat J-PARC: Unlocking the Mysteries of Life,
Matter, and the Universe
Neutron News Vol. 26, No. 1, p. 10

A-079
Kim, S. H. et al.
Cosmic-ray test of a time-of-flight detector
for double-strangeness experiments at
J-PARC
Nucl. Instrum. Methods Phys. Res. A Vol. 795, p. 39

A-070
Segawa, M. et al.
Development of a pulsed neutron threedimensional imaging system using a highly
sensitive image-intensifier at J-PARC
NUCL INSTRUM METH A, Vol 769, 97 (2015)

A-080
Tabata, M. et al.
Fabrication of silica aerogel with n=1.08 fore+/μ+ separation in a threshold Cherenkov
counter of the J-PARC TREK/E36 experiment
Nucl. Instrum. Methods Phys. Res. A Vol. 795, p. 206

A-071
Hasemi, H. et al.
Evaluation of nuclide density by neutron
resonance transmission at the NOBORU
instrument in J-PARC/MLF
NUCL INSTRUM METH A, Vol 773, 137 (2015)

A-081
Nomura, M. et al.
Mechanisms of increasing of the magnetic
alloy core shunt impedance by applying atransverse magnetic field during annealing
Nucl. Instrum. Methods Phys. Res. A Vol. 797, p.
196

A-072
Hino, M. et al.
The ion beam sputtering facility at KURRI:
Coatings for advanced neutron opticaldevicesNucl. Instr. and Meth. A, Vol 797, 265 (2015)
A-073
Koike, T. et al.
Development of a low-temperature
germanium detector via mechanical coolingwith a compact pulse-tube refrigerator
Nucl. Instrum. Methods Phys. Res. A Vol. 770, p. 1
A-074
Saha, P. K. et al.
Measurement of 181 MeV H− ions stripping
cross-sections by carbon stripper foil
Nucl. Instrum. Methods Phys. Res. A Vol. 776, p. 87
A-075
Miyazaki, Y. et al.
Performance test of a lead-glass counter for
the J-PARC E36 experiment
Nucl. Instrum. Methods Phys. Res. A Vol. 779, p. 13
A-076
Hattori, T. et al.
Design and performance of high-pressure
PLANET beamline at pulsed neutron source
at J-PARC
Nucl. Instrum. Methods Phys. Res. A Vol. 780, p. 55

A-082
Arimoto, Y. et al
Development of time projection chamber for
precise neutron lifetime measurement using
pulsed cold neutron beams
Nucl. Instrum. Methods Phys. Res. A Vol. 799, p.
187
A-083
Saha, P. K. et al.
Measurement of 181MeV H– ions stripping
cross-sections by carbon stripper foil
Nuclear Instrumentation and Method in
Physics Research: Section A, Vol 776, 87 (2015)
A-084
Hotchi, H, et al.
Numerical study for beam loss occurring for
wide-ranging transverse injection painting
and its mitigation scenario in the J-PARC
3-GeV RCS
Nuclear Instruments and Methods in Physics
Research A 778 102–114 (2015)
A-085
Hattori, T. et al.
Design and performance of high-pressure
PLANET beamline at pulsed neutron source
at J-PARC
Nuclear Instruments and Methods in Physics
Research Section A, Vol 780, 55-67 (2015)

J-PARC Annual Report 2015

Publications

77
A-086
Aoki, K. et al.
Operation of the SKS magnet at the K1.8
beam line in the J-PARC hadron hall
Phys. Procedia Vol. 67, p. 809
A-087
Kino, K. et al.
First Imaging Experiment of a Lithium
Ion Battery by a Pulsed Neutron Beam at
J-PARC/MLF/BL09
Phys. Procedia Vol. 69, p. 612
A-088
Katabuchi, T. et al.
Misassigned neutron resonances of Nd142 and stellar neutron capture crosssections
Phys. Rev. C, Vol 91, 37603 (2015)
A-089
Abe, K. et al.
Search for short baseline νe disappearancewith the T2K near detector
Phys. Rev. D Vol. 91, 051102
A-090
Abe, K. et al.
Measurements of neutrino oscillation inappearance and disappearance channels
by the T2K experiment with 6.6 ×1020
protons on target
Phys. Rev. D Vol. 91, 072010

acrylate)/poly(methyl methacrylate) blend
films in waterPhysical Chemistry Chemical Physics , Vol 17,17399 (2015)
A-096
菖蒲田 義博 他
Triangle and concave pentagon electrodes
for an improved broadband frequency
response of stripline beam position
monitors
physical review accelerator and beams, Vol
19, 21003-1 (2016)
A-097
Mori, K. et al.
Direct Observation of Fast Lithium-Ion
Diffusion in a Superionic Conductor:
Li7P3S11 Metastable Crystal
Physical Review Applied, Vol 4, 054008 (2015)
A-098
Hayashida, S. et al.
Magnetic model in multiferroic
NdFe3(BO3)4 investigated by Inelastic
Neutron Scattering
Physical Review B, Vol 92, 054402 (2015)
A-099
Yamauchi, I. et al.
Structural anomalies and short-range
magnetic correlations in the orbitally
degenerate system Sr2 VO4Physical Review B, Vol 92, 064408 (2015)

A-091
Abe, K. et al.
Measurement of the νμ charged current
quasielastic cross section on carbon with
the T2K on-axis neutrino beam
Phys. Rev. D Vol. 91, 112002

A-100
Shimomura, K. et al.
Electronic structure of Mu-complex donor
state in rutile TiO2
Physical Review B, Vol 92, 075203 (2015)

A-092
Abe, K. et al.
Measurement of the electron neutrino
charged-current interaction rate on waterwith the T2K ND280 π0 detector
Phys. Rev. D Vol. 91, 112010

A-101
Ito, T. U. et al.
Perturbation on hyperfine-enhanced 141Pr
nuclear spin dynamics associated with
antiferroquadrupolar order in PrV2Al20
Physical Review B, Vol 92, 125151 (2015)

A-093
Abe, K. et al.
Measurement of the νμ charged-current
quasielastic cross section on carbon with
the ND280 detector at T2K
Phys. Rev. D Vol. 92, 112003

A-102
Umegaki, I. et al.
Spinon, soliton, and breather in the spin1/2 antiferromagnetic chain compound
KCuGaF6
Physical Review B, Vol 92, 174412 (2015)

A-094
Tamura, F. et al.
High intensity single bunch operation withheavy periodic transient beam loading inwide band rf cavities
Phys. Rev. ST Accel. Beams, Vol 18, 91004(2015)

A-103
Hase, M. et al.
Magnetic excitations in the spin-1/2
tetramer substance Cu2 114Cd11B2O6
obtained by inelastic neutron scatteringexperiments
Physical Review B, Vol 92, 184412 (2015)

A-095
Hirata, T. et al.
Effect of interfacial structure on bioinert
properties of poly(2-methoxyethyl

A-104
Lee, H. et al.
Interpenetration of Chemically Identical
Polymer onto Grafted Substrates

Polymer, Vol 74, 70 (2015)
A-105
Hirata, T. et al.
Construction of a blood-compatible
interface based on surface segregation ina polymer blend
Polymer, Vol 78, 219 (2015)
A-106
Suzuki, K. et al.
Measurement of the muon beam direction
and muon flux for the T2K neutrino
experimentProg. Theor. Exp. Phys. 2015, 053C01
A-107
Abe, K. et al.
Physics potential of a long-baseline
neutrino oscillation experiment using
a J-PARC neutrino beam and HyperKamiokande
Prog. Theor. Exp. Phys. 2015, 053C02
A-108
Hashimoto, T. et al.
Search for the deeply bound K−pp statefrom the semi-inclusive forward-neutron
spectrum in the in-flight K−reaction on
helium-3
Prog. Theor. Exp. Phys. 2015, 061D01
A-109
Ajimura, S. et al.
On-site background measurements for the
J-PARC E56 experiment: A search for thesterile neutrino at J-PARC MLF
Prog. Theor. Exp. Phys. 2015, 063C01
A-110
Maeda, Y. et al.
An aerogel Cherenkov detector for multiGeV photon detection with low sensitivity
to neutrons
Prog. Theor. Exp. Phys. 2015, 063H01
A-111
Payra, D. et al.
Bioinspired adhesive polymer coatings for
efficient and versatile corrosion resistance
RSC Advances, Vol 5, 15977 (2015)
A-112
Nakamura, A. et al.
“Newton’s cradle” proton relay withamide–imidic acid tautomerization in
inverting cellulase visualized by neutron
crystallography
Science Advances, Vol 1, e1500263 (2015)
A-113
Funamori, N. et al.
Muonium in Stishovite: Implications for
the Possible Existence of Neutral Atomic
Hydrogen in the Earth's Deep Mantle
Scientific Reports, Vol 5, 8437 (2015)

Publications

J-PARC Annual Report 2015

78
A-114
Mori, K. et al.
Three-dimensional structures and lithiumion conduction pathways of (Li2S)x(GeS2)100−x superionic glasses
Solid State Ionics, Vol 280, 44-50 (2015)

A-115
Osamura, K. et al.
Local strain exerted on Nb 3 Sn filaments
in an ITER strand
Superconductor Science and Technology, Vol
28, 45016 (2015)

A-116
明午 伸一郎J-PARC MLF の大強度ビームコミッショニン
グの現状
波紋 , Vol 25, 271 (2015)(C) Conference Reports and Books
C-001
Saha, P. K. et al.
First Simulation Results of Heavy-ion
Acceleration in the RCS of J-PARC
13th International Conf. on Heavy Ion
Accelerator Technology (HIAT 2015), 127(2015)
C-002
Ueno, A. et al.
Emittance measurements for optimum
operation of the J-PARC RF-driven H- ionsourceAIP Conf. Proc., Vol 1655, 030009 (2015)
C-003
Ueno, A. et al.
Rod-filter-field optimization of the J-PARC
RF-driven H- ion source
AIP Conf. Proc., Vol 1655, 030010 (2015)
C-004
Nakajima, K. et al.
Beam-transport optimization for coldneutron spectrometer
EPJ Web of Conf., Vol 83, 03011 (2015)
C-005
Yokoo, T. et al.
Polarized neutron spectrometer for
inelastic experiments at J-PARC : Status of
POLANO Project
EPJ Web of Conferences, Vol 83, 03018 (2015)
C-006
Hori, J. et al.
Neutron Capture Cross Section
Measurement on 91Zr at J-PARC/MLF/
ANNRI
EPJ Web of Conf. (Internet), Vol 93, 2004 (2015)
C-007
Harada, H. et al.
Accuracy Improvement of Neutron
Nuclear Data on Minor Actinides
EPJ Web of Conf. (Internet), Vol 93, 6001 (2015)
C-008
Shimomura, K.
Muonium in J-PARC; from fundamental
toapplication
Hyperfine Interactions, Vol 235, 89-95 (2015)

C-009
Futakawa, M.
Material issues relating to high power
spallation neutron sources
IOP Conf. Series: Materials Science andEngineering, Vol 74, 12001 (2015)
C-010
Ikeda, Y. et al.
Caracterization of Ferromagnetic Order in
CePd2P2
J. Phys.: Conf. Series, Vol 592, 012013 (2015)
C-011
Konno, S. et al.
Intermultiplet transitions in filled
skutterudite SmFe4P12
J. Phys.: Conf. Series , Vol 592, 012029 (2015)
C-012
Yoshida, G. et al.
Muonic atom formation processes forcarbon containing molecules
J. Phys. Conf. Ser. Vol. 635, 052047
C-013
Hamada, E. et al.
The Application of DAQ-Middleware to the
J-PARC E16 Experiment
J. Phys. Conf. Ser. Vol. 664, 082016
C-014
Obara, Y. et al.
Development of GEM trigger electronics
for the J-PARC E16 experiment
J. Phys. Conf. Ser. Vol. 664, 082043
C-015
Takahashi, T. N. et al.
The electronics, online trigger system anddata acquisition system of the J-PARC E16
experiment
J. Phys. Conf. Ser. Vol. 664, 082053
C-016
Kajimoto, R. et al.
Recent progress in the chopper
spectrometer 4SEASONS at J-PARC
JAEA-Conf, Vol 2015-002, 319-329 (2015)
C-017
Nakamura, M. et al.
MAGIC chopper: basic concept andexperimental evaluation
JAEA-Conf, Vol 2015-002, 339-348 (2015)
C-018
Saha, P. K. for the RCS beamcommissioning team
Beam Commissioning Results of the
J-PARC 3-GeV RCS Injection System with
Upgraded 400 MeV BeamJapan Physical Society Conf. Proc., Vol 8,12014 (2015)
C-019
Ikeuchi, K. et al.
Detailed Study of the Phase Diagram of Febased Superconductor Ba(Fe1-xCox)2As2
by Super High-Resolution Neutron
Diffraction Measurements
Journal of Physics, Vol 592, 12071 (2015)
C-020
Sakaguchi, Y. et al.
Dynamics of silver photo-diffusion into
Ge-chalcogenide films: time-resolved
neutron reflectometry
Journal of Physics; Conference Series, Vol
619, 012046 (2015)
C-021
Tomoyori, K. et al.
Background elimination using the SNIP
method for Bragg reflections from aprotein crystal measured by a time-offlight single-crystal neutron diffractometer
Journal of Physics: Conf. Series, Vol 664,
072049-042055 (2015)
C-022
Tatsumoto, H. et al.
Heat Transfer Characteristics of a
Horizontal Wire in Pools of Liquid andSupercritical Hydrogen
Journal of Superconductivity and Novel
Magnetism, Vol 28, 1185-1188 (2015)
C-023
Futakawa, M.
Targetry overview — Various target
concepts and expectable next generation
targets in power frontier applications —JPS Conf. Proc., Vol 8, 001002 (2015)

J-PARC Annual Report 2015

Publications

79
C-024
Miura, A. et al.
Beam monitors for the commissioning ofenergy upgraded linac
JPS Conf. Proc., p.011002_1 - 011002_6 (2015)
C-025
Miura, A. et al.
Bunch shape measurement of 181 MeV
beam in J-PARC linac
JPS Conf. Proc., 8, p.011003_1 - 011003_6 (2015)
C-026
Oguri, H. et al.
Operation status of the J-PARC ion source
JPS Conf. Proc., p.011009_1 - 011009_6 (2015)
C-027
菖蒲田 義博 他
Analytical Estimation of the Field
modulation during the injection period forthe 3GeV RCS in J-PARC
JPS conf. proc., Vol 8, 012003-1 (2015)
C-028
Hotchi, H. et al.
Introducing an 8-GeV Booster Synchrotron
between RCS and MR at J-PARC — One
Possible Option toward a Multi-MW
Output Beam Power from MR
JPS Conf. Proc. Vol 8, 012008 (2015)
C-029
Harada, H. et al.
Optics Tuning for Beam Collimation in the
J-PARC 3-50 Beam Transport LineJPS Conf. Proc., Vol 8, 012010-1 (2015)
C-030
Harada, H. et al
The Residual Gas Ionization Profile
Monitor in the J-PARC 3-GeV Rapid Cycling
Synchrotron
JPS Conf. Proc., Vol 8, 012011-1 (2015)
C-031
Harada, H. et al.
Design of Injection and Extraction at an
8-GeV Booster Ring and the J-PARC Main
Ring for Multi-MW Output Beam PowerJPS Conf. Proc., Vol 8, 012012-1 (2015)
C-032
Hotchi, H.
1-MW Beam Operation Scenario of the
J-PARC 3-GeV Rapid Cycling Synchrotron
JPS Conf. Proc. Vol 8, 012013 (2015)
C-033
Tani, N. et al.
The Realignment of the Beamline for
J-PARC 3GeV RCSJPS Conf. Proc., Vol 8, 012016-1 (2015)
C-034
Ohmori, C. et al.
High Temperature μSR Experiments for

Accelerator Developments
JPS Conf. Proc., Vol 8, 012025 (2015)

Structure
JPS Conf. Proc., Vol 8, 031006 (2015)

C-035
Osawa, T. et al.
Elemental Analysis System with NegativeMuon BeamJPS Conf. Proc., Vol 8, 025003 (2015)

C-045
Maruyama, K. et al.
Neutron Diffraction Study of Isotope
Enriched Glassy Sm4Ti9O24
JPS Conf. Proc., Vol 8, 31007 (2015)

C-036
Kanda, S. et al.
Precision Measurement of Muonium
Hyperfine Splitting at J-PARC andIntegrated Detector System for HighIntensity Pulsed Muon Beam Experiment
JPS Conf. Proc., Vol 8, 025006 (2015)

C-046
Tahara, S. et al.
Two Low-Energy Excitations in Superionic
Conductors of RbAg4I5 and KAg4I5JPS Conf. Proc., Vol 8, 031008 (2015)

C-037
Nakatsugawa, Y. et al.
Silicon Carbide Target for a Muon-Electron
Conversion Search at J-PARC MLF
JPS Conf. Proc., Vol 8, 025013 (2015)
C-038
Kitamura, R. et al.
Studies on Muonium Production from
Silica Aerogel with Substructure for the
Muon g-2/EDM Experiment
JPS Conf. Proc., Vol 8, 025016 (2015)
C-039
Torii, H. A. et al.
Precise Measurement of Muonium HFS at
J-PARC MUSEJPS Conf. Proc., Vol 8, 025018 (2015)
C-040
Harjo, S. et al.
Thermal Strain in Superconducting Nb3Sn
Strand at Cryogenic Temperature
JPS Conf. Proc., Vol 8, 031001 (2015)

C-047
Kawasaki, T. et al.
Dislocation Characteristics of Martensitic
Steel Studied by In-Situ Neutron
Diffraction Experiment
JPS Conf. Proc., Vol 8, 031009 (2015)
C-048
Kiyanagi, R. et al.
Phase Transition and Internal Crystal
Structure of Superprotonic Conductor,
Rb3-xKxH(SeO4)2
JPS Conf. Proc., Vol 8, 31012 (2015)
C-049
Onodera, Y. et al.
Structure and conductivity of Na-P-S
superionic conducting glasses studied byneutron and X-ray diffraction
JPS Conf. Proc., Vol 8, 31013 (2015)
C-050
Su, Y. et al.
Microstructure and Residual Strain
Distribution in Cast Duplex Stainless SteelStudied by Neutron Imaging
JPS Conf. Proc., Vol 8, 31015 (2015)

C-041
Hosokawa, S. et al.
A Combination of Anomalous X-ray
Scattering and Neutron Diffraction
for Structural Characterizations of
Zr45Cu45Ag10Metallic GlassJPS Conf. Proc., Vol 8, 31002 (2015)

C-051
Adipranoto, D. S. et al.
Crystal-Local Structure Analyses for
Cathode LIBs LiNi1−xCoxO2(0 ≤x≤ 1) by
Neutron Diffraction
JPS Conf. Proc., Vol 8, 031017 (2015)

C-042
Furuta, K. et al.
Local Structure of Lithium Ion
Conducting Germanium Sulfide Glass:(Li2S)40(GeS2)60
JPS Conf. Proc., Vol 8, 31004 (2015)

C-052
Arima, H. et al.
Structural Study of Fe80B20 Amorphous
Alloy by Anomalous X-ray Scattering
Coupled with Neutron Diffraction
JPS Conf. Proc., Vol 8, 31019 (2015)

C-043
Harjo, S. et al.
Metastable Austenitic Steel Deformation
at Low Temperature
JPS Conf. Proc., Vol 8, 031005 (2015)

C-053
Kino, K. et al.
Application of the J-PARC Neutron Beamto the Transmission Measurement for a Li
Ion Battery during Charge and Discharge
JPS Conf. Proc., Vol 8, 031021 (2015)

C-044
Suzuki, H. et al.
Application of Neutron StressMeasurement to Reinforced Concrete

C-054
Xu, P. et al.
Progress in Bulk Texture Measurement

Publications

J-PARC Annual Report 2015

80
Using Neutron Diffraction
JPS Conf. Proc., Vol 8, 031022 (2015)
C-055
Sakaguchi, Y. et al.
Measurement of Transient Photo-Induced
Changes in Thin Films at J-PARC — TimeResolved Neutron Reflectivity
Measurements of Silver Photo-Diffusion
into Ge-Chalcogenide Films
JPS Conf. Proc., Vol 8, 031023 (2015)
C-056
Hoshikawa, A. et al.
Structure Analysis of Propane Hydrates
JPS Conf. Proc., Vol 8, 32001 (2015)
C-057
Abe, H. et al.
Size-tunable confined water in a room
temperature ionic liquid
JPS Conf. Proc, Vol 8, 033001 (2015)
C-058
Inagaki, M. et al.
Muonic Atom Formation by Muon Transfer
Process in C6H6 or C6H12 and CCl4 Mixtures
JPS Conf. Proc., Vol 8, 033004 (2015)
C-059
Ninomiya, K. et al.
Elemental Analysis of Bronze Artifacts by
Muonic X-ray Spectroscopy
JPS Conf. Proc., Vol 8, 033005 (2015)
C-060
Pant, A. D. et al.
Hydration Effect on Electron Transfer in
Cytochrome c Monitored by μSR
JPS Conf. Proc., Vol 8, 033007 (2015)
C-061
Sekine, Y. et al.
Neutron Diffraction of Ice and Water inHydrogels
JPS Conf. Proc., Vol 8, 33009 (2015)
C-062
Fukazawa, H. et al.
Properties of Ferroelectric Ice
JPS Conf. Proc., Vol 8, 033010 (2015)
C-063
Akutsu, K. et al.
Structural study of gold nanoparticle/
surfactant complex by SANS, SAXS, TEM,
and EXAFS Techniques
JPS Conf. Proc, Vol 8, 033011 (2015)
C-064
Iwase, H. et al.
SANS and SAXS studies on the aggregatesproperties of a Gemini-type amphiphilic
dendrimer in solution
JPS Conf. Proc, Vol 8, 33012 (2015)

C-065
Azuma, K. et al.
Depth Distribution of Component for theThin Films of Binary Polystyrene Blendswith Different Molecular Weights
JPS Conf. Proc., Vol 8, 033013 (2015)
C-066
Itoh, S. et al.
Science from the initial operation of HRC
JPS Conf. Proc., Vol 8, 034001 (2015)
C-067
Kodama, K. et al.
Local Lattice Distortion Caused by ShortRange Charge Ordering in Transition Metal
OxidesJPS Conf. Proc., Vol 8, 034002 (2015)
C-068
Amemiya, K. et al.
Magnetic Field Dependence of theCanted Spin Moment around theInterface between Ferromagnetic Ni and
Antiferromagnetic FeMn Revealed by the
Polarized Neutron Reflectivity
JPS Conf. Proc., Vol 8, 34004 (2015)
C-069
Ohishi, K. et al.
Relation between Crystallographic andMagnetic Chiralities in a Chiral Helimagnet
CsCuCl3
JPS Conf. Proc., Vol 8, 034006 (2015)
C-070
Lee, S. et al.
Time of Flight Neutron Diffraction on NiO
JPS Conf. Proc., Vol 8, 034007 (2015)
C-071
Ueno, T. et al.
Structural and Magnetic Depth Profile
Analysis of L10 FeNi Film by Polarized
Neutron Reflectometry
JPS Conf. Proc., Vol 8, 034008 (2015)
C-072
Mochiku, T. et al.
Crystal Structure of the Fe1−xSr2YCu2+xO6+δ Magnetic
Superconductor
JPS Conf. Proc., Vol 8, 34009 (2015)
C-073
Nakao, A. et al.
Magnetic and Crystal Structures of
the Room Temperature Ferrimagnet
Sr3YCo4O10.5
JPS Conf. Proc., Vol 8, 034010 (2015)
C-074
Wakimoto, S. et al.
Neutron Scattering Study of Spin
Fluctuations in La2−xSrxCuO4 by FourDimensional Mapping of Neutron CrossSections Using the 4SEASONS Chopper

Spectrometer
JPS Conf. Proc., Vol 8, 034013 (2015)
C-075
Hiroi, K. et al.
Development of AC Magnetic Field
Imaging Technique Using Polarized Pulsed
Neutrons at J-PARC
JPS Conf. Proc., Vol 8, 35001 (2015)
C-076
Harada, M. et al.
Inner Observation of Canning Cadmium
by Energy-Selective Neutron Imaging at
NOBORUJPS Conf. Proc., Vol 8, 35002 (2015)
C-077
Kajimoto, R. et al.
Background Caused by Continuously
Emitted High-Energy Neutrons at the
Chopper Spectrometer 4SEASONSJPS Conf. Proc., Vol 8, 036001 (2015)
C-078
Oikawa, K. et al.
Custom-Made Shutter Block for Imaging
Instrument “RADEN” at J-PARC
JPS Conf. Proc., Vol 8, 036002 (2015)
C-079
Yamada, N. L. et al.
Development of Sample Environments
for the SOFIA Reflectometer for SecondsOrder Time-Slicing Measurements
JPS Conf. Proc., Vol 8, 036003 (2015)
C-080
Tomoyori, K. et al.
Evaluation of the Resolvable Capacity of
Bragg Reflections for a New Diffractometer
at J-PARC/MLF Designed for Protein
Crystals with Large Unit Cells
JPS Conf. Proc., Vol 8, 036004 (2015)
C-081
Segawa, M. et al.
Development of a Three-Dimensional
Computed Tomography System using
High-Speed Camera at a Pulsed Neutron
SourceJPS Conf. Proc., Vol 8, 36006 (2015)
C-082
Ooi, M. et al.
Upgrade of Monitoring and Operation
Systems for the MLF-GCS Base on EPICS
and CSSJPS Conf. Proc., Vol 8, 036007 (2015)
C-083
Kira, H. et al.
Demonstration study of small-angle
polarized neutron scattering using
polarized 3He neutron spin filter
JPS Conf. Proc, Vol 8, 036008 (2015)

J-PARC Annual Report 2015

Publications

81
C-084
Oku, T. et al.
Development of Compact Laser Optics foran In-Situ Spin-Exchange Optical Pumping
3He Neutron Spin Filter
JPS Conf. Proc., Vol 8, 036009 (2015)
C-085
Suzuki, N. et al.
Optimization of Radial Collimators for a
Powder Diffractometer SPICAJPS Conf. Proc., Vol 8, 036010 (2015)
C-086
Nakamura, M. et al.
Oscillating Radial Collimators for the
Chopper Spectrometers at MLF in J-PARC
JPS Conf. Proc., Vol 8, 036011 (2015)
C-087
Ishizuka, K. et al.
Super-Resolution Processing for Pulsed
Neutron Imaging System Using a HighSpeed Camera
JPS Conf. Proc., Vol 8, 36012 (2015)
C-088
Nakatani, T. et al.
The Control Software Framework of the
Web Base
JPS Conf. Proc., Vol 8, 036013 (2015)
C-089
Ito, T. U. et al.
Online Monitoring of Negative Muon
Beam Profiles at J-PARC MUSE using a
Gated Image Intensifier
JPS Conf. Proc., Vol 8, 036014 (2015)
C-090
Sakai, K. et al.
Development Status of the NMR System
for the Polarized 3He Neutron Spin Filter(NSF) in the MLF at J-PARC
JPS Conf. Proc., Vol 8, 36015 (2015)

C-094
Ohshita, H. et al.
New Neutron Beam Monitor Based on GEM
JPS Conf. Proc., Vol 8, 36019 (2015)
C-095
Takata, S. et al.
The design and q resolution of the small
and wide angle neutron scattering
instrument (TAIKAN) in J-PARC
JPS Conf. Proc, Vol 8, 36020 (2015)
C-096
Arai, M. et al.
Present Status of the Materials and Life
Science Experimental Facility of J-PARC
JPS Conf. Proc., Vol 8, 036021 (2015)
C-097
Shibata, K. et al.
The Performance of TOF near
Backscattering Spectrometer DNA in MLF,
J-PARCJPS Conf. Proc., Vol 8, 36022 (2015)
C-098
Satoh. S
Development of a New Exclusive Function
for a 2012 Model 6Li Time Analyzer
Neutron Detector System
JPS Conf. Proc., Vol 8, 51001 (2015)
C-099
Makimura, S. et al.
Present Status of Muon Production Target
at J-PARC/MUSE
JPS Conf. Proc., Vol 8, 051002 (2015)
C-100
Narukami, Y. et al.
Signal from a Single Neutron by using
Current-Biased Kinetic Inductance Detector
made of Superconducting Nb Nanowire
JPS Conf. Proc., Vol 8, 051003 (2015)

C-091
Tampo, M. et al.
The Development of a Non-Destructive
Analysis System with Negative Muon Beamfor Industrial Devices at J-PARC MUSEJPS Conf. Proc., Vol 8, 036016 (2015)

C-101
Miyajima, S. et al.
Time-Dependent Flux from Pulsed
Neutrons Revealed by Superconducting Nb
Current-Biased Kinetic Inductance Detector
with 10B Converter Operated at 4 K
JPS Conf. Proc., Vol 8, 051004 (2015)

C-092
Adachi, T. et al.
Tuning of Ultra-Slow Muon Transport
SystemJPS Conf. Proc., Vol 8, 036017 (2015)

C-102
Haga, K. et al.
Thermal Hydraulic Design of a Doublewalled Mercury Target Vessel
JPS Conf. Proc., Vol 8, 051008 (2015)

C-093
Ohhara, T. et al.
Current Status of an Extreme Environment
Single Crystal Neutron Diffractometer
SENJU at J-PARC
JPS Conf. Proc., Vol 8, 36018 (2015)

C-103
Yamazaki, D. et al.
Neutron Focusing by a Kirkpatrick–Baez
Type Super-Mirror
JPS Conf. Proc., Vol 8, 051009 (2015)
C-104
Sawabe, Y. et al.

BEAM LOSS MITIGATION BY THE
MODIFICATION OF THE BEAM PULSE
DEFINITION IN THE J-PARC
LINAC Proc. of the 12th Annual Meetingof Particle Accelerator Society of Japan,
Tsuruga, Japan p. 1202
C-105
Oda, Y. et al.
Density Profiles of Well-DefinedPoly(methyl 2-propenyl ether) (PMPE) Near
Water Interface
Macromol. Symp., Vol 350, 99 (2015)
C-106
Nakamura, T. et al.
A two-dimensional scintillation-based
neutron detector with wavelength-shifting
fibers and incorporating an interpolation
methodNUCL INSTRUM METH A, Vol 784, 202 (2015)
C-107
Sasa, Toshinobu
Design of J-PARC Transmutation
Experimental Facility
Nuclear Back-end and Transmutation
Technology for Waste Disposal, p.73 - 79 (2015)
C-108
外山 毅 他STATUS OF THE INTRABUNCH-FEEDBACKFEEDBACK AT J-PARC MAIN RING
PASJ2015 proc., 722 (2015)
C-109
Kino, K. et al.
First Imaging Experiment of a Lithium
Ion Battery by a Pulsed Neutron Beam at
J-PARC/MLF/BL09
Physics Procedia, Vol 69, 612-618 (2015)
C-110
Hayashida, S. et al.
Inelastic neutron scattering on
multiferroics NdFe3(BO3)4
Physics Procedia, Vol 75, 127-133 (2015)
C-111
Iwasa, K. et al.
Nd-ion substitution effect on f-electron
multipole order of PrRu4P12
Physics Procedia, Vol 75, 179-186 (2015)
C-112
Fang, Z. et al.
Improvements of Low Level RF Control
Systems for J-PARC LINAC 400-MeV
UpgradeProc. 2nd Int. Symp. Science at J-PARC, Vol 8,011001-1 (2015)
C-113
Miura, A. et al.
Beam Monitors for the Commissioning ofEnergy Upgraded Linac
Proc. 2nd Int. Symp. Science at J-PARC, Vol 8,

Publications

J-PARC Annual Report 2015

82
011002-1 (2015)
C-114
Miura, A. et al.
Bunch Shape Measurement of 181 MeV
Beam in J-PARC Linac
Proc. 2nd Int. Symp. Science at J-PARC, Vol 8,011003-1 (2015)
C-115
Ao, H. et al.
Improvement of Vacuum Pressure in the
Annular-ring Coupled Structures for the
J-PARC Linac
Proc. 2nd Int. Symp. Science at J-PARC, Vol 8,011004-1 (2015)
C-116
Morishita, T. et al.
Properties of the Vertical Deformation of
the J-PARC Linac Tunnel
Proc. 2nd Int. Symp. Science at J-PARC, Vol 8,011006-1 (2015)
C-117
Oguri, H. et al.
Operation Status of the J-PARC Ion Source
Proc. 2nd Int. Symp. Science at J-PARC, Vol 8,011009-1 (2015)
C-118
Hori, T. et al.
Investigation of the Long-Term
Performance of the 324 MHz Klystrons forAchieving the Efficient Operation of the
Linac at J-PARC
Proc. 2nd Int. Symp. Science at J-PARC, Vol 8,011010-1 (2015)
C-119
Tamura, J. et al.
ACS Installation for Beam Energy Upgradein J-PARC Linac
Proc. 2nd Int. Symp. Science at J-PARC, Vol 8,011011-1 (2015)
C-120
Hasegawa, K. et al.
Upgrade and Operation of J-PARC Linac
Proc. 2nd Int. Symp. Science at J-PARC, Vol 8,011012-1 (2015)

C-123
Sugawara, T. et al.
Current activities for research anddevelopment on accelerator-driven
system in JAEA
Proc. of 21st International Conference &Exhibition, p.648 - 656 (2015)
C-124
Miura, A. et al.
Vacuum improvement of bunch shapemonitor for J-PARC linac
Proc. of 3rd International Beam
Instrumentation Conf. (IBIC 2014), p.430 434 (2015)
C-125
Yamamoto, K. et al.
Beam instrumentation at the 1 MW Proton
beam of J-PARC RCS
Proc. of 54th ICFA Advanced Beam Dynamics
Workshop on High-Intensity, High Brightness
and High Power Hadron Beams (HB 2014),
p.278 - 282 (2015)
C-126
Tamura, J. et al.
Charge State Selective Ion Beam
Acceleration with RF Linac
Proc. of HIAT2015, 216 (2015)
C-127
Tejima, M.
BEAM BASED CALIBRATION FOR BEAM
POSITION MONITORS
Proc. of IBIC2015, Melbourne, Australia p. 266
C-128
Miura, A. et al.
BUNCH LENGTH ANALYSIS OF NEGATIVEHYDROGEN ION BEAM IN J-PARC LINAC
Proc. of IBIC2015, Melbourne, Australia p. 386
C-129
Morino, Y. et al.
UPGRADE OF THE BEAM MONITORSYSTEM FOR HADRON EXPERIMENTAL
FACILITY AT J-PARC
Proc. of ICALEPCS2015, Melbourne, Australia
p. 86

C-121
Yamazaki, S. et al.
Development Status of Ion Source at
J-PARC Linac Test Stand
Proc. 2nd Int. Symp. Science at J-PARC, Vol 8,011014-1 (2015)

C-130
Nakayoshi, K. et al.
UPGRADE OF THE CONTROL AND
INTERLOCK SYSTEMS FOR THE MAGNET
POWER SUPPLIES IN THE T2K PRIMARYBEAMLINE
Proc. of ICALEPCS2015, Melbourne, Australia
p. 160C-122
Kikuzawa, N. et al.
Status of operation data archiving systemusing Hadoop/HBase for J-PARC
Proc. of 10th International Workshop
on Personal Computers and Particle
Accelerator Controls (PCaPAC 2014), p.193 195 (2015)

C-131
Sato, K. C. et al.
THE CONTROL SYSTEM FOR TRIM-COIL
RELAY-SELECTORS IN J-PARC MR
Proc. of ICALEPCS2015, Melbourne, Australia
p. 353

C-132
Agari, K. et al.
UPGRADES OF TEMPERATURE
MEASUREMENTS AND INTERLOCK SYSTEMFOR THE PRODUCTION TARGET AT J-PARC
HADRON EXPERIMENTAL FACILITY
Proc. of ICALEPCS2015, Melbourne, Australia
p. 371
C-133
Miura, A. et al.
INTERLOCK OF BEAM LOSS AT LOWENERGY PART OF J-PARC LINAC
Proc. of ICALEPCS2015, Melbourne, Australia
p. 405
C-134
Ohmi, K.
THEORY AND SIMULATION OF EMITTANCEGROWTH CAUSED BY SPACE CHARGE AND
LATTICE INDUCED RESONANCES
Proc. of ICAP2015, Shanghai, China p. 151
C-135
Ohmori, C. et al.
DEVELOPMENT OF HIGH GRADIENT RFSYSTEM FOR J-PARC UPGRADE
Proc. of IPAC2015, Richmond, VA, USA p. 50
C-136
Ohmi, K.
STUDY OF EMITTANCE GROWTH CAUSEDBY SPACE CHARGE AND LATTICE INDUCEDRESONANCES
Proc. of IPAC2015, Richmond, VA, USA p. 245
C-137
Artikova, S. et al.
SPACE CHARGE SIMULATION AND
MATCHING AT LOW ENERGY SECTION OF
J-PARC LINAC
Proc. of IPAC2015, 251 (2015)
C-138
菖蒲田 義博 他
MEASUREMENT RESULTS OF THE
IMPEDANCE OF THE RF-CAVITY AT THE RCS
IN J-PARC
proc. of IPAC 2015, 255 (2015)
C-139
Kuboki, H. et al.
BEAM BASED GAIN CALIBRATION FOR
BEAM POSITION MONITOR AT J-PARC
MAIN RING
Proc. of IPAC2015, Richmond, VA, USA p. 927
C-140
Nakamura, K. G. et al.
DEVELOPMENT OF WIDEBAND BPM FOR
PRECISE MEASUREMENT OF INTERNALBUNCH MOTION
Proc. of IPAC2015, Richmond, VA, USA p. 937
C-141
Hotchi, H.
Recent progress of J-PARC RCS beam

J-PARC Annual Report 2015

Publications

83
commissining - Toward realizing the 1-MW
output beam power
Proc. of IPAC2015, 1346 (2015)
C-142
Yoshida, M. et al.
RE-ACCELERATION OF ULTRA COLD MUON
IN J-PARC MLF
Proc. of IPAC2015, Richmond, VA, USA p. 2532
C-143
Otani, M. et al.
DEVELOPMENT OF MUON LINAC FOR THE
MUON G-2/EDM EXPERIMENT AT J-PARC
Proc. of IPAC2015, Richmond, VA, USA p. 2541
C-144
Fang, Z. et al.
LOW LEVEL RF SYSTEMS FOR J-PARC LINAC
50-mA OPERATION
Proc. of IPAC2015, Richmond, VA, USA p. 2889
C-145
Takayanagi, T. et al.
NEW INJECTION BUMP POWER SUPPLY OF
THE J-PARC RCS
Proc. of IPAC2015, Richmond, VA, USA p. 2908
C-146
Kamiya, J. et al.
DEGASSING OF KICKER MAGNET BY INSITU BAKE-OUT METHOD
Proc. of IPAC2015, 2911 (2015)
C-147
Liu, Y. et al.
STABILITY STUDIES FOR J-PARC LINACUPGRADE TO 50mA/400MeV
Proc. of IPAC2015, Richmond, VA, USA p. 3785
C-148
Maruta, T. et al.
RECENT PROGRESS OF THE BEAM
COMMISSIONING IN J-PARC LINAC
Proc. of IPAC2015, Richmond, VA, USA p. 3789
C-149
Saha, P. K. et al.
PRELIMINARY STUDIES OF LASERASSISTED H− STRIPPING AT 400 MeV
Proc. of IPAC2015, Richmond, VA, USA p. 3795
C-150
Kondo, Y. et al.
SIMULATION STUDY OF MUONACCELERATION USING RFQ FOR A NEW
MUON G-2 EXPERIMENT AT J-PARC
Proc. of IPAC2015, Richmond, VA, USA p. 3801
C-151
Tanaka, K.
Present Status and Future Plans of J-PARC
Hadron Experimental Facility
Proc. of NRM2015, Villa Monastero, Varenna,
Italy p. 331

C-152
Konstantinova, O. et al.
Scintillating fiber detector for the beamloss proton measurements at J-PARC linac
Proc. of Science (2015)
C-153
Nakatsugawa, Y.
Search for muon to electron conversion at
J-PARC MLF : Recent status on DeeMe
PROC. of SCIENCE(NUFACT2014), 93 (2015)
C-154
Zambelli, L.
Flux and neutrino interaction model
constraints using the T2K near detectors
Proc. of Science, EPS-HEP 2015, 058
C-155
Blondel, A. et al.
The WAGASCI experiment at J-PARC tomeasure neutrino cross-sections on water
Proc. of Science, EPS-HEP 2015, 292
C-156
Nishiguchi, H.
COMET experiment: –A search for muonto-electron conversion at J-PARC–
Proc. of Science, EPS-HEP 2015, 585
C-157
Teshima, N. et al.
Development of a high-rate tolerantHV-switching multi-wire proportional
chamber and its readout electronics for
DeeMe experimentProc. of Science, FPCP 2015, 061
C-158
Nagao, D. et al.
After-Proton background estimation for
DeeMe experimentProc. of Science, FPCP 2015, 062
C-159
Mineev, O. et al.
A Spiral Fiber Tracker for the J-PARC E36
experimentProc. of Science, PhotoDet 2015, 069
C-160
Kuboki, H. et al.
BEAM BASED GAIN CALIBRATION FOR
BEAM POSITION MONITOR AT J-PARC
MAIN RING
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 25
C-161
Chin, Y. H. et al
A TWO PARTICLE MODEL FOR STUDY OF
EFFECTS OF SPACE-CHARGE FORCE ON
BEAM INSTABILITIES
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 43

C-162
Otani, M. et al.
DEMONSTRATION OF MUONACCELERATION AND CAVITY DESIGN OF
THE MUON LINAC FOR J-PARC E34
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 56
C-163
Akutsu, K. et al.
Study of a Corrosion Resistant Coating
Layer for Metal Magnetic Cores Using
Neutron Reflectometry
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, 72-76 (2015)
C-164
發知 英明
J-PARC RCSのビームコミッショニングの近況報告 - 1-MW設計出力の実現に向けて Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, 103 (2015)
C-165
Shibata, T. et al.
THE DEVELOPMENT OF NEW INJECTIONSEPTUM MAGNET FOR UPGRATE OF
J-PARC MR
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 115
C-166
Shirakabe, Y. et al.
STUDY OF THE ‘INTRINSIC RIPPLES’ IN
SYNCHROTRON
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 120C-167
Kawabata, Y. et al.
RADIATION DAMAGE STUDY OF THE
POSITIONING SENSOR NETWORK SYSTEMIN HIGH RADIATION ENVIRONMENT
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 125
C-168
Okumura, Y. et al.
Progress of the high current Prototype
Accelerator for IFMIF/EVEDA
Proc. of 12th Annual Meeting of Particle
Accelerator Society of Japan, p.203 - 205(2015)
C-169
Nakagawa, H. et al.
THE INTRODUCTION OF THE J-PARC MR
MPS EQUIPMENT, AND THE DISCUSSION
OF THE INTEREST CONCERNING THE
EQUIPMENT
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 215

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J-PARC Annual Report 2015

84
C-170
Makimura, S. et al.
PRESENT STATUS OF MUON ROTATINGTARGET AT J-PARC/MUSE
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 261
C-171
Maruta, T. et al.
RECENT PROGRESS OF BEAM STUDY IN
THE J-PARC LINAC
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 432
C-172
Igarashi, S. et al.
THIRD ORDER RESONANCE CORRECTION
IN J-PARC MR
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 437
C-173
Shirakata, M. et al.
RESPONSE AND BEAM LOSS DISTRIBUTION
DUE TO THE J-PARC MR COLLIMATORS
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 441
C-174
Sato, Y. et al.
RECENT COMMISSIONING AND PROSPECT
OF HIGH POWER BEAM OPERATION OF
THE J-PARC MAIN RING
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 488
C-175
Shinto, K. et al.
Present status of the injector for IFMIF
Linear Prototype Accelerator (LIPAc)
Proc. of 12th Annual Meeting of Particle
Accelerator Society of Japan, p.493 - 495(2015)
C-176
Tamura, F. et al.
DEVELOPMENT OF HIGH POWER BALUNSUSING MA CORES (2)Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 639C-177
Hori, T. et al.
REDUCTION IN THE FAULT RATE OF HIGH
VOLTAGE POWER SUPPLY FOR KLYSTRONSBY USING VETO CIRCUIT IN THE J-PARC
LINAC
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 643

C-178
Sawamura, Y. et al.
A DEVELOPMENT OF BIPOLAR INDUCTIONVOLTAGE ADDERS DRIVEN BY MOS-FETS
BASED MARX GENERATORS FOR J-PARC
MUON BEAM KICKER
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 694C-186
Kimura, T. et al.
THE ABNORMALITY OCCURRENCE OF MRMPS DEVICE AND COUNTERMEASURE IN
J-PARC
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 770C-179
Toyama, T. et al.
RESIDUAL RADIATION MEASUREMENTWITH THE BLMS IN J-PARC MR
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 719C-187
Kamikubota, N. et al.
EXPERIENCES OF COMMERCIALAMPLIFIERS FOR J-PARC MR MAGNET
POWER-SUPPLIES
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 774C-180
Toyama, T. et al.
STATUS OF THE INTRABUNCH-FEEDBACKFEEDBACK AT J-PARC MR
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 722

C-188
Sato, K. et al.
EPICS CONTROL SYSTEM FOR TRIM-COIL
RELAY-SELECTORS IN J-PARC MR
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 777

C-181
Toyama, T. et al.
LARGE RESIDUAL RADIATION BUT SMALL
BEAM LOSS SIGNAL AT J-PARC MR
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 725

C-189
Aoyama, T. et al.
SUMMARY ALARM GUI “RADACCSAFETY”
FOR J-PARC RADIATION-MONITORSURVEILLANCE
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 787

C-182
Hatakeyama, S. et al.
MEASUREMENT OF RESPONSE MATRIXFOR INJECTION ERROR CORRECTION OF
J-PARC MR
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 742

C-190
Okabe, K. et al.
TWISS PARAMETER MATCHING OF THE
INJECTION BEAM FOR THE J-PARC RCS
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japanp. 933

C-183
Usami, H. et al.
Development status of data acquisition
system for IFMIF/EVEDA accelerator
Proc. of 12th Annual Meeting of Particle
Accelerator Society of Japan, p.760 - 763(2015)

C-191
Hirano, K. et al.
DEVELOPMENT OF RF CHOPPER SYSTEMAT J-PARC LINAC(2)Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japanp. 944

C-184
Kawase, M. et al.
Development of accelerator device control
system using the machine model
Proc. of 12th Annual Meeting of Particle
Accelerator Society of Japan, p.764 - 766(2015)

C-192
Hasegawa, K. et al.
DEVELOPMENT OF THE RF CAVITY WITH
FT3L MA CORES (2015)
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 951

C-185
Yamada, S. et al.
DEPLOYMENT OF CONTROL SYSTEMSTUDIO AT J-PARC MAIN RING
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 767

C-193
Sugimura, T. et al.
THE HEAT TRANSFER ANALYSIS FOR A
NEW LARGE ENTRY ANGLED SCRAPER FOR
J-PARC LINAC
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 954

J-PARC Annual Report 2015

Publications

85
C-194
Nakamura, K. et al.
MEASUREMENT BETATRON AMPLITUDE
FUNCTION DURING ACCELERATION IN
J-PARC MAIN RING
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 958C-202
Morita, Y. et al.
DEVELOPMENT OF NPC CHOPPER FORQUADRUPOLE MAGNETS AT STRAIGHTSECTION IN J-PARC MR
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1156

C-210
Miyao, T. et al.
IMPROVEMENT OF THE VACUUM
PRESSURE OF THE BUNCH SHAPEMONITOR AT J-PARC LINAC
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1338

C-195
Yamamoto, M. et al.
BEAM LOSS CAUSED BY ODD HARMONICS
OF BEAM LOADING IN J-PARC RCS
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1008

C-203
Takayanagi, T. et al.
NEW INJECTION BUMP POWER SUPPLY OF
THE J-PARC RCS
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1169

C-211
Uota, M. et al.
VACUUM DUCTS MODIFICATION TO SHAPE
AND MATERIAL IN J-PARC MR
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1342

C-196
Ohkoshi, K. et al.
STATUS OF THE J-PARC RF ION SOURCE
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1040

C-204
Sawabe, Y. et al.
Beam loss mitigation by the modificationof the beam pulse definition in the J-PARC
LINAC
Proc. of 12th Annual Meeting of Particle
Accelerator Society of Japan, p.1202 - 1205
(2015)

C-212
Okada, M. et al.
ABOUT INFLUENCE OF A BEAM TO A DLC
COATING
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1347

C-197
Takahashi, H. et al.
DEVELOPMENT OF INDIRECTLY WATERCOOLED PRODUCTION TARGET AT J-PARC
HADRON EXPERIMENTAL FACILITY
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1045
C-198
Nomura, M. et al.
STUDY OF SHUNT IMPEDANCE OF THE
FT3L MAGNETIC ALLOY CORE
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1096
C-199
Nemoto, Y. et al.
OPERATING STATUS OF THE ACS IN THE
J-PARC LINAC
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1101
C-200
Miura, K. et al.
DEVELOPMENT OF THERMOSTATIC UNIT
FOR NEW MAGNET POWER SUPPLY AT
J-PARC MR
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1149
C-201
Shimogawa, T. et al.
DEMONSTRATION OF PROTOTYPE POWER
SUPPLY OF J-PARC MAIN RING MAIN
MAGNETS FOR HIGH REPETITION RATEOPERATION
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1152

C-205
Hayashi, N. et al.
Optics model determination for BeamBased Alignment of the J-PARC RCS
Proc. of 12th Annual Meeting of Particle
Accelerator Society of Japan, p.1206 - 1209
(2015)

C-213
Hirose, E. et al.
DEVELOPMENT OF A SHIELD PENETRATION
SIGNAL CABLE DUCTS FOR J-PARC
HADRON EXPERIMENTAL HALL
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1393

C-206
Agari, K. et al.
UPGRADE OF TEMPERATURE
MEASUREMENT SYSTEM FOR BEAM DUMPAT J-PARC HADRON EXPERIMENTAL HALL
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1243

C-214
Iwasaki, R. et al.
AIRTIGHT REINFORCEMENT OFSECONDARY BEAMLINE OPENINGS AT
J-PARC HADRON EXPERIMENTAL FACILITY
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1398

C-207
Futatsukawa, K. et al.
DEVELOPMENT OF BUNCH SHAPEMONITOR AT J-PARC LINAC
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1246

C-215
Kasugai, Y.
Safety Measures for the Operation of theMaterials and Life Science Experimental
Facility (MLF) of J-PARC - Restart of MLF
Operation from the Radioactive Material
Leak Incident at the Hadron Experimental
Facility Proc. of the 21st Meeting of the International
Collaboration on Advanced Neutron
Sources, 567 (2016)

C-208
Ikeda, H. et al.
Improvement of the J-PARC operation dataarchiver using HBase/Hadoop
Proc. of 12th Annual Meeting of Particle
Accelerator Society of Japan, p.1312 - 1316
(2015)
C-209
Futatsukawa, K. et al.
DEVELOPMENT OF PHASE ROTATIONSYSTEM FOR RF-CHOPPER J-PARC LINAC
Proc. of the 12th Annual Meeting of Particle
Accelerator Society of Japan, Tsuruga, Japan
p. 1317

C-216
Meigo, S. et al.
Beam profile monitor at the 1 MW
spallation neutron source
Proc. of the International Beam
Instrumentation Conf. IBIC2015, 617 (2015)
C-217
Xiong, Z. et al.
Mechanical Property Change in the Regionof Very High-cycle Fatigue
Procedia Engineering, Vol 101, 552-560 (2015)

Publications

J-PARC Annual Report 2015

86
C-218
Ajimura, S. et al.
On-site background measurements for the
J-PARC E56 experiment: A search for thesterile neutrino at J-PARC MLF
Prog. Theor. Exp. Phys., Vol 6, 063C01 (2015)
C-219
Terada, K. et al.
Measurement of neutron capture crosssections of Pd-107 at J-PARC/MLF/ANNRI
Progress in Nuclear Energy, Vol 82, 118-121(2015)
C-220
Hasegawa, K.
PROGRESS OF BEAM INTENSITY IN THE
J-PARC ACCELERATORS第 12回 日本加速器学会年会プロシーディン

グス , 5 (2015)

C-221
Otani, M. et al.
DEMONSTRATION OF MUONACCELERATION AND CAVITY DESIGN OF
THE MUON LINAC FOR J-PARC E34
第 12回 日本加速器学会年会プロシーディン
グス , 56 (2015)
C-222
Hirano, K. et al.
DEVELOPMENT OF RF CHOPPER SYSTEMAT J-PARC LINAC （２）
第 12回 日本加速器学会年会プロシーディン
グス , 944 (2015)

DEVELOPMENT OF A PROTONACCELERATOR FOR OIST BNCT
第 12回 日本加速器学会年会プロシーディン
グス , 948 (2015)
C-224
Miura, A. et al.
Report on IBIC2014; The 3rd International
Beam Instrumentation Conference
加速器 , p.234 - 238 (2015)
C-225
Omori, T. et al.
Radiation Tolerance Test of the Rotation
Vacuum Seal for the J-Parc Beam Scraperand the ILC Positron Source
高崎量子応用研究所 研究年報 2015 (2015)

C-223
Kondo, Y. et al.

(E) KEK Reports
D-001
Safety Division J-PARC Center Annual
Report on the Activities of Safety in J-PARC,
FY2014KEK Internal 2015-5

D-002
Asai, T. et al.
J-PARC Annual Report 2014
KEK Progress Report 2015-5

D-003
Abramishvili, R. et al.
COMET Phase-1 Technical Report
KEK Report 2015-1

Butsuri Vol. 70, No. 9, p. 694

Upgrade of the J-PARC Linac
Kasokuki Vol. 12, No. 1, p. 22(F) Others
F-001
Nakamura, K.
Nishina Memorial Prize: Takashi Kobayashi,
Tsuyoshi Nakaya
Butsuri Vol. 70, No. 3, p. 220
F-002
Road to J-PARC from JRR2(50 years’ history
for neutron scattering research activity inJapan)

F-003
Mihara, S.
Trends : Search for New Physics Using
Charged-Lepton Rare Decays
Butsuri Vol. 70, No. 10, p. 740

F-005
Yamane, I.
Conversion of J-PARC RCS to 3-GeV
Compressor with Laser Stripping Injection
Kasokuki Vol. 12, No. 1, p. 31

F-004
Morishita, T. et al.

(J) JAEA Reports
J-001
岩元 大樹 他
核変換物理実験施設を用いた炉物理実験
による加速器駆動核変換システム炉物理
パラメータの不確かさ低減効果
JAEA-Research 2014-033, Vol 54 (2015)

J-002
Sugawara, T. et al.
Conceptual study of transmutation
experimental facility, 5; Investigation of
MA fuel handling
JAEA-Technology 2014-044 (2015)

J-003
Kasugai, Y. et al.
Measurement of High-energy Neutron
Fluxes and Spectra aroud the J-PARC
Mercury Spallation Neutron Target using
Multi-foil Activation Method
JAEA-Data/Code 2015-033, 1 (2016)

J-PARC Annual Report 2015
Vol.1: Highlight(C) J-PARC Center
March 2017

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