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

IbarakiJ-PARC ANNUAL REPORT 2019Japan Proton Accelerator Research Complex

Tokai

JR Joban L ine

Mito
Mt.Tsukuba

Pacific Ocean

Tokyo

Vol.1: Highlight

J-PARC

Tokyo

0

20

Vol.1: Highlight40km

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http://j-parc.jp/

J-PARC Center

J-PARC 20-01

REPORT2 O 1 9

NaritaUeno

ANNUAL

Editorial Board (April 2020 – March 2021)

Pranab SAHA (Accelerator Division)

Takayuki YAMAZAKI (Materials and Life Science Division)

Yoshiaki FUJII (Particle and Nuclear Physics Division)

Makoto YOSHIDA (Particle and Nuclear Physics Division)

Shigeru SAITO (Transmutation Division)

Fumihiro SAITO (Safety Division)

Shinji NAMIKI (Users Office Team)

Naomi EBISAWA (Public Relations Section)

Photograph : Person in Tank
Image credit : Yasuhiro MAKIDA

Cover photographs
Photograph ① : Sample alignment for neutron experimentImage credit: Stefanus HARJO

Photograph ② : The Lead Glass Calorimeter for J-PARC E16
Image credit: Sakiko ASHIKAGA

Photograph ③ : Abyss
Image credit: Taihei ADACHIJ-PARC Annual Report 2019Vol.1: Highlight© J-PARC Center
January 2021

J-PARC Annual Report 2019
Contents
Preface……………………………………………………………………………………………………………… 1
Accelerators………………………………………………………………………………………………………… 3
Overview of the Accelerator…………………………………………………………………………………… 3
Linac ………………………………………………………………………………………………………… 6
RCS…………………………………………………………………………………………………………… 9
MR………………………………………………………………………………………………………… 12
Materials and Life Science Experimental Facility………………………………………………………………… 15
Overview…………………………………………………………………………………………………… 15
Neutron Source Section…………………………………………………………………………………… 16
Neutron Science Section…………………………………………………………………………………… 17
Neutron Device…………………………………………………………………………………………… 18
Muon Section……………………………………………………………………………………………… 19
Technology Development Section………………………………………………………………………… 20
Particle and Nuclear Physics……………………………………………………………………………………… 23
Neutrino Experiment……………………………………………………………………………………… 23
Hadron Experimental Facility……………………………………………………………………………… 24
Strangeness / Hadron Physics Experiments ………………………………………………………………… 25
Kaon Decay Experiment…………………………………………………………………………………… 25
Muon Experiments………………………………………………………………………………………… 25
Highlight: T2K data place the strongest constraint
on the leptonic CP violating phase in neutrino oscillation………………………………………………… 26
Cryogenics Section ……………………………………………………………………………………………… 29
Overview…………………………………………………………………………………………………… 29
Cryogen Supply and Technical Support…………………………………………………………………… 30
Superconducting Magnet System for T2K………………………………………………………………… 30
Superconducting Magnet Systems at the MLF…………………………………………………………… 31
Superconducting Magnet Systems at the HEF …………………………………………………………… 31
R&D for the Future Projects at J-PARC……………………………………………………………………… 32
Information System……………………………………………………………………………………………… 33
Overview…………………………………………………………………………………………………… 33
Status of Networking……………………………………………………………………………………… 33
Internet Connection Services for Visitors and Public Users of J-PARC……………………………………… 35
Status of Computing ……………………………………………………………………………………… 36

Transmutation Studies…………………………………………………………………………………………… 39
Overview…………………………………………………………………………………………………… 39
Research and development ……………………………………………………………………………… 40
International cooperation ………………………………………………………………………………… 44
Safety ……………………………………………………………………………………………………………… 47
Safety……………………………………………………………………………………………………… 48
User Service ……………………………………………………………………………………………………… 51
Users Office (UO)…………………………………………………………………………………………… 52
User Statistics……………………………………………………………………………………………… 54
MLF Proposals Summary - FY2019………………………………………………………………………… 55
J-PARC PAC Approval Summary for the 2019 Rounds……………………………………………………… 57
Organization and Committees…………………………………………………………………………………… 59
Organization Structure……………………………………………………………………………………… 60
Members of the Committees Organized for J-PARC………………………………………………………… 61
Main Parameters ………………………………………………………………………………………………… 67
Events ……………………………………………………………………………………………………………… 69
Events……………………………………………………………………………………………………… 69
Publications……………………………………………………………………………………………………… 75
Publications in Periodical Journals………………………………………………………………………… 76
Conference Reports and Books…………………………………………………………………………… 84
KEK Reports………………………………………………………………………………………………… 91
JAEA Reports……………………………………………………………………………………………… 91
Others……………………………………………………………………………………………………… 91

J-PARC Annual Report 2019

Preface1

Preface
We are facing an extraordinary crisis of human life with the new coronavirus which isstill spreading all over the world. We hope you and your loved ones are in good health.
In many countries, non-essential activities have been postponed and people are asked
to stay home or even more severe regulations are enforced. In Japan, a national state of
emergency was raised back in April, 2020. Consequently, we have decided to pause theoperation of entire J-PARC facility as of April 20th, especially to contribute to subsiding
the spread by staying home, hence, a reduction of contact chances.
We were able to resume the facility operation of Material and Life science
experimental Facility (MLF) in mid-May. The hadron experimental facility (HEF) was able
to start its upgraded operation which was delayed by the corona-related slowing downin the regulation review process. While the user’s presence at the facility were not fully
recovered, we were able to conclude the operation before summer shutdown with thesuccessful 1 MW operation at MLF. Scientific outcome of this period will be reported in
the next annual report.
While the challenges still remain, we think it is important to resume the research
activities not only to maintain the research itself as an irreducible part of humancivilization, but also to learn about an operation of a research facility like ours in thePreface

J-PARC Annual Report 20192

similar situations possibly coming back again in the near future. Of course, it is extremely
important to protect society against further spread of infections and secure staff andusers from risks of infections. Therefore, we continue to reinforce the counter measures
based on the best possible knowledge obtained to date. At the same time, the scientificresearch activity is undoubtedly important not only for an immediate benefit, but also
for the incubation of novel ideas and fostering the next generations with scientificcompetence. Along this line, we are open for any research interests directly or indirectly
related to COVID-19 at our facility.
While we were forced to stay home and keep distance from others in the last several
months, I think everybody recognizes how important to cooperate with each other,share ideas, and even disagree sometimes.
Therefore, keep in touch, and stay connected towards the society with resilience,
which can be accelerated by the research facilities like J-PARC.
In this volume, we report the progress made at J-PARC in fiscal year 2019, from April
2019 through March 2020. The neutrino group has established a significant constraint
on the CP phase. The hadron experimental facility is now equipped with the new target
system which can handle more beam power, and a new beamline, B-Line to receive a
primary proton beam. The MLF is provided with more robust targetry for neutron andmuon, and new instruments e.g. T0 chopper to produce increasing number of resultswith users from academic and industrial sectors, which are reported in the separated
volume.
Even under pandemic, our slogan does not change, however, it now implies deeper
engagements towards the future of our world.
“High power beams for the next stage of our life!”

Naohito SAITO
On behalf of the J-PARC staff members,
Director of J-PARC Center

Main Ring synchrotron

Accelerators

Overview of the Accelerator
The J-PARC accelerator complex consists of a 400
MeV linac, a 3 GeV Rapid Cycling Synchrotron (RCS)
and a Main Ring Synchrotron (MR, 30 GeV). The proton
beam from the RCS is delivered to the Materials andLife Science Experimental Facility (MLF) for neutron andmuon experiments as well as injected to the MR. The
MR has two beam extraction modes: fast extraction (FX)
mode for the Neutrino experimental facility (NU) andslow extraction (SX) mode for the Hadron experimental

facility (HD).
The operation in FY 2019 is illustrated in Fig. 1. The
topics related to the beam operation are as follows:(1) Operation for the MLF
After the replacement of the ion source at the endof March, we started a new Run #82. We delivered beam
for the MLF user operation at a beam power of 500 kW.
The user operation for the MLF ended in the morning

Fig. 1. Accelerator operation in FY 2019 (overlapping with the end of FY 2018).

Accelerators

J-PARC Annual Report 20194of July 3. From April, the operation ran smoothly witha high beam availability at about 96%. We used theremaining time for accelerator study until the morning of July 8 and then the operation was stopped forthe summer shutdown. In the beginning of the study
time, we successfully delivered a 1-MW power beam to
the MLF for more than 10 hours. The linac, the RCS, andthe neutron target were very stable during this 1-MW
operation. We had only three short beam stops, and theavailability was as high as 99%. In the previous year, wedemonstrated a 1-MW operation for 1 hour. This year,
we managed to maintain a longer operation and accumulated experiences necessary to attain the design
goal of continuous operation with 1-MW beam power
to the MLF.
The linac peak current was kept to its nominal valueof 50 mA, but was also increased to more than 60 mA
during high power studies to reach a beam power ofover 1.5 MW in the RCS.
We had the usual 2-week shutdown period fromthe end of December until the beginning of January.
The linac tuning started on January 9 followed by the
RCS and MR tuning. The MLF user program started on
January 14 and continued until the end of March, asscheduled.
(2) Operation of the MR for the Neutrino Experiment(FX mode) and Hadron Experiment (SX mode)
The failure of the bending magnet (B51D), which
occurred in March, at the beam transport of RCS to theMR, was patched up and the beam operation stopped.
The beam operation for the HD resumed on April
4 with a beam power of 51 kW, the value before thesuspension. But on April 24, it was observed that thefield strength of the B51D has dropped by 2%, a much
more severe loss than that in March. After investigation,
we found insufficient insulation between conductors
in coils. As a result, we concluded that maintaining astable operation of the MR would be difficult without
replacement of the failed coil. It was replaced during
the summer shutdown period and the user operationof the MR was resumed in the beginning of November.
On November 4, the beam delivery to the NU was
resumed at a beam power of 400 kW. After fine tuningof the MR, we delivered around 490 kW beam power, alevel similar to the one in the previous operation. Afterthe New Year’s holiday, further beam loss mitigationin the MR was achieved with fine tuning of the beam.
As a result, the beam power to the NU operation wasincreased to 515 kW. We expected a change from the
NU operation to beam tuning for the HD in mid-February. But the licensing for a new target and a new beamline in the HD was delayed, so the beam operation was
postponed.
The operation statistics for FY 2019 (from April 2019
to March 2020) are shown in Table 1 and Fig. 2. The total
operation time amounted to 5,800 hours. It included
the on-duty time of the shift leaders at the control room,
as well as the startup and RF conditioning. The net user
operation hours and the beam availability rate for eachexperimental facility were as follows: 3,488 hours (95%)
for MLF; 1,295 hours (90%) for NU; and 355 hours (80%)
for HD. These statistics show that the linac and the RCS
operated properly. The low availability for the HD wascaused by the B15D trouble in March 2019.
The downtime by components is shown in Fig. 3.
There were several causes of the downtime. Over thelast few years, we have taken many countermeasuresagainst troubles at the linac: stabilization of the coolingwater flow, inside cleaning of some SDTL cavities, andreplacement of old bias power supplies for the klystronhigh voltage power supply system (HVDC). The HVDC
down time was still a little long, due to a failure of theold 324-MHz klystron. This year, we also experienced a
shutdown for several hours caused by an antenna failure at the ion source.
There were no serious downtime events in the RCS
and the beam operation was almost stable throughout
the year.
The MR had only one serious downtime event,which was the trouble of the B15D magnet included in
the “Others” category.
Most of the improvement and upgrade work was
carried out during the summer shutdown. Specificimprovements, major downtime causes, and beam
power history are described in further chapters.

J-PARC Annual Report 2019

Accelerators

5
Table 1. Operation statistics in hours for FY 2019. Figures in the parentheses in trouble columns show the loss time contributions as a percentage.
Facility

User Time(hours)Trouble, Acc.only(hours)Trouble, Faculty.only(hours)Net Time(hours)Availability, Total
(%)

MLF

3,656

155 (4.3%)

12 (0.3%)

3,488

95.4

Neutrino
(FX)

1,434

121 (8.4%)

17 (1.2%)

1,295

90.3

Hadron(SX)

445

88 (19.8%)

1 (0.3%)

355

79.8

For MLF users

For MR users
LINAC / RCS
Tuning, Study, 809

Startup, etc. (1),1010

Trouble (Acc), 155
Trouble (Exp), 12

LINAC / RCS
Tuning, Study, 785

Trouble,23

LINAC / RCS
Tuning, Study, 785
350BT / MR / FX / SX
Tuning, Study, 353

3NBT / MLF
Tuning, Study, 323

Trouble,23

3NBT / MLF
Tuning, Study, 309

Trouble,13
MLF users
3488

LINAC / RCS
Tuning, Study, 809

350BT / MR / FX / SX
Tuning, Study, 348

Trouble, 4Startup, etc. (2)2756

NU users,
1295

Trouble (Acc), 88
Trouble (Exp), 1

NU users (Tot),
1434

Trouble (Acc),
121

Trouble (Exp),18
HD users,
355

MLF users (Tot),
3656

HD users (Tot),
445

Fig. 2. Operation statistics for FY 2019. The total operation time was 5,800 hours.

Fig. 3. Downtime by components in FY 2019.

Accelerators

J-PARC Annual Report 2019

6

Linac

Fig. 1. Operation history of the ion source in FY2019.

Overview
The J-PARC linac has been operated with a nominal peak beam current of 50 mA. High availabilityof approximately more than 95% (to the MLF) was
achieved during FY2019 at the linac. Two 10-hour long
beam stop events occurred due to the failure of an ion
source and a klystron power supply. The number oftrips due to the RFQ was still higher than that of othercomponents.
Accelerator components status
The operation history of the ion source in FY 2019is shown in Fig.1. Presently, the ion source is being
operated with a beam current of 60 mA for the user
operation. At the end of RUN#82 and RUN#83, the ion
source extracted stable 72 mA beams for high-intensity
beam studies at the linac. in RUN#82, unscheduled ion
source replacement was performed due to an antenna
malfunction during the operation. An investigation
established that the malfunction was most likely causedby the coating on the antenna surface breaking due
to the collision of heavy ions, because a vacuum leak
was detected during a vacuum fitting of the antenna
feedthrough. In order to prevent a recurrence of thisissue, we have decided to replace the fitting with a newone when we perform a full maintenance of the ion
source.

Figure 2 shows the time variation of number of RFQ

trips. The RFQ trip rate was typically 9 times per day
during the 25 Hz (MLF) and 50mA beam operation in
FY2019. This situation is almost the same as before. To
reduce the down time of the linac due to regular RFQ
trips, modifications have been done to the LLRF system.
The new LLRF system can re-start the high-power RFwith the next macro-pulse (40 ms) after the RFQ trip.
Presently, a re-start of MPS (machine protection system)by the operator requires approximately 30 seconds. The
auto-restart without activation of the MPS is planned
for the next year.

Fig. 2. Time variation of the number of RFQ RF-trips.

After the Great East Japan Earthquake in 2011, we
could not input the design rf power into some SDTL
cavities due to the multipactor effect. To improve thissituation, since 2015, we have been wiping the insideof the cavities by using acetone during the summer

J-PARC Annual Report 2019

Accelerators

7
shutdown. After the treatment, the multipactor region
disappeared completely, except in the SDTL05A cavity. We suppose that the SDTL05A was not cleaned up
sufficiently, therefore we retried the cavity cleaning of
the SDTL05A in the summer of 2019. Immediately after
treatment, the region was reduced, but spread again
in a few weeks. Although it is assumed that there is noserious problem in the operation, we plan to try wipingwith dilute sulfuric acid in the 2020 summer shutdown.
The operation of the ACS cavities was more stable
than the one of the other cavities. The number of tripsof all the ACS cavities was less than once per day.
RF system status
We have been using two types of klystrons, a 324MHz klystron and a 972-MHz one. Their operation times
as of March 2020, are shown in Fig. 3. Eight out of thetwenty 324-MHz klystrons exceeded 70,000 hours ofoperation, which has been the entire period since thelinac operation was started. Most of the 972-MHz klystrons exceeded 40,000 hours of operation. In FY2019,
one of each type of klystrons was replaced during the2019 summer shutdown. The 324-MHz klystron for the
SDTL09 was replaced due to its performance degradation. The 972-MHz one for the ACS17 was replaced due
to slight water leak from a body cooling pipe.
In RUN#83, malfunction of the klystron power
supply #6 occurred. The malfunction was caused by aFig. 3. The operation time of the 324-MHz klystron (upper)
and the 972-MHz klystron (lower) as of March 2020.

defect in the control board installed at an AVR (automatic voltage regulator) in the klystron power supply
system. The power supply was restored by replacing itwith a spare one.
Procurement of the conditioned klystron is getting
difficult from manufacturer due to busy schedule of theconditioning equipment in manufacturer’s factory. A
test-stand for the klystrons was assembled to perform
off-line conditioning. The test-stand will be fully operational in FY2020.
Beam monitor development
For higher intensity beam measurement, we havedeveloped a beam monitor with high thermal load
tolerance and a non-destructive type beam profile
monitor (e.g. gas sheet beam monitor).
We have developed a new wire scanner monitor(WSM) based on the CNT wire, which has high tensile
strength and electric conductivity, and are sequentiallyreplacing it with the WSM based on the carbon wire
at MEBT1 (medium energy beam transport1 locatedbetween the RFQ and the DTL).
We are working to improve the beam quality of
the linac by tuning the longitudinal beam profile at the
MEBT1 using the bunch shape monitor (BSM). The measurement of the high-intensity and slow (3 MeV) beamof the MEBT1 was difficult with the conventional BSM
using tungsten wire as a secondary-electron production target due to the limitation of the thermal-fatigue
damage. Therefore, a highly oriented pyrolytic graphite (HOPG), which has high thermal load tolerance, wasadopted as the target (Fig. 4). As a result of the performance evaluation test, we succeeded in detecting thesecondary electrons generated by the HOPG target
placed in the center of the beam. Since the HOPG wasfound to be useful as a secondary- electron target for

Fig. 4. B unch shape monitor head equipped with a HOPG
target.

Accelerators

J-PARC Annual Report 20198
the high-intensity and slow beam, the BSM using the
HOPG will be installed in the beamline in the near
future.
Beam study
Beam studies have been conducted to resolve
some issues, such as the beam loss mitigation, confirmation of feasibility for the further upgrade plan, andso on.
An increase of the residual radiation at DTL1 wasobserved at the 50-mA operation. By local envelope
correction and confirming the effect with scintillation monitor measurements, the radiation source wasremoved, and the residual radiation decreased
significantly.
At the ACS section, the main source of beam loss
was found to be IBSt (intra-beam stripping) in the Hbeam. Because the loss rate by IBSt can be affected
only by beam optics, some optics with different temperature ratio between transverse and longitudinalplanes (Tx/Tz) were examined (The optics of Tx/Tz=1.0
is the J-PARC linac baseline design based on the equipartitioning setting). The use of Tx/Tz=0.7 optics in theoperation started in April 2019. As a result, the residual
radiation decreased by 40% compared with Tx/Tz=1.0.
The result was in good agreement with the numericalsimulation projection.

We are considering a further upgrade plan toincrease the RCS beam power to 1.5 MW. To realize that
plan, the beam current and the beam pulse length must
increase to 60 mA and 600 μs respectively. We obtained
successfully a 400-MeV and 60-mA beam at the linac
exit in July 2018. In this year, we tried 60-mA and 600-ms
beam injection to the RCS. Figure 5 shows the first resultof the 60-mA and 600-ms beam extracted from the linac
in July 2019. Although the beam current and the pulse
length satisfied the upgrade requirement, the linac output emittance was large. As a result of fine beam tuning
by changing the MEBT1 bunchers, the emittance was
improved. Further beam study is necessary.

Fig. 5. F irst result of 400-MeV, 60-mA and 600-ms demonstration at the linac.

J-PARC Annual Report 2019

Accelerators

9

RCS
Operational status
The operation status of the RCS was quite stable in
JFY 2019. The availability of the RCS is summarized inTable 1. The operation time for the MLF over the year
was approximately 2775 h, excluding the commissioning time, and the downtime was approximately 27 h.
The availability for the MLF was evaluated by thesevalues and it was 99.0%. For the Neutrino and Hadronusers, the availabilities of RCS were almost same as in
the MLF case and those values were around 99%.
Table 1. Summary of the availability
Facility

User time(h)Trouble in
RCS (h)Availability of
the RCS (%)

MLF

2775:22

27:22

99.0

Neutrino

1053:32

8:28

99.2

Hadron1089:28

3:06

99.7

Figure 1 shows the change in the RCS output
power with respect to time. Throughout the JFY 2019,
RCS delivered more than 500-kW beam to the MLF. Just
before the summer shutdown period, we tried a 1-MW,
10-h continuous operation for the MLF.
500-kW

500-kW

1-MW, 10 hdemonstration

Fig. 1. Changes in the RCS output particles over time.

This year, there were no serious problems in the RCS,
but a dipole magnet in the beam transport line from the
RCS to MR malfunctioned. Due to this trouble, the MR
operation was suspended and only the MLF accepted
the RCS beam until the summer shutdown. Next, there
was a trouble with the neutron target replacement process during the summer shutdown period. Due to thistrouble, the MLF operation was delayed by more thana month.

Maintenance and improvements
1) Foil production
In the J-PARC RCS, The Hybrid type Boron-doped
Carbon (HBC) foil produced in KEK had been used
for charge exchange injection. Now it is produced at
the J-PARC site and we have been using this HBC foil
for the full user operation. Fig. 2 shows photographsof two foils after the user operation. Foils were used
for 1-2 months with more than 500-kW beam power,
and all foils maintained sufficient charge exchange
efficiency under those conditions regardless of different production lots. We have also been searching foranother candidate and tested a commercial carbon film
developed by Kaneka corporation. This Kaneka foil also
showed enough toughness and performed consistently
under the 500-kW user operation condition.

Fig. 2. P hotographs of foils after irradiation. The foil on theleft looked deformed, but its performance was unchanged.

2) RF feedback system
In the RCS, mitigation of the wake voltage in an
accelerating cavity is a key to achieving stable acceleration of the high-intensity beam. The RF feedforward
method had been employed in the original low-level rf(LLRF) control system for such purpose, but it showed
performance degradation at 1-MW beam power.
Therefore, the multi-harmonic vector rf voltage
control feedback implemented in the new LLRF control
system was deployed in 2019. The feedback system wastested using a 1-MW equivalent beam. The test result
showed that the wake voltage due to the high beam
current was well minimized by the new feedback system. However, the beam loss in the RCS increased.
We investigated its reason and a numerical simulation indicated that the wake voltage was increasing thebunching factor. In the former feedforward system, thewake voltage could not be completely compensated.
However, such remaining wake voltage shook the particle motion in the longitudinal phase space and led toflattening of the bunch. Therefore, the complete compensation of the wake voltage by the new feedback

Accelerators

J-PARC Annual Report 201910
system caused a decrease of the bunching factor andan increase of the beam loss. In order to rectify this situation, the duration of the second harmonic rf voltage
application was extended. As a result, the beam loss
was recovered to the same level as that of the feedforward system.
Residual dose distribution and exposure during
maintenance
Table 2 summarizes the radiation doses received
by the workers during the summer shutdown period
in 2019. A total of 60 workers were exposed to dosesof more than 0.01 mSv, and their collective dose was
6.6 man-mSv. The maximum dose received by any one
worker was 0.42 mSv. Both the collective and maximum
doses had increased compared to the previous years.
Table 2. Summary of worker radiation doses during the summer shutdown period in 2019.
Dose (mSv)

Number of workers

0.01–0.05

30

0.06–0.10

12

0.11–0.20

4

0.21–0.30

7

0.31–

7

1-MW demonstration
We demonstrated the 1-MW, 10 h continuous operation in the beginning of July 2019. Figure 3 shows thetrend of some parameters during the 1-MW continuous
operation.
At the first 1-MW continuous operation in 2018,
we observed a vacuum pressure rise of three ordersof magnitude due to a failure of the turbo molecularpump (TMP) at an arc section. In contrast, the maximum
vacuum pressure of this 1-MW continuous operation
was only three times larger than that of the 500-kW user
operation. The lower graph in Fig. 3 shows the trend of
vacuum pressure in the RCS beam line.
The other concern about the 1-MW continuous
operation is the durability of the charge exchange foil.
We have been carefully monitoring the foil deformation during the beam operation by a video camera, andalso measuring the beam current toward the injection
dump to evaluate the charge exchange efficiency. The
middle graph in Fig. 3 shows the trend of the beam current. During the 1-MW operation, this beam current
fluctuated about ± 5%, which corresponded to only
0.025% fluctuation of the circulating beam current. Thisstability was sufficient for the user operation.
The upper graph in Fig. 3 shows the temperature
trend of the injection beam dump. In this situation,
only three interlocks happened during 10-h continuous

Fig. 3. Trend of parameters during the 1-MW continuous operation.

J-PARC Annual Report 2019

Accelerators

11
operation. Therefore, the injection dump was continuously heated up and the temperature seemed almost
saturated at the end of this demonstration.
After the demonstration, we measured the residual
dose values around the accelerator components andfound that they were low enough to accept and thesame as those in the previous year.
Beyond 1-MW: Beam study for 1.5-MW beam power
Last year, we successfully demonstrated 1.2-MW
equivalent beam acceleration in the RCS. Unfortunately,
the present RF system cannot accelerate stably a beamwith power over 1 MW and we carried out the 1.2-MW
beam trial with an acceleration energy of 1 GeV.
This year we tried for a 1.5-MW equivalent beam
acceleration in the RCS. In order to establish this condition, both the peak current and macro pulse length of
the injection beam were increased. For the same reason as in the previous year, we limited the accelerationenergy to 0.8 GeV. In order to minimize the beam loss,
the betatron tune and the transverse painting parameters were changed from those of the 1-MW operation.
After fine tuning in this situation, we obtained sufficient
low-loss beam condition even at 1.5-MW equivalentbeam power. Figure 4 shows the circulating beam
intensity measured by the slow current transformer(SCT) with various levels of beam power. We can see nosignal reduction in any cases and the beam loss monitor signal indicated that the amount of a total beam-3
loss was an order of 10 even if the 1.5-MW beam wasaccelerated.
In this way, we demonstrated the RCS potential todeliver more than 1-MW beam power. Nevertheless,there are some issues to limiting the acceleration of abeam over 1 MW. To begin with, reinforcement of RF
system would be needed. The improvement plans of
the power supply system and the cavity are under consideration. The second issue is the transverse painting
area extension. To reduce the loss near the injection

point, it is better to have a wider painting area. As aresult, we chose the value of 200 p mm-mrad. as a 1-MW
operation parameter. However, we have to reduce thepainting area to 150 p mm-mrad. to minimize the total
loss in the 1.5-MW case. Therefore, the residual dosenear the injection point would be several times higher
than that of the 1-MW operation. We have continued
the study to establish a better parameter to meet both
requirements.

Fig. 4. C irculating beam intensity measured by the SCT forvarious beam intensity.

Summary
The RCS has stably delivered 4.6e13 ppp (530-kW)
beam to the MLF and 6.7e13 ppp (810-kW equivalent in
RCS) beam to the MR in JFY2019.
We achieved a 1-MW, 10-h continuous operation
with sufficient stability of all components.
Beam studies for achieving 1.5-MW power were also
carried out. Results indicated that the RCS has enoughcapability to accelerate a 1.5-MW beam but needs some
improvements for a stable user operation. We are continuing the study to achieve more stable conditions.

Accelerators

J-PARC Annual Report 2019

12

MR
Overview
The 30-GeV Main Ring synchrotron (MR) of J-PARC
supplies the intense 30-GeV proton beam alternatively
to the neutrino experimental facility and the hadronexperimental facility. The repetition rate of the MR
beam operation for the former experiment is 2.48 s and5.2 s for the latter. Thus, the 2.48-s period operation iscalled fast extraction (FX) mode and the 5.2-s operation
is called slow extraction (SX) mode.
The design beam power for the neutrino experimental facility is 750-kW of 30-GeV proton. However, it
should be increased to 1.3-MW because the Japanese
government has approved the construction of a larger
neutrino detector, Hyper-Kamiokande (HK), and HK
needs a more intense beam. The hadron experimentrequires 100-kW proton beam power at 30-GeV withextremely high stability of the magnetic fields of around-5
10 or less.
The MR aims to achieve the desired power andbeam quality by the closed collaboration with the linac
and the RCS of J-PARC. Furthermore, a stable daily beam
operation for the users must be maintained regularly.
A beam availability of approximately 90% is normally demanded as the user facility. The availability
at the neutrino experimental facility was 90.3% in
JFY2019. However, it was 79.8% for the hadron experimental facility due to a trouble.
As mentioned in the previous annual report of
J-PARC (JFY2018), the magnet in the beam transportline from the RCS to MR failed due to an interlayer shortcircuit of the coil on March 18, 2019. After the temporary
repair of the magnet, MR resumed the SX-mode operation for users from April 4 and a 51-kW beam was stably
supplied to the hadron experiment with an efficiency of
99.5%. However, the magnet trouble recurred on April

Fig. 1. MR beam power history (JFY2019)24, 2019 and the operation was suspended. As a result,the hadron experimental period was reduced and thebeam availability for the hadron experimental facility
became lower.
The broken coil was replaced with a new one in
September 2019. Thus, the suspended MR operation
was resumed in November 2019 on schedule for theneutrino experiment. During the neutrino experiment,
the stable operation of the 515-kW beam power wasachieved as shown in Fig. 1.
FX-mode operation
The beam power of MR is limited mainly by thebeam loss in the collimation area, where the beamlosses in the ring are localized. The beam transport linefrom the RCS to MR and the injection area have beamcollimation systems. Each system has been designed tocope with 2 kW of beam losses.
The comparison of the operation loss in JFY2018
and JFY2019 is summarized in Table 1.
Table 1. Comparison of the beam loss.

[*1] Estimated by the current monitor, DCCT in the MR[*2] Measured data of long AIC beam loss monitor (calibrated)

The operation of the 515-kW beam power withan acceptable beam loss was achieved by the tunings
described below:(1) The RCS improved the transverse emittance ofthe beam extracted to MR. It was done by the optimization of the beam tuning not only in the RCS but also in
the linac.
(2) The renovated LLRF feedback systems suppressed the coupled bunch instabilities appearing for
h=8 and h=10 effectively during acceleration as shownin Fig. 2. It has been proved that the feedback system ismore effective than the feed forward one.
(3) Tune tracking during the acceleration reduced
the losses in the collimation system even further.

J-PARC Annual Report 2019

Accelerators

13(a) mountain plot without the RF feedback(b) mountain plot with the RF feedback
Fig. 2. Bunch oscillation of the 480-kW beam

Fig. 3. MR 1.3 MW power upgrade plan

Toward the 1.3-MW operation
As mentioned above, MR is needed to accelerate
the 1.3-MW beam for the HK detector. It requires not
only new power converters for main dipoles and quadrupoles to increase the MR cycle of about 1.16 s, butalso the improvement of the following subjects.
(1) The RF cavities of the fundamental systemshould be increased in number over the years from 7 to9. Furthermore, the RF anode current must be increased
by adding new power units to the existing anode power
supply.
(2) Two second harmonic rf cavities are also
required.
(3) The injection and extraction elements (septa
and kicker) must be changed to increase their repetition rate.
(4) The collimation system in the MR injection
region must be upgraded for a capacity of 3.5 kW beamloss as compared to the present 2 kW.
The revised upgrade plan for the MR beam power
ramp up is shown in Fig. 3.
Summary
The magnet trouble recurred in April of JFY2019
and caused a suspension of the user operation until
the fall of 2019. As a result, the beam availability of thehadron experiment dropped to almost 80%. However,the beam availability for the neutrino experiment,
which was started from December 2019 after the repairof the magnet, reached more than 90%. The beam
power for the FX-mode increased up to the 515 kW. The
Hyper-Kamiokande project was approved by the government, so the planned beam power to be reached
was increased from 750 kW to 1.3 MW. Thus, the power
upgrade plan has also been revised.

Materials and Life Science
Experimental Facility
Overview
In fiscal year 2019, Materials and Life Science
Experimental Facility (MLF) ran the user program for 8
months with the proton beam power of 500 kW, demonstrating the durability of the mercury target with 500
kW. Besides, the validity of the system design at the
final power target was reconfirmed by a 10-hour 1-MW
test on July 3. During the summer outage period, target vessel #9 was replaced with a target vessel #11 witha new design which has the coupling-free structure
between the inner mercury and the surrounding outerwater. The restart of the beam operation was delayed
for about a month since the gas processing needed longer time than expected to reduce the radioactive gas
before releasing it from the stack.
The muon rotating target system, which could suffer potential damage from a flexible joint for transferring
motor rotation to the graphite disk target, served formuon production for 7 months and was replaced with abrand-new spare in the summer outage.
Due to the stable operation of the facility, theMLF was able to produce many excellent outcomes invarious research fields. The construction of beam linesand development of detectors and devices advanced.
However, at the end of JFY2019, the COVID-19 pandemic affected the user program mainly because theusers could not travel to J-PARC. Some of those experiments were done by instrument groups and the others
were carried over.
The annual meeting of industrial application at
J-PARC MLF was held on July 18 and 19 at Akihabara
Convention Hall. The 4th Neutron and Muon School
was held from October 28 to November 2, together
with the MIRAI PhD School 2019 (youngMIRAI-2019).
Quantum Beam Science Festa which is an annual conference mainly for domestic users for MLF J-PARC andIMSS KEK was planned to be held in Mito on March 12

Materials and Life Science Experimental Facility

J-PARC Annual Report 201916
and 13, 2020, but was canceled due to COVID-19.
In the annual report, the research highlights andthe technical developments in 2019 are described indetail.

Neutron Source Section
The neutron source continued its stable operationin fiscal year 2019. The beam operation of mercury
target #9, which had the same design as the preceding target #8, started in late October 2018 and ended
in early July 2019 with a beam power of 500 kW during almost the entire operation time. It was the firstachievement to continue the user program with thathigh power throughout 8 months operation, which
demonstrated the durability of the mercury target to
be used for 500-kW power. After the user program wasclosed, a high-power operation study was held for 10.5
hours at 930 kW on July 3. Much operation data which
need long time to reach stable value could be obtained
and the validity of the system design at the power offinal goal was reconfirmed.
The most important challenge to achieve 1-MW stable operation is to mitigate the pitting damages on the
inner wall of the target vessel that are caused by pressure waves in mercury. This is achieved by using target
vessels designed to inject micro-bubbles of helium gas
into mercury for reducing the intensity of the pressure
waves. The efficiency of the micro-bubble injection ismonitored by measuring sound signals with a microphone. Figure 1 shows the dependency of the soundsignal magnitude on the beam power. The sound signal
was normalized with that in the case of 340 kW without
micro-bubble injection. The broad scatterings of target#9 data from 300 kW to 600 kW are due to the change
in the amount of the micro-bubble injection and proton beam profiles. All in all, the sound data of targets#8 and #9 showed a consistent trend, which confirmed

Normalized peak valueof sound signal

1.5
1MW Study

1

Target #9
Target #8

0.5
0

0

200 400 600 800 1000
Beam power [kW]Fig. 1. Sound signal data of the target vessels at beam study.

the efficiency of the micro-bubble injection to reducepressure waves.
Specimens were cut out from the forefront wallof target vessel #9 to see the inside pitting damages.
As shown in Fig. 2, both the high-speed mercury flow
in a narrow channel and the micro-bubbles injection
into mercury are used to mitigate the pitting damages.
The picture in Fig. 2 shows that the pitting damages
on the outer wall that is the boundary of mercury containment were negligibly small, even after the long runof the 500-kW operation. But on the other hand, themaximum damage depth on the inner wall, which wasprotected by micro-bubbles, was 3.3 mm. R&D for atechnology to intensify the bubbling effect to mitigate
pitting damages will be continued.

Outer wall
Protonbeam

Inner wallMicrobubblesNarrowchannelMercury
ﬂow

Fig. 2. Structure of the target fore-front part and the innersurface of an outer wall specimen

Target vessel #9 was replaced to a target vessel
with a new design, in which the coupling-free structure between the inner mercury and the surrounding
outer water shroud removes the structural cause ofgenerating high thermal stress on the target. The stable
operation of this new type of target vessel demonstrated the successful design improvement after thetarget vessel failure in 2015 and was one of the major
milestones to achieve 1 MW power.
After the summer outage period, the restart of thebeam operation was delayed for about a month since
the gas processing system, which plays an importantrole in the target replacement procedure, needed longer time than expected for careful operation to secure
the enough radiation-safety. These operation experiences will be reflected on more robust and reliable
system improvements.

J-PARC Annual Report 2019

Materials and Life Science Experimental Facility

17

Neutron Science Section
1. New perspective in Neutron Science Section
Materials and Life Science Experimental Facility(MLF), one of world-leading user facilities, expands
gradually its activities. Stable 500-kW beam power isbeing continuously supplied for the user program.
And the beam test with the full power of 1 MW was
performed successfully. The applied proposals haveincreased to a record number in 2019B. In JFY2019, thetotal usage by visitors reached 16,204 person-days.
To continue the constant expansion of the activities in the Neutron Science Section and the MLF, wemaintain contacts not only with domestic, but also withforeign scientific facilities, such as ANSTO (Australia)
and CSNS (China), in the areas of personnel, techniques,
and research exchange. Also, we made efforts to communicate with the neutron scattering society throughthe annual meeting about industrial applications at
the MLF (282 participants), the J-PARC symposiumth(909 participants), the 4 Neutron-Muon School (MIRAIPhD School) (41 participants), and the CROSSroads
Workshop (70 participants).
2. Instrumentation kept up to dateCurrently, 21 neutron instruments are operated.
POLANO is the youngest instrument, which just opened
for the user program. POLANO combines inelastic neutron spectroscopy with polarization analysis, and is oneof the most complicated but demanded instruments,
particularly for researches of systems where multiple

physical degrees of freedoms are struggling or cooperating. Since the polarization devices on POLANO are
still under commissioning, the proposals with unpolarized neutrons are currently available.
A brand new T0 chopper developed by theTechnology Development Section debuted in the
4SEASONS spectrometer (Fig.1). A T0 chopper is a
device that can eliminate unwilling gamma flash andvery fast neutrons from the target source. After several
years of design and development, the first prototype
was installed and used for real beam experiments.
3. User program
In fiscal year 2019, the MLF received 326 proposals for 2019A and 444 for 2019B, of which 222 and 224
were approved, respectively. Also, 4 long-term proposals (LTP) were adjusted from 9 submissions and 17
LTPs are being executed in 2019B. Due to a one-monthinterruption of the beam delivery after the summer
maintenance, all experiments scheduled for this term
were carried over to 2020A. At the end of JFY2019, the
COVID-19 pandemic affected the user program mainly
because the users could not travel to J-PARC. Someof those experiments were conducted by instrumentgroups and the rest were carried over.
4. Scientific outcome
The research activities in neutron science at the MLF
resulted in more than 150 papers and 12 press releases.
Inelastic and quasielastic neutron scattering measurements using AMATERAS revealed pressure-induced
large entropy changes associated with the molecularorder-disorder phase transition in plastic crystals (BingLi et al., Nature 567 (2019) 506.). These findings can beapplied to novel refrigeration technology.

Fig. 1. Brand new T0 chopper installed into the beamline of
4SEASONS.

Y. Kawakita1, T. Yokoo1,2, M. Nakamura1, S. Itoh1,2, K. Nakajima1 and T. Otomo1,2

Neutron Science Section, Materials and Life Science Division, J-PARC Center; 2Institute of Materials Structure Science, High Energy Accelerator Research Organization, KEK

1

Materials and Life Science Experimental Facility

J-PARC Annual Report 201918

Neutron Device
As one of the activities at the Neutron Instrumentation
Section of the MLF Division, research and developmentof a scintillation neutron detector has been in progress
for the neutron diffraction imaging experiments at the
MLF. A two-dimensional neutron detector with a spatial
resolution of about 200 mm and with a neutron-sensitive area of more than 20 × 20 mm is required for theexperiment.
We introduce here our solution to provide suchdetectors with scintillator / wavelength shifting (WLS)
fiber detector technology. To meet the requirements,
the neutron-detecting head was made by using WLS
fibers with a diameter of 100 mm [1]. Figure 1 shows aphotograph of the prototype detector. The WLS fibers
were aligned in a flat without air gap between them. Twoof these fiber arrays were produced and each contained
224 fibers. They were arranged diagonally in contact
with each other, creating fiber channels for the x andy directions. On top of the crossed fiber arrays, a single
6
Li:ZnS scintillator screen was implemented. The scintillator screen was grinded down to 0.17 mm to lower
the light spread within the scintillator. It ensured a highspatial resolution of the detector. The spatial resolution,neutron detection efficiency, and gamma-ray sensitivity
were estimated to be about 200 mm, 7% at 1.8Å-neutrons,-6
and 10 at gamma-ray energy of 1.17 MeV and 1.33 MeV
60
of a Co source, respectively, in other experiments. The
detector specifications are summarized in Table 1.
Figure 2 shows one of the time-of-flight neutron
diffraction images measured at BL10 of the J-PARC MLF.
Details of the experiments can be found in Ref. [2]. The
coarse-grained electromagnetic steel plate was set as asample at the distance of 13.4 m from the pulsed neutron
source. The detector was located close to the sample ata distance of 7 cm from it at 90 degrees. Many diffraction
spots were traced clearly in the measured images, confirming the feasibility of the detector.
In summary, a high-resolution neutron detector
was developed by using scintillator / WLS fiber detector
technology. The developed detector was implemented
successfully into the demonstration experiment for timeof-flight neutron diffraction imaging in the J-PARC MLF.
In the future, the detection efficiency will be improved6by adjusting the Li content in the scintillator and/or byequipping multiple scintillator / WLS detecting heads.

(a)(b) WLS ﬁbers
Scintillator
24 x 24 mm

Fig. 1. (a) Photograph of the 200-mm spatial resolution scintillation detector. (b) Inside view of the neutron detecting head.
Table 1. Detector specifications
Neutron sensitive area

: 24 x 24 mm

Pixel size

: 107 x 107 μm

Number of pixels: 50176

Spatial resolution: 200 μm

Neutron detection efficiency: ~ 7% @1.8Å

Gamma-ray sensitivity: ~10-6 @ 60Co

Physical size

: 40w x 45d x 30h cm

Weight: 25 kg

5 mm
Fig. 2. An example of neutron diffraction images measured
with the detector [2].

References[1] T. Nakamura, et al., 2018 IEEE NSS/MIC Conference Records,
pp. 1-3, doi: 10.1109/NSSMIC.2018.8824447.
[2] T. Kawasaki, et al., Physica B: Condensed Matter 551 (2018)
460.

J-PARC Annual Report 2019

Materials and Life Science Experimental Facility

19

Muon Section
Construction of electric power substation for the
H-line completed
Among the muon beamlines envisioned in theoriginal plan of the MLF, the H-line in experimental hall
No. 1 has been delayed for years due to lack of funding from MEXT. Considering the situation, the J-PARC
headquarters decided to provide partial support forrealization of the plan. The support was primarily forthe construction of a new electric power substation tocover the huge demand for electricity expected when
the H-line becomes fully operational. Following the
installation of cable racks, pitting of the MLF building
wall, and outdoor structures in FY2017, the major civilengineering work for the substation site near the MLF
building was completed by the end of March 2019 (seeFig. 1). Meanwhile, the work continued to ensure accessto electricity at the substation site. During the last summer shutdown, a power panel was installed in hall No.1
at the MLF. The scaffoldings around the main carry-in
door (where power cables pass through) was removed
after the completion of cabling work from the new
power substation to the interior of the MLF. Those whoplan experiments on the H-line are now hoping to haveelectricity available sometime in FY2020.

Fig. 1. Electric power substation constructed on the east side of
the MLF building (left). The white wall in the back is thatof the NU2 building. (Photo taken in May 2019)

Muon rotating target replaced
As reported a year ago, potential damage of a flexible joint within the muon rotating target system wassuspected during the summer maintenance in FY2018.
After careful assessment of the risk expected in case of
joint breakdown, a multitude of safety measures were
imposed to allow for restricted operation of the target
until the next summer shutdown. Fortunately, the target served for muon production without trouble forabout seven months, and was finally replaced with abrand-new spare during the last summer shutdown.
Actually, this was an unprecedented occasion for themuon target team to replace the whole system after
high-proton power operation, and utmost care wastaken to minimize the risk of radiation hazard during
the replacement work (Fig. 2). Now, the new target
seems ready to be exposed to a 1-MW proton beam in
the years to come.

Fig. 2. A snapshot of the MUSE target team working on the target replacement assembly, where the radiation workers
wearing airtight suites are in a temporary greenhouse tocontain radioactive contaminants.

New forum for non-destructive element analysis
with negative muons
A negative muon beam with variable incident
beam energy available at the D2 area is a powerful toolfor depth-resolved non-destructive element analysis
by muonic X-ray emitted on negative muon capture,
which is applicable to variety of objects, from industrial
goods, meteorites, to archeological relics. In FY2019,some extra funding was granted from MEXT for promoting this promising technique by creating a newinterdisciplinary community that unifies historians andquantum beam scientists. To exchange ideas, two workshops were held in Tokyo and Osaka with some 170
attendants, including the general public (Fig. 3). Results

Fig. 3. Group photo at the workshop on application of quantum beams in archelogy and history at the National Museum of Nature and Science, Tokyo.

Materials and Life Science Experimental Facility

J-PARC Annual Report 201920
of several element analysis measurements, including
old Japanese coins from the end of the Muromachi
period and contents of medicine bottles from the endof Edo period, were presented.
Updates from S & U-lines
The Okayama University group received a JSPS
Kakenhi grant for their research project “Precision test ofelectroweak theory and search for new physics beyond
the Standard Model by laser spectroscopy of purely leptonic atoms”. This led to the application of a new S1-typeresearch proposal to use a high-flux surface muon
beam provided by MUSE, which was approved at the
recent PAC meeting. As a result of discussion with the
MUSE staff on how to complete this project within thelimited term of the grant, it was agreed that Okayama
University group was going to assume full support
for the construction of a new experimental area S2 in
FY2020, so that they can secure a major portion of the
beamtime without affecting other user programs.
At the U-Line, continued efforts for increasing ultraslow muon intensity were in progress. For a muonium
ionization laser system, a new crystal (YSAG) for amplification of 212 nm light was successfully fabricatedand its implementation in the existing system started.
At U1B, a dedicated interference experimental setup
was prepared as a part of the S1-type research project“Transmission Muon Microscopy” to verify the waveparticle duality of the muon.

Technology Development Section
Development of 3He spin filters
3
We have been developing He neutron spin fil3
ters ( He-NSFs), which can polarize neutrons in a wide
energy range and cover a large solid angle, in order toapply them to the neutron beamlines of J-PARC MLF.
3
A gas-filling station to fabricate the He-NSF cells has
been constructed in 2018. The high-quality cells com3
posed of He-gas, potassium, and rubidium with a long3
relaxation time of the He polarization were fabricated3
in 2019 (Fig.1). Also, a new He pumping system using
a 110 W fiber laser setup has been constructed at the
J-PARC research building in 2019. The build-up time of3
the He polarization with the new pumping system isabout 20 hrs., which is 3 times shorter than in the systems made before the gas filling station and the new
pumping system were ready.

3

The He-NSF polarized by the new pumping system
was installed on neutron beamline BL10 of the MLF. The
neutron transmission experiment proved that a very
3high He polarization of 85% could be achieved. The
3
relaxation time of He polarization was ~170 h at thebeamline. The neutron polarization and transmission
3
passing through the He-NSF is shown in Fig.2. We cansee that high neutron polarization is obtained for neutrons in the wide energy range.

Fig. 2. The neutron wavelength dependence of the neutron
polarization and transmission obtained by using the3
He-NSF at BL10.

33Fig. 1. The He spin filter cell fabricated at J-PARC.

Application of He spin filters at the MLF
3
The He-NSF was first applied to a user experimentat the MLF in 2017. In 2018, no user experiment using
3
the He-NSF was planned. In 2019, four user experiments and a demonstration study were performed at

J-PARC Annual Report 2019

Materials and Life Science Experimental Facility

21
BL04, BL10, and BL06, respectively. The 3He-NSFs wereused as neutron polarizers for the experiments to study
nuclear reactions at BL04 and to measure the neutron3
holography at BL10. Furthermore, our He spin filter wasapplied to the MITZE experiment as a spin analyzer tostudy the dynamics of a ferrofluid at BL06 (Fig.3). In this3
experiment, a high He polarization of 75% and longrelaxation time of 130 h were achieved at the beamline.
3
Experiments with the He-NSFs at BL15 and BL21
are also planned to experimentally determine the incoherent scattering intensity from hydrogen atoms andthe magnetic scattering one from a magnetic sample. A
Helmholtz coil equipped with a sample changer to keep
3
He polarization at the neutron beam lines has been
prepared for BL15. Also, a coil, which can be installed
to the vacuum chamber of BL21, is under development.
The experiments are planned for JFY 2020.

3

Fig. 3. The experimental setup at BL06. The He-NSF, which
was installed after the sample to analyze the scatteredneutrons.

Particle and Nuclear Physics

Neutrino Experiment
The T2K run in JFY 2019 began in neutrino modeon November 5 after a shutdown lasting longer thana year and ended on February 12, 2020. The historyof the accumulated protons on the target (POT) andbeam power is plotted in Fig. 1. Stable operation witha beam power of 515 kW was successfully achieved. As
of February 12, since the beginning of the experiment,
20
T2K accumulated 19.9 × 10 POT in neutrino mode in20
addition to the accumulation of 16.5 × 10 POT in antineutrino mode.
On October 9, T2K submitted new analysis results
regarding CP violation. The details of this study aredescribed in the Research Highlight of this report.
T2K published six papers in JFY 2019, including
papers on neutrino-nucleus interaction cross-section

measurements. Knowledge regarding such interactions
is essential for reducing the systematic uncertainty ofneutrino oscillation analysis.

Fig. 1. History of accumulated POT and beam power since
the beginning of T2K.

Particle and Nuclear Physics

J-PARC Annual Report 201924
To improve the performance of the on-site neutrino detector ND280 and achieve beam power beyond
1 MW, extensive work has been conducted. These
activities were further boosted by the approval fromthe government for the Hyper-Kamiokande projectin January. For high-power operation, a new proton
beam profile monitor is required and a detector using
beam-induced gas fluorescence is under development.
A prototype monitor was installed in the proton beamtransport line and the signal of the beam was clearlyobserved, as shown in Fig. 2.
The E71 Ninja experiment, which aimed to precisely
study neutrino-nucleus interactions using a hybrid
emulsion detector at the near-detector hall, yielded its
first data. The development of emulsion films has been
completed and combined analysis using downstream
detectors is underway.

Fig. 2. Fluorescence light image generated by the proton
beam passing through nitrogen gas injected into thebeamline. The vertical axis is the beam direction, while
the horizontal axis is the horizontal beam position

Hadron Experimental Facility
The Hadron Experimental Facility (HEF) of J-PARC
was developed for fixed-target particle and nuclear
physics experiments with secondary hadron beams
produced by a slowly extracted (SX) 30-GeV proton
beam from the Main Ring (MR) accelerator. In JFY 2019,
the SX beam operation began in April with a beam
power of 51 kW and a repetition cycle of 5.20 s. The
operation was stopped abruptly after only 356 hours by
a water leak in a magnet in the transport line from the
RCS to the MR, marking the start of an unforeseen long
shutdown.
To utilize this shutdown, the beamlines were
upgraded earlier than planned with the goal of resuming beam operation in the spring of 2020. A new
production target for secondary particles was installedin November 2019 (Figs. 3 and 4). This target has a cooling structure similar to that of the previous target, but
the cooling efficiency is improved by doubling thenumber of copper cooling blocks. This should make itpossible to receive a primary proton beam power ashigh as 95 kW on the target with a 5.2 s repetition cycle.
The construction of a new primary beamline(B-line) was completed in January of 2020 (Fig. 5). This
beamline transports a small fraction of the primary protons to the hall, where 30 GeV protons can be used inexperiments. In the near future, this beamline will alsodeliver 8 GeV beams for the COMET experiment.

Fig. 3. A He-filled chamber containing the new production
target, which is being lifted for installation.

Fig. 4. A new production target in the chamber with two setsof gold targets cooled by rectangular copper blocks
from the top and bottom.

J-PARC Annual Report 2019

Particle and Nuclear Physics

25

Fig. 5. The newly constructed B-line and a spectrometer (left end) for the new E16 experiment.

Strangeness/Hadron Physics Experiments
With a short beam time in April, the E40 experiment at the K1.8 beamline, which is the key experiment
to understanding the origin of the repulsive core of
the nuclear force, collected approximately half of the+planned Σ p scattering data. Pilot data on kaonichydrogen atom X-ray were also collected by the E57
experiment at the K1.8BR beamline in order to test thefeasibility of the measurement for the kaonic deuterium atom.
A new experiment (E16) was designed to measure

the mass spectra of di-electron pairs around the mass
region of the φ vector meson in proton-nucleus interactions. A novel spectrometer system for thecorresponding “Run-0” was constructed at the B-line
and made ready for commissioning.
A review paper that describes the results of thestrangeness/hadron physics experiments, as well as
the physics goals of the ongoing and approved experiments, has been published.

Kaon Decay Experiment
The KOTO experiment was designed to study the
decay of a long-lived neutral kaon into a neutral π0meson (π ) and a pair of neutrinos. This decay breaks
the CP symmetry directly and the branching ratio can−11
be accurately predicted by the SM as (3.0 ± 0.3) × 10 .
The detection of this decay is so challenging because0only two photons from π are observable and nobody
has succeeded in the observation. By examining thistype of ultra-rare decay, a new source of CP symmetry breaking that can explain the matter–antimatterasymmetry in the universe may be revealed.
In JFY 2019, the KOTO experiment continued toaccumulate more physics data and confirmed theupgrades to the calorimeter readout. Analysis of thedata collected from JFY 2016 to JFY 2018 was reported
at the International Conference on Kaon Physics 2019
(Perugia, Italy, September 2019). Four candidate eventswere observed in the signal region and their properties
and origins are currently under investigation.

Muon Experiments
COMET, which is a J-PARC E21 experiment, aims toidentify muon-to-electron conversion with a sensitivity−14
better than 10 . Intensive research and development
were conducted in 2019. A cylindrical drift chamber was
successfully tested using cosmic-ray muons with a full

setup of readout electronics, including a parallel readout
scheme. The construction of a straw tube tracker and themass production of lutetium yttrium orthosilicate for theelectron calorimeter are ongoing.
The construction of a capture solenoid (CS), which

Particle and Nuclear Physics

J-PARC Annual Report 201926
will be used to collect and transport pions/muons produced by the COMET primary proton target, as well as
the preparation of a cryogenic system, is progressing
according to schedule. The superconducting wire winding of all necessary coils for the CS was completed in
2019. The assembly and installation of these coils into acryostat will occur in 2020. The COMET collaboration has
published a detailed design for this experiment.
The E34 collaboration is preparing for precision
measurements of the anomalous magnetic moment

and EDM of muons. This collaboration has publishedthe technical design of their experiment. A task force
for the H-line building extension was formed and hasplanned to proceed with construction. Experimental
technology and components have also been developed.
Important achievements in the development of a silicon
strip detector module, a buncher cavity, diagnostic tools
for muon accelerators, and an NMR probes for absolute
magnetic field measurements have been published invarious journals.

Highlight: T2K data place the strongest constraint on
the leptonic CP violating phase in neutrino oscillation
The matter-antimatter imbalance of the observable universe is one of the biggest mysteries in physics.
Violation of the charge-conjugation and parity-reversal(CP) symmetry is required to explain the imbalance.
Although the CP violation has been observed in thequark sector, it is too small to ex- plain the observed
imbalance in the universe [1]. However, the CP violation in the neutrino sector may be up to three ordersof magnitude larger and could therefore help solve themystery.
The neutrino is an elementary particle that interacts only via the weak and gravitational forces. There
are three types of neutrinos - electron, muon, and tau
neutrinos; they are named for their charged partners.
Neutrinos have an interesting property: as they travel,
they can change from one type to another in a phenomenon known as neutrino oscillation. The oscillation
probability is expressed by the three mixing angles
22(θ12, θ23, θ13), two mass differences (∆m 21, ∆m 32), andthe CP phase (δCP ) in the standard parameterization.
The Tokai-to-Kamioka (T2K) experiment [2] is along baseline neutrino experiment built to reveal thenature of neutrino oscillations. Figure 1 shows theexperimental setup for T2K. A high-intensity beam of
30 GeV protons is produced in J-PARC, Tokai.
The beam is exposed to a graphite target to produce
charged pions and kaons, which decay in flight mostly
to muon neutrinos after focusing by three magnetic
horns. The beam can be switched between neutrino
and antineutrino modes by changing the polarity of
the horn current. The unoscillated neutrino flux is measured by the near detectors placed at 280 m from thetarget. Neutrino oscillation eﬀects are measured at thefar detector, Super-Kamiokande, with a 295 km baseline. The T2K experiment began data-taking in January
2010, and discovered electron neutrino appearance inmuon neutrino beam in 2013 [3], which enabled us tomeasure the δCP in the neutrino oscillation. The parameter δCP can take any values between -180˚ and 180˚.
If it equals 0˚ or 180˚, the neutrinos and antineutrinoschange their types in the same way during oscillation ina vacuum. Otherwise, the δCP parameter has a value thatenhances or suppresses the oscillations of neutrinos orantineutrinos, breaking the CP symmetry. Currently, theT2K experiment is aiming to measure the unknown δCP .
Measurements of the neutrino CP phase provide new

Fig. 1. Experimental setup of T2K

J-PARC Annual Report 2019

Particle and Nuclear Physics

27
knowledge on the nature of neutrinos as well as a hintof matter-antimatter imbalance of the universe.
The T2K collaboration released new results [4], ana21
21
lyzing data with 1.49 × 10 and 1.64 × 10 pro- tons
from the accelerator for neutrino and antineutrino
modes, respectively. The observed number of electron(anti)neutrino events as a function of reconstructed
neutrino energy is shown in Fig. 2. T2K observed 90
electron neutrino candidates and 15 electron antineutrino candidates. T2K is expected to observe 82 electron
neutrino events compared to 17 electron antineutrino
events for maximal neutrino enhancement at δCP =-90˚, and 56 electron neutrino events compared to 22
electron antineutrino events for maximal antineutrino
enhancement at δCP = 90˚.
The T2K data are most compatible with a value close
to δCP = -90˚ which significantly enhances the oscillation
probability of neutrinos in the T2K experiment. Using
this data, T2K evaluates confidence intervals for theδCP. The disfavored region at the 99.7% (3σ) confidence
level is -2˚ to 165˚ as illustrated in Fig. 3. This result represents the strongest constraint on δCP to date and an
important step toward knowing whether or not neutrinos and antineutrinos behave diﬀerently. The values of
0˚ and 180˚ are disfavored at the 95% confidence level,
which is consistent with previous results in 2018 [5],indicating that CP symmetry may be violated in neutrino oscillations. This result has been published in thejournal, Nature in April 2020 [6]. While this result showsa strong preference for enhancement of the neutrino
rate in T2K, it is not yet clear whether the CP symmetryis violated or not. To further improve the experimental
sensitivity, we will upgrade the near detector to reduce
systematic errors, and J-PARC will increase the beam
intensity by upgrading the accelerator and beamline.
T2K will then continue to take high-quality data withthe upgraded detector and beamline.
Reference[1] M. Tanabashi et al. (Particle Data Group), Phys. Rev. D 98,
030001 (2018).
[2] K. Abe et al. (T2K Collaboration), Nucl. In- strum. Meth. A 659,
106 (2011).
[3] K. Abe et al. (T2K Collaboration), Phys. Rev. Lett. 112, 061802(2013).
[4] K. Abe et al. (T2K Collaboration), arXiv:1910.03887 (2019).
[5] K. Abe et al. (T2K Collaboration), Phys. Rev.Lett. 121, 171802(2018).
[6] K. Abe et al. (T2K Collaboration), Nature 580, 339 (2020).

Fig. 2. Observed electron (anti) neutrino candidate eventswith predictions for diﬀerent δCP values. T2K data ismost compatible with a value close to δCP = -90˚ (red,long dashed).

Fig. 3. Constraint on the neutrino CP phase. About half of thepossible values are disfavored at the 99.7% (3σ) confidence level.

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
maintainance and operation of the superconducting
magnet systems for the T2K neutrino beamline andthe muon beamlines at the Materials and Life Science
Experimental Facility (MLF) and construction of 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 201930

Cryogen Supply and Technical Support
The Cryogenics Section provides liquid helium
cryogen for physics experiments at J-PARC. The usedhelium is recycled by the helium gas recovery facility at
the Cryogenics Section. Figure 1 summarizes the liquid
helium supply in FY2019.
Liquid nitrogen was also supplied to the users fortheir convenience. Its amount in FY2019 is summarized
in Fig. 2. Liquid nitrogen has been regularly provided
to the Radiation Safety Section for operation of a gas
chromatograph. It was also supplied to the users in the
MLF and the HEF.

Fig. 1. Liquid helium supply at J-PARC from April 2019 toMarch 2020.

Fig. 2. Liquid nitrogen supply at J-PARC from April 2019 toMarch 2020.

Superconducting Magnet System for T2K
The superconducting magnet system for the T2K
experiment operated during the periods shown in
Table 1. The system worked well without disturbing thebeam time. The operation time was only 3 months in
the winter and regular maintenance works were carriedout in the summer. Figure 3 summarizes the incidents
in the refrigeration system from FY2009 on. The system

was suspended only in its early period due to problems
in the hardware and control parameters. Althougha few problems with hardware parts occurred in the
recent years, the troubles had been resolved without
interrupting the operation. The system was very stable
in FY2019 as well.

1410Parts Trouble

8

Quench Miss Trigger

6

Control Parameter Mistuning
Magnet Quench by Beam

4

Electric Power Outage

2

Refrigerator Suspention
19
20

18

FY

20

17

FY

20

16

FY

20

15

FY

20

14

FY

20

13

FY

20

12

FY

20

11

FY

20

10

FY

20
FY

20

09

0
FY

Number of Incidents

12Fig. 3. Summary of incidents in the Refrigerator System for T2K.

J-PARC Annual Report 2019

Cryogenics Section

31
Table 1. Operation history of the T2K superconducting magnet system.

2019
Apr.

May

June

Jul.

Aug.

Operation

Sep.

Oct.

Nov.

Dec.

10/18-12/21

2020
Jan.

Feb.

Mar.

1/13-2/12

MaintenanceSuperconducting Magnet Systems at the MLF
The Cryogenic Section contributes to the operationand maintenance of the superconducting magnet systems at the Muon Science Facility (MUSE) in the MLF.
The superconducting solenoid in the Decay Muon Line(D-line) was operated from January to the end of June
2019. Annual maintenance, such as exchange of the oil
separation filter, safety valve maintenance and so on,
was performed from July to October. The cryogenic
operation was restarted on December 2. This was significantly behind the schedule since the exchange workof the mercury target took longer than expected. It was
stopped on December 19 for the New Year holidays.
After the update of the computers for the cryogenic
control system, it resumed on January 10. There wasno serious problem in the cryogenic system for D-line
magnets in FY2019.
A reused superconducting solenoid (Fig. 4), which
had originally been developed for a cosmic ray observation, was operated in BL05 for measurement of neutron
life time. The Cryogenic Section prepared equipment
for cooling with liquid helium and for supplying excitation current. The first beam operation was carried out

for two weeks and the solenoid magnet system worked
well. Improved equipment must be developed for the
future long-term operation.

Fig. 4. Superconducting solenoid magnet developed for cosmic ray observation, reused at MLF BL5.

Superconducting Magnet Systems at the HEF
The COMET experiment is under construction in the
Hadron South Experimental Hall (HDS) of the Hadron
Experimental Facility (HEF). The Cryogenics Section
was involved in the construction of the cryogenic system and superconducting magnets. Production of
the superconducting solenoid magnet for the muonsource is in progress. Superconducting coils of the Pion
Capture Solenoid (PCS) have been manufactured using
radiation-resistant material and the detailed design toassemble the cryostat was improved.
The magnets are designed to be cooled by a

two-phase flow of liquid helium which is supplied bya helium refrigeration system built in HDS. The cooling
capacity of the helium refrigerator has been measured
to be 140 W at 4.5 K in the case of 500 W heat load onshield gas. Currently, transfer lines connecting the magnets to the refrigerator and the power supply are underconstruction.
The transfer line from the current lead system tothe Muon Transport Solenoid (MTS) was installed in the
HDS in FY2018. The cooling pipe in the transfer line ismade of stainless steel. The transfer line was connectedCryogenics Section

J-PARC Annual Report 201932
to the small cryostat for protection diodes, which isseparated from the cryostat of MTS magnet. Since thecooling port of MTS has an aluminum cooling pipe, analuminum pipe should be connected from the diodeto the magnet. Connecting the aluminum pipe, which
ensures leak-free conditions in cryogenic temperature
with thermal shocks and thermal cycles, requires a great
deal of skill. Therefore, an automatic welding machine isunder development (Fig. 5) to perform welding withhigh reliability and high yield, while optimizing welding conditions for manual welding. Construction of thecontrol system and tuning the control parameters will
be performed.

Fig. 5. Automatic welding machine developed for welding
cooling pipes.

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 a high field homogeneity, better than 1 ppm
locally, plays a very important role as a muon storage
ring. The temperature effect of iron yoke on the error
field was evaluated in detail. Thermal expansion andmagnetization change due to temperature change of
1 K causes an error field of about 1 ppm, which is larger
than the expectation obtained with primitive calculation of less than 0.1 ppm. The simulation study showsthat the error field could be reduced to 0.2 ppm/K byapplying a bypass circuit. It means that the temperatureneeds to be controlled within 0.5 K, which is an acceptable value.
A muonium hyperfine structure measurement,
called MuSEUM experiment, has been proposed for thesame beam line as the g-2/EDM project. In the experiment, the energy state transition in muonium will beobserved under a static magnetic field with local homogeneity of 1 ppm. A standard NMR probe to determine
the absolute magnetic field is being developed tocalibrate other probes. Cross-calibration tests in the collaborative framework between the USA and Japan havebeen in progress since 2017. The analyses of the tests
at 1.45 T and 1.7 T, which were conducted in January
and February 2019, are still in progress. The new probe
for 3.0 T was tested at the ANL in February 2020 (Fig. 6)
to verify the performance, but the cross calibration test
was postponed due to the COVID-19 situation.

Fig. 6. Newly developed probe for 3.0 T tested at the ANL.

Information System

Overview
The Information System Section plans, designs,
manages and operates the network infrastructure of
J-PARC and also provides support to ensure its information security. In terms of computing, until now, J-PARC
has owed its major computer resource for analyzing

and storing data from neutrinos, nuclear physics and
MLF experiments to the KEK central computer system.
The section connects the J-PARC network to the KEK
central computing system directory and helps the users
to utilize the system effectively.

Status of Networking
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 2019, the total number of hosts

on JLAN exceeded 5,000 and the number has decreased
to 99.8% from the last year. The growth curve of edge
switches, wireless LAN access points and hosts (servers
and PCs) connected to JLAN are shown in Fig. 1.

Information System

J-PARC Annual Report 2019

34

350
300
250
200
150
100
50
0

and 5 show the statistics of data transfer between the
Tokai site and the Tsukuba site. The network bandwidth
capacity between the two sites is 10 Gbps. This showsthat the usage level has been approaching a half of it,
especially during the period when the Hadron facility
was running. In addition to the current bandwidth, theupgrade offers a future option of 20 Gbps for both ofinternet and Tokai-Tsukuba connections, if J-PARC network can be adapted.

Edge Switches
WLAN Access Points
No. of hosts

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

Fig. 2. Network traffic from JLAN to the internet.
(1 hour average and 5 minutes peak value)

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

6000
5000
4000
3000
2000
1000
0

No. of Hosts connected
to JLANSW and WLAN AP

In April 2016, the National Institute of Informatics(NII) upgraded SINET (Japan Science Information
Network https://www.sinet.ad.jp) from version 4 to 5.
SINET is not only a gateway from JLAN to the internet
but also an important connection between Tokai and
KEK Tsukuba site in J-PARC.
Figures 2 and 3 show the network utilization of theinternet from/to JLAN. Since the bandwidth capacity forthe internet through the SINET is 10 Gbps, it is clear that
there is enough space for additional activity. Figures 4

J-PARC Annual Report 2019

Information System

35

Fig. 4. Network traffic from the Tsukuba site to the Tokai site.

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

Fig. 6. Peak network traffic for the recent years.

Internet Connection Services for Visitors andPublic Users of J-PARC
Since 2009, J-PARC has offered a Guest network(GWLAN) service, which is a wireless internet connection service for short-term visitors, available in almost
all J-PARC buildings. In the end of 2014, additional
network service called User LAN has started. To use
the GWLAN, users are required to receive a password
at the J-PARC Users Office beforehand, while in theUser LAN they are authenticated by the same ID andpassword for the User Support System, which is also
used for dormitory reservation and so on. From March
2016, a new service called “eduroam” has been started.

The eduroam (https://www.eduroam.org/) is a secureroaming access service developed for the international
research and education community and mutually usedamong a huge number of research institutes, universities, and other institutions around the world. The
eduroam service will be a convenient third option ofinternet connection service for J-PARC visitors. Figure 7
shows this FY usage statistics of GWLAN, User LAN andthe newly introduced eduroam service.

Information System

J-PARC Annual Report 201936

Fig. 7. Usage trends of GWLAN, User LAN and eduroam.

Status of Computing
Since J-PARC does not have computing resources
for physics analysis, starting from 2009, the KEK centralcomputing system (KEKCC) at the KEK Tsukuba campus
has been mainly used for that purpose. At the Neutrino(T2K), Hadron and Neutron (MLF) experiments, the datataken in J-PARC are temporarily saved at their facilities
and then promptly transferred, stored, and analyzed at
the system in Tsukuba. The storage of the system is also
be utilized as a permanent data archive for their data.

The second upgrade of the system was completed in 2016, and the computing resources assigned
to J-PARC are shown in Table 1. The system will be
upgraded in 2020. Figure 8-10 show the utilization statistics of the computing resources in FY2019. The mainusers who used the CPU and storage constantly werefrom the Hadron experiment and the Neutrino groups.
The MLF group also started to store data to tapes on
the system.

%

Table 1. Assigned computing resources to J-PARC activities in the KEKCC.

CPU (Intel Xeon E5-2697v3)

4700 cores

RAID Disk (GPFS)

4.5 Peta Bytes

Tape (HSM)

27 Peta Bytes

CPU Utilization

100
80
60
40
20
0

HadronNeutrino

MLF

Other KEK users

Fig. 8. CPU usage statistics of KEKCC in FY2019.

J-PARC Annual Report 2019

Information System

37

Fig. 9. Disk usage statistics (Left: trend for this FY year; Right: annual trend).

Fig. 10. Tape library usage statistics (Left: trend for this FY year; Right: annual trend).

Transmutation Studies

Overview
We are developing nuclear transmutation technology with accelerator-driven systems (ADS) using
the J-PARC’s research resources and expertise in highpower accelerator and target technologies. The ADS isan effective nuclear system for volume reduction andmitigation of harmfulness of high-level radioactive
waste produced in nuclear reactors. We believe that
the ADS is one of the most beneficial applications ofhigh-power accelerators that contribute to society.
The baseline design of the J-PARC Transmutation
Experimental Facility (TEF) was completed in FY2017(JAEA-Technology 2017-003 and 2017-033). To makethe facility more attractive and effective by introducing leading edge knowledge to its purpose andspecifications, we are transforming the concept of

the TEF to a new one. The main purpose of the newfacility is to acquire irradiation damage data of ADS’s
beam window materials by impinging a proton beam
to a lead-bismuth eutectic target, in which the sample
materials are located. In addition, it is under consideration to irradiate directly the beam window andtarget materials used in high-power accelerator facilities, such as J-PARC, with the proton beam to acquire
irradiation data of the materials and ensure a safe andefficient operation of those facilities. We also plan toequip the new facility with a hot laboratory for efficient post-irradiation examination (PIE). Accordingly,
it is expected that the new facility would contributenot only to the development of ADS but also to theupgrade of J-PARC’s existing facilities.

Transmutation Studies

J-PARC Annual Report 201940
We have continued our R&D activities to support
the design of the experimental facility and ADS. We
are developing LBE target technologies applicable inthermal-hydraulics, materials corrosion, instrumentation, including oxygen concentration control, and are
acquiring operation experience by using two large
LBE circulation loops, and so on. We have continued
our work on other projects, such as measurement of
nuclear data needed for ADS designs, development ofproton beam monitors, which can withstand a highpower proton beam, design of an accelerator for ADS
and prototyping of a super-conducting cavity. We havealso continued our reactor physics experiments byusing critical assemblies. Details of these R&D activities
are described in this chapter.
On February 14 and 15, 2020, the sixth TEF
Technical Advisory Committee (T-TAC), one of thetechnical advisory committees under the J-PARC
International Advisory Committee, was held (Fig. 1).

In addition to the usual reports on our progress in the
R&D activities, in this T-TAC, we described specificallyour future R&D plans. The T-TAC gave us the following consideration: “this planning is feasible provided
that particular attention is given to the alignment
between the deliverables to be provided by the Target
Technology developments and the needs of the design
works for the Irradiation Facility.”

Fig. 1. T-TAC members and attendees.

Research and development
Studies for the spallation target for ADS
The experimental studies to establish the leadbismuth eutectic (LBE) spallation target for ADS
development have been progressing. Within the LBE
loop experiment, a heat exchange experiment has
been performed by using IMMORTAL (Integrated Multifunctional MOckup Real-scale TArget loop). Regarding
the material properties study, oxygen concentration(OC) control tests in OLLOCHI (Oxygen-controlled LBE
LOop Corrosion tests in HIgh-temperature) started. The
developments of a laminated thin plate (LTP) type oxygen sensor and an electro-magnetic (EM) flow velocity
probe are progressing. The development of a remotehandling technology for target maintenance is also
advancing. The results are described in detail below.
IMMORTALIn the IMMORTAL loop, LBE is heated by a module
heater and cooled by a heat exchanger (PHX), which
utilizes pressurized water. A heat transfer performance
between the heated LBE and pressurized water wasobserved to measure the prediction accuracy of system analysis programs for the LBE system. To improve
the simulation further, a more precise flow controller
was installed to the secondary system of IMMORTAL.
In near future, more detailed experimental data will be

provided by modifying the instrumentation to increase
the calculation accuracy of the safety analysis programs.
OLLOCHI
Since the last year, the dissolved OC control tests
in LBE have been carried out to obtain loop-specificparameters necessary for the automatic OC controlled
operation. The automatic OC control tests started in
January 2020. We managed to maintain the OC automatically within a certain range by mixing inlet gases.
We will continue to carry out automatic control tests
assuming actual corrosion test conditions, and thenstart long-term corrosion tests in FY2020.

Fig. 2. Outline of the automatic OC control system for OLLOCHI.

J-PARC Annual Report 2019

Transmutation Studies

41
Oxygen sensor development
Although a developed oxygen sensor worked wellunder the LBE flow environment, a conventional sensor
cannot eliminate the possibility of ceramic tube’s breakage. To provide a more robust one, development of“Laminated Thin Plate (LTP)” type oxygen sensor shownin Fig. 3 (a) was performed in cooperation with a sensor
production company.

which disturbs the precise detection of local flow velocity due to linearity loss of the probe. To overcome theissue, a miniature electromagnet was manufactured
and adopted to the probe as a source of constantmagnetic flux density. Figure 4 shows the originally
manufactured electromagnet type EM probe with 6
mm of outer diameter and 155 mm of length.
Before applying the EM probe to a high-temperature LBE, preliminary experiments were carried out in a
mercury test loop. As a result, the manufactured probe
was successfully calibrated and the local flow velocity
distributions in the square flow channel were measured
successfully. As a next step, the manufactured EM probe
will be tested under a high-temperature LBE flow up to500 ˚C in FY2020.

Fig. 3. Photograph of the LTP type of oxygen sensor (a) Exterior of the sensor, (b) Exterior of the LTP element

Several plates having different functions, such as
an electrode and a guide spacer for reference materials,
are laminated to the small single LTP element shownin Fig. 3 (b) (66 mm in length, 4.2 mm in width and1.65 mm in height). This structure drastically improves
the robustness. Furthermore, the necessary space forhandling is reduced significantly and it may have a
possibility to detect local oxygen potential becauseof the small sensing area of LTP. Experimental resultsof the LTP type showed sufficient performance above
250˚C under saturated OC condition. The output error
was estimated below 1%, which satisfied sufficiently
the design requirements. After specific modification to
improve stability and wettability, the LTP sensor will be
installed in several LBE test loops to perform OC control
test and to confirm the durability of the sensor underflowing LBE condition.
EM flow velocity probe development
Measurement of local flow velocity in LBE underoperation condition of LBE spallation target or ADS isimportant to verify the existing CFD codes. In order
to measure local LBE flow velocity, development ofelectro-magnetic (EM) probe for flow velocity measurement has been started. The probe works on the basis of
Faraday’s law. Normally, the probe consists of a permanent magnet, electrodes and an outer tube. However,if the LBE temperature changes, attenuation of themagnetic flux density of the permanent magnet occurs,

Fig. 4. The originally manufactured EM flow velocity probe.

Remote handling technology
To establish the exchange method of LBE spallation
target components, a remote handling technology
based on cutting / welding the system piping has beendeveloped. In order to perform a series of planned
remote operation procedures, prototype devices basedon commercially available equipment have been developed. To figure out the issues in the planned remote
operation procedure, demonstrative tests were performed using a mock-up of the target vessel with

Fig. 5. Outline of the remote handling test device.

Transmutation Studies

J-PARC Annual Report 201942
piping and prototypical remote devices, as shown in
Fig. 5. As a result of the mock-up tests, the procedure
was completed without significant failures. To make thework more efficient and reliable, improvement of thetools and jigs is underway.
Experimental program on nuclear data for ADS
using FFAG accelerator
An experimental program on nuclear data forresearch and development of ADS was launched in
October 2019, entrusted by the ministry of Education,
Culture, Sports, Science and Technology of Japan(MEXT). This program consists of two subprograms:
neutron energy spectrum measurement and highenergy fission measurement. It will continue until fiscal
year 2022. The experiment of the first subprogram will
be conducted in the middle of fiscal year 2020, and thesecond experiment will start from fiscal year 2021. This
program focuses on nuclear data at incident energies
from several tens of MeV to 100 MeV, which is the mostdifficult area to predict by theoretical nuclear models.
To this end, we will use proton beams produced by the
Fixed-Field Alternating Gradient (FFAG) accelerator at
Kyoto University.
In the first subprogram, energy spectra of neutrons
produced from the proton-induced nuclear reaction
will be measured with the time-of-flight (TOF) technique using liquid organic scintillation spectrometers.
To meet the requirements of the TOF experiment, thissubprogram includes an improvement of the FFAG
accelerator, in which the pulse width will be reduced
from the present specification of ~10 ns by the bunchrotation technique. Lead, bismuth, and iron, which aremajor constituent materials of the ADS, will be used as
237
target materials. Furthermore, the fission rate of Np
at the produced neutron field will be measured. In thesecond subprogram, the mass number distribution offission fragments produced from heavy target materials, such as lead and bismuth, will be measured with the
combined use of micro-channel plates and multi-wire
proportional counters. Moreover, fission neutrons willbe also measured by the neutron detectors.
Measurement of nuclide production cross sections
by high-energy protons at J-PARC
In the high-energy accelerator facilities such as ADS,
radioisotopes are produced by high-energy nuclear
reactions. In such facilities, production yields of radioisotopes must be predicted for the shielding designand dose assessment. To estimate the production

yields of radioisotopes, nuclide production cross section data are required for various target materials. We
have systematically measured the nuclide production
cross sections for various target materials induced by
GeV-order protons.
The radioisotopes produced in an irradiated sample foil can be derived by measuring a γ-ray energy
spectrum. In the spectrum, some sharp peaks areobserved, which correspond to γ-ray energies emitted
from each production nuclide. Figure 6 shows examples of nuclide production cross sections for Ni and Zr
targets. Theoretical calculations and cross section datataken from nuclear data library are also shown. Among
51
54
58
the nuclides shown in Fig. 6, Cr, Mn, and Co, whichhave a relatively long half-lives and high activities, areparticularly important for dose assessment in the accelerator facilities. For the Zr target, the experimental data
were much scarcer than for the Ni target. The cross sec81
tion of Zr(p,X) Rb was successfully obtained for protonenergy higher than 1 GeV as the first experimental data.
It was observed that the calculations and the nuclear
data library underestimated the cross sections for these
nuclides, which will be improved in future work.

Fig. 6. Present experimental production cross-sections of Ni
and Zr irradiated with protons.

Displacement cross-section measurement
As an index of radiation damage to materials, displacement per atom (dpa) is widely used in many fields,such as fission and fusion reactors, and accelerator

J-PARC Annual Report 2019

Transmutation Studies

43
facilities. The dpa is evaluated by integrating a particle flux by the displacement cross-section. Since theexperimental displacement cross section data for the
protons with energies used in the ADS were scarce, theexperiment was conducted in J-PARC, as a program
entrusted by the MEXT. The displacement cross-section
could be delivered from an electric resistivity increaseof a sample by proton irradiation. To prevent the defectfrom recovering by the thermal motion of atoms, thesample was cooled less than 4 K by using a cryocooler.
The experimental instruments were installed at thebeam channel extracted from the RCS and Main Ring
(MR) in J-PARC.
The first experimental data [1] of iron were successfully obtained for the protons with the kinetic energy
utilized in the ADS. The present result of the displacement cross-section of iron is compared in Fig. 7 withthe experimental data carried out in the lower energy
region and the calculation. PHITS with the improved
model with athermal recombination correction (arc)model showed remarkably good agreement with theexperimental data. From the present experimental
campaign, the displacement cross-section data of Al,
Fe, Cu and W were successfully obtained. The program
entrusted by the MEXT was successfully completed by
the end of fiscal year 2019.

Fig. 8. The Horizontal evolution of the root-mean-square (reddashed-dotted line) and the maximum envelope for-6
beam fraction < 10 (blue dashed line).

Cross section [b]

107
Fe

106
105

Present
Jung

104
103

the emittance growth, it is possible to reduce the beam
halo; consequently, decrease the beam loss [2].
The robustness of the lattice was tested by multiparticle tracking using a large number of particles,
7
about 1x10 , to achieve an accurate description of
the beam behavior. Figure 8 presents a smooth evolution of the horizontal beam size and the maximum
beam envelope, which corresponds to the beam frac-6
tion lower than 10 , remains below the aperture. The
beam dynamics results, of the JAEA-ADS linac, showeda proper control of the emittance growth and the beamhalo, which confirmed the absence of beam loss along
the lattice.

PHITS
NRT model
arcmodel10210-7 10-6 10-5 10-4 10-3 10-2 10-1 100 101
Proton kinetic energy [GeV]
Fig. 7. Displacement cross-section of iron obtained by thepresent experiment.

Proton accelerator for ADS
One of the biggest challenges for the high-intensity
proton linac for ADS is to operate the accelerator witha beam loss level lower than 1 W/m, to allow hands-on
maintenance. The beam halo, the particles which are
the outermost region of the distribution, is the main
source of particle loss, and the beam halo is associatedwith the emittance growth. As a result, by controlling

MA irradiation experiments
To develop an accelerator-driven system (ADS), it isnecessary to verify the nuclear data of minor actinides(MAs) in a fast neutron core, such as the transmutation
physics experimental facility (TEF-P) designed in J-PARC.
As planned in TEF-P, one of the verifications is to use fission chambers containing MA as fissionable material
235
and a well-known material such as U as reference in
critical or sub-critical core, where neutron spectrum in
ADS core can be simulated. To achieve high-accuracy
verification, precise fabrication of the chamber (e.g.
accountancy and purity of MA, uniformity of MA layer,
and hermeticity) is important, but the fabrication itself
requires R&D because the preparation of pure raw MA
and its treatment are possible in a very limited numberof facilities. We have recently fabricated several cham237
241
243
244
bers containing Np, Am, Am or Cm in NUCEF
243
235
in JAEA and measured the ratio of the Am and U
fission reaction rates at the Kyoto University Critical
Assembly (KUCA).

Transmutation Studies

J-PARC Annual Report 2019

44
243

235

The irradiation experiment of Am and U was
conducted at A-core in KUCA shown in Fig. 9. Fission
reaction rates were measured by using the JAEA single
fission chamber shown in Fig. 10, which has a foil, such235
243
as U (10 μg) or Am (12 μg). The simultaneous mea243
235
surement of Am and U fission reaction rates was
conducted at the center voided region. The pulse height
distributions from the fission chambers were acquired
under the condition of critical core corresponding to areactor power of 3.5 W. The irradiation time was 1 hour.
243
The distributions of pulse height of Am and235
U fission reactions were observed, as shown in Fig.
11. The fission reaction signals need to be separated
from noises due to α and γ rays in a small pulse height.
243
235
The fission reaction events of Am and U in Fig. 11
were determined by integrating the counts at voltages
greater than 0.589 and 0.592, respectively. As a result,243
235
the effective total fission counts of Am and U were

estimated to be 5,208 and 118,664, respectively. Finally,243
235
the fission reaction rate ratio of Am and U was
obtained by the total counts and the number of atoms,
and a detection efficiency of the fission chamber was
0.042 ± 0.002. These experimental data will be usable
for verification of evaluated nuclear data by conducting
detailed analyses [3].

Fig. 10. Photograph of the JAEA single fission chamber.
10000
235U

Counts

1000

243Am

100

10

1

0.0

1.0

2.0

3.0

4.0

Pulse height (V)Fig. 9. Photograph of A-core in KUCA facility.

Fig. 11. Fission signals of the 243Am and 235U fission chambers[3].

International cooperation
We are collaborating closely with the Belgian
Nuclear Research Centre (SCK CEN) for the ADS development under the collaboration arrangement between
SCK CEN and JAEA. SCK CEN is promoting the MYRRHA(Multi-purpose hYbrid Research Reactor for High-tech
Application) project, which is the world’s first large
scale ADS project at power levels scalable to industrial
systems.
On April 4 and 5, 2019, four members of the
J-PARC staff visited the MYRRHA accelerator team for
information exchange on the development of a superconducting linac for ADS. One of the important topics

discussed was how to achieve considerably high operation reliability needed for ADS’s accelerators to drive
subcritical reactor cores. One of J-PARC’s representatives, Dr. Jun Tamura, joined the MYRRHA accelerator
team for a year from January 2020 to enhance mutual
collaboration.
On November 27, 2019, we welcomed seven SCK
CEN’s delegates including Dr. Eric van Walle, who was
the Director-General of SCK CEN, to discuss future collaboration between SCK CEN and JAEA (Fig. 12). At
the meeting, we agreed to enhance the mutual collaboration in the field of ADS development, including

J-PARC Annual Report 2019

Transmutation Studies

45
LBE technology, materials irradiation, and accelerator
technology.
On February 4 and 5, 2020, three SCK CEN’s scientists visited JAEA to hold a technical meeting under
the Collaboration Arrangement. The meeting wasattended by many JAEA staff including J-PARC Center
who were involved in the development of ADS. Recent
progress and future collaboration items on two main
topics, LBE technology and neutronics, were discussed.
In addition, JAEA and the Karlsruhe Instituteof Technology in Germany decided to sign anarrangement for research collaboration in the ADS
development, especially in the field of high-power LBE
target technology, which was one of the important
themes studied at the J-PARC Center.

Reference[1] H. Matsuda, et al, J. Nucl. Sci. Technol. Doi:
10.1080/00223131.2020.1771453.
[2] B. Yee-Rendon, et al, J. Phys. Conf. Ser. 3501, 12120 (2019).
[3] A. Oizumi et al., KURNS Progress Report 2019, (in printing).

Fig. 12. Visit of SCK CEN’s delegates.

SafetySafety

J-PARC Annual Report 201948

Safety1. Major events on safety culture and safety activities at the J-PARC Center
The major events on safety culture and safety activities at the J-PARC Center are listed in Table 1.
Every year since 2014, the J-PARC Center has held
workshop 5.23 for fostering safety culture to keep freshthe lessons of the radioactive material leak incident
at the Hadron Experimental Facility on May 23, 2013.
A “Safety Day” was launched two years ago, which, in
addition to workshop 5.23, also includes a discussionof the safety culture. The safety day took place on May
24. In the morning, we held a meeting between thesections to exchange information on the safety efforts.
The number of participants was 104. The director of
the J-PARC Center gave away three “Safety Awards forgood examples”. The neutron science section/technology development section/CROSS received one because
they reported more good examples of safety in their
daily works than the other sections. Another was given
to accelerator section 1 and the hadron section, because
they reported creative good examples. The third wasgiven to the neutron science section/technology development section/CROSS, because they reported good
examples with consideration for hygiene.
Mr. Fumihiro Saito from the radiation control section gave a scientific talk with the title “If the beam
operation is done with the worker in the accelerator tunnel… -Study on quick and simple estimation
method of exposure dose”. Dr. Hidetaka Kinoshita fromthe neutron source section introduced the safety workof the MLF facility under the title “On-site transportation of used mercury target container”. Also, Dr. Kazuo
Gorai from the information system section introduced
the safety work under the title “Response and countermeasures against the fire of the temporary generator”.
In the afternoon part of the Safety Day, workshop
5.23 for fostering safety culture was held at the auditorium of the Nuclear Science Research Institute with
278 attendees. Dr. Yayoi Ngai, representative of the
Office Style Road was invited this year; she spoke about“the power of people necessary” for a strong and safeorganization.
The emergency drill was carried out on January 9,
2020. It assumed an abnormal release of radioactive
materials into the MLF facility environment during theoperation of the accelerator. The main purpose of thedrill this year was to practice the appropriate response

Fig. 1. Emergency drill

from the initial reaction until the event was contained.
The J-PARC Safety Audit in FY2019 was conductedby two external auditors (Prof. Akira Tose from Niigata
University and Dr. Katsumi Hayashi from the Institutionof Professional Engineers) on December 16. After completing their observations, the auditors recommended
that all stakeholders involved in J-PARC foster a safety
culture by safe and stable use of the equipment, which
will lead to achieving excellent research results.
2. Radiological license update and facility inspection
Applications to update the radiological license were
submitted to the Nuclear Regulation Authority on May
30 and December 6. The major application items arelisted in Table 2. The permits for the applications were
issued on June 12 and on April 28, 2020, respectively.
There were no cases requiring a facility inspection in
FY2019.
3. Meeting of the committee on the radiation safety
matter
The basic policies on radiation safety in the J-PARC
are supposed to be discussed by the J-PARC Radiation
Safety Committee (RSC). Meanwhile, the J-PARC
Radiation Safety Review Committee (RSRC) is expected
to discuss specific subjects of radiation safety in the
J-PARC. The RSC held one meeting and the RSRC met
three times during FY2019. The RSC meeting scheduled
for March 2020 was postponed due to the coronavirus.
The major issues are summarized in Table 3.
4. Radiation exposure of radiation workers
In FY2019, 3254 persons were registered as radiation workers. In the last five years, the numbers of

J-PARC Annual Report 2019

Safety49
workers fluctuated between 3000 and 3500.
The distribution of annual exposed doses issummarized in Table 4 for each category of workers: inhouse staff, users, and contractors. The exposed dosesof gamma-rays and of neutrons were measured with an
optically stimulated luminescence (OSL) dosimeter andwith a plastic solid-state track detector, respectively.

The exposure of all users and almost all of the in-housestaff and contractors were below the detection limit(Not Detected, expressed as “ND” in the table). The maximum exposed dose was 1.1 mSv. Though it was lessthan the administrative dose limit at the J-PARC (7 mSv/
year), we should continue to make efforts to reduce theexposed doses of all workers.

Table 1. List of major events on safety in FY2019.

Day

EventsMay 24, 2019

Safety Day (Meeting to exchange safety information between all sections, Workshop for fostering safety culture)

June 26, 2019

Liaison committee on safety and health for contractors

September 3, October 4, 17,November 6, 8, 2019

Refresher course on radiation safety for the in-house staff

December 16, 2019

FY2019 J-PARC Safety Audit

January 9, 2020

Emergency drill assuming an abnormal release of radioactive materials into the
MLF facility environment during the operation of the accelerator

January 23 - 24, 2020

7th Symposium on Safety in Accelerator Facilities

Table 2. Major application items of the radiological license

Facility

Items of an application

Li• Change of the installation position of the particle count monitor

RCS• Change of the safety interlock structure• Addition to the purpose of use (research of the material science)MR• Addition of description concerning the proton beam irradiation experiment• Change of beam loss
• Construction of a new primary beam line (B-line)• Beam intensity: 4.3 × 1016 → 7.1 × 1016 protons/hourHD• Construction of a new primary beam line (B-line)• Addition of a storage facility for induced radioactive materials

NU• Expansion of the controlled areaAll

• Optimization of the application document

Safety

J-PARC Annual Report 201950
Table 3. Radiation Safety Committee (RSC) and Radiation Safety Review Committee (RSRC) in FY2019

No.

Date

Major Issues

The Radiation Safety Committeeth34• Nomination of committee chair and deputy chair• Materialization of deliberation matter concerning safety at J-PARC• Report of radiation exposure status in FY2018• Report of radioactive waste emission (exhaust air and drain water) in FY2018

July 31, 2019

The Radiation Safety Review Committee
24

May 31, 2019

• Report of radiation exposure status in FY2018• Update of the radiological license for the HD and NU facilities• Decision of assumed events requiring emergency responsesth

October 8, 2019

• Report of correction of the dose evaluation value at the J-PARC site boundary• Report of preparation of the interlock handling guide• Revision of the Detailed Rule of Local Radiation Protection Rule for J-PARC• Revision of the RSRC Rule
• Decision of emergency responses for assumed events described in the operation guides

stFebruary 7, 2020

• Revision of the accident-response activity guide• Revision policy of the operation guide for the HD facility• Use of the X-ray generator at the JRB facility

th

25

26

Table 4. Annual exposed doses in FY2019

Dose range x (mSv)# ofworkers5.0< x

Collective dose
(person · mSv)

Maximum dose
(mSv)

ND

0.1≤ x ≤1.0

1.0< x ≤5.0

In-house staff

695

666

28

1

0

12.4

1.1

Users

1,197

1,197

0

0

0

0

0

Contractors

1,367

1,294

73

0

0

21.5

0.8

Total

3,254

3,152

101

1

0

33.9

1.1

User Service

User Service

J-PARC Annual Report 201952

Users Office (UO)
Outlineas a J-PARC User, radiation worker registration, safety
education, accommodation, invitation letter for visa
and other requirements. Then, the UO staffs provide
them with support by e-mail. After their arrival at the
J-PARC, UO gives on-site assistance to the J-PARC Users, like receiving the J-PARC ID, glass badge, and safety
education. Since 2015, UO had been doing its part toimprove the J-PARC on-line experiment system andmake it more user-friendly
After the experiments. UO may return the experiment samples at User’s cost after radioactivity cools
down.

The J-PARC Users Office (UO) was established in2007. It opened an office on the first floor of the IBARAKI Quantum Beam Research Center in Tokai-mura, in
December 2008. UO maintains the Tokai Dormitory for
the J-PARC users. UO provides on-site and WEB support
with one-stop service for the utilization of the J-PARC.
As of March 31, 2019, UO had 13 staffs and 4 WEB Support SE staffs in the Users Affairs Section. The J-PARC
Users, after the approval of their experiment, follow
the administrative procedures outlined on the Users
Office (UO) WEB Portal Site, related to the registration

1 Hitachi
Minami-ohta

Tokai Campus
Niken-jaya
intersection

TOKAI
Smart IC

J-PARC Users Office

Tokai Village
OfficeJAEA Main Gate
(Central Security Office)[J-PARC]

Cocos
restaurant
62

PC depostore

Kakeagariintersection

Post Office

Tokai Hospital

JR Tokai
StationMobile 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

Map to J-PARC Users OfficeJ-PARC Annual Report 2019

User Service

53

Activities of UO

J-PARC Users

Technical
contact
personTechnical
supportResearch
Proposal

J-PARC Users Office
Procedures for
J-PARC site access• ID card• Portal site
• Rental goods

Proposal
Advisory
Committee

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

on the web
Step 1

on-site support

User registration

New user

Registered user

Getting user ID

Annual registration, specifyingof the visit

Approval of UO

Step 3
Procedures upon arrivalat the first day
Recieve J-Parc User ID card
Vehicle Permission pass

Step 2-1 Obligatory application
Application form to visit J-PARC
Visit proposal (foreign nationality)
Reservation of safety training
On-line education video

Step 2-2

Optional application

J-PARC Card for facility accessNetwork registration
Radiation worker registration
Reservation of Dormitory
Invitation letter for Visa

Safety education and dosimeter

Users Office at IQBRC

Office hours(9:00-17:00, Mon.-Fri.)

Rental goods
BicylePHS
Cafeteria card
Locker key
Office key

Rental bicycle

Step 4 J-PARC Experiment and meeting
Step 5 Leaving procedures
Retern all cards, keys, rental goods UO(office hours) or return box!

Return box at IQBRC

User Service

J-PARC Annual Report 201954

User Statistics
Users in 2019 (Japanese ⁄ Foreigners, person-days)
4,000

Foreigners
3,500Japanese

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

4
2019

5

6

7

8

9

10

11

12

1
2020

2

3

Users in 2019(according to organizations, person-days)

Users in 2019(according to facilities, person-days)
Accelerator
1,817

Other 22

Foreign
Organizations
8,761

Neutrino
7,357

Japanese
Universities
18,674MLF
16,204
PrivateEnterprises
1,266

Hadron5,148

PublicOrganizations
1,803

HadronMLF

Neutrino

Japanese Universities
Foreign Organizations

Accelerator

（人日）

（人日）

3,000

2,500

2,500

Public Organizations
Other

Private Enterprises

2,000

2,000
1,500
1,500
1,000
1,000
500

500
0

3

2

.1

12

20
20

11

9

10

8

7

6

5

.4
19
20

3

2

.1

12

11

9

8

7

6

5

10

20
20

20

19

.4

0

J-PARC Annual Report 2019

User Service

55

MLF Proposals Summary - FY2019
Table 1. Breakdown of Proposals Numbers for the 2019 Rounds
2019A

Beamline

2019B

Full Year

Submitted Approved Submitted Approved

Instrument

GU

GU

GU

GU

Submitted

Approved

PU/S

PU/S

IU

IU

BL01

4D-Space Access Neutron Spectrometer - 4SEASONS

16(0)

13(0)

26(1)

12(1)

1

1

1

1

BL02

Biomolecular Dynamics Spectrometer - DNA

12(0)

8(0)

29(3)

10(3)

2

2

2

2

BL03

Ibaraki Biological Crystal Diffractometer - iBIX

1

0

1

1

0

0

0

BL04

Accurate Neutron-Nucleus Reaction Measurement Instrument - ANNRI(100-β)
(β)

‡

†

0

0

0

0

43

10

4

11

4

1

※

0

43

1

1

0
※

0
1

BL05

Neutron Optics and Physics - NOP

5

5

5

5

1

0

1

0

BL06

Neutron Resonance Spin Echo Spectrometers - VIN ROSE

4

3

4

2

1

0

1

0

BL08

Super High Resolution Powder Diffractometer - S-HRPD

14

10

17

12

1

0

1

0

BL09

Special Environment Neutron Power Diffractometer - SPICA

6

3

4

4

1

0

1

0

BL10

Neutron Beamline for Observation and Research Use - NOBORU

8

8

13

7

3

1

3

1

BL11

High-Pressure Neutron Diffractometer - PLANET

9(0)

9(0)

15(0)

10(0)

0

1

0

1

BL12

High Resolution Chopper Spectrometer - HRC

5

5

10

5

1

0

1

0

BL14

Cold-neutron Disk-chopper Spectrometer - AMATERAS

27

11

37

10

3

1

3

1

BL15

Small and Wide Angle Neutron Scattering Instrument - TAIKAN

38(2)

14(2)

59(0)

13(0)

3

3

3

3

BL16

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

21

18

21

20

0

1

0

1
3

BL17

Polarized Neutron Reflectometer - SHARAKU

19(2)

16(2)

27(2)

13(2)

1

3

1

BL18

Extreme Environment Single Crystal Neutron Diffractometer - SENJU

13(0)

8(0)

25(1)

5(1)

1

1

1

1

BL19

Engineering Diffractometer - TAKUMI

16

12

24

14

1

1

1

1

BL20

Ibaraki Materials Design Diffractometer iMATERIA

0

BL21

(100-β)

‡

10

5

14

8

0

0

0

42

42

25

25

25

0

25

0

High Intensity Total Diffractometer - NOVA

22

20

25

19

1

0

1

0

(β)

†

BL22

Energy Resolved Neutron Imaging System - RADEN

17(0)

13(0)

21(0)

11(0)

1

2

1

2

BL23

Polarization Analysis Neutron Spectrometer - POLANO

2

2

2

2

1

0

1

0

D1

Muon Spectrometer for Materials and Life Science Experiments - D1

17(0)

8(0)

18(1)

8(1)

0

1

0

1

D2

Muon Spectrometer for Basic Science Experiments - D2

8(1)

4(0)

12(4)

6(2)

0

1

0

1

S1

General purpose µSR spectrometer - ARTEMIS

30(2)

25(1)

29(3)

23(3)

1

1

1

1

UA

Muon U
Total

0

0

0

0

0

1

0

1

369

265

473

253

86

22

86

22

GU : General Use
PU : Project Use or Ibaraki Pref. Project Use
S : S-type Proposals
IU : Instrument Group Use† : Ibaraki Pref. Exclusive Use Beamtime (β = 80% in FY2019)‡ : J-PARC Center General Use Beamtime (100-β = 20% in FY2019)( ) : Proposal Numbers under the New User Promotion (BL01, BL02, BL11, BL15, BL17, BL18, BL22) or
P-type proposals (D1,D2, S1) in GU※ Proposal rounds are held twice per year (for each of the A and B periods), with only the yearly total shown above.
The actual total number of proposals in each beamline named in the table does not match the number shown in
the “Total” cell, because some proposals are submitted or approved across multiple beamlines.

User Service

J-PARC Annual Report 201956
Table 2. Proposals Numbers of Long Term Proposal for the 2019 Rounds
Application FY

Submitted

Approved

2017

24

8

2018

9

5

2019

9

4

1000
800

329

Proposals

199
600
400

34
67

214

FY2008FY2009293

Not Approved

231

Approved

395
126

42

45

20

200
0

278

142

309

255

FY2010FY2011422

469

FY2013

FY2014460

FY2012

507
321

353

FY2015FY2016FY2017607

630

FY2018FY2019Proposal RoundFig. 1. MLF Proposal Numbers over Time

CROSS
24
2%
JAEA
80
8%

KEK
48
5%
Universities (Japan)
Companies (Japan)
Universities (Japan)
412
43%Foreign Organizations
216
23%

Research Institutes (Japan)
Foreign Organizations
JAEA
KEK
CROSS

Companies (Japan)
130
14%Research Institutes (Japan)
49
5%Fig. 2. Origin of Submitted Proposals by affiliation - FY2019

P9
11
2%

Q1
50
7%

Q2
62
8%

P1: Materials Science and Engineering
P2: Energy Science and High-Pressure Science

P1
153
20%

P7
59
8%

P3: Soft Matter, Biomaterials and Liquids
P4: Magnetism and Strongly Correlated Electron Systems (Elastic Scattering)
P2
76
10%

P6
64
8%
P5
94
12%

P4
64
8%

P3
126
17%

P5: Magnetism and Strongly Correlated Electron Systems (Inelastic Scattering)P6: Fundamental and Nuclear Physics, Instrumentation, Imaging
P7: Industrial Applications
P8: (Reserved)
P9: Trial Use Access Program
Q1: Electronic Properties of Matter & Hydrogen in Matter
Q2: Hydrogen in Matter & General Applications

Fig. 3. Submitted Proposals by Sub-committee/Expert Panel – FY2019

J-PARC Annual Report 2019

User Service

57

J-PARC PAC Approval Summary for the 2019 Rounds
E03
P04

(Co-)
Affiliation
Title of the experiment
Spokespersons−
K.Tanida
JAEA
Measurement of X rays from Ξ Atom
U of Illinois at
J.C.Peng;
Measurement of High-Mass Dimuon Production at the
UrbanaS.Sawada
50-GeV Proton Synchrotron
Champaign; KEK
Spectroscopic Study of Ξ-Hypernucleus,−+C(K , K ) Reaction

12
Ξ

Be, via the

Approval status(PAC recommendation)
Stage 2

K1.8

DeferredPrimary

Stage 2New experiment E70 based on the
S-2S spectrometer

K1.8

Beamline

E05

T.Nagae

Kyoto U

12

E06

J.Imazato

KEK

Measurement of T-violating Transverse Muon Polarization+
0 +E36 as the first stepin K -> π μ ν Decays

K1.1BR

Systematic Study of Double Strangeness System with an
Stage 2
Emulsion-counter Hybrid Method

K1.8

E07
E08
E10
E11
E13
E14
E15
E16
E17
E18

K.Imai,
JAEA, Gifu U,
K.Nakazawa,
Tohoku U
H.Tamura
A.Krutenkova ITEP
A.Sakaguchi,
T.Fukuda
T. Nakaya,
M. Wascho
H.Tamura
T.Yamanaka
M.Iwasaki,
T.NagaeS.Yokkaichi

R.Hayano,
U Tokyo, RIKEN
H.OutaH.Bhang,
SNU, RIKEN,
H.Outa, H.Park KRISS

E19

M.Naruki

E21

Y.KunoE22

S.Ajimura,
A.Sakaguchi

T25

S.Mihara

E26

K.Ozawa

E27

T.Nagae

E29

H.Ohnishi

E31

H.NoumiT32

A.Rubbia

P33

H.M.Shimizu

E34

T. MibeE40

M.Kohl,S.Shimizu
K.MiwaP41

M.AokiE42

J.K.Ahn

E45

K.H.Hicks,
H.SakoT46
T49

K.Ozawa
T.Maruyama

E36

Pion double charge exchange on oxygen at J-PARC
Production of Neutron-Rich Lambda-Hypernuclei with
Osaka U, Osaka
the Double Charge-Exchange Reaction (Revised fromEC U
Initial P10)
Tokai-to-Kamioka (T2K) Long Baseline Neutrino
KEK
Oscillation Experimental Proposal
Tohoku U
Gamma-ray spectroscopy of light hypernuclei0
Osaka U
Proposal for KL -> π ν ν-bar Experiment at J-PARC
A Search for deeply-bound kaonic nuclear states by inRIKEN, Kyoto U
flight 3He(K-, n) reaction
Measurements of spectral change of vector mesons in
nuclei (previously “Electron pair spectrometer at the
RIKEN
J-PARC 50-GeV PS to explore the chiral symmetry in
QCD”)

KEK

3

Precision spectroscopy of Kaonic He 3d->2p X-rays
12
ΛCoincidence Measurement of the Weak Decay of C
and the three-body weak interaction process−−+
High-resolution Search for Θ Pentaquark in π p -> K X
ReactionsStage 1

K1.8

Stage 2

K1.8

StatusIn preparation

Finished

Finished
Data analysis
Li run finished,
Be target run
with S-2S

Stage 2neutrino Data taking

Stage 2
Stage 2

K1.8
KL

Finished
Data taking

Stage 2

K1.8BR

Finished

Stage 2 for Run 0

High pRegistered as E62 with an updated
proposal

K1.8BR

Stage 2

K1.8

Stage 2

K1.8

Phase-I Stage 2
An Experimental Search for μ − e Conversion at a
PAC recommends producing a more
−16
COMET
Sensitivity of 10 with a Slow-Extracted Bunched Beam detailed schedule to ensure a timely
start.
Exclusive Study on the Lambda-N Weak Interaction in
Osaka U
Stage 1K1.8
A=4 Lambda-Hypernuclei
Extinction Measurement of J-PARC Proton Beam at
KEK
Test Experiment
K1.8BR
K1.8BR
Search for ω-meson nuclear bound states in the π-+AZ ->
(A−1)
KEK
K1.8
n+ ω(Z-1) reaction, and for ω mass modification in the Stage 1
0
in-medium ω->π γ decay–+
Search for a nuclear Kbar bound state K pp in the d(π ,+Stage 2
K1.8
Kyoto UK ) reaction
Search for φ-meson nuclear bound states in the pbar +RIKEN
Stage 1
K1.1
AZ -> φ + (A-1)φ(Z-1) reaction
Spectroscopic study of hyperon resonances below KN−,
Osaka U
Stage 2
K1.8BR
threshold via the (K n) reaction on DeuteronTowards a Long Baseline Neutrino and Nucleon Decay
ETH, ZurichExperiment with a next-generation 100 kton Liquid
Test Experiment
K1.1BR
Argon TPC
Nagoya U
Measurement of Neutron Electric Dipole Moment
Deferred
Linac
An Experimental Proposal on a New Measurement of the
KEK, RIKEN
Muon Anomalous Magnetic Moment g-2 and ElectricStage 2MLF
Dipole Moment at J-PARC++++
Hampton U,
Measurement of Γ(K -> e ν)/Γ(K -> µ ν) and Search forStage 2
K1.1BR
Osaka U
heavy sterile neutrinos using the TREK detector system
Tohoku U
Measurement of the cross sections of Σp scatterings
Stage 2
K1.8
An Experimental Search for μ − e Conversion in Nuclear−14
Osaka U
Field at a Sensitivity of 10 with Pulsed Proton Beam
Deferred
MLF
from RCS
Pusan National Search for H-Dibaryon with a Large Acceptance Hyperon
Stage 2
K1.8
USpectrometer
Stage 2
PAC requests that the group further
3-Body Hadronic Reactions for New Aspects of Baryon
examine ways to reduce the total
Ohio U, JAEA
K1.8
Spectroscopy
beam time requested and to find an
efficient running scheme, including
quick but careful beam tuning.
KEK
EDIT2013 beam test program
Test Experiment
K1.1BR
KEK
Test for 250L Liquid Argon TPC
Test Experiment
K1.1BR

Finished

Osaka U

Finished

Fisnished

Finished
Data analysis
Finished

Finished
Data analysis
Data taking
Reviewed in
MLF/IMSS

Abandonded
Withdrawn

User Service

J-PARC Annual Report 2019

58
(Co-)
Spokespersons

Affiliation

E50

H.NoumiOsaka U

T51

S.Mihara

KEK

Title of the experiment−Charmed Baryon Spectroscopy via the (π,D* ) reaction

Approval status
Beamline(PAC recommendation)
Stage 1The FIFC, IPNS, and E50 shouldHigh pinvestigate the beam-line feasibility

Research Proposal for COMET(E21) Calorimeter Prototype
Test ExperimentBeam Test
Test of fine pixel CCDs for ILC vertex detector
Test Experiment
Test of GEM Tracker, Hadron Blind Detector and LeadTest Experimentglass EMC for the J-PARC E16 experiment
Test experiment for a performance evaluation of ascattered proton detector system for the Σp scattering Test Experimentexperiment E40
Second Test of Aerogel Cherenkov counter for the J-PARC
Test ExperimentE36 experiment
A Search for Sterile Neutrino at J-PARC Materials and Life
Stage 2
Science Experimental Facility

Status

K1.1BR

had to be
stoppednot performed yet

K1.1BRnot performed yet

K1.1BRnot performed yet

K1.1BR

had to be
stopped

K1.1BR

T52

Y.Sugimoto

KEK

T53

D.Kawama

RIKEN

T54

K.MiwaTohoku U

T55

A.Toyoda

KEK

E56

T.Maruyama

KEK

E57

J. Zmeskal

Stefan Meyer
Institute forSubatomic
Physics

P58

M. Yokoyama U. Tokyo

T59

A. Minamino

Kyoto U

T60

T. Fukuda

Toho U

E61

M. Wilking

Stony Brook U

E62

R. Hayano,S. Okada,
H. Outa

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

Stage 2

K1.8BR

Finished

E63

H. TamuraTohoku U

Stage 2

K1.1

BL not readyyet. Exp. in

T64

Y. Koshio

Okayama U

E65
T66

T. Nakaya
T. Fukuda

P67

I. Meigo

T68

T. Fukuda

E69

A. Minamino

E70

T. Nagae

E71

T. Fukuda

E72

K. Tanida

P73

Yue MaP74

A.FelicielloP75

H.Fujioka

P76

H.M.Shimizu

T77

Yue MaMeasurement of the strong interaction induced shift andStage 1width of the 1s state of kaonic deuterium at J-PARC

MLF
K1.8BRin preparation

A Long Baseline Neutrino Oscillation Experiment Using
Deferredneutrino
J-PARC Neutrino Beam and Hyper-Kamiokande
A test experiment to measure neutrino cross sections
neutrinousing a 3D grid-like neutrino detector with a water target To be arranged by IPNS and KEK-T2K monitor Finishedat the near detector hall of J-PARC neutrino beam-line
bld
neutrino
Proposal of an emulsion-based test experiment at J-PARC Arranged by IPNS and KEK-T2K
monitor Finished
bld
Stage 1
PAC encourages to refine thescientific and placement arguments
NuPRISM/TITUS
neutrino
in preparation for a new review
committee for IWCD (one of neardetectors of Hyper-Kamiokande)Gamma-ray spectroscopy of light hypernuclei II

Measurement of the gamma-ray and neutron
background from the T2k neutrino/anti-neutrino at
Arranged by IPNS and KEK-T2K
neutrino
J-PARC B2 Hall
Kyoto U
Proposal for T2K Extended Run
Stage 1
neutrino
Nagoya U
Proposal of an emulsion-based test experiment at J-PARC Test Experimentneutrino
Measurement of displacement cross section of proton in
Carry out the experiment within the
JAEA
energy region between 3 and 30 GeV for high-intensityMRframework of facility development
proton accelerator facility
Extension of T60/T66 Experiment: Proposal for the Run
Nagoya U
Test Experimentneutrinofrom 2017 Autumn
Study of neutrino-nucleus ineraction at around 1GeVYokohamausing cuboid lattice neutrino detector, WAGASHI, muon
Stage 2neutrino
National U
range detectors and magnetized spectrometer, Baby
MIND, at J- PARC neutrino monitor hall
Kyoto U
Proposal for the next E05 run with the S-2S spectrometer Stage 2
K1.8
Proposal for precise measurement of neutrinop-water
neutrino
Nagoya U
Stage-2
cross- section in NINJA physics run
Search for a Narrow Λ* Resonance using the p(K-, Λ)η
JAEA
Stage-2
K1.8BR
Reaction with the hypTPC Detector
3
4DeferredΛH and ΛH mesonic weak decay lifetime measurement
3,4
−
0 3,4
Submitted a test experiment
K1.8BR
RIKEN
with He(K , π ) ΛH reaction
proposal (P77)
Deferred
Direct measurement of the 3ΛH and 4ΛH lifetimes using
INFN, Torino
Decision of P74 proposal is after P73 K1.1
the 3,4He(π-, K0)3,4ΛH reactions
pilot run.
PAC recommends stage-1 approval
Decay Pion Spectroscopy of 5ΛΛH Produced byfor the Phase-1 run. The requested 7
Tokyo Inst. Tech,
K1.8
days of running for this measurement
Ξ-hypernuclear Decay
is appropriate.
Defferred
Searches for the Breaking of the Time Reversal Invariance PAC would be prepared for an
Nagoya U
MLF
in Polarized Epithermal Neutron Optics
evaluation when appropriatematerial is made available.
Feasibility study for 3ΛH mesonic weak decay lifetime
RIKEN
Test Experiment
K1.8BR
measurement with 3,4He(K-,π0)3,4ΛH reaction

Organization and Committees

Organization and Committees

J-PARC Annual Report 201960

Organization Structure
J-PARC Center Management System Chart
as of April 1, 2019

Deputy Director(Safety)

T. Ishii

Safety Division

Radiation Control Sention
Y. Nakane - M. Numajiri, K. Seki

Y. Miyamoto - K. Bessho, Y. Nakane

Safety Promotion Sention
Y. Kasugai - T. Itoh

H. Oguri

K. Yamamoto

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

N. Hayashi
M. Yoshii
T. Toyama
F. Naito

N. Saito

Director

K. Haga - K. Sakai

Deputy Director(JAEA)

M. Futakawa

K. Nakajima - S. Itoh, Y. Kawakita

Materials & Life Science Division
T. Kanaya - K. Soyama, K. Aizawa
T. Otomo, Y. Miyake

K. Sakasai
R. Kadono - N. Kawamura
K. Aizawa - T. Oku

Deputy Director(KEK)

T. Koseki

Director’s Oﬃce
Advisor (J-PARC) : S. Nagamiya
Advisor (J-PARC) : Y. Ikeda
Advisor (J-PARC) : Y. Fujii
Advisor (J-PARC) : M. Takasaki
Advisor (J-PARC) : T. Ohska

T. Nakadaira

T. Kobayashi - T. Komatsubara, Y. Fujii

NuclearM. Futakawa - F. Maekawa

S. Sawada

T. Sasa
S. Meigo

Y. Makita - K. Sasaki

K. Gorai - J. Suzuki

H. Takada - M. Nomura

M. AbeY. Yamazaki - Y. Miyamoto
H. Koda - K. Suzuki, S. Koizumi
Y. Fukuda - H. Koda

S. Waku
Users Oﬃce

K. Maeda

J-PARC Annual Report 2019

Organization and Committees

61

Members of the Committees Organized for J-PARC(as of March, 2020)

1) Steering Committee
Kenji Sudo

Japan Atomic Energy Agency (JAEA), Japan

Masayasu Takeda

Japan Atomic Energy Agency (JAEA), Japan

Junji Haba

High Energy Accelerator Research Organization (KEK), Japan

Toshiyuki Momma

Japan Atomic Energy Agency (JAEA), Japan

Yukitoshi Miura

Japan Atomic Energy Agency (JAEA), Japan

Naohito Saito

J-PARC Center, Japan

Hiroyuki Oigawa

Japan Atomic Energy Agency (JAEA), Japan

Koki Uchimaru

High Energy Accelerator Research Organization (KEK), Japan

Katsuo Tokushuku

High Energy Accelerator Research Organization (KEK), Japan

Nobuhiro Kosugi

High Energy Accelerator Research Organization (KEK), Japan

Seiya Yamaguchi

High Energy Accelerator Research Organization (KEK), Japan

2) International Advisory Committee
Jean-Michel Poutissou

TRIUMF, Canada

Thomas Prokscha

The Paul Scherrer Institute (PSI), Switzerland

Jun Sugiyama

Comprehensive Research Organization for Science and Society (CROSS), Japan

Jie Wei

Michigan State University, USA

Roland Garoby

European Spallation Source, Sweden

Eckhard Elsen

European Organization for Nuclear Research (CERN), Switzerland

Patricia McBride

Fermi National Accelerator Laboratory (FNAL), USA

Robert Tribble

Brookhaven National Laboratory (BNL), USA

Donald F. Geesaman

Argonne National Laboratory, USA

Paolo Giubellino

GSI Helmholzzentrum für Schwerionenforschung, Germany

Hamid Aït Abderrahim

SCK • CEN, Belgium

Akira Hasegawa

Tohoku University, Japan

Paul Langan

Oak Ridge National Laboratory (ORNL), USA

Hidetoshi Fukuyama

Tokyo University of Science, JapanDan Alan Neumann

National Institute of Standards and Technology (NIST), USA

Andrew Dawson Taylor

Science and Technology Facilities Council (STFC), UK

Helmut Schober

Institut Laue–Langevin, France3) 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

Hiroyuki Noumi

Osaka University, Japan

Organization and Committees

J-PARC Annual Report 201962

Shinya Sawada

High Energy Accelerator Research Organization (KEK), Japan

Fuminori Sakuma

RIKEN, Japan

Masaki Fujita

Tohoku University, Japan

Naoya Torikai

Mie University, Japan

Osamu Yamamuro

University of Tokyo, Japan

Yasushi Idemoto

Tokyo University of Science, Japan

Kazuhisa Kakurai

Comprehensive Research Organization for Science and Society (CROSS), Japan

Tosiji Kanaya

High Energy Accelerator Research Organization (KEK), Japan

Jun Akimitsu

Okayama University/Hiroshima University, Japan

Tadashi Adachi

Sophia University, Japan

Yasuhiro Miyake

High Energy Accelerator Research Organization (KEK), JapanJun Sugiyama

Comprehensive Research Organization for Science and Society (CROSS), Japan

Hiroyuki Kishimoto

Sumitomo Rubber Industries, Ltd.

Masaaki Hibi

Nippon Steel Corporation

Kenya Kubo

International Christian University, Japan

Hironori Kodama

Ibaraki Prefecture

Satoru Yamashita

University of Tokyo, Japan

Cheol-Ho Pyeon

Kyoto University, Japan

Yoshiyuki KajiJapan Atomic Energy Agency (JAEA), Japan

4) Accelerator Technical Advisory Committee
Wolfram Fischer

Brookhaven National Laboratory (BNL), USA

Mats Lindroos

European Spallation Source, Sweden

John Thomason

Science and Technology Facilities Council (STFC), UK

Sheng Wang

Institute of High Energy Physics (IHEP), China

Toshiyuki Shirai

National Institutes for Quantum and Radiological Science and Technology (QST),Japan

Alexander V Aleksandrov

Oak Ridge National Laboratory (ORNL), USA

Jie Wei

Michigan State Univ., 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

Michael Dayton

Oak Ridge National Laboratory (ORNL), USA

Yoshiaki Kiyanagi

Nagoya University, Japan

Christiane Alba-Simionesco

The Laboratoire Leon Brilloin (LLB), France

Jamie Schulz

Australian Nuclear Science and Technology Organization(ANSTO), Australia

Andreas Schreyer

European Spallation Source, Sweden

Sung-Min Choi

Korea Advanced Institute of Science and Technology, Korea

Yoshie Otake

RIKEN, Japan

Masaaki Sugiyama

Kyoto University, Japan

Christian Rüegg

The Paul Scherrer Institute (PSI), Switzerland

J-PARC Annual Report 2019

Organization and Committees

636) Muon Advisory Committee
Martin Månsson

KTH Royal Institute of Technology, Sweden

Thomas Prokscha

Paul Scherrer Institut (PSI), Switzerland

Andrew MacFarlane

University of British Columbia, Canada

Klaus Kirch

Paul Scherrer Institut (PSI), Switzerland

Kenya Kubo

International Chiristian University, Japan

Tadayuki Takahashi

University of Tokyo, Japan

Takashi Nakano

Osaka University, Japan

Hiroshi Amitsuka

Hokkaido University, Japan

7) Radiation Safety Committee
Yoshitomo Uwamino

RIKEN, Japan

Yoshihiro Asano

University of Hyogo, Japan

Hiroshi Watabe

Tohoku University, Japan

Takeshi Iimoto

University of Tokyo, Japan

Takeshi Murakami

National Institute of Radiological Science, Japan

Hitoshi Kobayashi

High Energy Accelerator Research Organization (KEK), Japan

Yoshihito Namito

High Energy Accelerator Research Organization (KEK), Japan

Shinichi Sasaki

High Energy Accelerator Research Organization (KEK), Japan

Hiroyuki Oigawa

Japan Atomic Energy Agency (JAEA), Japan

Michio Yoshizawa

Japan Atomic Energy Agency (JAEA), Japan

Nobuyuki Kinouchi

Japan Atomic Energy Agency (JAEA), Japan

8) Radiation Safety Review Committee
Tetsuro Ishii

Japan Atomic Energy Agency (JAEA), Japan

Yukihiro Miyamoto

Japan Atomic Energy Agency (JAEA), Japan

Masaharu Numajiri

High Energy Accelerator Researchi Organization (KEK), Japan

Hidetoshi Kikunaga

Tohoku University, Japan

Hiroshi Yashima

Kyoto Univaersity, Japan

Kanenobu Tanaka

Institute of Physical and Chemical Research (RIKEN), Japan

Nobuyuki Chiga

National Institute for Quantum and Radiological Science and Technoloty (QST), Japan

Toshiro Itoga

Japan Synchrotron Radiation Research Institute (JASRI), Japan

Yasuhiro Yamaguchi

Comprehensive Reserch Organization for Science and Society (CROSS), Japan

Akira Hirose

Japan Atomic Energy Agency (JAEA), Japan

Makoto Kobayashi

Japan Atomic Energy Agency (JAEA), Japan

Nobukazu Toge

High Energy Accelerator Researchi Organization (KEK), Japan

Kazuyoshi MasumotoHigh Energy Accelerator Researchi Organization (KEK), Japan

Kazuo Hasegawa

Japan Atomic Energy Agency (JAEA), Japan

Yoshiaki Fujii

High Energy Accelerator Researchi Organization (KEK), Japan

Takeshi Komatsubara

High Energy Accelerator Researchi Organization (KEK), Japan

Kazuhiko Soyama

Japan Atomic Energy Agency (JAEA), Japan

Organization and Committees

J-PARC Annual Report 2019649) MLF Advisory Board
Takamitsu Kohzuma

Ibaraki University, Japan

Takahisa Arima

The University of Tokyo, Japan

Taku J Sato

Tohoku University, Japan

Mitsuhiro Shibayama

The University of Tokyo, Japan

Yoji Koike

Tohoku University, Japan

Masaaki Sugiyama

Kyoto University, Japan

Yoshiharu Sakurai

Japan Synchrotron Radiation Research Institute(JASRI), Japan

Jun Takahara

Kyusyu University, Japan

Takashi Kamiyama

Hokkaido University, 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

Kazuhisa Kakurai

Comprehensive Research Organization for Science and Society (CROSS), Japan

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), Japan

10) Program Advisory Committee (PAC) for Nuclear and Particle Physics Experiments at the J-PARC 50Gev Proton
Synchrotron
Nori Aoi

Osaka University, Japan

Ryuichiro Kitano

High Energy Accelerator Research Organization (KEK), Japan

Masahiro Kuze

Tokyo Institute of Technology, Japan

Hirokazu Tamura

Tohoku University, Japan

Ichiro AdachiHigh Energy Accelerator Research Organization (KEK), Japan

Yoshitaka Itow

Nagoya University, Japan

Akira Ohnishi

Kyoto University, Japan

Deborah Harris

Fermi National Accelerator Laboratory (FNAL), USA

Steven Kettell

Brookhaven National Laboratory (BNL), USA

Josef Pochodzalla

University of Mainz, Germany

Monika Blanke

Karlsruhe Institute of Technology, Germany

Francois Le Diberder

The French National Institute of Nuclear and Particle Physics (IN2P3), France

Anthony William Thomas

University of Adelaide, Australia

Nu Xu

Lawrence Berkeley National Laboratory, USA

Rikutaro YoshidaThomas Jefferson National Accelerator Facility, USA

Kam-Biu Luk

University of California at Berkley, USA

J-PARC Annual Report 2019

Organization and Committees

6511) TEF Technical Advisory Committee
Marc Schyns

SCK • CEN, Belgium

Michael Butzek

Forschungszentrum Jülich, Germany

Michael WohlmutherPaul Scherrer Institut (PSI), Switzerland

Yoshiaki Kiyanagi

Nagoya University, Japan

Keishi Sakamoto

National Institutes for Quantum and Radiological Science and Technology (QST), Japan

Georg Müller

Karlsruhe Institute of Technology, Germany

Masatoshi Kondo

Tokyo Institute of Technology, Japan

Main Parameters

Main Parameters

J-PARC Annual Report 201968
Present main parameters of Accelerator
Linac
Accelerated Particles
Negative hydrogen
Energy400 MeVPeak Current
50 mA
0.32 ms for MLF
0.50 ms for MR-FX
0.10 ms for MR-SX

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
3 GeV
Repetition rate
25 Hz
Neutron Source
Target material
Mercury
Number of moderators
3
Moderator material
Liquid hydrogen
Moderator temperature/pressure
20 K/1.5 MPa
Number of neutron beam extraction ports
23
Muon production target
Target material
Graphite
Number of muon beam extraction ports
4
Neutron instruments *Open for user program (general use)
21
Under commissioning/construction
0
Muon Instruments *Open for user program (general use)3
Under commissioning/construction
1/0(* As of May, 2020)

Events

EventsFormation of the First Industry-Academia
Collaborative Consortium at J-PARC
An industry-academia collaborative “Functional
Polymer Consortium” has been formed by five corporate groups led by Kuraray Co. Ltd., Sumitomo BakeliteCo., Ltd., DIC Corporation, Nissan Chemical Corporation,and Mitsui Chemicals, Inc., and an academic researchteam made up of Kyushu University, Nagoya Instituteof Technology, Mie University, and KEK. A ceremony tocommemorate their cooperation was held on April 5.

J-PARC Hello Science: “From High Intensity Proton Acceleration to Train Acceleration-Wide-Ranging applications of
Broadband Cavity System”
On April 26, at a Science Café in Tokai Village, Ibaraki Prefecture, Dr. Chihiro Omori of the Accelerator Division spoke on the “broadband cavity systems” used at
J-PARC. This technology is in use not only at J-PARC, butalso at many circular accelerators at the European Organization for Nuclear Research (CERN).
Attempts are being made to expand to a broader
range of applications for consumer use, such as development of energy-saving transformers for railways.

Events

J-PARC Annual Report 201970

J-PARC PAC
Meetings of the J-PARC Program Advisory Committee (PAC) for the Nuclear and Particle Physics Experiments
were held from July 16 to 19, and also from January 16
to 18 2020. The committee provided advice on how toproceed with planning of nuclear and particle physics
research, using the main ring accelerator (MR) at J-PARC.

Debriefing on the industrial use of J-PARC
MLF
At Tokai Industry and Information Plaza “Ivil”

The J-PARC Center held a Safety Day meeting to remember the accident of radioactive
material leak at the Hadron Experimental
Facility that occurred on May 23, 2013
At the information exchange meeting on May 24,
J-PARC Center presented the Best Practice Award, Creativity Award, and Sanitation Consideration Award togroups that exhibited performance in safety initiatives
at workplaces in the previous fiscal year.

2nd MLF General Meeting held

The J-PARC Center held its fourth debriefing session
on the industrial use of MLF this year on July 18 and 19,
with many participants from companies, universities,
and research institutes.

J-PARC booth exhibited in GSA
Geo Space Adventure (GSA) is operated by some volunteers from Hida City, Gifu Prefecture, which provides
tours to Super-Kamiokande (SK). Every July. J-PARC plays
a part in the T2K international collaboration that pursues
neutrino research by shooting neutrinos towards SK.
“T2K” is an abbreviation of “Tokai to Kamiokande”. J-PARC
carried out PR activities on July 13 and 14.

The second general meeting of the MLF (Materials and Life Science Experimental Facility) was held on
July 10 at the Ibaraki Quantum Beam Research Center(IQBRC). Outside researchers, involved in the MLF, from
J-PARC, the Comprehensive Research Organization for
Science and Society (CROSS), and the Ibaraki Prefecture
Beamline (Ibaraki University) took part in it, aiming to
exchange information on their current situations anddeepen mutual understanding.

Iron balls scattering with a Gauss accelerator“Eco-Festival Hitachi 2019” in Hitachi City

Group Photo

Eco-Festival Hitachi is the largest environmental
event in Ibaraki Prefecture. At present, research on neutron applications is pursued in J-PARC’s MLF, and companies are working to develop high-performance tires
and storage batteries, which are eco-friendly. On July
20, J-PARC exhibited commercialized eco-tires and explained their activities.

J-PARC Annual Report 2019

Events71

J-PARC Center and DOE sign a cooperative agreement

J-PARC Hello Science: “Identifying Energy
Related Materials with Muon Particles”

The J-PARC Center has concluded a new cooperative
agreement with the US Department of Energy (DOE) forthe purpose of boosting collaboration in the high-power
spallation neutron source research and related fields.
On August 7, J-PARC Center’s Director Naohito Saito and
DOE’s Office of Science Director Chrisotpher Fall signed
the agreement.

Hello Science on September 20 featured a talk on
research into energy-related materials using muons, byinviting Dr. Jun Sugiyama, Neutron Science and Technology Center of the Comprehensive Research Organization for Science and Society (CROSS).

Signing ceremony for cooperative agreement with DOE

J-PARC Open House 2019

J-PARC 10th Anniversary Ceremony, JPARC Symposium 2019
The “10th Anniversary Ceremony, J-PARC Symposium 2019” was held at the Tsukuba International Congress Center to commemorate 10 years of operations at
the entire J-PARC facility.
On the first day, the public lecture on the topic of“Searching for the origins of the Universe, Matter andLife” drew around 330 participants. A panel discussion
titled “Role of Science in Societies, Role of Japan in theWorld” took place on the second day. This was followedby the anniversary ceremony to which approximately
600 attendees from Japan and overseas were invited. A
commemorative lecture was given by Professor Takaaki
Kajita, laureate of the 2015 Nobel Prize in Physics.
The following day, some researchers toured J-PARC.

J-PARC Open House was held on August 25. Morethan 1,500 visitors attended the event. They had thechance to tour the accelerator, hadron, neutrino, andother facilities opened for the event. Families had fun
with many workshops such as light kaleidoscopes,
spinning tops, color-changing bead straps, super balls,
slime and so on.

Tsukuba International Congress Center

Visitors saw “iBIX (The IBARAKI biological crystal diffractometer)
up close.

Symposium participantsEvents

J-PARC Annual Report 201972

Koichiro Nishikawa Memorial Symposium
Former J-PARC Center deputy director and KEK
professor emeritus Koichiro Nishikawa passed away
in November 2018. The “Koichiro Nishikawa Memorial
Symposium” was held at the KEK Tsukuba Campus Kobayashi Hall on September 27 to commemorate his accomplishments. He made outstanding contributions to
the research at J-PARC with his strong leadership skills,
including pioneering research into neutrino physics as
the spokesperson for the “T2K” experiment.

shapes until their motors spun well.

19th Collaboration Meeting for the Muon
g-2/EDM Experiment Held
A collaboration meeting was held from December 2
to 5 for the experiment (E34) on the muon’s anomalous
magnetic moment (g-2) and electric dipole moment(EDM). The Muon g-2/EDM Experiment is an international collaborative research project. The meeting hosted about 100 participants from seven countries.

J-PARC Hello Science: “Creating High-Intensity Beams” – A story of Electricity andMagnets
Dr. Tomohiro Takayanagi of the Accelerator Division is engaged in the development of the bump electromagnets installed in the beam injection section of
J-PARC’s second-stage circular accelerator, a 3 GeV synchrotron. At the Hello Science event on November 29,
he explained that J-PARC employs a world-class highintensity proton beam to produce secondary particles
used in various experiments.

Meeting of the T2K Collaboration Held
From November 18 to 22, a meeting of the T2K
collaboration was held at the Ibaraki quantum BeamResearch Center (IQBRC). The beam for the T2K experiment had been shut down for about a year and a half,
and the data acquisition was resumed on November 5.
The meeting began with reports on the operation
situation of each detector. Furthermore, there was a report on a plan by incorporating gadolinium (Gd) into
the Super-Kamiokande (SK) neutrino detectors in Kamioka-cho, Gifu Prefecture.

th

19 Youngsters’ Science Festival, Hitachi Event- “Are Magnets and Electricity
Friends?!-Single-Pole Motor Project andExperiment”
The Youngsters’ Science Festival is sponsored by
the Japan Science Foundation and is held in regions
throughout Japan. The aim is to show children the wonders of science.
On December 1, the J-PARC Center presented anexperiment with a single-pole motor, in which a copper
wire spins around a dry-cell battery placed on top of amagnet. Children were trying out various copper wireGroup Phoro

7th Koshien Science Championship for
Juniors-Gauss Accelerator demonstration
On December 8, in the Koshien Science Championship for junior high students, teams of six students from47 prefectures of Japan competed in problem solving
ability.
At the exhibition session, J-PARC performed a
Gauss accelerator experiments and many students enjoyed observing the speed of a steel ball collision withneodymium magnets.

Collaboration Meeting between SNS and
J-PARC on Nuclear Spallation Neutron
Sources Held
From December 10 to 13, a collaboration meeting was held between researchers from the Spallation
Neutron Source (SNS) of Oak Ridge National Laboratory(OENL) in the U.S. and the Materials and Life Science Experimental Facility (MLF) of J-PARC.
Both use mercury as a target material and are facing similar problems with system equipment. Therefore, related information was exchanged between thetwo organizations.

J-PARC Annual Report 2019

Events73

Fiscal 2019 J-PARC Center Safety Audit
Conducted
On December 16, the J-PARC Center Safety Audit
for fiscal year 2019 was conducted by external audit
committee members. After that, the J-PARC Deputy
Director Tetsuro Ishii led a site inspection of the work
implementation situation at the Hadron Experimental
Facility.

tum Beam Research Center (IQBRC). The main themes
this time were “Interlocks at Accelerator Facilities” and“Ensuring Safety in Machine Work”.

J-PARC Advisory Committee Held
From February 6 to 26, the J-PARC Center held advisory committee meetings in four areas: Transmutation
Experimental Facility Technology (T-TAC), Neutron Experimental Facility (NAC), Accelerator Technology (ATAC), and Muon Experimental Facility (MAC). Experts
from all over the world gathered and gave advice andrecommendations regarding the status of J-PARC’s accelerators and experimental facilities, research progress, and the future plans.

J-PARC Science Experiment Classes
Site inspection at the Hadron Experimental Facility

J-PARC Hello Science: “Investigating theOrigin of Matter in the Universe: with
Mysterious Neutrino Particles”

On February 13, students constructed pendulum
bell projects in the science club at Shirakata Elementary
School in Tokai Village. This time the theme was static
electricity. The children worked hard by rubbing vinyl
tape with tissue paper and cheered when their bells
made a sound.

We invited Professor Satoshi Koizumi (Graduate
School of Science and Engineering, Ibaraki University)
as an instructor on December 20. Dr. Koizumi spoke on
the results of research using the neutrons of the MLF toobserve the function of shampoo bubbles.
He concluded the lecture by pointing out that a recent experiment was carried out jointly with Nara Women’s University and other institutions, using the IBARAKI
Materials Design Diffractometer (iMATERIA).
Pendulum bell generating static electricity using a PVC

7th Accelerator Facility Safety Symposium Held
From January 23 to 24 2020, the 7th Accelerator
Facility Safety Symposium was held at the Ibaraki quan-Participants photoSpecial video class “Introduction to the JPARC Accelerator – “Let’s Learn about Accelerators using a Gauss Accelerator!”
In response to the spread of the novel coronavirus
infections, school closures happened all over Japan.
The Japan Association of Communication for Scienceand Technology (JACST), formed by public relations officials of universities and research institutions nationwide, has established a website for elementary, juniorhigh, and high school students who were spending a
lot of time at home.

Events

J-PARC Annual Report 201974
Dr. Tatsunobu Shibata (KEK Associate Professor)
produced an exclusive lesson video to explain accelerators in an easy-to-understand manner. It was uploadedon the J-PARC website on March 19.

Visitors
Chen Yanwei, Director of China Spallation Neutron Source(CSNS), Institute of High Energy Physics (April 24)
Brent K. Park, Deputy Administrator for Defense Nuclear
Nonproliferation, Department of Energy (DOE) (August 28)
Ayano Kunimitsu, member of the Diet (November 11)
Laura Thorborg, Minister of Foreign Affairs of Denmark(December 10)

Dr. Tatsunobu Shibata explaining J-PARC accelerators in the
video

Jiang Xingdong, Vice President of China Institute of Atomic
Energy (CIAE) (December 11)
Iulia Georgescu, chief editor of Nature Reviews Physics(January 23 2020)
Sanjay Kumar Verma, Indian Ambassador (February 5 2020)

There were 2,767 visitors to J-PARC for the period from April 2019 to the end of March2020.
ln-house 2%

Public Officers 4%
Junior-high/High school
students, teachers
13%

VIP, lawmakers 1%

Foreigners
16%

University
students,
experts
22%

Business
15%

Local
residents
27%

Publications

Publications

J-PARC Annual Report 201976

Publications in Periodical Journals
A-001
K. Mukai, et al.
Experimental Visualization of Interstitialcy
Diffusion of Li Ion in β-Li2TiO3ACS Appl. Energy Mater., 2, 5481-5489
A-002
S. Goto, et al.
Positive Weiss Temperature in Layered
Antiferromagnetic FeNiN for HighPerformance Permanent Magnets
ACS Appl. Nano Mater., 2, 6909-6917
A-003
M. Inutsuka, et al.
Adhesion Control of Elastomer Sheet on
the Basis of Interfacial Segregation ofHyperbranched Polymer
ACS Macro Letters, 8, 267-271
A-004
Y. Sawama, et al.
Birch-Type Reduction of Arenes in
2-Propanol Catalyzed by Zero-Valent Iron
and Platinum on Carbon
ACS Omega, 4, 11522-11531
A-005
Y. Shibuya, et al.
Continuous mesoporous aluminum oxide
film with perpendicularly oriented mesopore
channels
ACS Omega, 4, 17890-17893
A-006
K. Yamashita, et al.
Crystal structure of a high-pressure phaseof magnesium chloride hexa-hydrate
determined by in-situ X-ray and neutron
diffraction methods
Acta Crystallogr. C Struct. Chem., C75, 16051612
A-007
A. Ahadi, et al.
Reversible elastocaloric effect at ultra-low
temperatures in nanocrystalline shapememory alloys
Acta Mater., 165, 109-117
A-008
A. Ahadi, et al.
Neutron diffraction study of temperaturedependent elasticity of B19´ NiTi---Elinvar
effect and elastic softening
Acta Mater., 173, 281-291
A-009
H. Fukui, et al.
Structure change of monoclinic ZrO2
baddeleyite involving softenings of bulk
modulus and atom vibrations
Acta. Crystallogr. B Struct. Sci., 75, 742-749

A-010
Y. Zhong, et al.
Determination of fine magnetic structureof magnetic multilayer with quasi
antiferromagnetic layer by using polarized
neutron reflectivity analysis
AIP Advances, 10, 015323
A-011
H. Kawasoko, et al.
Investigation of magnetism and magnetic
structure of anti-ThCr2Si2-type Tb2O2Bi
by magnetization and neutron diffraction
measurements
AIP Advances, 9, 115301
A-012
K. Osamura, et al.
Inverted-parabolic and weak strain
dependencies on the critical current inpractical< 110> and< 100> oriented REBCO
tapes
AIP Advances, 9, 75216
A-013
Y. Wang, et al.
Pressure-Induced Diels-Alder Reactions in
C6H6-C6F6 Cocrystal towards Graphane
Structure
Angew. Chem. Int. Ed., 58, 1468-1473
A-014
P. Miao, et al.
Revealing magnetic ground state ofa layered cathode material by muon
spin relaxation and neutron scatteringexperiments
Appl. Phys. Lett., 114, 203901
A-015
K.M. Kojima, et al.
Electronic structure of interstitial hydrogenin In-Ga-Zn-O semiconductor simulated bymuon
Appl. Phys. Lett., 115, 122104
A-016
N. Kimura, et.al.
Combined effect of bending and flattening
on heat transfer performance of cryogenic
sintered-wick heat pipe
Appl. Therm. Eng. 148 (2019), 878
A-017
C. Simpson, et al.
Sensitivity of Super-Kamiokande withGadolinium to Low Energy Antineutrinos
from Pre-supernova Emission
Astrophys. J. 885 (2019), 133
A-018
T. Sugiura, et al.
Biophysical parameters of the Sec14
phospholipid exchange cycle

Biophys. J., 116, 92-103
A-019
Y. Kameda, et al.
Origin of the Difference in Ion-Water
Distances Determined by X-ray and Neutron
Diffraction Measurements for Aqueous NaCland KCl Solutions
Bull. Chem. Soc. Jpn., 92, 754-767
A-020
T. Matsunaga, et al.
Comprehensive elucidation of crystal
structures of lithium-intercalated graphite
Carbon, 142, 513-517
A-021
N. Kitamura, et al.
The atomic structure of a MgCo2O4
nanoparticle for a positive electrode of a Mg
rechargeable battery
Chem. Commun., 55, 2517-2520
A-022
T. Sugahara, et al.
Small-angle neutron scattering study of
micelle structure and hydration behavior ofoleic acid-based gemini surfactant
Chem. Lett., 48, 1050-1053
A-023
M. Harada, et al.
Compositional Segregation in Cross Sectionof Wet Nafion Thin Film on Platinum Surface
Chem. Lett., 48, 51-54
A-024
M. Nakano
Evaluation of interbilayer and transbilayertransfer dynamics of phospholipids
using time-resolved small-angle neutron
scattering
Chem. Pharm. Bull, 67, 316-320
A-025
T. Sato, et al.
Hydrogen‐Release Reaction of a Complex
Transition Metal Hydride with Covalently
Bound Hydrogen and Hydride Ions
Chem. Phys. Chem., 20, 1392-1397
A-026
S. Benz, et al.
Ammonothermal Synthesis, X-Ray andTime-of-Flight Neutron Crystal-Structure
Determination, and Vibrational Properties ofBarium Guanidinate, Ba(CN3H4)2
Chemistryopen, 8,, 327-332
A-027
N.V. Mdlovu, et al.
Iron oxide-pluronic F127 polymer
nanocomposites as carriers for doxorubicin
drug delivery system

J-PARC Annual Report 2019

Publications

77

Colloids Surf. A Physicochem. Eng. Asp., 562,
361-369
A-028
K. Suzuki, ,et al.
Quench protection for high Tc
superconducting rotating gantry model
magnet with I-V characteristics measured in
the temperature range of 40-83 K
Cryogenics, 100, p.28
A-029
R. Maruyama, et al.
Coherent magnetization rotation of alayered system observed by polarized
neutron scattering under grazing incidencegeometry
Crystals, 9, 383
A-030
TN Lam, et al.
Comparing Cyclic Tension-Compression
Effects on CoCrFeMnNi High-Entropy Alloyand Ni-Based Superalloy
Crystals, 9, 420
A-031
T. Matsukawa, et al.
Average and local structures of κ-phase
CeZrO4 crystals by neutron powder
diffraction
CrystEngComm, 21, 6335-6339
A-032
M. Sugishima, et al.
Bilin-metabolizing enzymes: site-specificreductions catalyzed by two different typeof enzymes
Curr. Opin. Struct. Biol., 59, 73-80
A-033
T. Nakane, et al.
Magnetic, thermal, and neutron diffraction
studies of a coordination polymer:bis(glycolato)cobalt(II)Dalton Transactions, 48, 333
A-034
Y. Idemoto, et al.
Synthesis, crystal structure and electrodeproperties of spinel-type MgCo2−xMnxO4
Electrochemistry, 87, 220-228
A-035
T. Kawamoto, et al.
Sublayered Structures of Hydrated Nafion®
Thin Film Formed by Casting on Pt Substrate
Analyzed by X-ray Absorption Spectroscopy
under Ambient Conditions and Neutron
Reflectometry at Temperature of 80°C and
Relative Humidity of 30–80%
Electrochemistry, 87, 270-275

A-036
T. Yamaguchi, et al.
Ion hydration and association in an aqueous
calcium chloride solution in the GPa range
Eur. J. Inorg. Chem., 2019, 1170-1177
A-037
N. Abgrall, et al.
Measurements of π±, K± and proton double
differential yields from the surface of the T2K
replica target for incoming 31 GeV/c protons
with the NA61/SHINE spectrometer at the
CERN SPS
Eur. Phys. J. C ,79 (2019), 100
A-038
D. Adams, et al.
First particle-by-particle measurement ofemittance in the Muon Ionization CoolingExperimentEur. Phys. J. C, 79 (2019), 257
A-039
K. Furukawa, et al.
HE-LHC: The High-Energy Large Hadron
ColliderEur. Phys. J. Spec. Top., 228, 1109
A-040
K. Máthis, et al.
In-situ investigation of the microstructure
evolution in long-period-stacking-ordered(LPSO) magnesium alloys as a function of thetemperature
Front. Mater., 6, 270
A-041
T. Hattori, et al.
Development of a technique for highpressure neutron diffraction at 40 GPa with a
Paris-Edinburgh press
High Press. Res., 39, 417-425
A-042
K. Suzuki, et al.
Test Result of the HL-LHC Beam Separation
Dipole Model Magnet With the New Iron
Cross Section
IEEE Trans. Appl. Supercond., 29 (2019),
4000905
A-043
M. Sugano, et al.
Development of 2-m Model Magnet of theBeam Separation Dipole With New Iron
Cross Section for the High-Luminosity LHC
UpgradeIEEE Trans. Appl. Supercond., 29 (2019),
4003607
A-044
S. Takayama, et al.
Development of an HTS Accelerator Magnet
With REBCO Coils for Tests at HIMAC Beam

Line
IEEE Trans. Appl. Supercond., 29 (2019),
4004205
A-045
N. Amemiya, et al.
Test of Cryocooler-Cooled RE-123 Magnet on
HIMAC Beam Line in S-Innovation Program
IEEE Trans. Appl. Supercond., 29 (2019),
4600305
A-046
T. Yagai, et al.
Stability Analysis of MgB2 Coils for SMES
Application Consisting of Large-Scale
Rutherford Cables
IEEE Trans. Appl. Supercond., 29 (2019),
4602705
A-047
M. Dhakarwal ,et al.
Electromechanical Characterization of the
MgB2 Wire for Transmission Line Magnet
SystemIEEE Trans. Appl. Supercond., 29 (2019),
4802404
A-048
M. Jimbo, et al.
Investigation on IC Degradation of MgB2
Rutherford Cables by Deformation During
Cabling Process
IEEE Trans. Appl. Supercond., 29 (2019),
8003305
A-049
H. Yamaguchi, et al.
Development of a CW-NMR Probe for Precise
Measurement of Absolute Magnetic Field
IEEE Trans. Appl. Supercond., 29 (2019),
9000904
A-050
D. Schoerling, et al.
The 16 T Dipole Development Program for
FCC and HE-LHCIEEE Trans. Appl. Supercond., 29, 4003109
A-051
A. Ballarino, et al.
The CERN FCC Conductor Development
Program: A Worldwide Effort for the Future
Generation of High-Field Magnets
IEEE Trans. Appl. Supercond., 29, 6001709
A-052
C. Ohmori, M. Paoluzzi
Development of Radiation-Hard Solid-State
Ampli ers for kilo-Gray Environments using
COTS components
IEEE Trans. Nucl. Sci, 66, No. 10, October 2019,p. 2188-2195, DOI: 10.1109/tns. 2019.2937603

Publications

J-PARC Annual Report 2019

78
A-053
M. Ichikawa, et al.
Trigger Merging Module for the J-PARC E16
ExperimentIEEE Trans. Nucl. Sci., 66 (2019), 2022
A-054
F. Tamura, et al.
Development of next-generation LLRF
control system for J-PARC rapid cycling
synchrotronIEEE Trans. Nucl. Sci., 66(7), p.1242 - 1248,
2019/07
A-055
T. Shimogawa, et al.
A Control System of New magnet Power
Converter for J-PARC Main Ring Upgrade
IEEE Trans. Nucl. Sci., 66, 1236
A-056
R. Kataoka, et al.
Facile Synthesis of LiH-Stabilized FaceCentered-Cubic YH3 High-Pressure Phase by
Ball Milling Process
Inorg. Chem. 58, 13102-13107
A-057
J. Hu, et al.
A case of multifunctional intermetallic
compounds: negative thermal expansion
coupling with magnetocaloric effect in(Gd,Ho)(Co,Fe)2Inorg. Chem. Front., 6, 3146-3151

A-062
T. Yamada, et al.
Single-crystal time-of-flight neutron Lauemethods: application to manganese catalase
from Thermus thermophilus HB27
J. Appl. Cryst., 52, 972-983
A-063
T. Kumada, et al.
Development of spin-contrast-variation
neutron reflectometry for the structural
analysis of multilayer films
J. Appl. Crystallogr., 52, 1054-1060
A-064
T. Fukuda, et al.
Neutron diffraction study on martensitic
transformation under compressive stress inan ordered Fe3Pt
J. Appl. Phys., 126 (2019), 25107
A-065
T. Komori, et al.
Magnetic reversal in rare-earth free Mn4−
xNixN epitaxial films below and above
Ni composition needed for magnetic
compensation around room temperature
J. Appl. Phys., 127, 043903
A-066
M. Ooe, et al.
Direct observation of mobility of thinpolymer layers via asymmetric interdiffusion
using neutron reflectivity measurements
J. Chem. Phys., 151, 244905

A-058
Y. Yasui, et al.
Discovery of a Rare-Earth-Free Oxide-Ion
Conductor Ca3Ga4O9 by Screening throughBond Valence-Based Energy Calculations,
Synthesis, and Characterization of Structuraland Transport Properties
Inorg. Chem., 58, 9460-9468

A-067
H. Iwase, et al.
Rheo-SANS study on relationship between
micellar structures and rheological behaviorof cationic gemini surfactants in solution
J. Colloid Interface Sci., 538, 357-366

A-059
H. Mizoguchi, et al.
Zeolitic Intermetallics: LnNiSi (Ln = La–Nd)
J. Am. Chem. Soc., 141, 3376-3379

A-068
H. Frielinghaus, et al.
The locally columnar model for clay/
polymer systems: Connections to scatteringexperiments
J. Colloid Interface Sci., 544, 172-177

A-060
Y. Yasuda, et al.
Molecular Dynamics of Polyrotaxane in
Solution Investigated by Quasi-Elastic
Neutron Scattering and Molecular Dynamics
Simulation: Sliding Motion of Rings on
PolymerJ. Am. Chem. Soc., 141, 9655-9663
A-061
S. Koizumi, et al.
Microstructure and water distribution in
catalysts for polymer electrolyte fuel cells,
elucidated by contrast variation small-angle
neutron scattering
J. Appl. Cryst., 52, 791-799

A-069
T. Hasegawa, et al.
MeV-scale reheating temperature andthermalization of oscillating neutrinos byradiative and hadronic decays of massive
particles
J. Cosmol. Astropart. Phys., 12 (2019), 12
A-070
Y. Hino, et al.
Aging study of Gd concentration in LABbased Gd loaded liquid scintillator exposed
to passivated stainless steel
J. Instrum., 14 (2019), P09007
A-071
M. Nakazawa, et al.

Prototype analog front-end for negative-ion
gas and dual-phase liquid-Ar TPCs
J. Instrum., 14 (2019), T01008
A-072
Y. Hino, et al.
Stainless steel tank production and tests for
the JSNS2 neutrino detector
J. Instrum., 14 (2019), T09001
A-073
J. Park, et al.
Production and optical properties of liquid
scintillator for the JSNS2 experimentJ. Instrum., 14 (2019), T09010
A-074
Y. Kitanaka, et al.
Composition-driven structural variationin ferrielectric phase of (Bi1/2Na1/2)TiO3Ba(Mg1/3Nb2/3)O3
J. J. Appl. Phys., 58, SLLA04
A-075
K. Shimizu, et al.
Neutron Imaging Analysis of Hydrogen
Content in Pure Palladium and AluminumAlloysJ. Japan Inst. Metals, 83, 434-440
A-076
T. Matsushita, et al.
Generation of $^4$He$_2^*$ Clusters via
Neutron-$^3$He Absorption Reaction
towards Visualization of Full Velocity Field in
Quantum Turbulence
J. Low Temp. Phys., 196, 275-282
A-077
K. Asami, et al.
Crystal structure analysis and evidence of
mixed anion coordination at the Ce3+ sitein Y3Al2(Al,Si)3(O,N)12 oxynitride garnet
phosphorJ. Mater. Chem. C, 7, 1330-1336
A-078
S. Fujiwara, et al.
Dynamic properties of human-synuclein
related to propensity to amyloid fibril
formation
J. Mol. Biol., 431, 3229-3245
A-079
A. Hyde, et al.
Surface Properties of the Ethanol/Water
Mixture: Thickness and Composition
J. Mol. Liq., 290, 111005
A-080
H. Abe, et al.
Static and dynamic properties of nanoconfined water in room-temperature ionicliquids
J. Mol. Liq., 290, 111216

J-PARC Annual Report 2019

Publications

79
A-081
K. Yoshida, et al.
The effect of alkyl ammonium ionic liquids
on thermal denaturation aggregation of
β-lactoglobulin
J. Mol. Liq., 293, 111477
A-082
H. Iwamoto, S. Meigo
Unified description of the fission probability
for highly excited nuclei
J. Nucl. Sci. and Technol, 56 160-171 (2019)
A-083
H. Ishikawa, et al.
Neutron spectrum change with thermal
moderator temperature in a compact
electron accelerator-driven neutron source
and its effects on spectroscopic neutrontransmission imaging
J. Nucl. Sci. Tech., 56, 221
A-084
A. Kimura, et al.
Measurements of the 243Am neutron
capture and total cross sections with ANNRI
at J-PARC
J. Nucl. Sci. Technol., 56, 479-492
A-085
M. Hirai, et al.
Observation of protein and lipid membrane
structures in a model mimicking themolecular-crowding environment of cells
using neutron scattering and cell debris
J. Phys. Chem. B, 123, 3189-3198
A-086
Y. Kameda, et al.
Solvation Structure of Li+ in Methanol and2-Propanol Solutions Studied by ATR-IR and
Neutron Diffraction with 6Li/7Li Isotopic
Substitution Methods
J. Phys. Chem. B, 123, 4967-4975
A-087
N. Nishi, et al.
Potential-Dependent Structure of the Ionic
Layer at the Electrode Interface of an Ionic
Liquid Probed Using Neutron Reflectometry
J. Phys. Chem. C, 123, 9223-9230

Segment Motions of Proteins under Nonnative States Evaluated Using Quasielastic
Neutron Scatering
J. Phys. Chem. Lett., 10, 7505-7509

Unique Helical Magnetic Order andField-Induced Phase in Trillium Lattice
Antiferromagnet EuPtSi
J. Phys. Soc.f Jap., 88, 013702

A-091
R. Y. Umetsu, et al.
Atomic ordering, magnetic properties, andelectronic structure of Mn2CoGa Heusler
alloy
J. Phys. Condens. Matter, 31, 65801

A-101
Y. Idemoto, et al.
Average, electronic, and local structures of
LiMn2-xAlxO4 in charge-discharge processby neutron and synchrotron X-ray
J. Power Sources, 410-411, 38-44

A-092
K. Abe, et al.
Search for neutral-current induced single
photon production at the ND280 neardetector in T2K
J. Phys. G, 46 (2019), 08LT01

A-102
N. Kitamura, et al.
Study of atomic ordering across the layer
in lithium-rich layered positive electrodematerial towards preparation processoptimization
J. Power Sources, 437, 226905

A-093
T. Kim, et al.
Hybridization and Decay of Magnetic
Excitations in Two-Dimensional Triangular
Lattice Antiferromagnets
J. Phys. Soc. Japan, 88, 081003
A-094
R. Kajimoto, et al.
Crystal Structures of Highly Hole-Doped
Layered Perovskite Nickelate Pr2−xSrxNiO4Studied by Neutron Diffraction
J. Phys. Soc. Japan, 88, 114602
A-095
S. Asano, et al.
Oxidation Annealing Effects on the SpinGlass-Like Magnetism and Appearanceof Superconductivity in T*-typeLa1−x/2Eu1−x/2SrxCuO4 (0.14 ≤ x ≤ 0.28)
J. Phys. Soc. Japan, 88, 84709
A-096
K. Iwasa
Neutron Scattering Studies on 4f2-Electron
Multipoles in Pr-based Systems
J. Phys. Soc. Jpn. , 88, 081005
A-097
K. Shiomi, et al.
Approach to New Physics through Kaon Rare
Decay Study
J. Phys. Soc. Jpn., 74 (2019), 830

A-088
H. Akiba, et al.
Structural and Thermodynamic Studies ofHydrogen Absorption/Desorption Processes
on PdPt Nanoparticles
J. Phys. Chem. C, 123, 9471-9478

A-098
S. Itoh, et al.
Neutron Brillouin Scattering and Low-Q
Dynamics in Condensed Matter
J. Phys. Soc. Jpn., 88, 081004

A-089
M. Russina, et al.
Nanoscale Dynamics and Transport in Highly
Ordered Low-Dimensional Water
J. Phys. Chem. Lett., 10, 6339-6344

A-099
T. Nakajima, et al.
Observation of magnetic skyrmions byneutron scattering
J. Phys. Soc. Jpn., 88, 081006

A-090
S. Fujiwara, et al.

A-100
K. Kaneko, et al.

A-103
K. Ninomiya, et al.
Negative muon capture ratios for nitrogenoxide molecules
J. Radioanal. Nucl. Chem., 319, 767
A-104
G. Yoshida, et al.
Initial quantum levels of captured muons in
CO, CO2, and COS
J. Radioanal. Nucl. Chem., 320, 283
A-105
K. Ninomiya, et al.
Development of non-destructive isotopic
analysis methods using muon beams andtheir application to the analysis of lead
J. Radioanal. Nucl. Chem., 320, 801
A-106
W. Huang, et al.
Superionic lithium conductor with a cubic
argyrodite-type structure in the Li–Al–Si–S
system
J. Solid State Chem., 270, 487-492
A-107
T. Kawamoto, et al.
In-Plane Distribution of Water inside Nafion
Thin Film Analyzed by Neutron Reflectivity at
Temperature of 80C and Relative Humidity of
30-80% Based on 4-Layered Structural Model
Jpn. J. Appl. Phys., 58, SIID01
A-108
H. Hotchi, et al.
Beam dynamics study for beam loss
mitigation in the J-PARC RCS
Kasokuki, 16, no. 2, p. 109 (2019)
A-109
H. Hotchi, et al.
Beam dynamics study for beam loss
mitigation in the J-PARC RCS
Kasokuki, 16 no. 2, p.109 - 118, 2019/07

Publications

J-PARC Annual Report 2019

80
A-110
Y. Onuki, et al.
Anomalous Twinning as the Macroscopic
Deformation Mechanism for AZ31
Magnesium Alloy
Key Eng. Mater., 810, 95-100
A-111
T. Miyazaki, et al.
Elucidation of a Heterogeneous Layered
Structure in the Thickness Direction ofPoly(vinyl alcohol) Films with Solvent VaporInduced Swelling
Langmuir, 35, 11099-11107
A-112
K. Imwiset, et al.
Novel flexible supramolecular assembly ofdioleyldimethylammonium ion in a twodimensional nanospace studied by neutron
scattering
Langmuir, 35, 13977-13982
A-113
T. Sakamaki, et al.
Ion-Specific Hydration States of Zwitterionic
Poly (sulfobetaine methacrylate) Brushes in
Aqueous Solutions
Langmuir, 35, 1583-1589
A-114
S. Lee, et al.
Instability of Polystyrene Film and Thermal
Behaviors Mediated by Unfavorable Silicon
Oxide Inter-layer
Macromolecules, 52, 7524-7530
A-115
N. Itagaki, et al.
A Surface Effect on Frictional Properties forThin Hydrogel Films of Poly(vinyl ether)
Macromolecules, 52, 9632
A-116
Y. Tomota, et al.
Dislocation densities and intergranular
stresses of plastically deformed austenitic
steelsMater. Sci. Eng. A, 743, 32-39
A-117
H. Chae, et al.
Plastic anisotropy and deformationinduced phase transformation of additive
manufactured stainless steel
Mater. Sci. Eng. A, 762, 138065
A-118
Y. Koyanagi, et al.
Investigation of strengthening mechanism
in Ni–38Cr-3.8 Al alloy with fine lamellar
structure by in situ neutron diffraction
analysis
Mater. Sci. Eng. A, 773, 13822
A-119
T. Wan, et al.

Numerical study on the potential of
cavitation damage in a lead-bismuth
eutectic spallation target
Materials, 12(4), p.681_1 - 681_15, 2019/02
A-120
M. M. Schiavone, et al.
The multilevel structure of sulfonatedsyndiotactic-polystyrene model
polyelectrolyte membranes resolved byextended Q-range contrast variation SANS
Membranes, 9, 136

A-129
Y. Fujishiro, et al.
Topological transitions among skyrmionand hedgehog-lattice states in cubic chiralmagnetsNat. Commun., 1059
A-130
C. Aidala, et al.
Creation of quark-gluon plasma dropletswith three distinct geometries
Nat. Phys., 15 (2019), 214

A-121
T. MibePhysics of muonium and related topics
Meson, 49 (2019), 37

A-131
B. Li, et al.
Colossal barocaloric effects in plastic crystals
Nature, 567, 506-510

A-122
Y. Onuki, et al.
In Situ Observation of Bainite Transformationand Simultaneous Carbon Enrichment
in Austenite in Low-Alloyed TRIP SteelUsing Time-of-Flight Neutron Diffraction
Techniques
Metall. Mat. Trans. A, 50, 4977-4986

A-132
Y. Onodera, et al.
Origin of the mixed alkali effect in silicate
glass
NPG Asia Mater., 11, 75

A-123
K. Kiriyama, et al.
Development of a biaxial tensile testingmachine for pulsed neutron experiments
MethodsX, 6, 2166-2175
A-124
K. Nagura, et al.
Size-tunable MRI-visible nitroxide-basedmagnetic mixed micelles: preparation,
stability, and theranostic application
Nanotechnology, 30, 224002
A-125
K. Nawa, et al.
Triplon band splitting and topologicallyprotected edge states in the dimerized
antiferromagnet
Nat. Commun., 10, 2096
A-126
K. Fukui, et al.
Characteristic fast H− ion conduction inoxygen-substituted lanthanum hydrideNat. Commun., 10, 2578(1-7)
A-127
J. Wang, et al.
Evidence for singular-phonon-induced
nematic superconductivity in a topologicalsuperconductor candidate Sr0.1Bi2Se3
Nat. Commun., 10, 2802
A-128
M. Hirschberger, et al.
Skyrmion phase and competing magnetic
orders on a breathing Kagome latticeNat. Commun., 10, 5831

A-133
M. Hagihala, et al.
Magnetic states of coupled spin tubes withfrustrated geometry in CsCrF4
npj Quantum Mater., 4, 14
A-134
S. Miyahara, et al.
The Analytical study of inventories andphysicochemical configuration of spallation
products produced in Lead-Bismuth Eutecticof Accelerator Driven System
Nucl. Eng. Des., 352, p.110192_1 - 110192_8,
2019/10A-135
M. Otani, et al.
Response of microchannel plates topositrons from muon-decays
Nucl. Inst. Meth A 943, 162475-1 –162475-4(2019)A-136
Y. Nakazawa, et al.
Beam commissioning of muon beamline
using negative hydrogen ions generated byultraviolet light
Nucl. Inst. Meth. A 937, 164-167 (2019)
A-137
M. Otani, et al.
Compact buncher cavity for muons
accelerated by a radio-frequency
quadrupole
Nucl. Inst. Meth. A 946, 162693-1 – 162693-5(2019)A-138
M. Teshigawara, et al.
Measurement of neutron scattering crosssection of nano-diamond with particle
diameter of approximately 5 nm in energy
range of 0.2 meV to 100 meV

J-PARC Annual Report 2019

Publications

81
Nucl. Instr. and Methods Phys. Res. A, 929,
113-120
A-139
C. A. Aidala, et al.
The SeaQuest spectrometer at Fermilab
Nucl. Instrum. Methods Phys. Res. A, 930(2019), 49
A-140
Y. Obara, et al.
Profile measurement of circulating electrons
in a synchrotron by inserting a carbon wire
Nucl. Instrum. Methods Phys. Res. A, 922(2019), 108
A-141
Y. Noda, et al.
Dynamic nuclear polarization apparatus
for contrast variation neutron scatteringexperiments on iMATERIA spectrometer at
J-PARC
Nucl. Instrum. Methods Phys. Res. A, 923, 127-133
A-142
K. Ueno, et al.
Design and performance evaluation of frontend electronics for COMET straw tracker
Nucl. Instrum. Methods Phys. Res. A, 936(2019), 297
A-143
Y. Nakazawa, et al.
Radiation study of FPGAs with neutron beam
for COMET Phase-I
Nucl. Instrum. Methods Phys. Res. A, 936(2019), 351
A-144
Y. Fujii, et al.
Development of the proton beam monitor
based on the thin diamond crystal for the
COMET Experiment
Nucl. Instrum. Methods Phys. Res. A, 936(2019), 669
A-145
S. Shimizu, et al.
A new experimental method to search
for T-violation using a sequential CeF3
scintillating calorimeter
Nucl. Instrum. Methods Phys. Res. A, 945(2019), 162587
A-146
A. D. Pant, et al.
Characterization and optimization ofultra slow muon beam at J-PARC/MUSE: A
simulation study
Nucl. Instrum. Methods Phys. Res. A:
Accelerators, Spectrometers, Detectors andAssociated Equipment, 929, 129-133
A-147
Z. Fang, et al.
Novel auto-startup technology for two
cavities of a medical accelerator with one RF

sourceNucl. Instrum. Methods Phys. Res. Sect. A, 922,
193
A-148
T. Oyama, et al.
Thermal neutron profile inside J-PARC main
ring tunnel
Nucl. Instrum. Methods Phys. Res. Sect. A, 937,
98

Thermal-hydraulic analysis of the LBE
spallation target head in JAEA
Nuclear Technology, 205(1-2), p.188 - 199,
2019/01
A-158
T. Hosobata, et al.
Elliptic neutron-focusing supermirror for
illuminating small samples in neutronreflectometry
Opt. Express, 27, 26807

A-149
S. Li, et al.
Iterative learning control-based
adaptive beamloading compensation
implementations in the J-PARC LINAC
Nucl. Instrum. Methods Phys. Res. Sect. A, 945,
162612

A-159
S. Kobayashi, et al.
Thermal aging effects on magnetisation
reversals in a predeformed Fe-1wt%Cu alloy
studied via first-order reversal curves
Philos. Mag. Lett., 99, 217-225

A-150
A. S. Tremsin, et al.
Non-destructive mapping of water
distribution through white-beam andenergy-resolved neutron imaging
Nucl. Instrum. Methods Phys. Res., A, 927, 174183

A-160
K. Akutsu-Suyama, et al.
Design and Characterization of a2-(2’-Hydroxyphenyl)benzimidazole-Based
Sr2+-Selective Fluorescent Probe in Organicand Micellar Solution Systems
Photochem. Photobiol. Sci., 18, 2531-2538

A-151
J. K. Ahn, et al.
XXVIIth International Conference on
Ultrarelativistic Nucleus-Nucleus Collisions(Quark Matter 2018)
Nucl. Phys. A, 982 (2019), 1038

A-161
K. L. Browning, et al.
Role of conductive binder to direct solidelectrolyte interphase formation over silicon
anodesPhys. Chem. Chem. Phys., 21, 17356

A-152
A. Adare, et al.
XXVIIth International Conference on
Ultrarelativistic Nucleus-Nucleus Collisions(Quark Matter 2018)
Nucl. Phys. A, 982 (2019), 1053

A-162
T. Takamuku, et al.
Effects of the long octyl chain on complex
formation of nickel(II) with dimethyl
sulfoxide, methanol, and acetonitrile in Ionic
liquid of [C8mim][TFSA]
Phys. Chem. Chem. Phys., 21, 3154-3163

A-153
H. Sako
Studies of extremely dense matter in heavyion collisions at J-PARC
Nucl. Phys. A, 982 (2019), 959
A-154
M. Aoki, et al.
XXVIIth International Conference on
Ultrarelativistic Nucleus-Nucleus Collisions(Quark Matter 2018)
Nucl. Phys. A, 982 (2019), 985
A-155
S. Yasui, et al.
Kondo phase diagram of quark matter
Nucl. Phys. A, 983 (2019), 90
A-156
M. G. Alexeev, et al.
Measurement of PT-weighted Sivers
asymmetries inleptoproduction of hadrons
Nucl. Phys. B, 940 (2019), 34
A-157
T. Wan, et al.

A-163
K. Akutsu-Suyama, et al.
Controlled deuterium labelling of
imidazolium ionic liquids to probe the finestructure of the electrical double layer using
neutron reflectometry
Phys. Chem. Chem. Phys.,21, 17512-17516
A-164
A. Kyono, et al.
Crystal structure change of katoite,
Ca3Al2(O4D4)3, with temperature at highpressure
Phys. Chem. Minerals, 46, 459-469
A-165
T. Ishikawa, et al.
Non-strange dibaryons studied in the γd →π0π0d reaction
Phys. Lett. B, 789 (2019), 413
A-166
S. Ajimura, et al.
"K-pp", a K-meson nuclear bound state,observed in 3He(K-, Λp)n reactions

Publications

J-PARC Annual Report 201982
Phys. Lett. B, 789 (2019), 620

Phys. Rev. B, 100, 235135

A-167
S. Ajimura, et al.
"K-pp", a K-meson nuclear bound state,observed in 3He(K-, Λp)n reactions
Phys. Lett. B, 789, p.620

A-177
A. Koda, et al.
Coupled spin-charge-phonon fluctuation in
the all-in/all-out antiferromagnet Cd2Os2O7
Phys. Rev. B, 100, 245113(1-6)

A-168
R. Akhunzyanov, et al.
Transverse extension of partons in the
proton probed in the sea-quark range bymeasuring the DVCS cross section
Phys. Lett. B, 793 (2019), 188

A-178
H. Kadowaki, et al.
Spin correlations of quantum-spin-liquidand quadrupole-ordered states of Tb2+xTi2xO7+yPhys. Rev. B, 99, 014406

A-169
A. AguilarArevalo, et al.
Search for heavy neutrinos in π → μν decay
Phys. Lett. B, 798 (2019), 134980

A-179
J. Yamaura, et al.
Quantum dynamics of hydrogen in theiron-based superconductor LaFeAsO0.9D0.1
measured with inelastic neutron
spectroscopy
Phys. Rev. B, 99, 220505®

A-170
F. Tamura, et al.
Multiharmonic vector rf voltage control for
wideband cavities driven by vacuum tube
amplifiers in a rapid cycling synchrotron
Phys. Rev. Accel. Beams (Internet), 22(9),p.092001_1 - 092001_22, 2019/09
A-171
Y. Kondo, et al.
Development of a radio frequency
quadrupole linac implemented with theequipartitioning beam dynamics scheme
Phys. Rev. Accel. Beams 22, 120101-1 – 1201018 (2019)
A-172
K. Iida, et al.
Coexisting spin resonance and long-range
magnetic order of Eu in EuRbFe4As4
Phys. Rev. B, 100, 014506
A-173
S. Klotz, et al.
High-pressure structure and electronic
properties of YbD2 to 34 GPa
Phys. Rev. B, 100, 0210101®
A-174
H. Suzuki, et al.
X-ray magnetic circular dichroism andneutron diffraction measurements ofthe magnetic moment of titanium in
Sm(Fe0.8Co0.2)11Ti
Phys. Rev. B, 100, 144443
A-175
H. Tamatsukuri, et al.
Nonlinear piezomagnetoelectric effect in
CuFeO2
Phys. Rev. B, 100, 201105
A-176
S. Ideta, et al.
Experimental investigation of the
suppressed superconducting gap anddouble-resonance mode in Ba1−xKxFe2As2

A-180
K. P. Kramer, et al.
Band structure of overdoped cuprate
superconductors: Density functional theory
matching experiments
Phys. Rev. B, 99, 224509
A-181
K. Matan, et al.
Magnetic structure and high-fieldmagnetization of the distorted kagome
lattice antiferromagnet Cs2Cu3SnF12
Phys. Rev. B., 99, 224404
A-182
O. Morimatsu, et al.
Renormalization of the unitarized WeinbergTomozawa interaction without on-shellfactorization and I = 0 KN-πΣ coupledchannels
Phys. Rev. C, 100 (2019), 25201
A-183
N. Muramatsu, et al.
Measurement of neutral pion
photoproduction off the proton withthe large acceptance electromagnetic
calorimeter BGOegg
Phys. Rev. C, 100 (2019), 55202
A-184
C. C. Haddock, et al.
Measurement of the total neutron-scatteringcross-section ratios of noble gases of natural
isotopic composition using a pulsed neutron
beam
Phys. Rev. C, 100, 64002
A-185
S. Ahmed, et al.
First ultracold neutrons produced at TRIUMF
Phys. Rev. C, 99 (2019 ),25503

A-186
J .S. Randhawa, et al.
Observation of excited states in 20Mg sheds
light on nuclear forces and shell evolution
Phys. Rev. C, 99 (2019), 21301
A-187
A. Adare, et al.
Multiparticle azimuthal correlations for
extracting event-by-event elliptic andtriangular flow in Au + Au collisions at √sNN
= 200 GeV
Phys. Rev. C, 99 (2019), 24903
A-188
C. Aidala, et al.
Nonperturbative-transverse-momentum
broadening in dihadron angular correlationsin √sNN = 200 GeV proton-nucleus collisions
Phys. Rev. C, 99 (2019), 44912
A-189
K. Abe, et al.
Search for heavy neutrinos with the T2K neardetector ND280
Phys. Rev. D, 100 (2019), 52006
A-190
K. Hasegawa, et al.
Molecular adsorbed layer formation oncooled mirrors and its impacts on cryogenic
gravitational wave telescopes
Phys. Rev. D, 99 (2019), 22003
A-191
L. Wan, et al.
Measurement of the neutrino-oxygen
neutral-current quasielastic cross section
using atmospheric neutrinos at SuperKamiokande
Phys. Rev. D, 99 (2019), 32005
A-192
K. Abe, et al.
Search for light sterile neutrinos with the T2K
far detector Super-Kamiokande at a baselineof 295 km
Phys. Rev. D, 99 (2019), 71103
A-193
C. Aidala, et al.
Measurements of μμ pairs from open heavy
flavor and Drell-Yan in p + p collisions at √s= 200 GeV
Phys. Rev. D, 99 (2019), 72003
A-194
C. Aidala, et al.
Measurement of charm and bottom
production from semileptonic hadron
decays in p + p collisions at √s = 200 GeV
Phys. Rev. D, 99 (2019), 92003
A-195
J. K. Ahn, et al.
Search for KL → π0νν and KL → π0X0
Decays at the J-PARC KOTO ExperimentJ-PARC Annual Report 2019

Publications

83
Phys. Rev. Lett., 122 (2019), 21802
A-196
J. Guo, et al.
Preferred magnetic excitations in the ironbased Sr1-xNaxFe2As2 superconductor
Phys. Rev. Lett., 122, 017001
A-197
H. Wo, et al.
Coexistence of ferromagnetic and stripetype antiferromagnetic spin fluctuations in
YFe2Ge2
Phys. Rev. Lett., 122, 217003
A-198
C. Aidala, et al.
Nuclear Dependence of the Transverse
Single-Spin Asymmetry in the Productionof Charged Hadrons at Forward Rapidity in
Polarized p + p, p + Al, and p + Au Collisionsat √sNN = 200 GeV
Phys. Rev. Lett., 123 (2019), 122001
A-199
N. Kurita, et al.
Localized magnetic excitations in the fully
frustrated dimerized magnet Ba2CoSi2O6Cl2
Phys. Rev. Lett., 123, 027206
A-200
M. Matsuura, et al.
Lattice Dynamics Coupled to Charge
and Spin Degrees of Freedom in the
Molecular Dimer-Mott Insulator κ−(BEDT−
TTF)2Cu[N(CN)2]Cl
Phys. Rev. Lett., 123, 027601
A-201
M. Mogi, et al.
Large Anomalous Hall Effect in TopologicalInsulators with Proximitized Ferromagnetic
Insulators
Phys. Rev. Lett.,123, 016804
A-202
Y. Sakaguchi, et al.
Structural transformation in GexS100-x(10≤x≤40) network glasses: Structuralvarieties in short-range, medium-range, andnanoscopic scale
Phys. Rev. Mater., 3, 35601
A-203
J. N. Hendriks, et al.
Tomographic reconstruction of triaxial strain
fields from Bragg-edge neutron imaging
Phys. Rev. Materials, 3, 113803
A-204
M. Sakurai, et al.
Molecular weight component dependenceof shish-kebab structure of polyethylene
blends with X-ray and neutron scattering
measurements covering a wide spatial scale
Polym. Crystallization, 2, e10034

A-205
H. Aoki
Chain dynamics in spin-coated films ofpoly(methyl methacrylate) in a solvent
annealing process
Polym. J., 51, 611-616
A-206
T. Maeda, et al.
Thermo-Responsive Nanocomposite
Hydrogels Based on PEG-b-PLGA Diblock
Copolymer and Laponite
Polymers, 11, 250
A-207
M. Abe, et al.
A new approach for measuring the muon
anomalous magnetic moment and electric
dipole moment
Prog. Theor. Exp. Phys., 053C02-1 – 053C02-22.
(2019)A-208
R. Kitahara, et al.
Improved determination of thermal crosssection of 14N(n,p)14C for the neutron
lifetime measurement
Prog. Theor. Exp. Phys., 2019, 093C01
A-209
H. Ekawa, et al.
Observation of a Be double-Lambda
hypernucleus in the J-PARC E07 experiment
PTEP2019, (2019), 021D02
A-210
M. Jiang, et al.
Atmospheric neutrino oscillation analysis
with improved event reconstruction inSuper-Kamiokande IV
PTEP2019, (2019), 053F01
A-211
K. Abe, et al.
Measurement of the muon neutrino
charged-current cross sections on water,hydrocarbon and iron, and their ratios, with
the T2K on-axis detectors
PTEP2019, (2019), 093C02
A-212
F. Kaneko, et al.
A new simultaneous measurement system ofwide Q-range small angle neutron scattering
combined with polarized Fouier transform
infrared spectroscopy
Rev. Sci. Instrum., 90, 093906
A-213
T. Wu, et al.
Nephelauxetic effect of the hydride ligand in
Sr2LiSiO4H as a host material for rare-earthactivated phosphors
RSC Adv., 9, 5282-5287
A-214
S. Hayashida, et al.

Novel Excitations near Quantum Criticality
in Geometrically Frustrated Antiferromagnet
CsFeCl3
Sci. Adv., 5, eaaw5639
A-215
A. Machida, et al.
Hexagonal closed packed iron hydride
behind the conventional phase diagram
Sci. Rep., 9, 12290
A-216
K. Iida, et al.
Quantum magnetisms in uniform triangularlattices Li2AMo3O8 (A = In, Sc)
Sci. Rep., 9, 1826
A-217
Y. Kitanaka, et al.
Uncovering ferroelectric polarization in
tetragonal (Bi1/2K1/2)TiO3–(Bi1/2Na1/2)
TiO3 single crystals
Sci. Rep., 9, 19275
A-218
Y. Kitanaka, et al.
Ferrielectric-mediated morphotropic phaseboundaries in Bi-based polar perovskites
Sci. Rep., 9, 4087
A-219
JG Kim, et al.
Synergetic strengthening of layered steel
sheet investigated using an in situ neutron
diffraction tensile test
Sci. Rep., 9, 43837
A-220
K. Sakurai, et al.
Neutron visualization of inhomogeneousburied interfaces in thin films
Sci. Rep., 9, 571
A-221
D. Ikuta, et al.
Interstitial hydrogen atoms in face-centeredcubic iron in the Earth’s core
Sci. Rep., 9, 7108
A-222
A. Shibata, et al.
Nature of dynamic ferrite transformation
revealed by in-situ neutron diffraction
analysis during thermomechanicalprocessing
Scr. Mater., 165, 44-49
A-223
JW Bae, et al.
In situ neutron diffraction study of phasestress evolution in a ferrous medium-entropy
alloy under low-temperature tensile loading
Scr. Mater., 165, 60-63
A-224
F. Endo, et al.
SANS study on the nano-crystalline

Publications

J-PARC Annual Report 201984
network structure of quenched syndiotactic
polypropylene gels
Soft Matter, 15, 5521-5528
A-225
K. Mori, et al.
Structural and electrochemical features of(Li2S)x(SiS2)100–x superionic glasses
Solid State Ion., 344, 115141
A-226
N. Ishida, et al.
Crystal structure and cathode properties ofdelithiated Li1-xMn1/3Ni1/3Co1/3O2 for Mg
rechargeable batteries
Solid State Ionics, 343, 115080
A-227
Y. Iizawa, et al.
Energy-resolved neutron imaging with highspatial resolution using a superconducting
delay-line kinetic inductance detector
Supercond. Sci. Technol, 32 (2019), 125009

A-228
A. Nishimura, et al.
Effect of neutron irradiation on Nb3Sn wire
Supercond. Sci. Technol., 32 (2019), 24004
A-229
J. Sugiyama, et al.
Desorption reaction in MgH2 studied with insitu μ+SR
Sustain. Energy Fuels, 3, 956-964

monitorVacuum and Surface Science, 62(7), p.400 405, 2019/07
A-232
J. Kamiya, et al.
Turbomolecular pump as main pump in
a high-power proton accelerator vacuum
systemVacuum and Surface
Science, 62(8), p.476 - 485, 2019/08

A-230
K. Hanawa, et al.
Analysis of Reverse Transformation Behavior
in Iron-based Alloys Based on Quantitative
Microstructure Information by Neutron
Diffraction
Tetsu-to-Hagane, 105, 998-1007
A-231
I. Yamada, et al.
Development of a gas distribution
measuring system for 2-D beam profile

Conference Reports and Books
B-001
S. Kishimoto, et al.
64- and 128-pixel Si-APD linear array X-ray
detectors with 0.5 ns time resolution
AIP Conf. Proc., 2054 (2019), 60068

B-007
T. Yamamoto
Future gamma-ray spectroscopic experiment(J-PARC E63) on 4ΛH
AIP Conf. Proc., 2130 (2019), 30005

B-002
K.Miwa, et al.
Σp scattering experiment at J-PARC -- resultsof commissioning run -AIP Conf. Proc., 2130 (2019), 20006

B-008
H. Fujioka, et al.
5ΛΛH Production Experiment by Use of 7Ξ-H
Production and Decay at J-PARC
AIP Conf. Proc., 2130 (2019), 40002

B-003
T. Koike, et al.
Gamma-ray spectroscopy of single
Λ-hypernuclei at J-PARC: results andperspective
AIP Conf. Proc., 2130 (2019), 20011

B-009
Y. Ichikawa, et al.
K and nucleus system studied by 12C(K-, p)
spectrum
AIP Conf. Proc., 2130 (2019), 40017

B-004
T. Nagae, et al.
Observation of a Ξ bound state in the 12C(K-,K+) reaction at 1.8 GeV/c
AIP Conf. Proc., 2130 (2019), 20015
B-005
J. Yoshida, et al.
Status of J-PARC E07: Systematic Study ofDouble Strangeness Nuclei with Hybrid
Emulsion Method
AIP Conf. Proc., 2130 (2019), 20016
B-006
A. Dote, et al.
Fully coupled-channel study of K-pp
resonance in a chiral SU(3)-based KbarN
potential
AIP Conf. Proc., 2130 (2019), 20018

B-010
H. Asano, et al.
Spectroscopic study of the Λ(1405)
resonance via the d(K-, n) reaction at J-PARC
AIP Conf. Proc., 2130 (2019), 40018
B-011
H. Asano, et al.
Spectroscopic study of the Λ(1405)
resonance via the d(K-, n) reaction at J-PARC
AIP Conf. Proc., 2130, 040018
B-012
P. Strasser, et al.
New precise measurements of muonium
hyperfine structure at J-PARC MUSE
EPJ Web of Conf., 198, 00003
B-013
P. Strasser, et al.

New precise measurements of muonium
hyperfine structure at J-PARC MUSE
EPJ Web of Conferences, 198 (2019), 3
B-014
HNT Kim, et al.
Unitarity of neutrino mixing matrix
EPJ Web of Conferences, 206 (2019), 9009
B-015
S. Kumano
High-energy neutrino-nucleus interactions
EPJ Web of Conferences, 208 (2019), 7003
B-016
S. Hashimoto, et al.
Analysis on Enhancement of Thermal
Conductivity in Nanofluids
IMPRES2019, D309 (2019)
B-017
R. Wanison, et al.
A study of the thermal behavior of anitrogen heat pipe for a wide range of heatloads at several filling ratios
IOP Conf. Ser. Mater. Sci. Eng., 502 (2019),
012093
B-018
V. Bayliss, et al.
The liquid-hydrogen absorber for MICEIOP Conf. Ser. Mater. Sci. Eng., 502 (2019),
12150
B-019
F. Kaneko, et al.
Complexation of syndiotactic polystyrene
with branched molecules

J-PARC Annual Report 2019

Publications

85
IOP Conf. Ser. Mater. Sci. Eng., 580, 012036
B-020
Z. Zong, et al.
Commissioning of the SuperKEKB final
focusing superconducting magnet cryogenic
systems
IOP Conf. Ser.: Mater. Sci. Eng., 502, 012119
B-021
M. Watanabea, H. Nojiri
Pulsed magnet system at MLF in J-PARC
J. Neutron Res., 21, 17-22
B-022
Y. Sakaguchi, et al.
High temperature furnace for small-angle
neutron scattering instrument at J-PARC
J. Neutron Res., 21, 23-28
B-023
M. Watanabe, et al.
Development of Compact High Field
Pulsed Magnet System for New Sample
Environment Equipment at MLF in J-PARC
J. Neutron Res., 21, 29-38
B-024
M. Shibayama, et al.
Phenolic Resins - Recent Progress ofStructure and Properties Investigations
J. Neutron Res., 21, 39-45
B-025
H. Hotchi, et al.
J-PARC RCS: high-order field components
inherent in the injection bump magnets andtheir effects on the circulating beam duringmulti-turn injection
J. Phys. Conf. Ser. 1350, 012102 (2019)
B-026
Y. Shobuda, et al.
Coupling Impedance of the Collimator
Without RF-Shields at the RCS in J-PARC
J. Phys. Conf. Ser. 1350, 012113 (2019)
B-027
H. Takahashi, et al.
Development of a beam window protection
system for the J-PARC linac
J. Phys. Conf. Ser. 1350, 012142 (2019)
B-028
Y. Nakazawa, et al.
Development ofInter-Digital H-Mode DriftTube Linac Prototype With Alternative Phase
Focusing for a Muon Linac in the J-PARC
Muon G-2/EDM Experiment
J. Phys. Conf. Ser., 1350 (2019), 12054
B-029
M. A. Rehman, et al.
Beam Control and Monitors for the Spiral
Injection Test Experiment
J. Phys. Conf. Ser., 1350 (2019), 12151

B-030
B. Yee-Rendon, et al.
Beam optics design of the superconducting
region of the JAEA ADS
J. Phys. Conf. Ser., 1350(1), p.012120_1 012120_5, (2019)
B-031
F. Tamura, et al.
Simulations of beam loading compensation
in a wideband accelerating cavity using acircuit simulator including a LLRF feedback
control
J. Phys. Conf. Ser., 1350(1), p.012189_1 012189_7, 2019/12
B-032
B. Yee-Rendon, et al.
Design of the elliptical superconducting
cavities for the JAEA ADS
J. Phys. Conf. Ser., 1350(1), p.012198_1 012198_6, (2019)
B-033
J. Sugiyama
Spin polarized beam for battery materials
research: μ±SR and β-NMR
J. Phys. Conf. Ser., 1350, 012054
B-034
Y. Nakazawa, et al.
Development of Inter-Digital H-Mode DriftTube Linac Prototype With Alternative Phase
Focusing for a Muon Linac in the J-PARC
Muon G-2/EDM Experiment
J. Phys. Conf. Ser., 1350, 012054-1 – 012054-7,(2019)
B-035
P. Strasser, et al.
New precise measurements of muonium
hyperfine structure at J-PARC MUSE
J. Phys. Conf. Ser., 1350, 012067
B-036
M. Otani, et al.
Negative Muonium Ion Production With a
C12A7 Electride Film
J. Phys. Conf. Ser., 1350, 012067-1 – 012067-6,(2019)B-037
Y. Kondo, et al.
Upgrade of the 3-MeV Linac for testing of
Accelerator Components at J-PARC
J. Phys. Conf. Ser., 1350, 012077-1 – 012077-7(2019)B-038
M. Otani, et al.
Disk and Washer Coupled Cavity Linac
Design and Cold-Model for Muon Linac
J. Phys. Conf. Ser., 1350, 012097-1 – 012097-7,(2019)B-039
Y. Kondo, et al.

Upgrade of the 3-MeV Linac for testing of
Accelerator Components at J-PARC
J. Phys. Conf. Ser., 1350, 12077
B-040
M. Otani, et al.
Longitudinal Measurements and Beam
Tuning in the J-PARC Linac MEBT1
J. Phys. Conf. Ser., 1350, 12078
B-041
J. Tamura, et al.
The First Replacement of the RF Window of
the ACS Cavity
J. Phys. Conf. Ser., 1350, 12079
B-042
J. Tamura, et al.
VSWR Adjustment for ACS Cavity in J-PARC
Linac
J. Phys. Conf. Ser., 1350, 12080
B-043
T. Shibata, et al.
The New Eddy Current Type Septum
Magnets for Upgrading of Fast Extraction in
Main Ring of J-PARC
J. Phys. Conf. Ser., 1350, 12101
B-044
R. Muto, et al.
Current status of slow extraction from
J-PARC Main Ring
J. Phys. Conf. Ser., 1350, 12105
B-045
A. Kobayashi, et al.
Studies on coherent multi-bunch tune shiftswith different bunch spacing at the J-PARC
Main Ring
J. Phys. Conf. Ser., 1350, 12114
B-046
K. Sato, et al.
Multi-Ribbon Profile Monitor for high power
proton beam at J-PARC MR Abort LineJ. Phys. Conf. Ser., 1350, 12152
B-047
K. Moriya, et al.
Energy measurement and correction forstable operation in J-PARC
J. Phys. Conf. Ser., 1350, p.012140_1 012140_5, 2019/11
B-048
J. Kamiya, et al.
Evaluation of 2-D transverse beam profile
monitor using gas sheet at J-PARC LINAC
J. Phys. Conf. Ser., 1350, p.012149_1 012149_6, 2019/12
B-049
J. Kamiya, et al.
New design of vacuum chambers forradiation shield installation at beam
injection area of J-PARC RCSPublications

J-PARC Annual Report 201986
J. Phys. Conf. Ser., 1350, p.012172_1 012172_7, 2019/12
B-050
M. Otani, et al.
Negative Muonium Ion Production With a
C12A7 Electride Film
J. Phys. Conf. Ser., 4, 69
B-051
T. Takayanagi, et al.
Development of low inductance circuit forradially symmetric circuit
J. Phys. Conf.
Ser., 1350(1), p.012183_1 - 012183_7, 2019/12
B-052
B. Yee-Rendon, et al.
Electromagnetic design of the low beta
cavities for the JAEA ADS
J. Phys. Conf.
Ser., 1350(1), p.012197_1 - 012197_7, (2019)
B-053
F. Tamura, et al.
Simulations of beam loading compensation
in a wideband accelerating cavity using acircuit simulator including a LLRF feedback
control
J. Phys. Conf. Series, 1350, 12189
B-054
S. Koizumi, Y. Noda
A Variety of Small-angle Neutron Scattering
Instruments Available in Tokyo Area, Japan—Complimentary Use of Accelerator andReactor—JPS Conf. Proc. 25, 011004 (2019)
B-055
I. Tanaka
Necessity and Effectiveness of a Biological
Diffractometer for Installation in Second
Target Station as a New Neutron Pulsed
Source in JapanJPS Conf. Proc. 25, 011015 (2019)
B-056
Y. Nakazawa, et al.
Commissioning of the Diagnostic Beam Linefor the Muon RF Acceleration with H- Ion
Beam Derived from the Ultraviolet LightJPS Conf. Proc. 25, 011028-1 - 011028-7 (2019)
B-057
Y. Kondo, et al.
Development of RFQs at J-PARC
JPS Conf. Proc. 25, 011030-1 - 011030-5 (2019)
B-058
T. Inada, et al.
Micellar Structure of Perfluorooctanesulfonic
Acid in Water Investigated by Combinationof SAXS and SANSJPS Conf. Proc. Vol. 25, 11015

B-059
Y. Sakaguchi, et al.
Sample environment equipment for lightirradiation experiments at J-PARC
JPS Conf. Proc., 25, 11004

B-069
Y. Ueno, et al.
New Precision Measurement of Muonium
Hyperfine Structure
Physica B, 556, 26-30

B-060
M. Nakamura, et al.
Applicability and limitations of G(r, E)
analysis transformed from the inelastic
neutron scattering data
JPS Conf. Proc., 25, 11005

B-070
S. Kanda, et al.
Precision spectroscopy of exotic atoms
involving muonsPhysica B, 562, 148-154

B-061
S. Ohira-Kawamura, et al.
Cryogenic sample environments shared at
the MLF, J-PARC
JPS Conf. Proc., 25, 11018
B-062
K. Akutsu-Suyama, et al.
Neutron Reflectometry Study of Penetrationof Protective Coating Material by Deuterated
Sodium Pyruvate
JPS Conf. Proc., 25, 11019
B-063
Y. Sakaguchi, et al.
Kinetics of silver photodiffusion into
amorphous S-rich germanium sulphide –neutron and optical reflectivity
JPS Conf. Proc., 25, 11019
B-064
K. Kusaka, et al.
Current Status and Future Prospects ofSingle Crystal Neutron Diffractometer iBIXJPS Conf. Proc., 25, 11024
B-065
S. Kuribayashi, et al.
Performance test of the optical interface forSuper-FGD in the T2K experiment
JPS Conf. Proc., 27 (2019), 12014
B-066
R. Kajimoto, et al.
Study on use of superconducting magnet
and first inelastic neutron scatteringexperiment under magnetic field at
4SEASONS spectrometer
Macromol. Symp., 385, 1800156
B-067
S. Itoh, et al.
Progress in High Resolution Chopper
Spectrometer HRC by improving collimatorand Fermi chopper
Macromol. Symp., 385, 1800181
B-068
T. Kikuchi, et al.
Background issues encountered by coldneutron chopper spectrometer AMATERASMacromol. Symp., 386, 1900008

B-071
C. Haddock, et al.
A search for deviations from the inverse
square law of gravity at nm range using apulsed neutron beam
Physica B, 564, 45-53
B-072
Y. Nakazawa, et al.
Development of Inter-Digital H-Mode DriftTube Linac Prototype with Alternative Phase
Focusing for a Muon Linac in the J-PARC
Muon G-2/EDM Experiment
Physica B, 567, 61-64
B-073
N. Nagakura, et al.
New project for precise neutron lifetime
measurement at J-PARC
Physica B, 568, 76-80
B-074
W. Liao, et al.
Negative and Positive Muon-Induced SEU
Cross Sections in 28-nm and 65-nm Planar
Bulk CMOS SRAMs
PoS (ICHEP2018), 341, 138
B-075
M. Yotsuzuka, et al.
Development of the longitudinal beamprofile monitor with high time resolution forrealization of low-emittance muon beam in
the J-PARC E34 muon g−2/EDM experimentProc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), 814-817 (2019)
B-076
K. Shinto, et al.
Fluctuation of H- beam extracted from aradio-frequency-driven H- ion source
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), 824-826 (2019)
B-077
M. Tomizawa, et al.
BEAM OPTICS FOR THE MAGNET RECOVERY
IN 3-50BT BEAM TRANSFER LINE
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpan.,
2019, 579
B-078
H. Yasuda, et al.
J-PARC muon g-2/EDM experiment :Development of the spin rotator for the low

J-PARC Annual Report 2019

Publications

87
emittance muon beamProc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), 371-375 (2019)
B-079
Y. Nakazawa, et al.
Development of RF input coupler for Interdigital H-mode drift-tube linac prototype
with alternative phase focusing in muon
linac
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), 404-407 (2019)
B-080
R. Kitamura, et al.
Bunch shape monitor for the high-intensity
H- beam with 3 MeV using the carbon
material
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), 51-54(2019)
B-081
K. Ohkoshi, et al.
Operation Status of the J-PARC H- Ion Source
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), 554-557(2019)
B-082
Y. Sue, et al.
Bunch size measurement with high time
resolution for RF accelerated muon beamProc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), 55-60 (2019)
B-083
Y. Kondo, et al.
Beam dynamics of a new J-PARC RFQ using
equipartitioning scheme
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), 558-562 (2019)
B-084
M. Otani, et al.
Design of a SRF linac for accelerating muon
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), 566-568 (2019)
B-085
Y. Fuwa, et al.
Performance Test of J-PARC 324 MHz
Klystrons
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), 611-613 (2019)(Internet), p.399 - 403, 2019/08

2019, 849

B-088
F. Tamura, et al.
Ten-year oeration and experianced troublesof J-PARC MR timing
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn. ,2019, THOI07

B-097
M. Furusawa, et al.
INVESTIGATION INTO THE INVERTER UNIT
MALFUNCTION IN J-PARC MR-RF ANODE
POWER SUPPLY
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 853

B-089
F. Tamura, et al.
Next generation timing system for J-PARC
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), p.149 - 152, 2019/07
B-090
K. Yamamoto
History of the residual dose distribution andworker doses in J-PARC 3GeV Rapid Cycling
Synchrotron
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), p.333 - 337, 2019/07
B-091
T. Shibata, et al.
THE NEW LOW-FIELD SEPTUM MAGNET FOR
UPGRADING OF FAST EXTRACTION IN MR
J-PARC
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 361
B-092
D. Naito, et al.
APPLICATION OF THE BETATRON TUNE
CORRECTION SYSTEM IN THE J-PARC MR
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 569
B-093
T. Yasui, et al.
EFFECT OF THE SPACE-CHARGE FOR THE
TUNE AND FOR THE TWISS PARAMETERS IN
J-PARC MR
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 733
B-094
M. Otani, et al.
BEAM DIAGNOSTIC AND TUNING AT THE
J-PARC RFQ EXIT
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 833

B-086
T. Morishita, et al.
Status of Beamline Alignment in J-PARC
Linac
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.
(Internet), 946-949(2019)

B-095
S. Igarashi, et al.
SIMULATION STUDY OF THE BEAM PROFILEOF THE HIGH-POWER BEAM AT THE
EXTRACTION OF J-PARC MR
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 836

B-087
A. OnoDevelopment of ignitron alternative
semiconductor switch and new kicker power
supply for J-PARC accelerator
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.

B-096
R. Muto, et al.
SIMULATION STUDY FOR THE
IMPROVEMENTS OF SPILL STRUCTURE OF
THE SLOW EXTRACTION AT J-PARC MR
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,

B-098
E. Yanaoka, et al.
THE DEVELOPMENT OF A HF AREA MONITOR
DEVICE
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 967
B-099
H. WATANABE, et al.
DEVELOPMENT OF A PARTITION WALL TOPREVENT SCATTERING OF BEAM-WINDOWFRAGMENTS AT J-PARC HADRON FACILITY
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,(2019 ), 535
B-100
M. Yotsuzuka, et al.
DEVELOPMENT OF THE LONGITUDINAL
BEAM PROFILE MONITOR WITH HIGH TIMERESOLUTION FOR REALIZATION OF LOWEMITTANCE MUON BEAM IN THE J-PARC E34
MUON G - 2/EDM EXPERIMENT
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,(2019 ), 814
B-101
R. Kurasaki, et al.
DEVELOPMENT OF A LONG-STROKE PILLOWSEAL FOR THE J-PARC HADRON HIGH-P
BEAMLINE
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,(2019), 302
B-102
H. Sako, et al.
PRELIMINARY STUDY OF RADIATION FROMHEAVY-ION BEAMS AT J-PARC HADRONEXPERIMENTAL FACILITY
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,(2019), 344
B-103
E. Hirose, et al.
A REMOTE HANDLING MAGNET SYSTEM IN A
BRANCH REGION OF A NEW PRIMARY BEAM
LINE AT THE J-PARC HADRON FACILITY (2)Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,(2019), 389
B-104
A. Toyoda, et al.
DEVELOPMENT OF HIGH SENSITIVITYRESIDUAL GAS IONIZATION PROFILEMONITOR FOR J-PARC HADRON HIGH-P
BEAMLINE
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,(2019), 498

Publications

J-PARC Annual Report 2019

88
B-105
Y. Komatsu, et al.
EVALUATION OF BEAM LOSS AT A
BRANCHING POINT OF THE J-PARC HADRONHIGH-P BEAMLINE
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,(2019), 61

B-114
T. Toyama, et al.
ANALYSIS AND UPGRADE PLAN OF THE
TRANSVERSE INTRA-BUNCH FEEDBACK
SYSTEM IN THE J-PARC MR
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 1130

B-106
M. ABE, et al.
MAGNETIC FIELD SHIMMING STRATEGY OF
MUON STORAGE MAGNET FOR g-2/EDM
PRECISION MEASUREMENT
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,(2019), 95

B-115
M. Tajima, et al.
DEVELOPMENT OF 16 ELECTRODES BEAMSIZE MONITORS FOR J-PARC MR
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 1134

B-107
N. Hayashi, et al.
Beam monitor data analysis of interlocked
events at J-PARC RCS
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
1096-1100 (2019).
B-108
T. Shimogawa, et al.
Proposal of nondestructive device for slow
extraction
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
1156-1158 (2019).
B-109
H. Harada, et al.
Study of heavy ion beam acceleration in
J-PARC
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn., 179182 (2019).
B-110
Y. Kurimoto, et al.
EFFECTS OF RIPPLING MAGNETIC FIELD
ON THE HIGH POWER OPERATION OF THE
J-PARC MAIN RING
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 101
B-111
C. Ohmori, et al.
NEGATIVE MUON DECELERATOR FOR
MATERIAL SCIENCE
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 1038
B-112
K. Sato, et al.
DEVELOPMENT AND EVALUATION OF MULTIRIBBON PROFILE MONITOR AT J-PARC MR
ABORT LINE
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 1118
B-113
Y. Sato, et al.
INSTALLATION PLAN OF NEW 2D-BEAMPROFILE-MONITOR BY OTR AND
FLUORESCENCE AT THE J-PARC MAIN RING
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 1125

B-116
T. Shimogawa, et al.
PROPOSAL OF NON-DESTRUCTIVE DEVICEFOR SLOW EXTRACTION
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 1156
B-117
Y. Liu, et al.
BEAM LOSS MITIGATION AND
COMISSIONING PROGRESS AT J-PARC LINAC
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 1159
B-118
K. Hasegawa, et al.
PREPARATION STATUS OF RF SYSTEM FOR
J-PARC MR UPGRADE
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 1169
B-119
Y. Arakaki, et al.
TITANIUM ELECTROSTATIC SEPTA IN J-PARC
MR
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 1173
B-120
K. Hasegawa, et al.
STATUS OF J-PARC ACCELERATORS
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 1235
B-121
F. Tamura, et al.
NEXT GENERATION TIMING SYSTEM FOR
J-PARC
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 149
B-122
A. Kobayashi, et al.
THE INVESTIGATION ON THE TIMESTRUCTURE OF THE WAKE FIELD AT THE
J-PARC MR
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 223
B-123
Y. Kawabata, et al.
FULL-SCALE IMPLEMENTATION OF

POSITIONING SENSOR NETWORK DEVICES
AND DISASTER PREVENTION APPLICATION IN
J-PARC MR
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 253
B-124
M. Nomurai, et al.
APPLYING NEURAL NETWORKS TO
INVESTIGATIONS OF THE INFLUENCE OF
WEATHER CONDITIONS ON THE POWERCONSUMPTION OF J-PARC
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 258
B-125
M. Yang, et al.
RADIATION DOSE MONITOR SYSTEM BASEDON RASPBERRY-PI AND XBEE FOR J-PARC
MAIN RING
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 275
B-126
K. Sato, et al.
DEVELOPMENT AND OPERATION OF THE
EPICS-BASED SOFT-MPS IN J-PARC MR
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 279
B-127
T. Shibata, et al.
THE STUDY OF INVESTIGATION OF THE
SHORTED COIL OF MAGNET
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 366
B-128
J. Takano, et al.
PROCESS AND GUESS OF THE LAYER SHORTIN B15D MAGNET OF J-PARC 3-50BT LINE
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 394
B-129
Y. Morita, et al.
PERFORMANCE TEST FOR PROTOTYPE OF
VHF INPUT COUPLER IN J-PARC MR
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 418
B-130
M. Yoshii, et al.
SCHOTTKY SIGNAL DURING LONGITUDINALDEBUNCHING PROCESS AT J-PARC MR SX
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 506
B-131
K. Satou, et al.
DEVELOPMENT OF GATED IPM SYSTEM FOR
J-PARC MR
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 510
B-132
K. Ohkoshi, et al.

J-PARC Annual Report 2019

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89
OPERATION STATUS OF THE J-PARC H- ION
SOURCE
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 554

Update of MPS modules for J-PARC Linac
and RCS
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn., 271274 (2019).

B-133
M. Otani, et al.
DESIGN OF AN SRF LINAC FORACCELERATING MUON
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 566

B-142
H. Hotchi, et al.
Recent progress of the J-PARC RCS beamcommissioning and operation: efforts torealize a higher beam power beyond 1 MW
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn., 574578 (2019).

B-134
K. Futatsukawa, et al.
INVESTIGATION INTO HUMIDITY
CHARACTERISTICS OF RF DEVICES AT J-PARC
LINAC
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 614
B-135
K. Okamura, et al.
DEVELOPMENT OF A PULSED POWER SUPPLYUTILIZING 13 kV CLASS SiC-MOSFET
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 697

B-143
M. Chimura, et al.
Evaluation of beam-loss suppression
method by nonlinear space charge force in ahigh intensity linac
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn., 728732 (2019).

B-150
P. K. Saha, et al.
Development of two-mirror multi-passlaser system to reduce laser power for laser
stripping injection at J-PARC 3-GeV RCS
Proc. 16th Ann. Mtg. Part. Soc. Jpn., 841-845(2019).
B-151
H. Takei, et al.
Long beam pulse extraction by the laser
charge exchange method using the 3-MeV
linac in J-PARC
Proc. IBIC 2019, p.595 - 599, (2019)
B-152
N. Tsverava, et al.
Development of Ultrathin 12 μm Thick Straw
Tubes for the Tracking Detector of COMET
ExperimentProc. IEEE NSS/MIC 2019 (2019), 9060032

B-144
N. Kikuzawa, et al.
Present status of personnel protection
system at J-PARC
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn., 877880 (2019).

B-153
M. Otani, et al.
NEGATIVE MUONIUM ION PRODUCTION
WITH A C12A7 ELECTRIDE FILM
Proc. IPAC 2019 (2019), 1175

B-136
T. Shibata, et al.
THE NEW HIGH-FIELD SEPTUM MAGNET FOR
UPGRADING OF FAST EXTRACTION IN MR
J-PARC
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 85

B-145
B. Yee-Rendon, et al.
Cavity and optics design of the accelerator
for the JAEA-ADS project
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
p.107 - 111, (2019)

B-154
M. Otani, et al.
DISK AND WASHER COUPLED CAVITY LINACDESIGN AND COLD-MODEL FOR MUON
LINAC
Proc. IPAC 2019 (2019), 1924

B-137
M. Shirakata, et al.
LAYER SHORT ON B15D MAGNET IN J-PARC
3-50BT LINE
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 90

B-146
S. Meigo, et al.
Development of profile monitors on target
for high-intensity proton accelerators
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
p.515 - 519, (2019)

B-155
M. A. Rehman, et al.
BEAM CONTROL AND MONITORS FOR THE
SPIRAL INJECTION TEST EXPERIMENT
Proc. IPAC 2019 (2019), 2557

B-138
T. Sugimoto, et al.
NUMERICAL SIMULATION OF J-PARC MAIN
RING INJECTION KICKER MAGNET TOWARD
1.3MW BEAM OPERATION
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, 998

B-147
Z. Zong, et al.
CRYOGENIC SYSTEMS OF THE FINAL
FOCUSING SC MAGNETS IN THE
SuperKEKB ACCELERATOR PHASE 2&amp;3
COMMISSIONINGS
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
p.983

B-139
Y. Hashimoto, et al.
Status report on multi-ribbon beam-profile
monitor at J-PARC main ring and its beamtransport line
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, FRPI039
B-140
T. Kimura, et al.
Introduction and background of Soft-MPS in
J-PARC MR-MPS
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
2019, THPH003
B-141
H. Takahashi, et al.

B-148
N. Ohuchi, et al.
QUENCHES OF THE FINAL FOCUS
SUPERCONDUCTING MAGNETS IN THE
SuperKEKB PHASE-2 AND PHASE-3 BEAM
OPERATIONS
Proc. 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
p.987
B-149
C. Ohmori, et al.
STATUS OF LIU (LHC INJECTOR UPGRADE) RFCOLLABORATION --DEVELOPMENTS OF RADHARD SOLID-STATE AMPLIFIERProc. 16th Ann. Mtg. Part. Accle. Soc. Jpn.,
2019, 232

B-156
H. Nishiguchi, et al.
EXTINCTION MEASUREMENT OF J-PARC MR
WITH 8 GEV PROTON BEAM FOR THE NEW
MUON-TO-ELECTRON CONVERSION SEARCH
EXPERIMENT - COMET
Proc. IPAC 2019 (2019), 4372
B-157
K. Yamamoto, et al.
Operation status of J-PARC rapid cycling
synchrotron
Proc. IPAC 2019 (Internet), p.2020- 2023,
2019/06
B-158
Y. Sue, et al.
A Bunch Structure Measurement of Muons
Accelerated by RFQ Using a Longitudinal
Beam-Profile Monitor With High Time
Resolution
Proc. IPAC 2019 , 37-40 (2019)
B-159
H. Yasuda, et al.
Design of the Wien-Filter Type Spin Rotator

Publications

J-PARC Annual Report 201990
for the Low-Emittance Muon Beam
Proc. IPAC 2019 , 622-625 (2019)
B-160
J. Tamura, et al.
The First Replacement of the RF Window of
the ACS Cavity
Proc. IPAC 2019 , p.971-973(2019)
B-161
J. Tamura, et al.
VSWR Adjustment for ACS Cavity in J-PARC
Linac
Proc. IPAC 2019 , p.974-976(2019)
B-162
K. Miura, et al.
MAGNET POWER SUPPLY CALIBRATION WITH
A PORTABLE CURRENT MEASURING UNIT AT
THE J-PARC MAIN RING
Proc. IPAC 2019, 1263
B-163
T. Shimogawa, et al.
NEW POWER SUPPLY OF MAIN MAGNETSFOR J-PARC MAIN RING UPGRADE
Proc. IPAC 2019, 1266
B-164
A. Kobayashi, et al.
STUDIES ON COHERENT MULTI-BUNCH TUNESHIFTS WITH DIFFERENT BUNCH SPACING AT
THE J-PARC MAIN RING
Proc. IPAC 2019, 167
B-165
P. K. Saha, et al.
DYNAMIC VARIATION OF CHROMATICITY FOR
BEAM INSTABILITY MITIGATION IN THE 3-GeV
RCS OF J-PARC
Proc. IPAC 2019, 171 (2019)
B-166
Y. Liu, et al.
PROGRESS OF J-PARC LINAC
COMMISSIONING
Proc. IPAC 2019, 1990
B-167
T. Shibata, et al.
THE NEW EDDY CURRENT TYPE SEPTUM
MAGNETS FOR UPGRADING OF FASTEXTRACTION IN MAIN RING OF J-PARC
Proc. IPAC 2019, 1997
B-168
T. Shibata, et al.
THE NEW HIGH FIELD SEPTUM MAGNETSFOR UPGRADING OF FAST EXTRACTION IN
MAIN RING OF J-PARC
Proc. IPAC 2019, 2001
B-169
M. Shirakata, et al.
RADIATION DESIGN OF NEW 30 kW BEAM
DUMP OF J-PARC MAIN RING
Proc. IPAC 2019, 2005

B-170
M. Yamamoto, et al.
VACUUM TUBE OPERATION ANALYSIS FOR
1.2 MW BEAM ACCELERATION IN J-PARC RCS
Proc. IPAC 2019, 2017
B-171
R. Muto, et al.
CURRENT STATUS OF SLOW EXTRACTIONFROM J-PARC MAIN RING
Proc. IPAC 2019, 2311
B-172
K. Okumura, et al.
A CONSIDERATION ON THE TRANSFERFUNCTION BETWEEN RQ FIELD AND SLOWEXTRACTION SPILL IN THE MAIN RING OF
J-PARC
Proc. IPAC 2019, 2315
B-173
M. Tomizawa, et al.
8 GeV SLOW EXTRACTION BEAM TEST FOR
MUON TO ELECTRON CONVERSION SEARCH
EXPERIMENT AT J-PARC
Proc. IPAC 2019, 2322
B-174
Y. Hashimoto, et al.
BEAM PROFILE MONITOR FOR SLOWEXTRACTED BEAM USING MULTI-LAYEREDGRAPHENE AT J-PARC
Proc. IPAC 2019, 2532
B-175
K. Sato, et al.
MULTI-RIBBON PROFILE MONITOR FOR HIGH
POWER PROTON BEAM AT J-PARC MR ABORT
LINE
Proc. IPAC 2019, 2561
B-176
M. Yotsuzuka, et al.
Development of the Longitudinal BeamMonitor with High Time Resolution for a
Muon LINAC in the J-PARC E34 ExperimentProc. IPAC 2019, 2571-2574 (2019)
B-177
F. Tamura, et al.
SIMULATIONS OF BEAM LOADINGCOMPENSATION IN A WIDEBANDACCELERATING CAVITY USING A CIRCUITSIMULATOR INCLUDING A LLRF FEEDBACK
CONTROL
Proc. IPAC 2019, 2863
B-178
T. Yasui, et al.
TUNE SHIFTS AND OPTICS MODULATIONS IN
THE HIGH INTENSITY OPERATION AT J-PARC
MR
Proc. IPAC 2019, 3148
B-179
H. Takahashi, et al.
DEVELOPMENT OF A BEAM WINDOWPROTECTION SYSTEM FOR THE J-PARC LINAC
Proc. IPAC 2019, 3886
B-180
T. Toyama, et al.
IMPROVED FREQUENCY CHARACTERISTICS
USING MULTIPLE STRIPLINE KICKERS
Proc. IPAC 2019, 3893
B-181
S. Li, et al.
THE REALIZATION OF ITERATIVE LEARNINGCONTROL FOR J-PARC LINAC LLRF CONTROLSYSTEM
Proc. IPAC 2019, 4155
B-182
T. Sugimoto, et al.
RECENT IMPROVEMENTS AND FUTUREUPGRADES OF THE J-PARC MAIN RING
KICKER MAGNET SYSTEMS
Proc. IPAC 2019, 4167
B-183
S. Igarashi, et al.
CHALLENGES TO HIGHER BEAM POWER IN
J-PARC: ACHIEVED PERFORMANCE AND
FUTURE PROSPECTS
Proc. IPAC 2019, 6
B-184
C. Ohmori, et al.
CONCEPTUAL DESIGN OF NEGATIVE-MUON
DECELERATOR FOR MATERIAL SCIENCE
Proc. IPAC 2019, 610
B-185
Y. Kondo, et al.
UPGRADE OF THE 3MeV LINAC FOR TESTING
OF ACCELERATOR COMPONENTS AT J-PARC
Proc. IPAC 2019, 960
B-186
M. Otani, et al.
LONGITUDINAL MEASUREMENTS AND BEAM
TUNING IN THE J-PARC LINAC MEBT1
Proc. IPAC 2019, 968
B-187
J. Tamura, et al.
THE FIRST REPLACEMENT OF THE RF
WINDOWOF THE ACS CAVITY
Proc. IPAC 2019, 971
B-188
R. Kitamura, et al.
Development of the bunch shape monitor
using the carbon-nano tube wire
Proc. IPAC 2019, p.2543-2546(2019)
B-189
M. Kinsho, et al.
Effect of nitric hydrofluoric acid treatment
on brazing of alumina ceramics and puretitaniumProc. IPAC 2019, p.4161 - 4163, 2019/06

J-PARC Annual Report 2019

Publications

91
B-190
H. Matsuda, et al.
Measurement of activation cross sectionsof aluminum for protons with energies
between 0.4 GeV and 3.0 GeV at J-PARC
Proc. ISORD-9, 171 - 174 (2019)
B-191
N. Watanabe, et al.
Immortal experimental loop at JAEA; Postprocess and validation
Proc. NURETH-18, (USB Flash Drive), p.248 261, 2019/08
B-192
H. Obayashi, et al.
Steady-state and transient experiments in
mock-up of J-PARC LBE spallation target
system using mock-up loop IMMORTAL
Proc. NURETH-18, 13p. (USB Flash Drive)
B-193
K. Mishima, et al.
Neutron scattering cross section of diamondnanoparticle
Proc. PPNS 2018
B-194
M. Ishikado, et al.
Q Dependence of Magnetic Resonance

Mode on FeTe0.5Se0.5 Studied by Inelastic
Neutron Scattering
Proc. PPNS2018, EPJ Web Conf., 219, 03003

Search for Cosmic-Ray Antideuterons with
BESS-Polar II
Proc. Sci., 358

B-195
R. Kajimoto, et al.
Status of neutron spectrometers at J-PARC
Proc. PPNS2018, EPJ Web Conf., 219, 05002

B-200
J. Tamura, et al.
Electromagnetic Design of the Prototype
Spoke Cavity for the JAEA-ADS Linac
Proc. SRF 2019, p.399-402(2019)

B-196
A. Lavakumar, et al.
In-situ neutron diffraction study on the
deformation of a TRIP-assisted multi-phasesteel composed of ferrite, austenite andmartensite
Proc. PPNS2018, EPJ Web Conf., 219, 10005
B-197
K. Sakai, et al.
Search for Cosmic-Ray Antideuterons with
BESS-Polar II
Proc. Sci. ICRC 2019 (2019), 134
B-198
S. Mihara
Status of MEG experiment at PSI
Proc. Sci. NuFact 2019 (2019), 81
B-199
K. Sakai, et al.

B-201
M. Sugano, et al.
DEVELOPMENT OF SUPERCONDUCTINGMAGNETS FOR LHC LUMINOSITY UPGRADE(6) - FROM DEVELOPMENT OF 2 M-LONG
MODEL MAGNET TO CONSTRUCTION OF
SERIES MAGNET Proc. the 16th Ann. Mtg. Part. Accel. Soc. Jpn.,
p.80
B-202
K. Yamamoto, et al.
SAXS and SANS studies on the phase‐
separated network structure of amphiphilic
copolymer composed of poly(dimethyl
siloxane) and poly(N,N‐dimethyl acrylamide)gels swollen in water and a water/methanol
mixturePure Appl. Chem., 91, 1821-1835

KEK Reports
C-001
Safety Division, J-PARC Center
Annual Report on the Activities of Safety in
J-PARC, FY2018
KEK Internal 2019-6

C-002
I. Yamane
Charge-exchange of 400 MeV H- beam withlaser beam for J-PARC RCS injection
KEK Report 2019-2

JAEA Reports
D-001
Safety Division, J-PARC Center
Annual Report on the Activities of Safety in
J-PARC, FY2018
JAEA-Review 2019-043(2019)

D-002
K. Nakajima, et al.
Presentation Materials Related to Neutron
Instruments in the Technical Study Meetings
for Future MLF
JAEA-Review / J-PARC

OthersE-001
H. Hotchi
Study on beam dynamics of high intensity
proton beam and mitigation of beam loss in
J-PARC RCSFoundation for High Energy Accelerator
Science, 18, 18, (2019)

E-002
C. Ohmori, et al.
From Proton beam acceleration to train
acceleration
High Energy News, 38, 1

E-003
J. Kamiya, et al.
Technolofy of vacuum, Large vacuum
system, J-PARC
New Practical Vacuum Technology, p.908 - 917,
2019/02

Editorial Board (April 2020 – March 2021)

Pranab SAHA (Accelerator Division)

Takayuki YAMAZAKI (Materials and Life Science Division)

Yoshiaki FUJII (Particle and Nuclear Physics Division)

Makoto YOSHIDA (Particle and Nuclear Physics Division)

Shigeru SAITO (Transmutation Division)

Fumihiro SAITO (Safety Division)

Shinji NAMIKI (Users Office Team)

Naomi EBISAWA (Public Relations Section)

Photograph : Person in Tank
Image credit : Yasuhiro MAKIDA

Cover photographs
Photograph ① : Sample alignment for neutron experimentImage credit: Stefanus HARJO

Photograph ② : The Lead Glass Calorimeter for J-PARC E16
Image credit: Sakiko ASHIKAGA

Photograph ③ : Abyss
Image credit: Taihei ADACHIJ-PARC Annual Report 2019Vol.1: Highlight© J-PARC Center
January 2021

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