ANNUALREPORT2 O 2 1
Vol.1: HighlightEditorial Board (April 2022 – March 2023)

Pranab SAHA (Accelerator Division)

Kaoru SAKASAI (Materials and Life Science Division)Toshiyuki TAKAHASHI (Particle and Nuclear Physics Division)

Masami IIO (Cryogenics Section)

Shigeru SAITO (Transmutation Division)

Hajime NAKAMURA (Safety Division)

Masatoshi TSUKADA (Users Office Team)

Naomi EBISAWA (Public Relations Section)

Cover photographs
Photograph ① : Concentrated Line
Image credit: Junko KITAGISHI

Photograph ② : Can You Stand the Heat?
Image credit: Stefanus HARJO

Photograph ③ : First Operation with MUMON-CT
Image credit: Hina NAKAMURA

J-PARC Annual Report 2021
Contents
Preface……………………………………………………………………………………………………………… 1
Accelerators………………………………………………………………………………………………………… 3
Overview of the Accelerator…………………………………………………………………………………… 3
Linac ………………………………………………………………………………………………………… 5
RCS…………………………………………………………………………………………………………… 8
MR………………………………………………………………………………………………………… 10
Materials and Life Science Experimental Facility………………………………………………………………… 13
Overview…………………………………………………………………………………………………… 13
Neutron Source Section…………………………………………………………………………………… 14
Neutron Science Section…………………………………………………………………………………… 15
Neutron Instrumentation Section………………………………………………………………………… 16
Muon Section……………………………………………………………………………………………… 17
Technology Development Section………………………………………………………………………… 19
Particle and Nuclear Physics……………………………………………………………………………………… 21
Neutrino Experiment……………………………………………………………………………………… 21
Hadron Experimental Facility (HEF)………………………………………………………………………… 22
Strangeness/Hadron Experiments ………………………………………………………………………… 23
Kaon Decay Experiment…………………………………………………………………………………… 23
Search for Charged Lepton Flavor Violation………………………………………………………………… 24
Discussion for Future Plan of HEF…………………………………………………………………………… 24
Precise Measurements with Muons………………………………………………………………………… 24
Theory group……………………………………………………………………………………………… 25
Technical Support Group (Esys-Tokai)……………………………………………………………………… 25— Research Highlight —Successfully obtained high-statistics Σ-proton scattering data at Hadron Experimental Facility………… 26— Research Highlight —Upgrades to the Neutrino Beamline Underway for T2K and Hyper-Kamiokande………………………… 28
Cryogenics Section ……………………………………………………………………………………………… 31
Overview…………………………………………………………………………………………………… 31
Cryogen Supply and Technical Support…………………………………………………………………… 32
Superconducting Magnet System for T2K………………………………………………………………… 32
Superconducting Magnet Systems at the MLF…………………………………………………………… 33
Superconducting Magnet Systems at the HEF …………………………………………………………… 33
R&D for the Future Projects at J-PARC……………………………………………………………………… 34

Information System……………………………………………………………………………………………… 37
Overview…………………………………………………………………………………………………… 37
Status of Networking……………………………………………………………………………………… 37
Internet Connection Services for Visitors and Public Users of J-PARC……………………………………… 40
Status of Computing ……………………………………………………………………………………… 41
Transmutation Studies…………………………………………………………………………………………… 43
Overview…………………………………………………………………………………………………… 43
Research and development ……………………………………………………………………………… 44
International and Domestic Cooperation ………………………………………………………………… 48
Safety ……………………………………………………………………………………………………………… 50
Safety……………………………………………………………………………………………………… 51
User Service ……………………………………………………………………………………………………… 53
Users Office (UO)…………………………………………………………………………………………… 54
User Statistics……………………………………………………………………………………………… 56
MLF Proposals Summary - FY2021………………………………………………………………………… 57
J-PARC PAC Approval Summary for the 2021 Rounds……………………………………………………… 59
Organization and Committees…………………………………………………………………………………… 63
Organization Structure……………………………………………………………………………………… 64
Members of the Committees Organized for J-PARC………………………………………………………… 65
Main Parameters ………………………………………………………………………………………………… 71
Events ……………………………………………………………………………………………………………… 73
Events……………………………………………………………………………………………………… 73
Publications……………………………………………………………………………………………………… 81
Publications in Periodical Journals………………………………………………………………………… 82
Conference Reports and Books…………………………………………………………………………… 93
KEK Reports………………………………………………………………………………………………… 102
JAEA Reports……………………………………………………………………………………………… 102
Others……………………………………………………………………………………………………… 102

J-PARC Annual Report 2020

Preface1

Preface

In Japanese fiscal year (JFY) 2021, from April 2021 through March 2022, wemade great progres at J-PARC in many fronts as a few of them are picked up
below.
Still the COVID-19 pandemic continued throughout JFY2021 and madeit difficult for foreign collabolators to visit J-PARC. However by taking various
preventive measures against COVID for J-PARC staffs and domestic users, we
successfully continued operation of J-PARC accelerators and user facilities.

Preface

J-PARC Annual Report 20202

We achieved 740kW stable beam operation of RCS for MLF. In total about 3480
hrs (145 days) of net user beam time corresponding to very high availability of~96.4 % was provided.
One of the major news from MLF is the completion and start commissioningof H-line in the muon facility after ~10 years of construction!
The Main Ring operated and provided beam of 40 and 14 days for HD and
NU, respectively, during April to June. The stable beam at 64kW for HD and
515kW for NU was achieved. After the operation, MR entered long shutdown
for major upgrade for higher beam power. The construction and installation of
all the upgraded components have completed by the end of March, 2022. The
commissioning will be started from April 2022.
During long shutdown, the neutrino group has continued to upgrade thebeam facility to accept higher beam power toward 1.3MW for T2K/HyperK
projects. The hadron experimental facility (HEF) has also continued to upgrade
the facility including the construction of beamline for COMET experiment. One of
the scientific highlights from HEF is the measurements of scattering between Σ (abaryon containing s-quark with very short lifetime of 0.15ns) and proton with thehighest precision ever achieved.
In this volume, we report the progress made at J-PARC in JFY2021.

On behalf of the J-PARC staff members,
Director of J-PARC Center
Takashi Kobayashi

The Separated Drift Tube Linac (SDTL) cavities of J-PARC Linac accelerator.

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 Japanese fiscal year (JFY) 2021 is
illustrated in Fig. 1. The topics related to the beam operation are as follows:(1) Operation for the MLF
The beam operation as an operation run of Run#86,
which started late in November 2020, and continued
on schedule until the end of April 2021. Soon after the

Fig. 1. Accelerator operation in JFY2021..

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4
beginning of JFY2021, on April 5, 2021, the beam power
for the Materials and Life Science experimental facility(MLF) user program increased from 630 kW to 740 kW.
After almost a week-long shutdown at the beginning ofMay, the user program resumed for the MLF at 740 kW
beam power on May 10 as an operation run of Run#87.
However, the beam power for the MLF user program
had to be reduced from 740 kW to 630 kW from June 24
due to insufficient cooling capacity of the cooling water
system of the RCS in summer. The MLF user program
has been performed on schedule until July 20 ,before
the summer shutdown.
The neutron production target of the MLF was
replaced during the summer shutdown. Due to thedelay of the target related work, the beam user operation was postponed to January 15, from the originalschedule of the end of November. The beam power for
the user operation is scheduled at 740 kW as before thesummer shutdown.
We had carried out an accelerator study for about
1 month in December because the MLF user operation
was canceled (as an operation run of Run#88). Afterthe year end’s scheduled shutdown, the linac tuning
was started on January 7 followed by the RCS. The MLF
user program started on January 15 as an operation
run of Run#89 and continued until the end of March asscheduled.

From May 19 to 25, the Main Ring synchrotron (MR)suspended the normal hadron user operation and carried out a test run for the COMET experiment. In thistest operation, a bunched slow beam of 1.8 kW was
extracted at an energy of 8 GeV instead of the usualslow beam extraction done at an energy level of 30 GeV.
This test operation for the COMET phase 1 experimentsucceeded by significantly improving several parameters, such as extraction efficiency and spill duty, which
are very important to realize the goal of the COMET
experiment.
From July, the MR entered a long maintenanceperiod for an upgrade until the fall of 2022.

(2) Operation of the MR for the Neutrino Experiment(FX mode) and Hadron Experiment (SX mode)
The neutrino user operation was carried out from
April 8 to the end of Run#86 at a beam power of 510
kW after HD user operation, which was continued fromMarch 27.
The user program resumed for the hadron on May
11. The maximum beam power of 64 kW was achieved
through repeated adjustments, and the utilization
operation was carried out at this power. The hadronuser program was continued until the end of June.

For the linac, HVDC and SDTL were still dominant.
However, the cause of the stoppages in SDTL was not
the SDTL cavity, most of them were due to malfunctionof LLRF. LLRF troubles were also counted as troubles ineach cavity. The RCS outage was mainly due to RF. The
RF outage was not due to the cavity, but to the failureof the capacitor and the life of the vacuum tube in theamplifier. The MR had only one downtime event, which
was the trouble of the power supply of the QM, but it
was restored within a short period.

The operation statistics for JFY2021 (from April
2021 to March 2022) are shown in Table 1. The net
user operation hours and the beam availability rate foreach experimental facility were as follows: 3,480 hours(96.4%) for MLF; 347 hours (93.6%) for NU; and 954 hours(93.7%) for HD. These statistics show that the linac, the
RCS, and the MR operated with high availabilities.
Figure 2 shows the number of stop events and stoptime by components in JFY2021. The stop time includes
not only the stop events during scheduled operation
but also during beam studies and tuning. There wereseveral causes of the stop.

Table 1. Operation statistics in hours for JFY2021.
Facility

User time (hours)

Net time (hours)

Availability, total (%)

MLF

3,608

3,480

96.4

Neutrino (FX)

371

347

93.6

Hadron (SX)

1,016

952

93.7

J-PARC Annual Report 2021

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5

Fig. 2. Number of stop events and stop time by components in JFY2021.

Linac

Fig. X-1. Operation history of the ion source in JFY2021.

Overview
The J-PARC linac has been operated with a nominal
peak beam current of 50 mA. High availability of morethan 95% (to the MLF), the same as in JFY2020, was also
kept during JFY2021 at the linac. Beam studies havebeen conducted to resolve some issues, such as thebeam loss mitigation and confirmation of the feasibility
for further high intensity operation due to the demandof the downstream facilities.

Accelerator components status
The operation history of the ion source in JFY 2021
is shown in Fig. X-1. Presently, the ion source is being
operated with a beam current of 60 mA for the user operation. At the end of RUN#88, the ion source extracted
more than 75 mA beams for high-intensity beam (1.44
MW equivalent at the RCS) studies at the linac and the
RCS. Figure X-2 presents the history of the continuous
operation time and the beam current increase of the
RF ion source (from 2014). The replacement cycle has

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J-PARC Annual Report 2021

6
almost disappeared, and no trend of increase has been
observed so far. We think that the reason why this result
was different from the previous cleaning is not only due
to the type of acid, but also because the second time wetreated the remaining unwiped areas.
The operation of the ACS cavities was more stable
than the other accelerator sections. The number of tripsof all the ACS cavities was less than once per day.
Fig. X-2. History of the continuous operation time of the RF
ion source.

gradually extended with the increased operational
experience. In RUN#86 (November 20, 2020 – April 30,2021), the continuous operation time of the ion source
has been extended to 3,651 hrs. (5 months), which
was 1.5 times longer than the previous record (2,445
hours in RUN#84). After the operation, it was confirmed
at the test bench that the beam emittance was kept
stable even after the 5-month continuous operation.
No cracks, pinholes or any thickness variation of theenamel coating were observed from a direct investigation of the antenna coil. From these results, the abilityof the J-PARC RF ion source to operate continuously
for 5 months at a peak current of up to 60 mA, with aduty factor of 2 % and injection power up to 30 kW, hasbeen confirmed. The next goal is to achieve a 7-monthlong run, which corresponds to the full duration of the
J-PARC user operation in one year.
The RFQ trip rate was approximately 10 times per
day at 25-Hz beam operation to the MLF in FY2021.
This situation is almost the same as before. To reducethe down time of the linac due to the RFQ trip, an autorestart system for the RFQ trip has been running for two
years. The system prevents about 10 minutes no-beamtime in a day. After about two years of operation, thesystem was found to have no negative impact on RFQ.
After the Great East Japan Earthquake in 2011, we
could not operate with the designed rf power in some
SDTL cavities due to the multipactor effect. After wiping the inner surface of the cavity with acetone, themultipactor region disappeared completely, except in
the SDTL05A. Therefore, we tried wiping by using dilute
sulfuric acid in the summer of 2020, however, the multipactor region did not disappear completely and evenspread again, almost to its former state. In the 2021
summer shutdown, we checked the cavity and foundsome unwiped areas on its inner surface. Then, we
tried to wipe the inner surface again with dilute hydrochloric acid. As a result, the multipactor region has

RF system status
We have been handling two types of klystrons, a
324-MHz klystron and a 972-MHz one. Two failed 324MHz klystrons, whose operation time had lasted morethan 80,000 hours, were replaced in JFY2021. The operation times of the klystrons as of the end of March 2022
are shown in Fig. X-3. Among a total of twenty 324MHz klystrons, six of them reached more than 82,000
hours of operation, which corresponds to the entire
period since the start of the linac operation. Most of the972-MHz klystrons reached more than 50,000 hours ofoperation.
Due to the discontinuation of digital devices,
including the CPU and DSP&FPGA boards, we upgraded

Fig. X-3. The operation time of the 324-MHz klystron (top)and 972-MHz klystron (bottom) as of the end of
March 2022.

J-PARC Annual Report 2021

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7
the digital part by newly developed digitizers for 324MHz acceleration RF stations (RFQ, DTL 1-3, SDTL 01-16)
in 2020 and 2021. The present LLRF feedback system
has been completely replaced by a newly developed
LLRF system based on μTCA.4 for MEBT1 (BUN1, BUN2,
CHOP1, CHOP2) in the summer of 2021. This new system works very well now and is expected to improvethe beam quality with newly implemented functions.
Beam monitor development
It is important to measure and adjust the beamprofile in the transverse and longitudinal directions
because we need to stabilize the beam and mitigate
the beam loss. We have been able to utilize beam monitors that measure a transverse profile in all sectionsof the J-PARC Linac, but not yet the longitudinal one.
Therefore, we have been developing a bunch shapemonitor (BSM) which can measure a longitudinal beamprofile in the Linac. The longitudinal profile measurement was successfully conducted at the MEBT1 withpeak currents of 50 mA and 60 mA in the beam commissioning. Detailed analysis is ongoing combined withthe beam simulation to evaluate the beam emittance.
Previously, BSMs were installed at MEBT1 and
MEBT2, respectively. The new BSM was installed in the
L3BT in the summer of 2021, and this allows measurement of the longitudinal profile of beams accelerated
up to 400 MeV in the Linac. We are currently tuning it to
be used for the beam tuning.
Beam study
We continued beam studies at the interval of theuser operation and before and after long-term shutdown for beam loss mitigation and long-term stability.
Presently the IBSt (intra-beam stripping) in the Hbeam at the ACS section is identified as the dominantsource of the beam loss. The IBSt-mitigation latticewith ACS “temperature ratio” between transverse andlongitudinal planes (T≡Tx,y/Tz) set to be 0.7, i.e. withsystematically reduced quadrupole magnets strength,

was successfully applied in the user operation since
May 2019, and achieved a reduction of residual radiation dose by 40% as compared to that with using an
original equipartition design (T=1). Beam studies were
continued towards the next goals with T=0.5 and 0.3.
Unlike present operation with T=0.7, T=0.5 and 0.3
lattices are in the resonance region. Therefore, the longitudinal focus should be also modified to stabilize thebeam. On the other hand, we need better control of thebeam emittance for a precise lattice setting.
Based on the efforts in the previous years, muchimproved results were achieved for T=0.5 and 0.3 in May
2021, as shown in Fig. X-4, after fine-tuning with iterative matching in the MEBT2. Compared with T=1.0, an
integrated beam loss in the ACS section were mitigatedby 50% and 55% with T=0.5 and T=0.3, respectively.

Fig. X-4. Optimized beam loss pattern measured by beamloss monitors (BLMs) at the ACS section for IBSt mitigation lattices with T=0.3, 0.5 for the first time in May
2021.

On the other hand, we found sensitive dependence ofthe loss mitigation effects on the upstream emittancefluctuation in the later beam study in December 2021.
We plan further studies to investigate and achieve
higher stability and reproducibility of beam parametersfrom the J-PARC linac frontend, together with lattice
study for the reliable application of beam loss mitigation lattices in the future.

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J-PARC Annual Report 2021

8

RCS
Operational status
The output beam power delivered to the MLF was
630 kW at the beginning of JFY2021, and a week later,
it was immediately increased to 740 kW. Meanwhile,the number of the protons for NU was 6.7e13 particles
per pulse, which corresponds to a 510 kW-beam of MR,
and 1.8e13 particles per pulse, which corresponds to a
64.5 kW-beam of MR for HD users. Figure 1 shows thechange in RCS output power with respect to time.

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

This year, the operational status of the RCS was quite
stable and no major incidents occurred. The availabilityof the RCS is summarized in Table 1. The operation time
for the MLF over the year was approximately 3609 h,
excluding the commissioning time, and downtime due
to RCS was approximately 25 h. The availability for the
MLF was evaluated according to these values and it was
99.3%. For the Neutrino and Hadron users, the availabilities of RCS were also kept more than 99%.
Table 1. Summary of availability
Facility

User time(h : m)Trouble in RCS Availability of(h)RCS (%)

MLF

3608 : 48

24 : 52

99.3

Neutrino

371 : 28

1 : 36

99.6

Hadron1016 : 53

4 : 2099.6

Maintenance and improvements
 New RF cavity
In recent years, we tried to confirm the potential of
RCS that can output more than 1 MW beam. Our study
results had revealed that RCS had enough performancecapability to accumulate a 1.5- MW beam. However, theRF system did not have the capability to accelerate abeam of more than 1 MW. Therefore, when we tried toaccelerate a 1.5- MW beam, it was lost in the midst of theacceleration period. This was because the power consumption of the RF exceeded the capacity of the power
supply, but the required current for 1.5 MW acceleration
was quite high and it was not likely to be feasible only
by increasing the capacity of the power supply.
We investigated the reason for the increase inpower consumption and found that a combinationof the push-pull operation of the vacuum tube in theamplifier and the multi-harmonic driving in one cavity causes the unbalance on each tube. In the original
design, upstream and downstream of the acceleration
gap were excited by two tubes independently. Althougheach tube should generate half of the acceleration voltage (12 kV) in the ideal push-pull operation, actually
the anode voltage of VT1 is much larger than VT2 in
multi-harmonic operation. The anode voltage exceeds
the limitation by the un-balance and the requirementof the anode current is increased.
To solve this issue, we developed a new cavity that
ensures that only the downstream of the gap is excited.
This configuration enabled us to reduce the input current of the cavity. We completed construction of one
this new cavity and was installed in the RCS tunnel
during the summer shutdown period of 2021. Figure 2
shows the new cavity in the RCS tunnel.
Finally, we tried to accelerate a 1-MW beam with
the new cavity and confirmed its performance. It canaccelerate a 1-MW beam with less power consumption. The power consumption for this new cavity was
reduced from 820 kW to 487 kW at the 1-MW beam
acceleration. Figure 3 shows a comparison of the anodecurrent for the original (red) and the new cavity (blue).

Fig. 2. New cavity in the RCS tunnel.

J-PARC Annual Report 2021

Accelerators

9

Fig. 5.	Cooling water temperature as a function of the wetbulb temperature and beam power.
Fig. 3.	Anode current of the original cavity and the new cavity
with a 1-MW beam acceleration.

 Recovery of the cooling water performance
In June 2020, we tried to implement a two-day
continuous user operation. However, this 1-MW demonstration showed a serious issue with regards toachieving stability. We found that when the outside
temperature increases, the supply temperature of thecooling water becomes uncontrollable and increases.
This induces the temperature interlock of the vacuum
tube in the RF final stage amplifier. We need to improvethe cooling water system to establish a stable 1-MW
operation in all seasons.
In the summer shutdown period of 2021, we carried out the recovery work of the cooling water system
performance. Our investigation indicated that thislow performance would be due to the contaminationof the heat exchange unit. Therefore, we disassembled and washed the heat exchange unit in the same
period. Fig. 4 shows the plates of the heat exchanger.
In this unit, primary and secondary cooling water flows
alternately between the layered plates. We found outthat the plate surface of the secondary loop was contaminated with sludge. All of the plates were washed bychemical cleaning process in the factory. Figure 5 shows

Fig. 4. Plates of the heat exchanger.

the cooling water temperature as a function of the wetbulb temperature and beam power. After the recovery
work, the cooling water temperature was reduced inspite of the higher beam power.
Beam study results
 Implementation of a smaller vertical injection beta
In the RCS, one of the high radio-activated pointis the chamber of the injection foil. Previous study
results indicated that the source of this activation is thelarge-angle scattering particles caused by the interaction between the foil and the circulating beam. The foilinteraction with the beam also induces the emittance
growth. In order to reduce the foil scattering effect, we
implemented a smaller vertical beta function (β y) of
the injection beam and used a smaller foil. From thenumerical simulation, the original βy of 7 m was minimized to 2 m. This smaller beam enables us to reducethe vertical foil size from 20 mm to 14 mm. The beam
test by using this new injection parameter and smaller
foil showed that the beam loss in the collimator area
was significantly reduced. The foil hitting rate of the circulating beam was also measured to be reduced 30%.
We adopted this new operation parameters in 2021
for a month at 700 kW beam power to the MLF users.
The residual radiation was significantly reduced at the
injection, collimator and the 1st arc section. As a result,a smaller injection beam and a smaller size foil were
implemented for the user operation in March 2022.
 Progress on the kicker magnet (KM) impedance
reduction.
In the 1-MW beam operation, beam instability
occurred with some operation parameters. The beam
instability restricted the allowable operation parameterfor the 1-MW operation. This instability was due to thereflection of the wake voltage from the power supplies

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J-PARC Annual Report 2021

10of the extraction kicker magnets. To solve this issue,
we developed a damping system of the wake voltage
in the power supply. The damping system consists ofdiodes and resistors. We have 8 kicker magnets, andwe installed one damping system in one kicker power
supply. We tried 1 MW beam acceleration with this condition, and the test result indicated that the impedance
and the beam instability were well reduced as expected.
Summary
RCS has established a continuous, stable user operation. In JFY 20021, RCS delivered 6.4e13 ppp proton
beam for 740 kW beam power to the MLF and 6.7e13
ppp, which corresponds to 510 kW beam power at the

MR. These values will be increased steadily with carefulmonitoring of the neutron target status and beam loss.
We carried out two major improvement works. A
New RF cavity was tested. It works well and reduces
the power consumption. The thermal exchanger in thecooling water system was washed. The performance ofthe system seemed to improve and the temperature of
the cooling water was reduced.
We also continued the beam test to reduce thebeam loss. A smaller injection beam with a smaller size
foil and new damping system in the kicker magnet
power supply were successfully implemented, and thisresulted in significant improvements not only for beamloss mitigation but also for a better beam quality.

MR
Operation overview
The MR beam operation was scheduled from April
to June in JFY2021. The beam was delivered either tothe neutrino facility with fast extraction (FX) mode or tothe hadron experimental hall with slow extraction (SX)
mode. For the FX operation the beam was extracted in
one turn with the cycle of 2.48 s. The beam was delivered to the neutrino facility for the T2K long baseline
neutrino experiment. For the SX operation the beam
was extracted in about 2 s of debunched beam spillwith the cycle of 5.2 s. The beam spill was delivered tothe hadron experimental hall to produce various secondary particles for the experimental users.
The operation was mostly stable for both the FX
and SX modes and the availability was 93% as the ratioof the net operation duration to the assigned operation duration. For FX mode, the beam power was 510

Fig. 1. MR beam power in JFY2021. The beam power of SX
and study is shown in red and that of FX and study isshown in blue (out of scale).

14
kW with 2.6×10 protons per pulse. Minimizing thebeam losses and the localization were our concerns.
The beam loss power was maintained at an acceptableamount of about 850 W.
Efforts have been made to increase the higher
beam power for the SX mode. The most importantconcern has been the beam instability, that results inbeam losses, at the debunching process before theextraction. The beam power has been upgraded to 64.5
kW with suppression of the instability (Fig. 1). Beamstudy was performed for a diffuser for the beam loss
reduction during the extraction. A diffuser is a material
installed in front of electrostatic septum (ESS) ribbons.
It is intended to cause multiple Coulomb scatterings tothe beam and to reduce the beam to hit the ESS ribbons. The beam loss was successfully reduced to about
40% with one diffuser with the beam power of 10 kW.
Further improvement is anticipated with two diffusers.
Operation at the extraction energy of 8 GeV was
performed for the COMET experiment. The beam power
was 1.8 kW for phase I of the experiment. The extraction efficiency was improved to 99.1% from the 97.3%
achieved in the previous operation in 2018. The spill
duty was improved to 55% from the 16% in the previous operation.

Circuit breaker incidents
The circuit breaker for the magnet power supplies was accidentally opened on June 29 during the
SX operation. The same incident has occurred several
times. It resulted in the fatal damage of the ESS ribbons

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11
in February 2021. The damaged ESS was replaced witha spare. We have continued the operation with countermeasures for protection of the ESS and installed devices
to search for the cause, such as transformer failure. The
switch of the pressure release valve of the transformer
which was used for the oil pressure sensor turned out
to be broken. We plan to change the switch. Meanwhile,damages of the devices, such as transformers, by thesea water vapor are of serious concern. Besides, we arepreparing an ESS spare for the sustainable SX operation.
Upgrade works toward the 1.3-MW operation
Beam power upgrade is planned with the fastcycling scheme. Long shutdown was scheduled for the
hardware upgrade from July 2021 to May 2022.
Beam power of 500 kW was achieved with a cycle
14time of 2.48 s and accelerated protons of 2.6×10 per
pulse. The next target is to realize a beam power of 750
14
kW with a cycle time of 1.32 s and 2.1×10 protons
per pulse (ppp). Even further beam power has been
demanded from the neutrino user community for the
discovery of CP violation and precise measurement of
the mixing parameters in the lepton sector. A new target of 1.3 MW is planned with the cycle time of 1.16 s
14
and 3.3×10 ppp (Table 1).

and anode power supply for one of the cavities were
installed in JFY2021. Those for the other cavity will be
installed in JFY2022. The present two second harmonic
cavities will be converted to fundamental cavities. The
total number of the fundamental cavities will thenbecome nine, and the accelerating voltage should be
sufficient for the 1.3 s operation.
The injection and FX devices have been prepared
for the faster cycling. For injection kickers, the matching
resistor box was upgraded for countermeasure against
heat of the beam loading. For the FX kickers, the highvoltage charger was upgraded and ready for the 1-Hz
operation. For faster cycling, we plan to replace all septum magnets, two low-field magnets and four high-fieldmagnets. The new low-field septum magnets are eddy
current type magnets (Fig. 3). All these devices will be
installed before the beam test in 2022 except for SM32.
It is one of the four high-field septum magnets. Water
leak in the coil was observed during the test operation.
We decided to make a new coil and the magnet should
be ready for the user operation in JFY2022.

Table 1. Beam Power Upgrade Concept.
Beam
Power

Cycle
Time

Number ofaccelerated protons

Present

500 kW

2.48 s

2.6×1014 ppp

Original
Design750 kW

1.32 s14
2.1×10 ppp

New Plan

1.3 MW

1.16 s

3.3×10 ppp

14

The new magnet power supplies have been
constructed. All six power supplies for the bending
magnets were completed by the end of JFY2020. The
production and installation of new magnet power supplies of quadrupole families of QDN, QFN and QDR werecompleted in JFY2021 (Fig. 2). Present power supplies
are reused for other quadrupole families. Many quadrupole families require new cablings because of the family
configuration change (one family to two families) andthe higher voltage requirement for faster cycling. The
cablings were completed in JFY2021.
Two second harmonic cavities were installed atinsertion A in the summer of 2020. The power amplifierFig. 2. New magnet power supply for a quadrupole family of
QDN.

Fig. 3.	Eddy current type septum magnet for the fast extraction.

Accelerators

J-PARC Annual Report 2021

12
Two additional collimators were installed in
JFY2021. Another collimator is planned for installationin JFY2022. The collimation system in the MR injection
region will be upgraded for a capacity of 3.5 kW beamloss as compared to the present 2 kW.
Further upgrade is planned for the operation of
1.16 s. The number of RF cavities should be increased
for faster acceleration. RF anode power supplies should

be upgraded for the beam loading compensation ofhigh-intensity beams. These upgrades are planned for
JFY2025. Circuits of beam position monitors will be
upgraded for high-intensity beams and more precise
measurements by JFY2024. With the parameter tuningof main magnet power supplies for the 1.16 s operationand the beam tuning for higher intensity, we plan toachieve the beam power of 1.3 MW in JFY2028

Materials and Life Science
Experimental Facility
Overview
The proton power ramp up and instrument
upgrades at the MLF were still progressing under
COVID-19. Although we had to comply with the COVID19 restrictions, the neutron and muon beams were
supplied as normal. The beam power of the MLF wasramped up to 700 kW from 600 kW from April 2021
and the availability at 700 kW was more than 90%.
The MLF received 740 kW during the MR operation
period with slow extraction mode, which is the highest power ever attained for long-term user operation
at the MLF. According to the power ramp up, it became
more important to perform radiation works of targets
maintenance safely and on schedule. From this pointof view, a long enough summer maintenance period
was secured to check the progress carefully by not only
the MLF but also the J-PARC management, which led
to the late start of the user operation in January 2022.
The summer maintenance of 2021 was finished safely

on schedule.
Progress was made in the development of neutron
instruments, such as low-temperature Digital image
correlation technique for hybrid neutron diffraction(BL19), completion of the polarization system of the
Polarized Neutron Spectrometer (BL23), noise reduction method based on deep learning which can shorten
measurement time to one tenth of the conventional
neutron reflectometry measurement on BL17, H2O /D2O vapors supply system, New 2D scintillator detectors for a single crystal diffractometer (BL18) and Fe/
Ge polarizing supermirror with m = 6.2 (the highest
achieved in the world).
In the muon H line, the on-beam commissioning
performed since the first beam delivery in January 2022
was completed successfully, and the S-type experiment(DeeMe; an approved proposal for conducting a muonelectron conversion experiment at J-PARC MLF. http://

Materials and Life Science Experimental Facility

J-PARC Annual Report 2021

14
deeme.phys.sci.osaka-u.ac.jp ). The initial analysis of thesamples returned by Hayabusa-2 was performed using
a non-destructive elemental analysis method with negative muon capture characteristic X-rays at the D-line.
We initiated a series of internal group discussions
to establish MLF’s future plan, "MLF2030", based on theexisting instruments and devices. This plan is expected
to be connected with or to improve the plan of target
station 2 of the MLF.
The users visits from abroad were seriously limited
by COVID-19. Many proposals were canceled and someof them were conducted by beamline scientists withoutuser’s visit. On the other hand, several workshops were
held online, such as the target system workshop withSNS of Oak Ridge National Laboratory, the18th KoreaJapan meeting on neutron science hosted by JSNS (TheJapanese Society for Neutron Science), J-PARC MLF andKNBUA (The Korean Neutron Beam Users Association),

the Annual meeting of industrial application at J-PARC
MLF with 352 participants, including 150 attendees
from companies, collaborative scientific and technicalseries of workshops with the Australia’s Nuclear Scienceand Technology Organisation (ANSTO), the 5th Neutronand Muon School (NM-school) was held as KEK-IINAS(Inter-Institution Network for Accelerator Science)
School for both lectures and remote hands-on (https://mlfinfo.jp/sp/school/5th-nms/index.html).
In conjunction with the reopening of the neutron user program at Japan Research Reactor - 3(JRR-3), J-JOIN was formed by JAEA, KEK, CROSS, Tokyo
University and Ibaraki Prefecture. A portal site of J-JOIN
has been opened which provides one-stop consultation for neutron and muon use to support users, who
are not familiar with that field, to allow access to neutron and muon experiments.

Neutron Source Section
At the beginning of fiscal year 2021, the beam
power was raised to over 700 kW from 600 kW on April
5, which was the highest level of beam power on record
for the long-term user program at the MLF. The stable
operation continued, but due to the humid and hot
weather in the summer, the beam power had to be
decreased to 600 kW again from June 24 in order toincrease the cooling capacity margin of the accelerator
devices. The beam operation ended on July 17, before
the start of the long outage.
The maintenance works during the long outage were carried out carefully and successfully. As thebeam power increases gradually to the final goal of 1
MW, promotion of the radiation work safety, especiallyin the maintenance period, becomes more and more
important. In order to check and review the criteria forradiation work safety and procedures of maintenanceworks, sufficient maintenance period was secured andparallel works that could increase the risk of radiation
release or contamination were avoided to concentrateon each maintenance task one by one. The results ofcheck and review were used to improve the planningof maintenance works from the next year on. These
procedures led to the late start of the user operationfrom January 2022. On October 18, specimens were cut
out from the forefront wall and the beam window of
the used target vessel which was operated with 740 kW

Fig. 1. Cutting machine (top) and structure of the target vessel (middle) and the surfaces of an inner wall specimen(bottom).

at maximum to investigate the efficiency of technologies for pitting damage mitigation, which involve thedouble walled structure with a narrow channel and themicrobubble injection into the mercury flow as shownin Fig. 1. The maximum damage depth on the bulk side

J-PARC Annual Report 2021

Materials and Life Science Experimental Facility

15of the inner wall specimen was less than 1 mm and thesurface of the narrow channel side was almost intact,which was a promising result for the stable beam operation with greater beam power. On November 1, theused mercury target vessel was replaced with a newone with an improved structure of the mercury flow
channel. That is, the bubble generator was installed at
a position 92 mm closer to the beam window than theformer one to increase the bubble number density near
the beam window for promoting the pressure wave
mitigation effect. The maintenance work to replace avacuum pump of the gas process system, which is a crucial device for the target replacement, was a significant
task. It needed special care to suppress the release ofradioactive materials and the requirement was fulfilled

through a well-prepared procedure plan. The remotehandling test of the moderator/reflector assembly was
carried out for the first time since the beam operationof MLF started in 2008.
The cooling tower of the coolant water loop for thedevices of the 3GeV proton beam transport line was
replaced as a countermeasure against aging deterioration. The increased cooling capacity will contribute to astable beam operation in summer.
The beam operation for the user program started
on January 15. The neutron source continued its stable
operation at 730 kW after the long outage period andthe average operational efficiency in fiscal year 2021
reached 95.9 %.

Neutron Science Section
1. User programFor most users from abroad, it is still difficult to visit
Japan because of the COVID-19 restrictions, so, many
proposals have been canceled or some of them havebeen conducted as a deputized experiment by beamline scientists. It was previously reported in Annual
Report 2020 that the 2021A proposal call for short-termand one-year proposals was merged with that for the
2020B period, and no long-term proposals were called
for 2021 due to the delay in conducting the approved
ones of 2018L, 2019L and 2020L. In the period of the
2021B-call, we received 338 neutron proposals, including short-term-, one-year-, NUP (new user promotion)and post deadline proposals. 137 of them have been
approved. Although the number of submitted proposals showed an abrupt drop in 2020A, fortunately it isrecovering and now there are even more proposals
than in 2020.
2. Instruments up to date
BL17 is the neutron reflectometer (NR), whichenables us to study mechanisms or functions of thinfilm material by revealing surface structures and buriedinterfaces. To prove dynamical phenomena varying intime, it was necessary to shorten the measurement time
which is longer in the conventional NR, from several
tens of minutes to few hours for one measurement. The
BL17 team developed a new data processing method
based on deep learning, which can successfully eliminate statistical noise from the raw data obtained in arather short time, like one tenth of the conventional NR[1]. It means that we can effectively extract the signals
out of short measurement data and explore dynamic
behavior of surface or interface.
3. Other activities
It has been over 14 years since the operation of the
MLF started. We always need to look at the future visionof the MLF to improve continuously the facility andneutron science. In order to establish a clear vision of
the MLF potential, we initiated a series of group discussions about the MLF’s future plans, named "MLF2030",
branched into three scientific (or instrumental) groupsof fundamental instruments, elastic instruments, andinelastic instruments. In addition to the scientificgroups, specific device groups of neutron polarization,
detector, vacuum (chamber), and chopper had independently summarized their future direction. We willsoon open our discussions to the public in order to build
our future plan together with the external community.
Australia’s Nuclear Science and Technology
Organisation (ANSTO) is one of the most significant
national infrastructures for research in Australia, operating the research reactor OPAL. The MLF has arranged
cooperation on research and development in neutronscience with ANSTO since 2016. In 2021, the arrangement has entered the second five years and was
expanded to include the registered institute CROSS. At
the beginning of the renewal, collaborative scientificand technical series of workshops were held online,

Materials and Life Science Experimental Facility

J-PARC Annual Report 2021

16
and the following topics were discussed: 1) dynamics, 2) sample environment, 3) reflectometry, 4) small
angle diffraction, 5) structural analysis, 6) neutron
polarization, 7) deuteration, 8) imagining technique,9) computation, 10) industrial.
4. Award
Prof. Hideki Seto received the JSNS (JapaneseSociety for Neutron Science) Science Prize for theapplication and development of neutron scattering tosoft matter research.
Dr. Takashi Ohhara won the Research Award from
Crystallographic Society of Japan for the structuralchemical study with hydrogen atoms as a key by highprecision single-crystal neutron diffraction method.
Reference[1] H. Aoki et al., Sci. Rep., 11, 22711 (2021) .

Neutron Instrumentation Section
The neutron instrumentation section has beendeveloping neutron detectors and neutron supermirror
devices.
3
As for neutron detector development, a He-gas
based multi-wire two-dimensional neutron detector
system has been intensively developed for neutronreflectometers [1]. A new electro-optical circuit board
was produced to increase the count rate capability andreplace the present board (Fig. 1(a)). The board functions to calculate an incident position of a neutronand send digital data to a DAQ system through opticalfibers. The new single board is implemented with new
FPGAs, which accept 128 channels for x and y wires. This
improves the signal processing speed and power consumption, thus ensuring the reliability of the detector

system. The developed board can process the x andy signals far less than the system coincidence time of
0.5 μs, enabling a count rate capability of up to 1.27
MHz (Fig. 1(b)). This board fulfills the requirements forthe high-count-rate MWPC detector system.
As for the supermirror device, a new neutron polarizing supermirror has been developed based on themodified multilayer scheme. A polarizing supermirror
is an optical device that produces highly polarized neutrons with a wide bandwidth by magnetic reflection.
The new polarizing supermirror is based on thousandsof Fe/Ge bilayers deposited by using ion beam sputtering. The thicknesses of the iron layers should bedecreased bellow 3 nm for higher critical angle morethan m = 5, where m represents a factor compared to

( a)

( a)

Ge ( orange) , F e ( blue)

( b)

( b)

40

1.2
Measured signal

30

1
0.8
Counting loss

20

0.6
0.4

10

Counting loss (%)

Measured signal (Mcps)

1.4

1.27

0.2
0

0
0

0.5

1
1.5
Frequency (MHz)2

Fig. 1. (a) A photograph of the developed electro-optical3
circuit board for He based MWPC detector system,and (b) measured count rate characteristics of theelectronics board.

Fig. 2. (a) A schematic of the original (left) and modified(right) layer sequence for the polarizing supermirror, and (b) polarized neutron reflectivity profile with
the new Fe/Ge polarizing supermirror. R+ and R- areshown in red and blue [2].

J-PARC Annual Report 2021

Materials and Life Science Experimental Facility

17that of nickel. However, such thin iron layers lose spontaneous magnetization, where the magnetic reflectivity
decreases significantly. To overcome this problem, amodified multilayer scheme is proposed, where theminimum thickness for the iron layers is kept at 3.5 nm
while those of Germanium decrease to less than 2 nm
(Fig 2(a)). The magnetization of the thin iron layers ismaintained at a high level thanks to the ferromagnetic
interlayer exchange coupling (IEC) between the ironlayers. The new Fe/Ge polarizing supermirror that positively incorporates this ferromagnetic IEC has extended
the magnetic reflection to the higher m - value of 6.2(Fig. 2(b)). This is the highest m -value achieved to datein the world [2].
References[1] K. Toh, et al., Nucl. Instr.& Meth. A 726 169 (2013).
[2] R. Maruyama et al., J. Appl. Phys. 130 083904 (2021).

Muon Section
1.	Commenced production of the third muon production target
In response to the remarks by the Muon Advisory
Committee (MAC) and the International Advisory
Committee (IAC) of J-PARC, the Muon Science Section
received a budget for the production of a new muon target in FY2021. This is to reduce the current risk of operating
without a spare target as a result of the unexpected failure of target Unit #1 in FY2019, which was replaced witha spare (Unit #2). The project will be carried out over two
years, with the target storage container fabricated in thefirst year and the rotating target body in the second year.
This is because it is necessary to reexamine the applicability of the Hot Isostatic Pressing (HIP) technique in advance,
which is the key to target fabrication.
In the meantime, the rotating feeder unit was
replaced as part of the maintenance in the summer shutdown period. It is recommended to replace it every two
years, considering the wear and tear on the bearings. This
was the first time since the rotating target itself has been
replaced, and the work was carried out following careful
preparation (see Fig. 1). However, turbulence in the motor
torque was confirmed during the test operation after thework, presumably caused by misalignment of the joint
connecting the motor shaft and the rotating shaft on thevacuum side.

To resolve this problem, another adjustment was
attempted near the end of the maintenance period.
However, subsequent beam operations revealed that thesituation had not improved, suggesting that the connection accuracy between the motor shaft and the rotating
shaft was inadequate due to manual work. Therefore,
it was decided to replace during the next maintenanceperiod the flexible joint for the connection with one thathas a higher tolerance for shaft misalignment, and themodel selection and testing proceeded.
2.	Commissioning of the H-Line
The H-line, a new beamline, has been under construction since FY2012 in Experimental Hall No.1 of the MLF
building. It is a general purpose beamline that can deliver
both positive and negative muons and has branches totwo experimental areas named H1 and H2. The designed
8
surface muon flux reaches 10 muons/s with a proton
beam power of 1 MW owing to a large acceptance (108mSr) capture solenoid and other beamline magnets withlarge apertures.

Fig. 2. The H1-commissioning team headed by T. Yamazaki(left), and the muon beam profile measured by an imaging plate at the exit to the H1 area.

Fig. 1. A snapshot of the target maintenance work (left)
which was conducted within a greenhouse set-up in
the M2 tunnel (right).

As for the beamline to H1, the installation of coolingwater piping and power cables progressed during thesummer shutdown period and was almost completed by
the end of November. In addition, the review of the facility
modifications, including those for MUSE by the Nuclear

Materials and Life Science Experimental Facility

J-PARC Annual Report 2021

18
Regulation Authority, which had been delayed due to
COVID-19 during this period, was finally completed andoperation permit was granted. The beam commissioning
started in January 2022. During the beam commissioning,a large positron/electron background appeared because
the DC separator had not yet been installed. Although thismade beam commissioning difficult, the commissioning
team was able to measure the beam intensity, profile, andmomentum of the surface muons (see Fig. 2). The beam
intensity of negative muons at several momenta was alsomeasured.
3.	Renovation of the beam kicker system on the
S-LineThe S line is designed and built mainly for surface
muon beams, and the beam kicker system allows muon
experiments to be performed simultaneously in two areas,
S1 and S2, by splitting a double pulse into two single
pulses. The stable operation of the kicker device is very
important as S2 begins operation in 2021.
The kicker device has encountered several problems
since the start of the S-Line operation in 2017. One ofthese is the failure of the MARX board, which continues
to occur several times a year. Since the failure was foundto be caused by a certain component, the replacement of
all 384 components on the MARX board was carried out
during the summer shutdown period before the full-scale
simultaneous operation of the S1 and S2 areas began.

Fig. 3. A schematic illustration of the beam kicker sys-tem before and after the relocation of the power supply.

Drastic measures were also taken during the summer shutdown period to address another issue: thelocation of the kicker power supply. The kicker power
supply was installed inside the concrete shielding of the
S-Line to reduce the potential impact of noise generated
by the electric field kicker on the experimental equipment. Therefore, the concrete shield had to be opened
and replaced every time a MARX board failed, making
the work extensive and difficult. To resolve this issue, thekicker power supply unit was relocated to the power supply yard to facilitate access during repairs (see Fig. 3). Uponthe completion of the relocation work, the entire system
was confirmed to be operational within the required specifications. Since then, although the MARX board failed due
to a cause other than the replaced component, the operation could be resumed within a maximum of half a day
after the failure detection, a significant improvement overthe previous situation in which it took up to seven days toresume operation.
4.	Laser system for Ultra-slow muon
Ultra-low velocity muons can be produced by resonant photoionization of thermal muonium from hot
W-foil targets. In particular, a high-energy pulsed coherent Lyman-α light source is one of the most criticalelements for the efficient generation of ultra-low-velocity
muons. The high photon energy of vacuum ultraviolet
light causes degradation of optical materials over time.
In addition, photochemical reactions that occur between
vacuum ultraviolet light and residual gases cause degradation of the performance of the Lyman-α steering mirror.
Degradation of the optics leads to a loss of ultra-slow muonyield and beam downtime for optics replacement. The surface of the mirror becomes noticeably cloudy when thesame area is continuously irradiated with Lyman-α lightfor an extended period of time.
This year, we introduced a drive mechanism thatchanges the laser reflection position of the mirrors for
vacuum ultraviolet light and restores the reflectivity ofthe two mirrors. This device adds a mirror displacement
function to the mirror mounts that can adjust the horizontal angle and vertical tilt of the mirrors. The mirror mountlocated upstream has a rotation stage to rotate a φ50 mm
circular mirror and a linear-motion stage (30 mm stroke).
The mirror mount on the down-stream side uses a 50 mm
square cylindrical mirror, which introduces horizontal
and vertical motions. These stages have built-in encoders
that record the movement history of the mirror positions,allowing the laser reflective surface to be set to the unirradiated area when the reflectivity of the mirror decreases.
The new mirror steering and displacement device enable
the mirror irradiation position to be adjusted by remotecontrol without opening the vacuum chamber to theatmosphere.

J-PARC Annual Report 2021

Materials and Life Science Experimental Facility

19Technology Development Section
We developed a current-biased kinetic inductancedetector (CB-KID) to perform high spatial resolution
imaging with a high energy resolution and a large
sensitive area. High speed
readout circuit, named
Kalliope-DC, was used toread signals from four output channels of CB-KID
under pulsed neutrons
by a delay-line technique.
Neutrons are converted
Fig. 1. S chematic illustration
into charged particles inof the CB-KID detector.
10a B conversion layer tocreate quasi-particle hot spots in CB-KID. The CB-KID
detects a neutron based on local changes in kinetic
inductances in X and Y meanderlines under modest
DC bias currents (Fig. 1). We demonstrated the spatial
resolution of 16 μm [1] and a homogeneity of neutron
image in a sensitive area of 15 mm×15 mm [2].
As a practical test of the CB-KID imaging, we compared the SEM image with the neutron transmission
image with a test sample containing many Gd islandsof different sizes (Fig. 2) [3]. The gray-colored stripes inFig. 2(a) were produced by re-deposition of the stainlesssteel mask during ion milling of the sample, but they
are not visible by neutrons as in Fig. 2(b). Hence, two Gd
islands in yellow dotted ovals around two Gd islands
are not shown clearly with a SEM probe while those inviolet ovals can be discerned in the transmission imageof Fig. 2(b). We demonstrated a good linearity between
the Gd-islands sizes of neutron images and SEM images
over the wide range from 20 μm to 130 μm (Fig. 3). Fig. 4
shows the CB-KID neutron transmission image (0.1 to
1.13 nm) of a Wood’s metal sample. We found that thebright dendritic lines manifested from a Cd-rich phaseare visible among four-different phases of the Wood’s
metal. This can be utilized as a tool to study the patternformation in solidification of alloy.
In summary, we demonstrated an example of thepractical implementations of the CB-KID neutron transmission imaging as SEM observations can do using
the test sample with various different-sized Gd islands.
We also demonstrated that the CB-KID imaging clearlyobserved a needle-like fine Cd-rich phase while it is
not so easy to observe it with SEM. We consider that
the CB-KID system can widely be used as a useful tool
to investigate various samples in the fields of materialsciences.

(a)
(a)

tail

(b)
tail

Fig. 2. (a) the SEM image and (b) neutron transmission image observed by CB-KID with a Gd test sample deposited on a Si substrate. A Gd island in a dotted squareappears clearly in both images including a fine tail.

Fig. 3. Good correlation of the sizes of the various Gd islands
estimated by the neutron transmission (vertical axis)
and SEM imaging (horizontal axis) over the wide range.

Fig. 4. Neutron transmission
image of a Wood’s
meal taken with neutron wavelengths from
0.1 to 1.13 nm. Needlelike Cd-rich phases canbe seen clearly as oneof the four different
phases of the alloy.

This work was partially supported by a Grant-inAid for Scientific Research (Grant Nos. JP16H02450,
JP21H04666, JP21K13566) from JSPS and the MLF project program (No. 2020P0201).
References[1] H. Shishido et al., Phys. Rev. Applied 10 (2018) 044044.
[2] T.D. Vu et al., Supercond. Sci. Technol. 34 (2021) 015010.
[3] T.D. Vu et al., Nucl. Inst. Meth. Phys. Res. A 1006 (2021) 165411.

Particle and Nuclear Physics

Neutrino Experiments
As continuation of JFY2020 beam run, Neutrino
Experimental Facility restarted beam operation on
April 8th, and ended the JFY2021 run on April 27th.
With stable operation of 510kW beam power, total inte21
grated POT (proton-on-target) since 2009 of 2.17x10
21(so-called neutrino mode) and 1.65x10 (so-called
anti-neutrino mode) were accumulated. The next beam
run is scheduled to start from fall 2022, after one-andhalf-years-long maintenance and improvement work
period.
The T2K Experiment was carried out without
ND280 due to COVID travel restriction. On-axis INGRID,
new detectors Wagasci and BabyMIND were successfully operated. The far-detector SuperKamiokande (SK)
doped with 0.01% gadrinuim was successfully operated,and showed neutron capture rate as expected. SK
will increase the concentration to 0.3% for the coming beam run. Re-analysis of data with a new nuclear
model, new cross section data, and improved flux tuning is in progress.
NINJA experiment, aiming at precision study ofneutrino-nucleus interaction with hybrid emulsion
detectors, successfully carried out a pilot run withheavy-water target and a novel time stamp mechanism.
Many improvement works toward 1.3MW beam
power was carried out in JFY2021, as well as various
maintenance work. One of the biggest works is toreplace magnetic horns with high-power-withstanding
new horns. Construction of the new horns were in progress in Japan and in Colorado. Another big work is toParticle and Nuclear Physics

J-PARC Annual Report 2021

22
replace the heat exchanger of the target with new highcapability one, and design, test, and fabrication was inprogress. Also carried out were fabrication of a newmagnet for the primary beamline and its power supply,
high-speed DAQ, strengthening of interlock, and a new
facility for radio-active water processing. Detail of thework is reported as the Highlight article.
T2K conducted ND280 upgrade to improve detector performance and systematic errors to best utilize
the high-statistics achieved by high beam power.
Construction of new detectors SuperFGD, High-angle
TPC, and ToF detectors were carried out under heavy
disruption by COVID. They are not yet recovered fromthe delay caused by COVID, and investigating the way
to minimize the impact.
HyperK project is proceeding soundly. Excavationof access tunnel was started. New 50-inch PMT fabrication and their test is in progress. Off-site IWCD,
intermediate water Cherenkov detector, is under investigation of site candidate, civil construction methods,

and cost estimation.
At MLF, JSNS2 experiment to search for sterile neutrinos continued data taking until June 22nd with 700kW
beam power. New trigger dedicated for detecting sterile
22
neutrino has been installed, and 1.45x10 POT was accumulated. Blind analysis is in progress for the data. From
January 15, 2022, data taking was resumed and continue
until June. A new step, JSNS-II has started. The TDR was
submitted and stage-II was requested at the PAC meeting. A new detector at 48m from the target, outside of
the MLF experimental hall, is under construction. The
stainless steel tank construction was completed, andfabrication of inside equipments such as acrylic vessel
will be started from 2022.
Dr. Chris J. Densham at Rutherford Appleton
Laboratory, a collaborator of T2K experiment, wasawarded the 2021 Institute of Physics Prize for
Outstanding Professional Contributions to accelerator
science and technology for his novel contribution to
the high-power target.

Hadron Experimental Facility (HEF)
J-PARC Hadron Experimental Facility (HEF) was
developed for the fixed-target particle and nuclear
physics experiments using secondary particle’s beams
produced by slowly extracted (SX) high-intensity proton beam from Main Ring (MR) synchrotron as well as
the 30-GeV primary proton beam. In 2021, the beam
operation to HEF was performed at the maximum
beam power of 64.5kW during March 27th to April 7th
and May 10th to June 29th, including the 8-GeV beamtuning and extinction measurement for COMET experiment during May 20th to 25th. In total 6 experiments
were conducted at K1.8, K1.8BR, KL, and high-p beamlines.
In 2021, about 1 year shutdown of MR operation
has been scheduled for the power supply upgrade. In
this period, construction of new beam line (C-line) for
COMET experiment and change-over of the spectrometer have been processing, in addition to the ordinary
maintenance works. The C-line is branched from thehigh-p beam line (B-line) in Hadron Hall and delivers
8-GeV beam to Hadron South Hall. The constructionof C-line in Hadron Hall including the air-tight andFig. 1. Photograph of the branch point of B (to up direction in
the figure) and C (to right up direction) lines in HadronHall taken before closing the shielding structure.

radiation shielding structure was completed (Fig.1). At
K1.8 area, KURAMA spectrometer with a single dipole
magnet was dismantled. Then three magnets for highresolution S-2S spectrometer with Q-Q-D configuration
were installed.

J-PARC Annual Report 2021

Particle and Nuclear Physics

23

Strangeness/Hadron Experiments
Data-taking of two experiments on X-ray spectroscopy of Ξ−-Fe atom (E03) and search for H-dibaryon (E42)
was completed at K1.8 beam line. These experiments
used KURAMA spectrometer to measure outgoing K+
in the (K−, K+) reaction. Pilot data were obtained to estimate the production rate of Λ3 H and tagging rate of its
mesonic decay for Λ3 H lifetime measurement (E73) at
K1.8BR beam line. Beam and detector commissioning
and Run-0 data-taking were performed at high-p beamline by the E16 which aims to study in-medium massmodification of vector mesons and the generation
mechanism of hadron mass.
Several results from the experiments were published in FY2021, E40 conducted at K1,8 in 2018 to2022 reported differential cross sections for Σ−p, Σ+pelastic scattering, and Σ−p→Λn inelastic scattering(see highlight article). E62 conducted at K1.8BR in 2018
reported measurements of the 3d→2p transition X
rays of kaonic 3He and 4He atoms using superconducting transition-edge-sensor microcalorimeters with anenergy resolution better than 6 eV [1]. The energies of6224.5 ± 0.4 (stat) ± 0.2 (syst) eV and 6463.7 ± 0.3 (stat)± 0.1 (syst.) eV and widths of 2.5 ± 1.0 (stat.) ± 0.14 (syst.)
eV and 1.0 ± 0.6 (stat.) ± 0.3 (syst.) eV were determined,
for kaonic 3He and 4He, respectively. These values are

Fig. 2. Energy shift and width of 2p state of kaonic 3He (red)and 4He(bule) atoms determined by J-PARC E62. Previous measurements are also plotted.

nearly 10-times more precise than in the previous
measurements. These results exclude the large stronginteraction shift and widths as shown in Fig.2. These
results confirmed that the standard antikaon-nucleus
interaction models work well in these atomic systems.
References[1] T. Hashimoto et al., Phys. Rev. Lett. 128, 112503 (2022).

Kaon Decay Experiment
The KOTO experiment studies the decay of a long0
lived neutral kaon into a neutral pion (π ) and a pair ofneutrinos. The process breaks CP symmetry directly andits branching fraction is theoretically well predicted in−11.
the Standard Model as (3.0 ± 0.3) × 10 The detectionof this decay is challenging because only two photons
0from π are observable, and the decay mode has notbeen observed. By examining this ultra-rare decay, a
new source of CP symmetry breaking that can explain
the matter-antimatter asymmetry in the universe may
be revealed.
One of the important issues in studying a rare process is to control backgrounds that come from ordinary
processes. In the analysis of the data accumulated in-5
2016-18, KOTO found that even O(10 ) contaminationof charged kaons in the neutral beam can cause back−10
grounds at the sensitivity level of 7×10 . In order toreduce this background, KOTO had installed a counterto detect charged particles at the entrance of the KOTO
detector, called Upstream Charged Veto (UCV), first in2020 and upgraded it for a better performance in early2021. KOTO continued accumulating data with new
UCV in May-June 2021. Data analysis is underway.
In parallel to the analysis efforts, KOTO is preparing
for the next run. One is the upgrade of the data acquisition system to accommodate a higher beam power.
The other is the further upgrade of UCV, aiming for aless material in the beam and a better radiation tolerance. These upgrades will be finished before the next
beam time in FY2022. In addition, the design of a permanent magnet, which is installed at the end of theneutral beam line and sweeps out the charged kaons,is in progress for further background rejection toward
a future sensitivity.

Particle and Nuclear Physics

J-PARC Annual Report 2021

24

Search for Charged Lepton Flavor Violation
COMET aims to identify muon-to-electron conver-14
sion with a sensitivity higher than 10 . Intensive researchand development were conducted in FY2021.
The cylindrical drift chamber performance was studied in details using cosmic-ray muons. The detector willbe transported to J-PARC in 2022 for the final conditioning before installation to the COMET experiment area.
The construction of a straw tube tracker and the installation of lutetium yttrium orthosilicate (LYSO) crystals forthe electron calorimeter is currently in progress.
The construction of a capture solenoid (CS), which isused to acquire and transport pions / muons producedby the COMET primary proton target is in progress. The
construction of the CS cryostat was successfully completed in 2021, followed by installation of the coil to thecryostat in 2022. The cryogenics system preparation has
taken a great step forward; a liquid helium transfer tube
containing super-conducting cable power lines was

installed and connected to a muon transport solenoid(MTS). The MTS excitation test will be conducted before
summer 2022.
COMET beam line construction completed in
FY2021 and starts beam operation in early 2023 to carryout an engineering run. The proton beam at 8 GeV willbe transported to the COMET primary beam line areaand produce pions / muons on a production target
made of a thin graphite plate. Pions and muons, decay
products of the pions, will be transported to the COMET
experiment area through MTS. A set of diagnostic detectors is installed to measure the beam phase space andbackground.
In parallel to these activities COMET carried out a proton beam extinction factor measurement in May 2021 at
the K1.8BR beam line in Hadron Hall. A new beam injection scheme to MR from RCS was employed to confirm-10
the beam extinction factor better than 10 .

Discussion for Future Plan of HEF
Several workshops both domestic and international
were organized by HEF user community, Hadron Hall
Users’ Association (HUA). The workshops aim to discuss
the future plan of HEF, namely HEF Extension Project,from both physics and facility design sides. Lists of theworkshops are found in HUA web page [2]. Discussions
are summarized in the 3rd White Paper on HEF Extension
Project [3].
The project was reviewed by the international review

committee formed under the J-PARC PAC and Institute ofParticle and Nuclear Studies (IPNS), KEK. The meeting on
the focused review was held on August 10, 11, and 18.
High evaluation for the project was obtained.
References[2]	http://www.rcnp.osaka.u.ac.jp/~jparchua/en/hefextension.
html[3] arXiv:2110.04462 [nucl-ex] 9 Oct. 2021

Precise Measurements with Muons
The precision measurements of the anomalous
magnet moment (g–2) and electric dipole moment(EDM) of muons are in preparation at J-PARC MLF. The
collaboration continued the development of the roomtemperature muon source, linear accelerators, beam
injection beamline, storage magnet, and positron detector. The engineering design of the exterior preparationof the construction site was completed. The majorachievements in this fiscal year are the first beam delivery of surface muon beam in H-line, successful start ofthe muoninum ionization tests at the S2 area, fabricationof the full IH-DTL cavity, and fabrication of rotating quadrupole for the injection beamline.
The virtual workshop on the muon g–2 theory initiative in June 2021

J-PARC Annual Report 2021

Particle and Nuclear Physics

25

Theory GroupThe mission of the theory group at the J-PARC branch
is to investigate the theoretical aspects of particle andnuclear physics in collaboration with the experimentalgroups. The group consists of three IPNS staff members
and four visiting researchers.
Owing to the COVID-19 pandemic, the activities of
the theory group were mainly conducted online. Seminarseries on J-PARC heavy-ion project, and four international

online workshops on “Physics of Omega Baryons at
the J-PARC-K10 beam line”, “GPDs and related topics at
J-PARC”, “First and Second International Workshop on the
Extension Project for the J-PARC Hadron Experimental
Facility,” and two domestic workshops on “Physics at the
J-PARC K10 Beam line” and “J-PARC Hadron 2022” wereorganized by the group members. More than fifteen
research papers were published in 2021.

Technical Support Group (Esys-Tokai)
The electronic systems group constructs electronicsystems for Institute of Particle and Nuclear Study,
KEK and collaborates with other institutes through aframework known as “Open-It.” Regarding the J-PARC
experiments, A MPPC signal digitizer ASIC using 100MHz
10bit ADC was developed and shows good signal-tonoise ratio (Fig. 3). Figure 4 shows a SiC pixel sensor andits performance before irradiation of radiation. We plan
to irradiate the SiC pixel sensor for evaluating its performance for radiation-tolerant applications.

Fig. 3. A MPPC signal digitizer ASIC and ADC spectra with andwithout flash.

Fig. 4. A SiC pixel sensor and the measured spectrum for
241Am.

Particle and Nuclear Physics

J-PARC Annual Report 2021

26

— Research Highlight —Successfully obtained high-statistics Σ-proton
scattering data at Hadron Experimental Facility
In order to elucidate nuclear force that acts between
nucleons (Ns) and forms atomic nuclei, baryon-baryon
interaction by adding strange (s) to up (u) and down(d) quarks and extending Ns to octet baryons including hyperons (Ys) are intensively investigated at Hadron
Experimental Facility (HEF). Scattering experiments
are direct methods to investigate the interactions. For
NN interaction, precise data on not only cross sections
but also spin observables in wide angular and incident
energy range were obtained by proton-proton (pp) or
proton-neutron (pn) scattering experiments. Based onrich data, theoretical models have been constructed. So
called “realistic nuclear force” predicted by these models is basic input for nuclear many-body calculations tostudy nuclei.
On the other hand, YN scattering experiments havebeen difficult and their data are very scarce. So far only
data exist from bubble chamber experiments in 1960s
and experiments using the scintillating fiber or scintillator target in late 1990s. In those experiments, numberof hyperons were limited by their production rates andshort lifetimes and scattered events were recorded andanalyzed by the image-based methods. Carbon in the
scintillation fiber also made backgrounds and degraded
efficiency in the event identification. Consequently
number of data points and their statistics were very
limited. Recently high-statistics Σ hyperon-proton
scattering experiment (J-PARC E40) was successfully
carried out using high-intensity pion beam to produceΣ hyperons and modern detectors which can be operated under high-intensity beam circumstance.
Theoretically the ΣN interaction is predicted asstrongly spin (S) and isospin (I) dependent. The only
4
observed Σ hypernucleus ( ΣHe) [1] is formed by theattraction in the S=1, I=1/2 channel. The spin- andisospin- averaged nuclear potential is known to be
repulsive from the Σ quasi-free production spectra on
several nuclei [2]. Therefore, details of the ΣN interaction
should be investigated by the scattering experiments.
The J-PARC E40 aims to study the ΣN interaction systematically by measuring differential cross sections−+−of Σ p [3] and Σ p [4] elastic and Σ p→Λn [5] inelastic
channels in the Σ momentum range of ~450 to ~800

MeV/c, where P and higher partial waves would contribute. Another interesting topic is the short-range
3+
repulsion in the S1, I=3/2 channel (Σ p). Due to the Paulieffect between quarks, larger repulsive core than that in
the NN channel is expected in this channel, especiallyby the models based on quark picture and this may be
one of keys to understand the origin of the repulsive
core of nuclear force.
The experiment was carried out at K1.8 beam lineof HEF from 2018 to 2020. The experimental setup−
and concept of the Σ p scattering measurement are
shown in Fig.1. Σ hyperons were produced via the±+ ±π p → K Σ reactions on a liquid hydrogen (LH2) target. By measuring momenta of the beam π and the+outgoing K with Beam and KURAMA magnetic spectrometers, respectively, the production was identified
7 −and momentum of Σ was obtained. In total 1.62×10 Σ
7 +and 4.9×10 Σ were accumulated.

Fig. 1. The experimental setup and concept of the Σ−p scattering measurement are shown with an enlarged figure around the LH2 target.

Scattering occurred between the running Σ anda proton in the LH2 target was measured by CATCH
detector [6] surrounding the LH2 target. It consisted of acylindrical scintillation fiber tracker (CFT), BGO calorimeter and scintillator hodoscope (PiID). The direction andenergy of proton can be measured. But only direction
can be measured for pion since pion may pass throughJ-PARC Annual Report 2021

Particle and Nuclear Physics

27
BGO. The events were identified by checking kinemati−
cal consistency. For example, in case of the Σ p elastic
scattering, the recoil proton was detected by CATCH.
The proton kinematic energy can be calculated byassuming the kinematics of the elastic scattering at the−
scattering angle obtained from the Σ momentum vector and the proton direction and is compared with the−measured one. Approximately 4500 Σ p elastic, 2300−+
Σ p inelastic, and 2400 Σ p elastic events were identified. These numbers are typically 100-times larger thanthose in the past experiments.

Fig. 2. Differential cross sections for Σ−p elastic channel obtained in J-PARC E40 (black points) [3]. The error bars
and boxes show statistical and systematical uncertainties. The red points show the previous experimental
data [7] (the same for all incident momenta). The dotted, dot-dashed, and solid lines present the predictionof theoretical models; Nijmegen ESC08 [8], fss2 [9], andχEFT with shadows for error bands [10], respectively.

−

Fig. 3. Differential cross sections for Σ p → Λn.[5]Obviously the data quality has improved drastically;smaller uncertainties and finer angular and incident−
momentum divisions for the Σ p elastic channel and−the first data for the Σ p inelastic channel. The present
data show forward peaked angular distribution as theoretical models predict, although small discrepancies areseen in some models. Theoretical models, however, canbe improved using the present excellent data as inputs.
Experimental techniques developed in J-PARC E40
can be applicable for the Λp scattering experiment innear future. Recently three-body baryon force (3BF) is
discussed in the context of neutron stars. In the studyof 3BF, hyperon scattering experiments are also essential since they provide the basic information on 2-bodybaryon interactions in free space. The precious YN scattering data at present and in future will provide thebetter understanding of nuclear force and high-density
nuclear matter inside neutron stars.
Reference[1] T. Nagae et al., Phys. Rev. Lett, 80, 1605 (1998).

Differential cross sections were obtained from numbers of the accumulated Σs and the identified events,
the effective proton areal density with the correction
by the Σ running path length in the LH2 target, detection efficiencies, and solid angle acceptance of CATCH.
Angular distribution of the differential cross sections for−Σ p elastic and inelastic channels are shown in Fig. 2 and3, respectively, with the previous experimental data [7]and theoretical predictions by Nijmegen ESC08 / ESC16
based on meson-exchange [8], fss2 based on quark picture [9], and chiral effective field theory (χEFT) [10].

[2] P. Saha et al., Phys. Rev. C70, 044613 (2004).
[3] K. Miwa et al., Phys. Rev. C104, 045204 (2021).
[4] T. Nanamura et al., Prog. Theor. Exp. Phys. 2022, 093D01 (2022)[5] K. Miwa et al., Phys. Rev. Lett. 128, 072501 (2021).
[6] Y. Akazawa et al., Nucl. Instr. Meth. A1029, 166430 (2022).
[7] Y. Kondo et al., Nucl. Phys. A 676, 371 (2000).
[8] T. A. Rijken, M. M. Negels, and Y. Yamamoto, Prog. Theor. Phys.
185, 14 (2016).
[9] Y. Fujiwara, Y. Suzuki, and C. Nakamoto, Prog. Part. Nucl. Phys.
58, 489 (2007).
[10] J. Haidenbauer et al., Nucl. Phys. A915, 24 (2013)

Particle and Nuclear Physics

J-PARC Annual Report 2021

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— Research Highlight —Upgrades to the Neutrino Beamline Underway
for T2K and Hyper-Kamiokande
The current T2K (2010—2027) and future HyperKamiokande (HK) (2027—) long-baseline neutrino
oscillation experiments rely on neutrinos produced at
the J-PARC high-power neutrino facility. High statistics
neutrino data are needed to achieve world-leading
neutrino oscillation measurements [1,2].
The T2K and HK neutrino beams are produced byinteractions of high-energy protons from the neutrino
primary beamline with a long graphite production
target in the neutrino secondary beamline. Outgoingparticles from the target are then focused in threeelectromagnetic focusing devices, called horns, andallowed to decay into neutrinos. The number of neutrinos available for these experiments can be increased byincreasing the number of protons, or by improving the
focusing of the neutrino parent particles.
The proton beam power will be increased from 500
kW to 750 kW in 2021/2022, and 1.3+ MW in the future.
Along with 2021/2022 upgrades to the J-PARC Main
Ring (MR) accelerator towards a higher power protonbeam, various upgrades to the neutrino beamline facility are also underway [3]. These upgrades will allow theneutrino facility to accept the upgraded high-power
proton beam from the MR.
The most downstream end of the neutrino primary proton beamline has a high radiation level due
to proton backscattering from and interactions with
the neutrino production target. The radiation levelis proportional to the proton beam power, such that
upgrades towards semi-remote handling of irradiatedbeamline equipment are needed for later stages of T2K
and early stages of HK. In 2021, the most downstream
bending magnet in the neutrino primary beamline was
replaced with a shorter, higher field magnet, as shownin Fig.1. New devices for quick maintenance of activated equipment in this region of the beamline werethen installed in the additional space made available by
the shorter bending magnet.
Upgrades to proton beam monitors are also
underway. A prototype non-destructive proton beamprofile monitor utilizing beam induced fluorescence
was installed in the primary beamline, and final testsof the prototype monitor were carried out in 2021.
Based on these test results, upgrades towards a fullFig. 1. New shorter bending magnet being installed at thedownstream end of the neutrino primary beamline

working monitor will be carried out in 2022. An Optical
Transition Radiation monitor (OTR) continuously measures the proton beam position and profile directly
upstream of the neutrino production target. In 2021,
the spent most upstream horn (Horn 1) and OTR were
removed from the beamline and various tests were
performed on the old OTR system, as shown in Fig.2.
An upgraded OTR system will be installed in 2022.
This work is possible thanks to remote and onsite OTR
experts from Canadian institutes.
In the secondary beamline, horns are used to focus
hadrons of the correct charge sign produced by proton beam interactions with the target. At the sametime, hadrons of the incorrect sign are defocused. This
allows for production of a relatively pure beam of, forexample, muon neutrinos, with a ~3% contaminationof muon antineutrinos at the flux peak. Until 2021, thehorns were run at a current of ±250 kA. A new, additional horn power supply has been installed, allowing
the horns to be run at \(\pm\)320~kA from the next
T2K data-taking period. This increased horn current
will improve the focusing of neutrino parent particles,
increasing the number of, for example, neutrinos by~10%, and decreasing the number of antineutrinos by~5%.
A new Horn 1 and Horn 2 (shown during fabricationin Fig.3) were produced at the University of Colorado
in the United States and shipped to J-PARC. Design

J-PARC Annual Report 2021

Particle and Nuclear Physics

29

Fig. 2. Spent Horn 1 and OTR undergoing inspection in theneutrino secondary beamline facility maintenancearea.

upgrades, especially for the cooling scheme of Horn 2,
will allow these horns to be used at higher proton beam
powers. Preparation work to install the new horns has
been ongoing, and the new horns will be installed in
the secondary beamline in 2022.
At the same time, a new neutrino production target, produced at Rutherford Appleton Laboratory in theUK, will also be installed. An improved cooling system
for the target, to allow the target to accept a higher
power proton beam, has also been developed and will
be installed in 2022.
It is essential to properly handle radioactive water
generated during the neutrino beam production
process. Improvements in the facility for handlingradioactive cooling water are also underway, and a new
dilution tank, which will increase the water processing
capacity by a factor of >5, is under construction.
These J-PARC neutrino facility upgrades to >750

Fig. 3. New Horn 2 under production at the University of Colorado.

kW will be completed in 2022, and then the neutrino
beamline will be ready to accept the upgraded MR proton beam. Further upgrades towards 1.3 MW will becompleted for the HK experiment.
Reference[1] K. Abe et al. (T2K Collaboration), Nature 580, 339 (2020).
[2] K. Abe et al., (HK proto-collaboration), arXiv:1805.04163(2018).
[3] Abe et al., arXiv:1908.05141 (2019).

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 2021

32

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 FY2021.

Liquid nitrogen was also supplied to the users fortheir convenience. Its amount in FY2021 is summarized
in Fig. 2. The MR has been shut down for more than ayear for the upgrade, so the amount of liquid nitrogenusage has decreased compared with the last year.

Fig. 1. Liquid helium supply at J-PARC from April 2021 toMarch 2022.

Fig. 2. Liquid nitrogen supply at J-PARC from April 2021 toMarch 2022.

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
the beam time. The operation time was only 27 days in
April and regular maintenance works were carried out
in the autumn. Figure 3 summarizes the incidents in
the refrigeration system from FY2009. Recent troubles
in FY2021 were caused by wrong stratus signals from a
power source for the magnet to the T2K beam control
system. Fortunately, they did not cause any hardware
damages and the beam time was not suspended.
Fig. 3. Summary of incidents in the Refrigerator
Table 1. Operation history of the T2K superconducting magnet system.

2021
April Ma y

O peration
Maintenanc e

4/3-4/30

2022
J une J ulyAug.

S e pt. Oct.

Nov.

De c.

J a n.

F e b.

Ma r

April

J-PARC Annual Report 2021

Cryogenics Section

33

Superconducting 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 6 to July 22 2021.
Annual maintenance, such as exchange of the oil separation filter, safety valve maintenance and so on, wasperformed from July to the end of November. One of
the major maintenance works was an overhaul of the
He compressor (Fig. 4). The cryogenic operation was
restarted on January 11, 2022, because of the delay ofthe exchange work of the neutron target.
Fig. 4. Uninstalled LHe compressor.

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 systemand superconducting magnets.
Production of the superconducting solenoid magnet for the muon beamline is in progress. The pion
capture solenoid (PCS) is under construction in the factory. A photograph of the fabricated cold masses andthermal shields of the PCS is shown in Fig. 5. Helium
cooling pipe is welded on the support shell structureof the coils and the thermal shield made of 5 mm-thickaluminum plate. Fabrication of the superconducting
magnet (the Bridge Solenoid) to tune the magnetic
field at the exit of the muon beamline was finished andis waiting for cooldown test at J-PARC (Fig. 6).

The magnets are designed to be cooled by a twophase flow of liquid helium which is supplied by ahelium refrigeration system built in HDS. The current
lead box (CLB) for the PCS was fabricated and installedin the HDS in FY2020. Five High Temperature Superconductor (HTS) current leads for 3 kA, 500 A and 250
A are installed. They are cooled not only by cryocoolers but also by the shield helium gas with 40 K supplied
from a helium refrigerator. Figure 7 shows the insert of
the PCS CLB. The cooling and current test of the capture CLB was carried out three times in total. It was
confirmed that the capture CLB could be cooled well
excitation of 2916 A and that various interlocks and thecontrol system also worked well.
The surface equipment, such as cold box and

Fig. 5. Photograph of the fabricated cold masses and thermal
shields of the PCS.

Fig. 6. Picture of the Bridge Solenoid delivered at J-PARC

Cryogenics Section

J-PARC Annual Report 2021

34
current lead boxes for PCS and MTS, and the underground equipment (MTS, TRT) were finally connectedfrom the view point of vacuum, electric and helium

coolant shown in Fig.8. Cooling and excitation test for
the MTS cooling system will be done in FY2022.

Fig. 7. Insert of the PCS CLB

Fig. 8. MTS cooling system

R&D for the Future Projects at J-PARC
The g-2/EDM project aims for the precise measurement of the anomalous magnetic moment andthe electric 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 numerical study of the magnet system onvibration conduction was carried out to evaluate thedynamic magnetic field fluctuation. The simulation
study of the frequency response analysis using FEM
software shows that the vibration caused by the cryocoolers on the cold box was not conducted to thesuperconducting coils at all, thanks to the good vibration isolation system of the cold box, indicating that themagnetic field error caused by the cryocooler vibration
could be ignored.
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
be observed under a static magnetic field with local
homogeneity of 1 ppm. A magnetic field distribution
measurement system has been developed. Figure 9shows the prototype of the system.
NMR probes using pure water are used as standard
probes for magnetic fields with sufficient accuracy. The
possibility of systematic errors omitted from the evaluation cannot be eliminated if only one nuclide is used.
In addition, due to the temperature dependence of themagnetic susceptibility, we are working on the develop3
ment of NMR probes using He gas as the other nuclide.
3
The advantages of He are that its magnetic susceptibility is smaller than that of pure water andits temperature dependence is negligible, and its

Fig. 9. Prototype of magnetic field distribution measurement
system.

J-PARC Annual Report 2021

Cryogenics Section

35
monatomic molecular structure is less indefinite. The
disadvantage is that the density is smaller than that ofpure water and the polarization due to the magnetic
field alone is also smaller, so it is necessary to promote the polarization of the nuclei by other means toincrease the signal intensity.
3
He is polarized by a method called MEOP
(Metastability Exchange Optical Pumping). First, electrons are excited to a metastable state by applying
radio frequency. The excited electrons are then irradiated with a circularly polarized laser beam at 1083 nm
to polarize the electron spins. Finally, the electrons arepolarized by transferring their polarization to anotherground state, 3He nucleus.
The glass cell was cleaned with acetone and etha-7
nol to avoid impurities, baked, evacuated to 10 Pa, and3filled with He. The spectra were obtained by applying
radio frequency to the glass cell (Fig.10), and it was confirmed that the transition to the metastable state had
occurred.
The glass cell should be perfectly spherical tomaintain the polarizability and to suppress the indeterminacy of the magnetic field measurement due to its
shape. The same is true for pure water. However, protrusions remain due to vacuuming and gas sealing. If it ispossible to fabricate a perfectly spherical cell, the measurement accuracy can be expected to improve.

We are currently preparing a laser facility, and assoon as the polarization is confirmed, we will begin
development of the NMR probe as an NMR probe, aiming for accuracy equivalent to or better than that of thepure water probe.
Applied research based on REBCO (rare-earthbarium copper oxide) exhibiting high temperature
superconductivity is underway to realize the futurepion capture system for the muon beamline of MLF
second target station (TS2-PCS). The irradiation effecton REBCO coated conductors has been studied forthe assumption of PCS operation under an extremely
high radiation environment with doses higher than
100 MGy. No significant degradation of critical currentof superconductivity (IC) in REBCO samples was con60
firmed by Co gamma-ray irradiation up to 27.4 MGy.
The superconductivity of REBCO samples disappeared222
at neutron irradiation fluence above 4.11×10 n/m .
Degradation of the superconducting transition temper21
ature and critical current was observed at 8.23×10 n/
2
m . The relationship between the degradation rate of IC
21
2
at 8.23×10 n/m relative to the unirradiated value IC0,
and the measurement temperature is shown in Fig. 11.
The IC/IC0 changes depending on the measurement
temperature. Irradiation studies of conductors andmagnet components will continue to be carried out tounderstand the effects and design the TS2-PCS.

Fig. 10.	3He glass cell that emits light by applying high frequency.

Fig. 11.	Relationship between degradation ratio (IC/IC0) andmeasurement temperature

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

Status of Networking
Since 2002, the J-PARC network infrastructure,
called JLAN, has been operated independently from
KEK- and JAEA-LAN in terms of logical structure andoperational policy. In 2021, the total number of hosts
on JLAN exceeded 5,700, which was a 102% increase
compared to the previous year. The growth curve ofedge switches, wireless LAN access points and hosts(servers and PCs) connected to JLAN are shown in
Figure 1.
SINET is not only a gateway from JLAN to the internet
but also an important connection between the Tokaiand the KEK Tsukuba-sites in J-PARC. In April 2022, theInformation System

J-PARC Annual Report 2021

38
National Institute of Informatics (NII) will upgrade SINET(Japan Science Information Network https://www.sinet.
ad.jp) from version 5 to 6, and the bandwidth capacity between the Tokai- and KEK Tsukuba-sites will be
increased from 10 Gbps to 20 Gbps.
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
and 5 show the statistics of data transfer between the
Tokai- and the Tsukuba-sites through L2VPN provided
by SINET. This shows that the usage level has been

approaching a half of its capacity, especially during theperiod when the Hadron facility was running. At theend of FY2021, in March 2022, the peak value increased
suddenly to 8Gbps, because data transfer was carriedout by the g-2 experiment group.
Figure 6 shows the 5 minutes peak values of the
network traffic for the recent years. The peak value ofdata transfer between Tokai- and Tsukuba-sites throughL2VPN is continuously increased, and since the value
will exceed 10G in near future, we decided to increase
the bandwidth between Tokai and Tsukuba.

Fig. 1. The number of hosts, edge switches and wireless access points on JLAN..

Gbps

Internet outbound
6
5
4
3
2
1
0
Dec-20Feb-21

Mar-21

May-21
Jul-21outbound/2h avg.

Aug-21
Oct-21
Nov-21outbound/5min peakJan-22Mar-22

Fig. 2. Network traffic from JLAN to the internet (2 hours average and 5 minutes peak values).

J-PARC Annual Report 2021

Information System

39

Gbps

Internet inbound
1.4
1.2
1
0.8
0.6
0.4
0.2
0
Dec-20Feb-21

Mar-21

May-21
Jul-21
inbound/2h avg.

Aug-21
Oct-21
inbound/5min peakNov-21

Jan-22Mar-22

Fig. 3. Network traffic from the internet to JLAN (2 hours average and 5 minutes peak values).

Fig. 4. Network traffic form the Tsukuba to Tokai sites.

Fig. 5. Network traffic form the Tokai to Tsukuba sites.

Information System

J-PARC Annual Report 2021

40

Fig. 6. 5 minutes peak values of 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 the User
LAN, they are authenticated by the same ID and password 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 introduced.
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 fiscal year’s usage statistics of GWLAN, User
LAN and the newly introduced eduroam service.

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

J-PARC Annual Report 2021

Information System

41

Status of Computing
Since J-PARC does not have computing resources
for physics analysis and data archive, starting from2009, the KEK central computing system (KEKCC) at the
KEK Tsukuba campus has been mainly used for these
purposes. KEKCC is shared by most of the researchgroups of KEK, including J-PARC. At the Neutrino (T2K),
Hadron and Neutron (MLF) experiments, the data taken
in J-PARC are temporarily saved at their facilities andthen promptly transferred, stored, and analyzed at thesystem in Tsukuba. The storage of the system is alsoutilized as a permanent data archive for their data. The
third upgrade of the system was completed in 2020,
and the computing resources are shown in Table 1.
Figures 8-10 show the utilization statistics of the computing resources in FY2021. The main users who used
the CPU and storage constantly were from the Hadronand Neutrino experiment groups. The MLF group also
started to store data to tapes on the system.

Table 1. Computing resources in the KEKCC.

CPU (Intel Xeon Gold 6230)

15000 cores

RAID Disk (GPFS)

25.5 Peta Bytes

Tape Library (HSM)

100 Peta Bytes

Fig. 8. CPU usage statistics of KEKCC in FY2021.

Fig. 9. Disk usage statistics (left: trend of FY2021, right: annual trend).

Information System

J-PARC Annual Report 2021

42

Fig. 10. Tape library usage statistics (left: trend of FY2021, 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 of highpower accelerators for contributing to human society.
We have developed the J-PARC Transmutation
Experimental Facility (TEF) which consists of two individual facilities: the ADS Target Test Facility (TEF-T)
for irradiation of beam window materials, and theTransmutation Physics Experimental Facility (TEF-P)
for reactor physics study on proton beam driven subcritical cores with bearing minor actinide fuels. The
baseline design of TEF-T and TEF-P is available in thedesign reports JAEA-Technology 2017-003 and JAEATechnology 2017-033, respectively.
In 2021, the Partitioning and Transmutation (P-T)
Technology Evaluation Task Force (TF) was establishedby the Ministry of Education, Culture, Sports, Scienceand Technology (MEXT). The R&D activities on the
P-T technology with ADS were discussed to formulate the next JAEA’s mid- to long-term plan (MLTP) for
JFY2022-2028. In December 2021, the TF made public
the discussion results, “On evaluation of the P-T technology”. One section of the report covers the future
direction of J-PARC TEF, and two important policies areincluded in it.
• It is appropriate to review the experimental facility
with an emphasis on the TEF-T function.
• In addition to challenging the engineering issues of
ADS, it is desirable to consider the specifications ofTest Facility (TEF-T) for irradiation of beam
window materials, and the Transmutation Physics
Transmutation Studies J-PARC Annual Report 2021
Experimental Facility (TEF-P) for reactor physics
study on proton beam driven subcritical cores with44
bearing minor actinide fuels. The baseline designof TEF-T and TEF-P is available in the design
facility with seeking possibilities
benefiting
reportstheJAEA-Technology
2017-003 ofand
JAEA- toversatile needs of potential users.
Technology 2017-033, respectively.
According to the policies, the JAEA’s MLTP states
In 2021, the Partitioning and Transmutation (Pthat “Regarding the J-PARC TEF program, JAEA reframesT) Technology Evaluation Task Force (TF) was
the facility plan based on the results of related R&D
established by the Ministry of Education, Culture,and versatile needs to the facility in addition to nuclear
Sports,Science research.
and Technology(MEXT). The
transmutation”
R&D activities
on the theP-Ttechnology
with toADS
We are reframing
conceptof the facility
comwerediscussedtoformulatethenext
JAEA!s
midply with the policies and the MLTP. The main purpose
to long-term
plan(MLTP)toforof the facility
continues
be JFY2022-2028.
its TEF-T function,Ini.e.,
December
TF madetheirradiation2021,
of ADS’sthestructural
materialspublic
by impinging
the protonresults,
beam to“Onan LBEtarget. Hencediscussion
evaluationof thethefacility
P-T isa kind of a proton
irradiation
facility(Fig. covers
1). In addition,technology”.
One sectionof thereporttheweareexploringhowthefacility
cancontributetoverfuture direction of J-PARC TEF, and two importantsatileareneeds
other thanpolicies
includedin it. the ADS development. Some
ideas
of
the
versatileneeds
are asthefollows:• It is appropriate toreview
experimental• Irradiation of materials used in high-energy accelfacility with an emphasis on the TEF-T function.
erator facilities, such as J-PARC, fusion reactors and• In addition to challenging the engineering
fission reactors,
issues of ADS, it is desirable to consider the• testing of the soft-error of semi-conductor devices
specifications of the facility with seeking
by utilizing high-energy neutrons generated in thepossibilities
of benefiting to versatile needs of
LBE target,
potentialusers.
of radioisotopes for medical use, and so• production
Accordingtothepolicies, the JAEA!s MLTP stateson.
that “Regarding
J-PARCTEF
JAEA
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onprogram,the lead-bismuth
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eutecticthe(LBE)targetplan
technology,
campaign
materials
corrosion
test
for
7,000
hours
under
oxygenrelated R&D and versatile needs to the facility inconcentration controlled high-temperature LBE flowing using the OLLOCHI loop is in progress. As of the end••

testing of the soft-error of semi-conductor
devices by utilizing high-energy neutrons
generated in the LBE target,
production of radioisotopes for medical use,and so on.
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2017-003

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Technical Design Report on J-PARC Transmutation Experimental Facility

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Fig.
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idea of idea
the proton
protonirradiation
irradiation
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facility.
As for2022,
the theR&D
onabout
the lead-bismuthof March
testactivities
has reached3,000 hours.
As for the
R&D activities
the proton beam
eutectic(LBE)
target ontechnology,
the techthird
nology,aseriesofmeasurementsofneutronproduction
campaign of materials corrosion test for 7,000
yields fromiron,
lead andbismuth targets
bombarded
hours
under
oxygenconcentration
controlled
highby a 107-MeV proton
beam provided
by theFFAG acceltemperature
LBE flowing
using theOLLOCHIloop
eratorat
Kyoto
University
has
been
mostlycompleted.
is in progress. As of the end of March 2022, theAssembling of a superconducting spoke cavity for ADS’s
test has reached about 3,000 hours.
linac by electron beam welding has started.
As for the R&D activities on the proton beam
In February 2022, the eighth TEF Technical Advisory
technology, a series of measurements of neutronCommittee (T-TAC) was held online. This year, the T-TAC
production yields from iron, lead and bismuth
was specifically asked to advice on concrete approachtargets
bombarded
a 107-MeV
protonto implement
the R&Dby
activities
in line withthe beam
next
provided
by
the
FFAG
acceleratorat
Kyoto
JAEA’s MLTP. The main conclusion was as follows: “It is
University
beenrecommended has
to carefully
set themostly
priorities completed.
of the proposed activities given the available resources from FY
2022 on.”Research and development
Management of the lead-bismuth eutectic is oneof the key issues of the ADS. At J-PARC, various research
activities, such as operation of a corrosion test loop
“OLLOCHI”, operation of a spallation target mockup
loop “IMMORTAL”, and development of various sensors
for LBE are underway. In addition, we published technical reports on the two test loops [1-2].
OLLOCHI
After the first campaign of corrosion test in
OLLOCHI (Oxygen-controlled LBE LOop Corrosion tests
in HIgh-temperature) [1], we started the second campaign of corrosion test in April 2021 and finished inJuly 2021. The total operation period was about 2,000
hours. In the second campaign, to confirm the effect of
pre-oxidation of steel specimens, one of two specimen

holders was held at 430˚C for 100 hours in LBE at saturated oxygen concentration (OC) prior to testing. The-6
OC was then adjusted to 1 × 10 wt% and the otherspecimen holder was loaded in LBE. Test conditions
were the same as those in the first campaign; maximum
temperature and temperature difference were 450˚C

Fig. 2. Outline of specimen before and after the corrosion test.

J-PARC Annual Report 2021

Transmutation Studies

45
and 100˚C, respectively. The flow rate was about 1 m/s
at the specimen position. The tested specimens weretaken out from the specimen holders shown in Fig. 2
and are being observed.
The third campaign of long-term corrosion test for
7,000 hours, which corresponds to the yearly operating
hours of the ADS, started in November 2021 and will becompleted in the fall of 2022.
IMMORTALIMMORTAL [2] is a mockup loop of LBE spallation
target in TEF-T. In the loop, LBE, pressurized water, andatmospheric water were employed as coolants for primary, secondary, and ternary systems, respectively. The
ternary system is equipped with a water-cooled chiller
with a capacity equivalent to the rated output (50 kWmax.) of a heater module (HM) installed in the primary(LBE) system. To further improve the stability of the heatbalance between each cooling system, the chiller in the
ternary system was replaced with an air-cooled heatexchanger.
Figure 3 shows the measured heat balance in the
primary system after replacement of the ternary coolingsystem. Averaged heat exchange was 18.7 kW. It can be
confirmed that the heat input at HM and heat removal
at PHX are almost identical and stable. Previously, thevalues of HM and PHX were more unstable and sometimes differed due to the unstable performance of thechiller. The renewal of the equipment has made it possible for both to remain at approximately the samevalue, thus enabling IMMORTAL to operate in a stable
heat balance. In the future, measurement of single tube
heat-transfer of LBE and experiment of transient behavior, such as a Loss of flow accident, will be performed.

[2] H. Obayashi, et al., Development of Mock-up Test Loop
(IMMORTAL) for LBE Spallation Target, JAEA-Technology 2021035, (2022), 66p. DOI:10.11484/jaea-technology-2021-035

EM flow velocity probe development
Local velocity measurement in the LBE under theoperation temperature conditions of the LBE spallation target or ADS is important to evaluate validity of
the numerical flow field analyzed by the existing CFD
codes. The temperature range assumed in the LBE flowing in these facilities reaches 250˚C and up to about
450˚C. Due to lack of heat resistance of the existingmeasurement methods, the velocity measurement insuch temperature range so far is still difficult. In JAEA,
an electromagnet flow velocity probe (EM probe) which
can be applied to the LBE temperatures up to 500˚C andis equipped with constant sensitivity for the velocities,
regardless of the various temperatures, has been continuously developed.
Prototype EM probe was applied to high temperature LBE up to about 500˚C in FY2020, by using NALTO(Nimble velocity measurement Apparatus in LBE with
controlled Temperature and Oxygen potential) which
is a functional test apparatus utilizing a rigid body rotation characteristic of the LBE. As a result, we successfully
confirmed a clear linearity between the velocity andthe output voltage of the probe. However, we also
recognized attenuation of the voltage signal due todemagnetization of the core for the electromagnet,
depending on the LBE temperature. Hence, as shown in
Fig. 4, an EM probe without the core material was manufactured as a new prototype sensor in FY2021. Then,
we started to accumulate experimental results to checkthe probe’s performance.
Furthermore, we have also performed static corrosion test to upgrade durability of electrodes for the EMprobe. Three tested materials and a reference material
were W, Mo, Zr and SS316L, respectively. In the test, theLBE temperature was set at 450˚C. Oxygen concentra-6
tion was kept at 1×10 wt%. The total test period was
6.35 mm

460 mmSensor holder

Fig. 3. Measured heat balance in the primarycooling system of IMMORTAL.

Electrodes: SS316L
Electrodes: SS316L
0.124 mmElectrical connector

Insulation coating:
Silicone-ceramic sealantSignal out

References[1] S. Saito, et al., Development of High Temperature LBE
Corrosion Test Loop "OLLOCHI", JAEA-Technology 2021-034,(2022), 94p. DOI:10.11484/jaea-technology-2021-034

Three
Coils
Coils

Alumina
Aluminainsulation tube
insulation
tube
2 mm

Current out
Current in

Guide tube: SS316L
6.35 mmFig. 4. Details of a new prototype EM probe.

Transmutation Studies

J-PARC Annual Report 2021

46

Beam transport to the target
After developing the reference design for the
JAEA-ADS linac, the next step is the design of the beamtransport to the target (BTT) that carries the beam fromthe end of the linac to the beam window and onto thespallation target, with a specified beam profile, current
density, and beam loss.
The JAEA-ADS BTT has to transport efficiently a30-MW beam with high beam power stability and low
peak density to ensure beam window integrity, which isa primary concern for the ADS. Additionally, the designof the BTT must be compatible with the establishedreactor design, and the elements that comprise the BTT
must facilitate the maintenance and replacement of
the fuel and the beam window. To this end, a robustcompact BTT design was developed through massive
multiparticle simulations.
Figure 5 shows the schematic view of the BTT andthe radial distribution of the proton beam for an error
study comprising element errors (e.g., misalignment)
and input beam errors, such as emittance growth. The
BTT smoothly increased the transverse beam size todecrease the peak beam current density at the target
and confined the beam loss inside the reactor section,
which has the proper shielding and cooling. The analysis confirms that the BTT design satisfies the stability
requirements for the JAEA-ADS system. In future work,
nonlinear optics will be studied to reduce the peakbeam current density and decrease the beam loss.

Measurement of nuclide production cross sections
In the analyses of induced radioactivity and radiation shielding of the ADS, in-depth cross-section dataof radioactive nuclides produced from the nuclear
reactions are required. So far, we have obtained thenuclide-production cross section data for a wide rangeof target nuclei (e.g., Be, Al, Mn, Co, Bi, and Pb) using
the J-PARC proton beams. In FY2021, we measured thenuclide-production cross sections for Si, which represents the important material of the ADS beam monitor.
In this experiment, nuclide-production cross-section data at incident proton energies of 0.4, 1.2, and 3.0
GeV were successfully acquired with an experimental
uncertainty of <4%. Figure 6 compares the obtained
22
Na production cross section with the evaluatedcross sections contained in the evaluated nuclear datalibrary, JENDL/HE-2007, and experimental data measured by Michel et al. The result demonstrated that ourdata are generally in line with those by Michel et al. andthat JENDL/HE-2007 fails to reproduce the experimental data. Note that our data are more precise than thoseby Michel et al.
For further validation of the evaluated data, thenuclide-production cross-section measurements will
be continued, and then the evaluation of nuclide-production cross sections will be improved based on themeasured data and results obtained.

Cross Section of 22Na [mb]1000 h. As a result, no significant corrosion to the materials was observed. Detailed evaluation of the candidate
materials is continuously needed.

30
25This work
JENDL/HE-2007
R.Michel+(1997)
R.Michel+(1989)
R.Michel+(1995)

20
15
10
10−1

1
Proton Energy [GeV]

Fig. 6. Proton-induced 22Na production cross section for Si.

Fig. 5. Schematic view and radial distribution for beam error
studies of the JAEA-ADS BTT.

Measurement of thick-target neutron yields
For the research and development of ADS and fundamental research on the ADS reactor physics using the
Kyoto University Critical Assembly (KUCA) combinedwith the Fixed-Field Alternating Accelerator (FFAG)
accelerator, an experimental program to measure
nuclear data related to the ADS has been conducted,

J-PARC Annual Report 2021

Transmutation Studies

47
entrusted by MEXT (FY2019 – FY2022). Under thisframework, we measured proton-induced neutronproduction double-differential thick target neutron
yields (TTNYs) for Fe, Pb, and Bi targets, which represent
important materials for the ADS beam window andspallation target, with the time-of-flight method using
the 107-MeV proton beam accelerated from the FFAG
accelerator at Kyoto University.
Figure 7 shows the 107-MeV proton-induced TTNYs
for Pb measured at detector angles of 5°, 60°, 90°, and120° in comparison with calculation results using different types of nuclear reaction models implemented
in the Monte Carlo particle transport code system,PHITS (i.e., current and former default models). For bothmodels, the results revealed distinctive discrepancies
between the calculation results and the measured datafor high energy neutrons. The obtained TTNYs for Pb
and Bi are the world’s first data in the energy domainof ~100 MeV. The data and findings obtained in thisexperiment are expected to help improve the nuclear
reaction models.

Fig. 7. 107-MeV proton-induced TTNY for Pb.

Benchmarking Experimental Data Obtained to
Validate Nuclear Data for ADS
A fast neutron system dedicated to transmutation(accelerator-driven system: ADS) has been investigatedto reduce the environmental burden of high-level
radioactive waste (HLW). ADS is capable of converting
partitioned long-lived nuclides with strong radiotoxicity into stable or short-lived nuclides by fission reaction
with neutrons. The top candidate for ADS coolant islead bismuth, which is chemically stable and very safe.
However, Japan has no experience with the use of leadbismuth as a nuclear reactor coolant, and the characteristics of the nuclear reaction (nuclear-reaction crosssection) of lead and bismuth have not been sufficiently

verified. Hence, the new experimental data (multiplication factor and lead/void reactivity worth) wereobtained to validate the nuclear-reaction cross sectionof lead in fast neutron systems using a critical assemblyin the United States [1]. In this study, the multiplication
factor (keff) of the experiment was benchmarked [2].
This benchmark provides a reference (Ref ) configuration and three different voided ones (2V, 3V, 4V). In Ref
configuration, the core consists of high-enriched uranium, natural uranium, and lead. In the voided ones,
the amount of lead gradually decreases from 2V to 4V.
Table 1 shows the benchmark keff with evaluated experimental uncertainty Δk.
Table. 1. Benchmark keff
Configuration

Benchmark keff

Ref

1.00269(+0.00075/-0.00113)

2V

1.00302(+0.00078/-0.00113)

3V

1.00334(+0.00079/-0.00117)

4V

1.00359(+0.00080/-0.00116)

The relatively larger uncertainty in the keff arises
from the uncertainty in tolerance of lead material,
thickness of each material, and mass and gap of copper
reflectors.
These measurements were compared with the calculation values using nuclear-reaction cross section
data (nuclear data) developed in Japan (JENDL-4.0) andthe United States (ENDF/B-VIII.0). As shown in Table 2,
the calculation results using ENDF/B-VIII.0 well reproduced the experimental ones, whereas that using
JENDL-4.0 underestimated them outside the range ofexperimental uncertainty (around -115 per cent mille(pcm)).
Table. 2. Resulting (C-E)/E
Configuration(C – E)/E (pcm)
ENDF/B-VIII.0

JENDL-4.0

Ref

-67

-147

2V

-66

-145

3V

-68

-144

4V

-67

-141

Transmutation Studies

J-PARC Annual Report 2021

48
These benchmarks have passed the rigorous examination of the International Handbook of EvaluatedCriticality Safety Benchmark Experiments Project(ICSBEP) belonging to the Nuclear Science Committeeof Nuclear Energy Agency of Organization for Economic
Co-operation and Development (OECD/NEA/NSC) andwill be registered in the 2022 version of ICSBEP.

References[1] M. Fukushima, J. Goda, A. Oizumi et al., Nuclear Science andEngineering, 194(2), pp.138-153 (2020).
[2] A. Oizumi, M. Fukushima, S. Gunji et al., International Handbookof Evaluated Criticality Safety Benchmark Experiments, IEUMET-FAST-025, OECD/NEA/NSC (2022).

International and Domestic Cooperation
In spite of the severe restrictions due to COVID19, we proceeded steadily with the international anddomestic 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. In November 2021, the collaboration arrangement was extended for another five-year period. One of
the three specific topics of cooperation (STC) is for R&D
on ADS. The STC was renewed for the same period. Five
research topics were included in the STC: (1) accelerator
technology for ADS, (2) Nuclear data, high energy physics, subcriticality monitoring and fuel cycle analysis, (3)Materials R&D, (4) LBE coolant chemistry control andpurification and (5) LBE instrumentation for thermalhydraulic analyses.

We continued the collaboration with Karlsruhe
Institute of Technology in Germany on the LBE technology. We are participating with the eighth Spallation
Target Irradiation Program (STIP-8) at Paul Scherrer
Institute in Switzerland, and a proton-beam irradiation
program of steel samples including JAEA’s ones has
been completed.
We are also collaborating with universities in Japan.
One of the collaborations is with the University of Fukui
on behavior of spallation and corrosion products in LBE.
We are developing the Transport of RAdionuclides In
Liquid metal systems (TRAIL) code. We continued theexperimental study on the evaporation behavior of volatile elements from LBE.
Another collaboration is with Tokyo Institute ofTechnology (TIT). Several steel specimens were provided by TIT, and a materials corrosion behavior of these
specimens in the flowing LBE in the OLLOCHI loop wasinvestigated.

SafetySafety

J-PARC Annual Report 2021

50

Safety1. Major events on safety culture and safety activities in J-PARC
Through our experiences of the various accidents
and incidents, J-PARC has reaffirmed that “The safetyof the facility is achieved by the efforts of every person
involved”, and we actively implement safety culture
development activities to upgrade the safety awareness and skills of each person. Our efforts to enforce
the safety culture in J-PARC include sharing safety information, enhancement of safety awareness, educationand training, etc. For these purposes, new approaches
are being introduced sequentially. In addition, these
activities are being reviewed internally and by external
experts to ensure continuous improvement.
In FY2021, we established a safety policy of “riskawareness and sharing risk information”. Specifically,
the following is required: 1) workers should look at
the work site with a fresh perspective, free from biases
caused by experience, and become aware of new risks;
2) workers should communicate the risks to the person in charge, the section leaders, etc.; 3) the person
in charge, section leader, etc., inform newcomers to
J-PARC of the potential risks at the facility. By sharing
and dealing with risks in this way, we aimed to improve
the safety capability of J-PARC.
Table 1 lists the major events on safety culture andsafety activities at J-PARC.
In order not to forget the radioactive material leakincident that occurred on May 23, 2013, the J-PARC
sections exchange safety information with each otherand a workshop for fostering safety culture is held
every year around May 23. The Safety Day in FY2021
was held on May 28 via online meeting. Some goodpractices received awards from the director, and work
management in the Rapid Cycling Synchrotron (RCS)
facility was introduced. Following these programs, themain talk entitled “Assertion culture supporting safety
at the engineering and maintenance department,
ANA” was given by Mr. Satoru Nabeshima, ALL NIPPONAIRWAYS CO., LTD. Further, an updated video materialon the radioactive material leak incident in 2013 waspresented.
The 8th Symposium on Safety in Accelerator
Facilities was held on August 27 via online meeting,and 121 participants exchanged information on safetyissues at accelerator facilities. Six presentations fromaccelerator facilities were made on the recent situationof each facility and safety activities under the novel

coronavirus pandemic. Circumstances and difficulties
concerning the application for a license for the accelerator operation at each facility were also shared.
An emergency drill was conducted on November
21 at RCS in cooperation with the Nuclear Science
Research Institute of the Japan Atomic Energy Agency.
It was assumed that a worker was left in the tunnel of
RCS and exposed to radiation when the beam operation started. The drill included transportation anddecontamination of the exposed worker, an estimationof the exposure doses, setup of the command post andcommunication with the accident site, report to theheadquarters via TV conference, and simulated press
release.
The J-PARC safety audit in fiscal year 2021 was
conducted by two auditors on December 20. They
reviewed the following points: 1) Compliance initiatives, 2) Organization for safety management, and 3)
Safety management in works. The auditors gave us
valuable recommendations, such as ideas for effective improvements of the rad-work permit processes,
scheduling maintenance works with a proper margin,
review and improvement of all activity, including maintenance works.
2. Radiological license update and facility inspection
Applications to update the radiological license
were submitted to the Nuclear Regulation Authority on
February 16, 2022. Table 2 lists the main changes in theapplications. The permit for the applications was issued
on August 24, 2022.
On January 11, 2022, “The new construction plans”
for new and additional facilities for the Materials andLife Science Experimental Facility, Hadron Experimental
Facility, and Neutrino Experimental Facility were submitted to the Ibaraki prefecture for preliminary approvalby the local government in accordance with the Ibaraki
Prefecture Nuclear Safety Agreement.
The facility inspection for the new fast muon experimental facility (H line) and the extension of the slow
muon experimental facility (S line) at the Materials andLife Science Experimental Facility, which was applied
for on October 5, 2020, and approved on June 9, 2021,
was conducted by the Radiation Management ResearchInstitute, Inc., registered inspection agency, on January
25, 2022.

J-PARC Annual Report 2021

Safety51
3. Meeting of the committee on the radiation safety
matter
The J-PARC Radiation Safety Committee is organized as an advisory committee to both JAEA andKEK to discuss policy on radiation safety in J-PARC.
Meanwhile, the Radiation Safety Review Committee has
been established to discuss specific subjects of radiation safety at J-PARC.
In FY2021, the J-PARC Radiation Safety Committee
met twice, and the Radiation Safety Review Committee
met four times. Table 3 lists the major issues tackled by
the committees.

4. Radiation exposure of radiation workers
The number of persons subject to annual measurement of external exposure in FY2021 was 3090.
Table 4 lists the distribution of annual exposed
doses for each category of workers. There was no exposure exceeding the dose limit specified in the local
radiation protection rule for J-PARC and the administrative dose limits (7 mSv/year) specified in the detailed
rule of local radiation protection rule for J-PARC. The
total annual effective dose was 33.9 person·mSv, andthe maximum effective dose was 1.2 mSv.

Table 1. List of major events on safety in FY2021.

Day

EventsMay 28, 2021

Safety Day (Meeting to exchange safety information between each section, Workshop
for fostering safety culture)

July 2, 2021

Liaison committee on safety and health for contractors

August 27, 2021

The 8th Symposium on Safety in Accelerator Facilities

October-December

Refresher course on radiation safety for in-house staff (e-learning)

November 21, 2021

Emergency drill assuming that the beam operation started while a worker was in thetunnel of the Rapid Cycling Synchrotron, , causing massive exposure

December 20, 2022

FY2021 J-PARC Safety Audit

Table 2. Major application items of the radiological license

Facility

Items of an application

Li• Change in the maximum number of accelerated particles• Appropriateness of description

RCS• Change in the maximum number of accelerated particles• Appropriateness of description

MR• Change in the maximum number of accelerated particles• Appropriateness of description

MLF• Installation of the Muon accelerator• Modification of the exhaust purification system (a gas waste treatment facility)• Appropriateness of descriptionHD• Change in the maximum number of accelerated particles• Expansion of the room for radiation generator use (installation of a new primary beamline (C-line))• Modification of the exhaust system, addition of exhaust and drainage facilities• Appropriateness of description

NU• Change in the maximum number of accelerated particles• Addition of entrance for the radiation-controlled area
• Modification of the air exhauster

Safety

J-PARC Annual Report 2021

52
Table 3. Radiation Safety Committee (RSC) and Radiation Safety Review Committee (RSRC) in FY2021

No.

Date

Major Issues

The Radiation Safety Committee
37th
th

38

July 19, 2021

• Change of the plan for radiological license update in FY2021

March 29, 2022

• The plan for radiological license update in FY2022

The Radiation Safety Review Committee
30th

st

31

32nd

rd

33

July 14, 2021

• Installation of an X-ray generator• Revision of the detailed rule of local radiation protection rule for J-PARC• Re-evaluation of radioactivity in cooling water

September 2, 2021

• Next radiological license update

November 8, 2021

• Revision of the accident reporting regulations and the guidelines for accident
countermeasure activities• Revision of J-PARC Center reporting standards• Revision of the operation manual for J-PARC

February 1, 2021

• Partial revision of Rules and Regulations accompanying changes in organizational structure (as of April 1, 2022)

Table 4. Annual exposure doses in FY2021# ofworkers

Dose range x (mSv)
ND

0.1≤ x ≤1.0

1.0< x ≤5.0

5.0< x

Collective dose
(person · mSv)

Maximum dose(mSv)

In-house staff

688

661

27

0

0

8.2

1.0

Users

929

929

0

0

0

0.0

0.0

Contractors

1,481

1,389

91

0

0

25.7

1.2

Total

3,090

2,971

118

0

0

33.9

1.2

*If the same worker changed the worker classification during the fiscal year, the worker was counted as one worker per theclassification. Therefore, the total number does not match the sum of the respective classification.

User Service

User Service

J-PARC Annual Report 2021

54

Users Office (UO)
OutlineUser, 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 training. Since 2015,
UO had been doing its part to improve the J-PARC online experiment system and make it more user-friendly.
After the experiments UO may return the experiment samples at User’s cost after cooling the radioactive activities.

The J-PARC Users Office (UO) was established in2007. In December 2008, it opened an office on the firstfloor of the IBARAKI Quantum Beam Research Center inTokai-mura. UO maintains the Tokai Dormitory for the JPARC Users. UO provides on-site and WEB support with
one-stop service for the utilization of the J-PARC. As of
March 31, 2021, UO had 11 staffs and 5 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 as a J-PARC

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 the J-PARC Users OfficeJ-PARC Annual Report 2021

User Service

55

Activities of the 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 2021

56

User Statistics
Users in 2021 (Japanese ⁄ Foreigners, person-days)
3,000
3000

Foreigners
Japanese

2,500
2500
2,000
2000
1,500
1500
1,000
1000
500
500
00

4
2021

5

6

7

8

9

10

11

12

1
2022

2

3

Users in 2021
(according to facilities, person-days)

Users in 2021
(according to organizations, person-days)

Accelerator
391

Foreign Organizations
1,133
PrivateEnterprises
697

Neutrino
1,591

Other 48

PublicOrganizations
1,398

Hadron4,594

MLF
11,258Japanese
Universities
14,558

HadronMLF

Neutrino

Japanese Universities
Foreign Organizations

Accelerator（人日）

Public Organizations
Other

Private Enterprises

3

2

.1

12

22
20

11

9

10

8

7

6

.4
21
20

22
20

21
20

3

00
2

00
.1

500
500

12

500
500

11

1,000
1000

10

1,000
1000

9

1,500
1500

8

1,500
1500

7

2,000
2000

6

2,000
2000

5

2,500
2500

.4

2,500
2500

5

（人日）

J-PARC Annual Report 2021

User Service

57

MLF Proposals Summary - FY2021
The proposals for 2021A are not included in Table 1. Due to the COVID-19 situation, 2020B and 2021A were combined into one proposal round. The operations period for the proposals for “2020B+2021A” was from December 2020
to July 2021. Therefore, the proposals for 2021A were included in the FY2020 data as they cannot be counted separately.
Table 1. Number of Proposals by Beamline
Beamline

2021B

Submitted Approved Submitted Submitted Approved Approved

Instrument

BL01

4D-Space Access Neutron Spectrometer - 4SEASONS

BL02

Biomolecular Dynamics Spectrometer - DNA

BL03

IBARAKI Biological Crystal Diffractometer - iBIXFull Year(100-β)
(β)

‡

†

GU

GU

PU/S

IU

PU/S

IU

24(0)

8(0)

0

2

0

2

26(2)

7(2)

2

3

2

3

3

3

0

0

0

0

1

1

45 ※

0

44 ※

0

BL04

Accurate Neutron-Nucleus Reaction Measurement Instrument - ANNRI

10

5

2

1

2

1

BL05

Neutron Optics and Physics - NOP

8

6

1

0

1

0

BL06

Village of Neutron Resonance Spin Echo Spectrometers - VIN ROSE

2

2

1

0

1

0

BL08

Super High Resolution Powder Diffractometer - SuperHRPD

9

5

1

0

1

0

BL09

Special Environment Neutron Powder Diffractometer - SPICA

4

4

1

0

1

0

BL10

Neutron Beamline for Observation and Research Use - NOBORU

16

4

2

1

2

1

BL11

High-Pressure Neutron Diffractometer - PLANET

18(0)

7(0)

0

2

0

2

BL12

High Resolution Chopper Spectrometer - HRC

7

4

1

0

1

0

BL14

Cold-Neutron Disk-Chopper Spectrometer - AMATERAS

47

7

1

1

1

1

BL15

Small and Wide Angle Neutron Scattering Instrument - TAIKAN

36(2)

12(2)

2

3

2

3

BL16

Soft Interface Analyzer - SOFIA

17

5

0

1

0

1
3

BL17

Polarized Neutron Reflectometer - SHARAKU

17(2)

10(2)

3

3

3

BL18

Extreme Environment Single Crystal Neutron Diffractometer - SENJU

22(1)

7(1)

1

1

1

1

BL19

Engineering Materials Diffractometer - TAKUMI

27

12

2

1

2

1

BL20

IBARAKI Materials Design Diffractometer iMATERIA(100-β)
(β)

‡

†

8

7

0

0

0

0

22

22

28

0

26

0

BL21

High Intensity Total Diffractometer - NOVA

19

15

1

0

1

0

BL22

Energy Resolved Neutron Imaging System - RADEN

19(2)

8(2)

0

2

0

2

BL23

Polarized Neutron Spectrometer - POLANO

4

4

1

0

1

0

D1

Muon Spectrometer for Materials and Life Science Experiments - D1

21(1)

10(0)

1

1

1

1

D2

Muon Spectrometer for Basic Science Experiments - D2

11(4)

4(2)

1

1

1

1

S1

General purpose µSR spectrometer - ARTEMIS

41(0)

18(0)

1

1

1

1

S2

Muonium Laser Physics Apparatus - S2

0

0

0

1

0

1

U1A

Ultra Slow Muon Microscope - U1A

0

0

0

1

0

1

U1B

Transmission Muon Microscope - U1B

0

0

0

1

0

1

H1

High-intensity Muon Beam for General Use - H1
Total

0

0

0

1

0

1

439

197

89

28

86

28

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%)
‡ : J-PARC Center General Use Beamtime (100-β = 20%)( ) : Number of proposals under the New User Promotion (BL01, BL02, BL11, BL15, BL17, BL18, BL22) or
P-type proposals (D1,D2, S1) in GU※ Operations period is 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 2021

58
Table 2. Number of Long-Term Proposals by Fiscal Year
Fiscal Year

Submitted

Approved

2019

9

4

2020

13

3

2021

0

0

Due to the COVID-19 situation, no Long-Term Proposals were called for FY2021.

Numer of Proposals

1200
1000
800
600

142

400

0

45

20
34
67

214

2008

2009

231

309

255

2010

2011

Not Approved

360

Approved

395
245

126

42

200

293

278

329

199

460

422

2012

2013

469

2014

321
2015

353

2016

507

630

607

626
311

2017

2018

2019

2020

2021

Fiscal Year

Fig. 1. Number of MLF Proposals over Time
After publishing J-PARC Annual Report 2020, additional Fast Track Proposals and Urgent Proposals were approved. Therefore, the number of proposals for FY2020 was changed in Figure 1.

JAEA
42
8%

KEK
36
6%

CROSS
31
6%
Universities (Japan)
Companies (Japan)
Universities (Japan)
230
41%

Research Institutes (Japan)
Foreign Organizations
JAEA

Foreign Organizations
143
26%

KEK
CROSS
Companies (Japan)
49
9%Research Institutes (Japan)
25
4%Fig. 2. Origin of Submitted Proposals by affiliation - FY2021

J-PARC Annual Report 2021

User Service

59

J-PARC PAC Approval Summary for the 2021 Rounds(Co-)
Spokespersons

Affiliation

Approval status(PAC recommendation)

Title of the experiment–Beamline

StatusE03

K.Tanida

JAEA

Measurement of X rays from X Atom

Stage 2

K1.8

P04

J.C.Peng,
S.Sawada

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

DeferredPrimary

E05

T.Nagae

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

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

K1.8

E06

J.Imazato

KEK

Measurement of T-violating Transverse Muon+
0+
Polarization in K -> p m n Decays

E36 as the first step

K1.1BR

E07

K.Imai,K.Nakazawa,
H.Tamura

JAEA, Gifu U,
Tohoku U

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

K1.8

E08

A.Krutenkova ITEP

Pion double charge exchange on oxygen at J-PARC

Stage 1

K1.8

E10

A.Sakaguchi,
T.Fukuda

Stage 2K1.8

E11

A.K.Ichikawa,
KEK
F.Sanchez

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

Stage 2neutrino Data taking

E13

H.TamuraGamma-ray spectroscopy of light hypernuclei

Stage 2

K1.8

Finished

12X

Be, via the

Production of Neutron-Rich Lambda-Hypernuclei with
Osaka U, Osaka
the Double Charge-Exchange Reaction (Revised fromEC U
Initial P10)

Tohoku U

0

Data taking

Finished

Finished
Data analysis

Li run finished, Betarget run with
S-2S

E14

T.Yamanaka

Osaka U

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

Stage 2KL

Data taking

E15

M.Iwasaki,
T.Nagae

RIKEN, Kyoto U

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

Stage 2

K1.8BR

Finished

E16

S.Yokkaichi

RIKEN

Measurements of spectral change of vector mesons in
nucleiStage 2 for Run 0(previously “Electron pair spectrometer at the J-PARC 50GeV PS to explore the chiral symmetry in QCD”)

High p

Data taking

E17

R.Hayano,
H.OutaU Tokyo, RIKEN Precision spectroscopy of Kaonic He 3d->2p X-rays

E18

H.Bhang,
SNU, RIKEN,
H.Outa, H.Park KRISSCoincidence Measurement of the Weak Decay ofand the three-body weak interaction process

E19

M.Naruki

KEKHigh-resolution Search for Q Pentaquark in p p -> K X
Reactions

E21

Y.KunoOsaka U

Phase-I Stage 2
An Experimental Search for μ − e Conversion at a
PAC recommends producing a more
COMET
−16
Sensitivity of 10 with a Slow-Extracted Bunched Beam detailed schedule to ensure a timely
start.

E22

S.Ajimura,
A.Sakaguchi

Osaka U

Exclusive Study on the Lambda-N Weak Interaction in
A=4 Lambda-Hypernuclei

Stage 1

K1.8

T25

S.Mihara

KEK

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

Test Experiment

K1.8BR

E26

K.Ozawa

KEK

Search for w-meson nuclear bound states in the p-+ Z ->(A-1)
n+ w(Z-1) reaction, and for w mass modification in the Stage 1
0
in-medium w->p g decay

E27

T.Nagae

Kyoto U

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

Stage 2

K1.8

E29

H.Ohnishi

RIKEN

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

K1.1

E31

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

K1.8BR

Finished
Data analysis

T32

A.Rubbia

ETH, Zurich

Towards a Long Baseline Neutrino and Nucleon Decay
Experiment with a next-generation 100 kton Liquid
Argon TPC detector at Okinoshima and an intensity
upgraded J-PARC Neutrino beam

Test Experiment

K1.1BR

Finished

P33

H.M.Shimizu

Nagoya U

Measurement of Neutron Electric Dipole Moment

Deferred

Linac

3

+

12
L

C

–

Registered as E62 with an updated
proposal

K1.8BR

Stage 2

K1.8

Stage 2

K1.8–

Finished

Finished

A

–

K1.8

+

FisnishedAUser Service

J-PARC Annual Report 2021

60
(Co-)
Spokespersons

Affiliation

Approval status(PAC recommendation)

Title of the experimentBeamline

Status

E34

T. Mibe

KEK, RIKENAn Experimental Proposal on a New Measurement of theMuon Anomalous Magnetic Moment g-2 and ElectricStage 2
Dipole Moment at J-PARC

E36

M.Kohl,S.Shimizu

Hampton U,
Osaka U

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

K1.1BR

Finished
Data analysis

E40

K.MiwaTohoku U

Measurement of the cross sections of Σp scatterings

Stage 2

K1.8

Finished
Data analysis

P41

M.Aoki

Osaka U

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

Deferred

MLF

Reviewed in MLF/
IMSS

E42

J.K.Ahn

Pusan National Search for H-Dibaryon with a Large Acceptance Hyperon
Stage 2
U
Spectrometer

K1.8

Finished
Data analysis

+

+

+

MLF

+

E45

K.H.Hicks,
H.SakoOhio U, JAEA

3-Body Hadronic Reactions for New Aspects of Baryon
Spectroscopy

Stage 2
PAC requests that the group further
examine ways to reduce the total
K1.8
beam time requested and to find an
efficient running scheme, including
quick but careful beam tuning.

T46

K.Ozawa

KEK

EDIT2013 beam test program

Test Experiment

K1.1BR

Abandonded

T49

T.Maruyama

KEK

Test for 250L Liquid Argon TPC

Test Experiment

K1.1BR

Withdrawn

E50

H.NoumiOsaka U

Charmed Baryon Spectroscopy via the (π, D ) reaction

Stage 1The FIFC, IPNS, and E50 shouldHigh pinvestigate the beam-line feasibility

T51

S.Mihara

KEK

Research Proposal for COMET(E21) Calorimeter
Prototype Beam Test

Test Experiment

K1.1BR

had to be stopped

T52

Y.Sugimoto

KEK

Test of fine pixel CCDs for ILC vertex detector

Test Experiment

K1.1BRnot performed yet

T53

D.Kawama

RIKEN

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

Test Experiment

K1.1BRnot performed yet

T54

K.MiwaTohoku U

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

Test Experiment

K1.1BRnot performed yet

T55

A.Toyoda

KEK

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

Test Experiment

K1.1BR

had to be stopped

E56

T.Maruyama

KEK

A Search for Sterile Neutrino at J-PARC Materials and Life
Stage 2
Science Experimental Facility

MLF

Data taking

E57

J. Zmeskal

Stefan Meyer
Institute forSubatomic
Physics

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

K1.8BRin preparation

P58

M. Yokoyama U. Tokyo

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

neutrino

T59

A. Minamino

Kyoto UA 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

T60

T. Fukuda

Toho U

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

Arranged by IPNS and KEK-T2K

E61

M. Wilking

Stony Brook U

NuPRISM/TITUS

Superseded.
E61 has been adopted in Hyper-K as
neutrino
IWCD.
IWCD is reviewed by HK-PAC.

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

Gamma-ray spectroscopy of light hypernuclei II

Stage 2

K1.1

BL not readyyet. Exp. in
preparation

T64

Y. Koshio

Okayama U

Measurement of the gamma-ray and neutron
background from the T2k neutrino/anti-neutrino at
J-PARC B2 Hall

Arranged by IPNS and KEK-T2K

neutrino*–

Deferredneutrino
monitor Finishedbld

J-PARC Annual Report 2021

User Service

61
(Co-)
Spokespersons

Affiliation

Title of the experiment

Approval status(PAC recommendation)

Beamline

StatusE65

A.K.Ichikawa,
Kyoto U
F.Sanchez

Proposal for T2K Extended Run

Stage-2

neutrino

T66

T. Fukuda

Nagoya U

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

Test Experimentneutrino

P67

I. Meigo

JAEA

Measurement of displacement cross section of proton in
Carry out the experiment within theenergy region between 3 and 30 GeV for high-intensityMRframework of facility development
proton accelerator facility

T68

T. Fukuda

Nagoya U

Extension of T60/T66 Experiment: Proposal for the Run
from 2017 Autumn

E69

A. Minamino

Yokohama
National U

Study of neutrino-nucleus ineraction at around 1GeV
using cuboid lattice neutrino detector, WAGASHI, muon
Superseded. Merged with T2K.
range detectors and magnetized spectrometer, Baby
MIND, at J-PARC neutrino monitor hallneutrino

E70

T. Nagae

Kyoto U

Proposal for the next E05 run with the S-2S spectrometer Stage-2

K1.8

E71

T. Fukuda

Nagoya U

Proposal for precise measurement of neutrinop-watercross-section in NINJA physics run

Stage-2

neutrino Data taking

E72

K. Tanida

JAEA

Search for a Narrow Λ* Resonance using the p(K-, Λ)η
Reaction with the hypTPC Detector

Stage-2

K1.8BR

E73

Yue MaRIKEN

ΛH and ΛH mesonic weak decay lifetime measurement
3,4– 0 3,4
with He(K ,π ) ΛH reaction

PAC suggests Stage-2 approval

K1.8BR

P74

A.Feliciello

INFN, Torino

Direct measurement of the 3ΛH and 4ΛH lifetimes using
Rejectedthe 3,4He(π-,K0)3,4ΛH reactions

K1.1

E75

H.Fujioka

Tokyo Inst.
Tech,

Decay Pion Spectroscopy of 5ΛΛH Produced byΞ-hypernuclear Decay

K1.8

P76

H.M.Shimizu

Nagoya U

Searches for the Breaking of the Time Reversal Invariance
Deferredin Polarized Epithermal Neutron Optics

T77

Yue MaRIKEN

Feasibility study for 3ΛH mesonic weak decay lifetime
measurementwith 3,4He(K-,π0)3,4ΛH reaction

PAC supoorts the ontinuation of T77
by an explorative run with the 3He K1.8BR
target.

Finished Data
analysis

T78

H.Nishiguchi

KEK

8GeV Operation Test and Extinction Measurement

Test Experiment

K1.8BR

Finished

E79

T.Ishikawa

Tohoku U

Search for an I=3 dibaryon resonanceStage-1

High p

E80

F.Sakuma

RIKEN

Systematic investgatin of the light kaonic nuclei

Stage-1

K1.8BR

T81

T.Fukuda

Nagoya U

Proposal of test experiment for technical improvementsof neutrino measurements with nuclear emulsion
Test Experimentdetectorneutrino

E82

T.Maruyama

KEK

JSNS2-II

PAC suggests Stage-2 approval

MLF

E83

J. H. Yoo

Korea U

Search for sub-millicharged particles at J-PARC

PAC suggests stage-1 status.

neutrino

E88

H. Sako

JAEA

Study of in-medium modification of phi mesons inside+ –the nucleus with phi->K K measurement with the E16
spectrometer

PAC suggests stage-1 status.

high-p

P89

T. Yamaga

RIKEN

Deferred.
Investigation of fundamental properties of the KNN state PAC would like to see the detailed
feasibility of P89 after E80's TDR.

K1.8BR

E90

Y.Ichikawa,
K.Tanida

JAEA

High resolution spectroscopy of the “ΣN cusp” by using––
the d(K , π ) reaction

K1.8

P91

Y.Morino

KEK

Proposal for study of charm component in the nucleon
Deferred.
via J/ψ measurement with the J-PARC E16 spectrometer

F.Sakuma

RIKEN

Deferred.
PAC recommends that the
Proposal for the E80 Phase-I Experiment:Investigation of proponents should carefully analyze
K1.8BR
the KNNN ¯ Bound State Focusing on the Λd Decay
the T77 data and seek further
justification for the K-NNN boundstate interpretation.

K.Shirotori

Deferred.
PAC requests that the beamline
Proposal of test experiment to evaluate performances
modification part of the proposal
Osaka U (RCNP) of secondary beam mode at the high-momentum beam be discussed with the Lab/Facility
high-pline
management. PAC also recommends
the proponents make specificproposals.

3

P92

P93

Test Experimentneutrino

4

PAC suggests Stage-2 approval

PAC suggests stage-1 status.

MLF

high-pOrganization and Committees

Organization and Committees

J-PARC Annual Report 2021

64

Organization Structure
J-PARC Center Management System Chart
as of April 1, 2021

Deputy Director(Safety)

Y. Miyamoto

Safety Division
Y. Nakane - K. Bessho,

Radiation Control Section
K. Seki - M. Numajiri , K. Seki
Safety Promotion Section
Y. Kasugai - T. Itoh

H. Oguri

K. Yamamoto - M. Yamamoto

Accelerator Division
M. Kinsho - H. Oguri, T. Toyama

N. Hayashi - J. Kamiya
S. Igarashi - Y. SatoT. Toyama - E. Yanaoka
H. Hotchi - K. Nanmo

Director

K. Haga - K. Sakai

T. Kobayashi
Deputy Director(JAEA)

S. Wakimoto

Y. Kawakita - T. Yokoo, M. Nakamura

Materials & Life Science Division
T. Otomo - K. Soyama, K. Aizawa
K. Simomura

T. Nakamura
R. Kadono - N. Kawamura
T. OkuDeputy Director(KEK)

F. Naito

T. Nakadaira

T. Komatsubara - S. Sawada, Y. Fujii

Nuclear Transmutation Division

F. Maekawa - S. Meigo

S. Sawada

T. Sasa
S. Meigo

Y. Makita - K. Sasaki

K. Gorai - J. Suzuki

H. TakadaJ. Sekita

Y. Yamazaki - Y. Miyamoto - K. Suganuma
T. Shibahara - H. Tonooka, S. Takasaki

Y. Fukuta - T. Shibahara

S. Waku
Users Oﬃce

M. Tsukada

J-PARC Annual Report 2021

Organization and Committees

65

Members of the Committees Organized for J-PARC(as of March, 2020)
1) Steering Committee (*) Chair

Junji Haba (*)

High Energy Accelerator Research Organization (KEK), Japan

Koki Uchimaru

High Energy Accelerator Research Organization (KEK), Japan

Naohito Saito

High Energy Accelerator Research Organization (KEK), Japan

Nobuhiro Kosugi

High Energy Accelerator Research Organization (KEK), Japan

Tadashi Koseki

High Energy Accelerator Research Organization (KEK), Japan

Hiroyuki Oigawa (*)

Japan Atomic Energy Agency (JAEA), Japan

Kenji Sudo

Japan Atomic Energy Agency (JAEA), Japan

Masayasu Takeda

Japan Atomic Energy Agency (JAEA), Japan

Toshiyuki Momma

Japan Atomic Energy Agency (JAEA), Japan

Akira Endo

Japan Atomic Energy Agency (JAEA), Japan

Takashi Kobayashi

J-PARC Center, Japan

2) International Advisory Committee

(*) ChairThomas Prokscha

Paul Scherrer Institute (PSI), Switzerland

Yoko Sugawara

Toyota Physical and Chemical Research Institute, Japan

Paul Langan

Institut Laue-Langevin, France

Takeshi Egami

University of Tennessee, USA

Dan Alan Neumann

National Institute of Standards and Technology, USA

Robert McGreevy (*)

Science & Technology Facilities Council (STFC), UK

Jie Wei

Michigan State University, USA

John Thomason

Science & Technology Facilities Council (STFC), UK

Joachim Mnich

The European Organization for Nuclear Research(CERN), Switzerland

Dmitri Denisov

Brookhaven National Laboratory, USA

Angela Bracco

INFN, Istituto Nazionale di Fisica Nucleare, Italy

Reiner Kruecken

TRIUMF, Canada

Hamid Aït Abderrahim

Belgian Nuclear Research Centre (SCK CEN), Belgium

Akira Hasegawa

Tohoku University, Japan

Shinichi Kamei

Mitsubishi Research Institute, Japan

Hiromi Yokoyama

The University of Tokyo, Japan

Organization and Committees

J-PARC Annual Report 2021

66
3) User Consultative Committee for J-PARC
Masaki Ishitsuka

Tokyo University of Science, Japan

Hajime Nanjo

Osaka University, Japan

Shoji Asai

The University of Tokyo, Japan

Takeshi Komatsubara

High Energy Accelerator Research Organization (KEK), Japan

Satoshi Nakanura

Tohoku University, Japan

Tomofumi Nagae

Kyoto University, Japan

Fuminori Sakuma

RIKEN, Japan

Shinya Sawada

High Energy Accelerator Research Organization (KEK), Japan

Kouji Miwa

Tohoku University, Japan

Hiroyuki Kimura

Tohoku University, Japan

Toshio Yamaguchi (*)

Fukuoka University, Japan

Takashi Kamiyama

Hokkaido University, Japan

Takatsugu Masuda

The University of Tokyo, Japan

Kazuhisa Kakurai

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

Toshiya Otomo

High Energy Accelerator Research Organization (KEK), Japan

Kenya Kubo

International Christian University, Japan

Tadashi Adachi

Sophia University, Japan

Koichiro Shimomura

High Energy Accelerator Research Organization (KEK), Japan

Yuko Kojima

Mitsubishi Chemical Corporation, Japan

Hiroyuki Kishimoto

Sumitomo Rubber Industries, Ltd. Japan

Hideto Imai

Nissan Analysis and Research Center, Japan

Masahiro Hino

Kyoto University, Japan

Hironori Kodama

Ibaraki Prefecture, Japan

Satoru Yamashita

The University of Tokyo, Japan

Cheol-Ho Pyeon

Kyoto University, Japan

Kazufumi Tsujimoto

Japan Atomic Energy Agency (JAEA), Japan

4) Accelerator Technical Advisory Committee

(*) Chair(*) Chair

Wolfram Fischer

Brookhaven National Laboratory (BNL), USA

Mats Lindroos

European Spallation Source, ERIC, Sweden

John Thomason

Science and Technology Facilities Council (STFC), UK

Sheng Wang

Institute of High Energy Physics, CAS, China

Toshiyuki Shirai

National Institutes for Quantum and Radiological Science and Technology, Japan

Alexander Aleksandrov

Oak Ridge National Laboratory, USA

Jie Wei (*)

Michigan State University., USA

Robert Zwaska

Fermi National Accelerator Laboratory (FNAL), USA

Simone Gilardoni

European Organization for Nuclear Research (CERN), Switzerland

J-PARC Annual Report 2021

Organization and Committees

675) Neutron Advisory Committee

(*) ChairPhillip King

Rutherford Appleton Laboratory, UK

Bertrand Blau

Paul Scherrer Institut (PSI), Switzerland

Michael J Dayton

Oak Ridge National Laboratory (ORNL), USA

Guenter Muhrer

European Spallation Source(ESS), Sweden

Christiane Alba-Simionesco

Laboratoire Leon Brilloin (LLB) Sacley, France

Jamie Schulz (*)

Australian Nuclear Science and Technology Organization(ANSTO), Australia

Jon Taylor

European Spallation Source(ESS), Sweden

Sungil Park

Korea Atomic Energy Research Institute(KAERI), Korea

Yoshie Ohtake

RIKEN, Japan

Takahisa Arima

The University of Tokyo, JapanKen Anderson

Oak Ridge National Laboratory (ORNL), USA

Toyohiko Kinoshita

Japan Synchrotron Radiation Research Institute(JASRI), Japan6) Muon Advisory Committee

(*) Chair

Martin Månsson

KTH Royal Institute of Technology, Sweden

Thomas Prokscha (*)

Paul Scherrer Institut (PSI), Switzerland

Andrew MacFarlane

University of British Columbia, Canada

Klaus Kirch

ETH Zurich and Paul Scherrer Institute (PSI), Switzerland

Kenya Kubo

International Chiristian University, Japan

Tadayuki Takahashi

University of Tokyo, Japan

Nori AOI

Osaka University, Japan

Hiroshi Amitsuka

Hokkaido University, Japan

7) Radiation Safety Committee

(*) Chair

Yoshitomo Uwamino (*)

Japan Radioisotope Association, Japan

Yoshihiro Asano

High Energy Accelerator Research Organization (KEK), Japan

Hiroshi Watabe

Tohoku University, Japan

Takeshi Iimoto

University of Tokyo, Japan

Takeshi Murakami

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

Yukinori Kobayashi

High Energy Accelerator Research Organization (KEK), Japan

Toshiya Sanami

High Energy Accelerator Research Organization (KEK), Japan

Yoshihito Namito

High Energy Accelerator Research Organization (KEK), Japan

Akira Endo

Japan Atomic Energy Agency (JAEA), Japan

Takumi Nemoto

Japan Atomic Energy Agency (JAEA), Japan

Nobuyuki Kinouchi

Japan Atomic Energy Agency (JAEA), Japan

Organization and Committees

J-PARC Annual Report 2021

688) Radiation Safety Review Committee

(*) Chair

Yukihiro Miyamoto (*)

Japan Atomic Energy Agency (JAEA), Japan

Yoshihiro Nakane

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

Koji Kiriyama

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

Kaiichi Haga

High Energy Accelerator Researchi Organization (KEK), Japan

Kazuyoshi MasumotoHigh Energy Accelerator Researchi Organization (KEK), Japan

Michikazu Kinsho

Japan Atomic Energy Agency (JAEA), Japan

Yoshiaki Fujii

High Energy Accelerator Researchi Organization (KEK), Japan

Takeshi Komatsubara

High Energy Accelerator Researchi Organization (KEK), Japan

Kazuya Aizawa

Japan Atomic Energy Agency (JAEA), Japan

9) MLF Advisory Board(*) Chair

Takahisa Arima (*)

The University of Tokyo, Japan

Taku Sato

Tohoku University, Japan

Osamu Yamamuro

The University of Tokyo, Japan

Takashi Kamiyama

Hokkaido University, Japan

Yoshiharu Sakurai

Japan Synchrotron Radiation Research Institute(JASRI), Japan

Hiroshi Amitsuka

Hokkaido University, Japan

Yoko Sugawara

Toyota Physical and Chemical Research Institute, Japan

Tadashi Adachi

Sophia University, Japan

Hiroyuki Kishimoto

Sumitomo Rubber Industries, Japan

Yoshie Otake

RIKEN, Japan

Jun Takahara

Kyusyu University, Japan

Masahiro Hino

Kyoto University, Japan

Yasuhiro Iye

Chubu University, Japan

Toshiya Otomo

High Energy Accelerator Research Organization (KEK), Japan

Kazuhiko Soyama

Japan Atomic Energy Agency (JAEA), Japan

Kazuya Aizawa

Japan Atomic Energy Agency (JAEA), Japan

Koichiro Shimomura

High Energy Accelerator Research Organization (KEK), Japan

Yukinobu Kawakita

Japan Atomic Energy Agency (JAEA), Japan

Ryosuke KadonoHigh Energy Accelerator Research Organization (KEK), Japan

Shinichi Itoh

High Energy Accelerator Research Organization (KEK), Japan

Masayasu Takeda

Japan Atomic Energy Agency (JAEA), Japan

Kenji Nakajima

Japan Atomic Energy Agency (JAEA), Japan

Jun-Ichi Suzuki

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

J-PARC Annual Report 2021

Organization and Committees

6910) Program Advisory Committee (PAC) for Nuclear and Particle Physics Experiments at the J-PARC 50Gev Proton
Synchrotron(*) Chair
Ichiro AdachiHigh Energy Accelerator Research Organization (KEK), Japan

Motoi Endo

High Energy Accelerator Research Organization (KEK), Japan

Yoshitaka Itow

Nagoya University, Japan

Takahiro Kawabata

Osaka University, Japan

Hiroaki OhnishiTohoku University, Japan

Akira Ohnishi

Kyoto University, Japan

Kohei Yorita

Waseda University, Japan

Patrick Achenbach

Mainz University, Germany

Monika Blanke

Karlsruhe Institute of Technology, Germany

Laura Fields

Fermi National Accelerator Laboratory (FNAL), USA

David Jaffe

Brookhaven National Laboratory (BNL), USA

Francois Le Diberder

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

Kam-Biu Luk

University of California at Berkley, USA

Anthony William Thomas

University of Adelaide, Australia

Nu Xu

Lawrence Berkeley National Laboratory, USA

Rikutaro Yoshida (*)

Argonne National Laboratory, USA

11) TEF Technical Advisory Committee

(*) ChairMarc Schyns (*)

Belgian Nuclear Research Center(SCK • CEN), Belgium

Michael Butzek

Forschungszentrum Jülich, Germany

Thierry Stora

European Organization for Nuclear Research (CERN), Switzerland

Yukinobu Watanabe

Kyushu University, Japan

Kazuo Hasegawa

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

Georg Müller

Karlsruhe Institute of Technology, Germany

Kei ItoKyoto University, Japan

Main Parameters

Main Parameters

J-PARC Annual Report 2021

72
Present main parameters of Accelerator
Linac
Accelerated Particles
Negative hydrogen
Energy400 MeVPeak Current
50 mA
0.385 ms for MLF
0.50 ms for MR-FX
0.20 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
91096

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Events

EventsJ-PARC Hello Science Class at After-SchoolClub
On April 2, at the Okusu Funaba School Children’s
Club in Tokai Village, a spring holiday handicraft experi-

ment class was held on the theme of tops. In the class,participants used a compass to observe the line of magnetic force of each disc magnet and an electromagnet
and tops to carry out a precession experiment.

Students listen to the lecturer carefully.

The experiment with a top is so much fun!

Events

J-PARC Annual Report 2021

74

First Media Salon, J-PARC Media Seminar
Held: “A full explanation of the latest news
on the muon g-2 experiment. Will new
physics be discovered beyond the standard model?!”On April 7, Fermi National Accelerator Laboratory(Fermilab) in the U.S. announced results for the measurement of anomalous magnetic moment (g-2) ofmuon. The seminar explains an overview of the plannedexperiment at J-PARC with international collaboration, differences between the Fermilab experimentand the J-PARC experiment, and other related topics.
A high level of interest was evident as there were 22
media participants from 9 companies. Prof. Mibe, a staff
member of the J-PARC center, and associate professor

Ass.Prof. Mibein KEK*explained the new Muon g-2 experiment to be
conducted at J-PARC. Prof. Shimomura, deputy division
head of MLF, and professor in KEK explained researchaiming to improve the accuracy of g-2 determinationby using muonium.
* Professor since June 1, 2021.

J-PARC Safety Day
At the J-PARC Center, we learned a lesson from theradioactive material leak incident which occurred in
May 2013, and we have established a Safety Day in May
of each year to give everyone a chance to think about
safety.
Safety Day for FY2021 was held in a remote live format on May 28, with 310 participants. After commending examples of good practice in FY2020, Dr. Norio Tani
of Accelerator Section II gave a presentation on “WorkManagement at the RCS Facility.”
Next, there was a talk by Mr. Satoru Nabeshimafrom the Engineering & Maintenance Center of All Nippon Airways Co., Ltd.(ANA) entitled “Assertion Culture
Supporting Safety in the Maintenance Departments of
the ANA Group.”“Accelerators” Exhibition at National Museum of Nature and Science from July 13
to October 3
In this event, we introduced the history and development of accelerators in Japan, the basis of accelerators and state-of-the-art research on the universe, as
well as research results used in familiar places.
On July 24, we held a lecture titled “A tool for chasing dreams: accelerators” by Hitoshi Murayama, the
MacAdams Professor of the University of California,
Berkeley, and Professor of the Kavli Institute for the
Physics and Mathematics of the Universe at the University of Tokyo Institutes for Advanced Study.

Prof. Shimomura

The room in J-PARC for broadcasting the online seminar

Exhibition siteJ-PARC Annual Report 2021

Events75

Professor Murayama

Online press conference takes place tostart sample analysis of asteroid Ryugu on
June 25
The conference was broadcast from the Photon
Factory (PF) at KEK Tsukuba Campus and the Muon
Experimental Facility at J-PARC’s Materials and Life Science Experimental Facility (MLF). Professor Tomoki Nakamura of Tohoku University, the leader of the Stone
Material Analysis Team, operated a Gandolphy X-ray
camera that analyzes Ryugu samples using the PF’s synchrotron radiation BL-3A. Professor Yoshio Takahashi of
the University of Tokyo used the PF’s BL-19A and Associate Professor Kazuhiko Ninomiya of Osaka University
used the MLF’s Muon D2 to explain the characteristics
of each beam line, experimental methods for samples,or expected analysis results.
From June 28 to July 5, samples of asteroid Ryugu
were brought to the Muon Experimental Facility, irradiated with high-intensity negative muons, and analyzed
as planned.

various fields such as science, art, culture, and business,to think together, and to hold discussions. This time,
three J-PARC researchers gave lectures on YouTube Live
under the theme of “Life planning for junior and seniorhigh school students: living as a researcher” for one
hour each on Saturday for three weeks.
The first lecture was “Explore the mystery of theuniverse at J-PARC” by Takashi Kobayashi, Director of
the J-PARC Center, the second one was “How to create
the strongest beam!” by Yoshinori Kurimoto, Associate
Professor at High Energy Accelerator Research Organization, J-PARC Center’s Accelerator Division, and thethird one was “How I became a corporate researcher
working at J-PARC” by Izumi Umegaki, a researcher inMaterials Analysis and Evaluation Research Domain at
Toyota Central R&D Labs., Inc.

Workshop “Let's Make Top that Spins
While Tilted!” at Tokai Village Enjoy Summer School 2021
At the Enjoy Summer School event organized by
Tokai Village every year, J-PARC held a workshop on
making tops. Participants were 5th and 6th graders inelementary school, and workshops were held at the
Shirakata Community Center on August 2, Tokai Village
Library on August 6, and online on August 24 due tothe declaration of a state of emergency in Ibaraki Prefecture.

Debriefing session on industrial use of JPARC MLF from July 15 to 16
It has been jointly hosted by four parties, the J-PARC
Center, CROSS, Ibaraki Prefecture, and the Industrial Users Society for Neutron Application every year since2017. The reporting meeting last year was canceled due
to COVID-19. However, this year, 352 people participated in the online meeting. There was a strong requestfrom the industry sector to know what neutrons andmuons can tell us and how they can be used.

Three J-PARC researchers gave online lectures at Spring X Super School, hosted by
KNOWLEDGE CAPITAL on July 3, 10, 17
KNOWLEDGE CAPITAL hosts Spring X Super School
as a place to learn “real knowledge” from specialists in

Prof. Mibe from J-PARC, giving a lecture on August 2

Participation in Online Craft Workshop“Let's Make Polarized Kaleidoscope” forKids Kasumigaseki Open Day
The Kids Kasumigaseki Open Day is an activity
jointly organized by government offices, ministries, andagencies located in the Kasumigaseki district. This year,
the event was mainly held online on August 18 and 19,
and elementary school students who gathered at the

Events

J-PARC Annual Report 2021

76
booth of the Japan Atomic Energy Agency (JAEA) in
the Ministry of Education, Culture, Sports, Science andTechnology received an online explanation from thestaff at the J-PARC Research Building and learned theprinciple of polarization by making a polarized kaleidoscope.

JAEA booth at Kasumigaseki

1st J-PARC Lecture Presentation

5th Symposium Integration of Arts andSciences, Using Quantum Beams Held on
September 9 and 10
To promote research combining humanities andscience, the Institute of Materials Structure Science ofthe High-Energy Accelerator Research Organization(KEK) holds symposiums to bring humanities and science together. This symposium has been held since thefiscal year 2019, and the 5th symposium entitled “Integration of arts and sciences, using Quantum beams”,
was held online.
At this symposium, participants included researchers specializing in quantum beams, scientific researchers in the areas of archaeology and cultural properties
from universities, museums, and other institutions withan interest in the non-destructive analysis, as well as
ordinary people. There were 82 registered participants
and 14 oral presentations. A variety of analyzed objects
were presented including rocks from the asteroid Ryugu, earthenware, stone implements, bronze artifacts,
DNA, glue ink, pictures, and Japanese swords.

J-PARC Center has held lecture presentations to
help more people understand our latest experiments
and research results. The first lecture was held online
with the title “A Gift from Space: Uncovering the Origins
of Life with Muons” on August 25. It discussed the analysis, conducted with negative muon beams produced
at J-PARC from June 28 to July 3, of samples from theasteroid Ryugu brought back by the asteroid explorer
Hayabusa 2.

Formation of a Collaborative Alliance ofIndustrial-Academic Facilities Active at
Multiple Quantum Beam Facilities: Aiming to Develop Quantum Beam Users in
Industry and Maximize the Results of Industrial Use
Academic researchers primarily from Kyoto University, 16 companies in the polymer, soft matter, andother industries, and three large quantum beam facilities (SPring-8, JRR-3, and J-PARC) joined together on
September 30 to form an industry-academia-facility
organization called the “Quantum Beam Analysis Alliance” (Representative: Mikihito Takenaka, Professor, Institute for Chemical Research, Kyoto University). In Juneof this year, joint experiments and technical training on
neutron reflectivity measurement were carried out at
the MLF, and there were activities aimed at helping participating corporate members master techniques using
quantum beams.

Participants of the symposium

J-PARC Open House 2021 Held Online on
November 13
This year's J-PARC open house was held online, likethe last year. There was a live video from the MLF Experimental Hall, nuclear transmutation research facility, MR Accelerator, Hadron Hall, and Neutrino Monitor
Building. In addition to talks by researchers, the content
included an interior video of accelerators that is not normally shown to the public. Live streaming was achieved
through a team effort by about 50 staff members.
Following the keynote address “Exploring the Mysteries of Elementary Particles and the Universe with
Neutrinos” by Professor Atsuko Ichikawa of Tohoku University, a representative of the T2K Experiment Group,
there was a feature called “Ask Questions of Researchers Active on the World Stage!” Participants were limited to Japanese college of technology and high school

J-PARC Annual Report 2021

Events77
students who applied from all over Japan. They participated online, and the question-and-answer session ran
over the scheduled time.

prizes, and six runners-up were selected. Two external
judges also helped to select them. The award ceremony
was held on November 11, and the J-PARC Center Director Takashi Kobayashi handed each award winner acertificate and a gift. The first prize was awarded to thework “Can You Stand the Heat?” by Harjo Stefanus, Principal Researcher, of the Neutron Use Section.

J-PARC staff at the end of the streaming

Exhibition at JASIS 2021 in Makuhari
Messe International Exhibition Hall on November 8 – 10
JASIS, organized by the Japan Analytical Instruments Manufacturers' Association and the Japan Scientific Instruments Association, is one of the largest
exhibitions in Asia of cutting-edge scientific and analysis systems.
Results using the MLF and JRR-3 were presented,
as well as information on the portal site for the usageof the facility.
Over three days, there were about 730 visitors tothese JAEA booths, and there was an active exchangeof questions.

Grand Prize “Can You Stand the Heat?” by Harjo Stefanus

Tour of J-PARC for Ibaraki University, KEK
Day on December 27
Twenty students from Ibaraki University's College of Science, College of Engineering, and Graduate
School of Science and Engineering visited and toured
J-PARC as part of “Ibaraki University, KEK Day”, a tour
focusing on quantum beam science using state-of-theart accelerators.
Participants were divided into two groups andtoured the Klystron Gallery in the LINAC Building, theMLF, the Hadron Experimental Facility, and the Neutrino
Experimental Facility.

Fun Science Class for Parents and Children
Held at the Hitachi Civic Center

At JAEA booth2021 J-PARC Photo Contest
The J-PARC Photo Contest was held this year for the
8th time. We had a total of 21 artworks submitted by 13
people who are involved with the operation of J-PARC
and J-PARC users. One grand prize, two outstanding

At the Hitachi Civic Center, a fun science class forparents and children was held on December 12 withthe title “What is an Elementary Particle? - A Fascinating
Tiny World -” By using tops, elementary school students
and their parents learned together about the properties of elementary particles.
Eight groups of parents and children participatedin the morning session, and seven groups in the afternoon session.

J-PARC Hello Science “Muon H Line FinallyStarts Operation”
Hello Science for December was also held at the
Ibaraki Quantum Beam Research Center (IQBRC) as well

Events

J-PARC Annual Report 2021

78
as online on December 24. Dr. Takayuki Yamazaki of theMaterials and Life Science Division spoke about the
Muon H Line.
The H line is a new member of the muon beam line
at the MLF of J-PARC that will be added starting thisyear. The H line will enable high-intensity productionof both positive and negative muons, and the beamline
will have variable beam energy for outstanding generalversatility.
Furthermore, in the future the H line will be extended, one more experimental area will be constructed,
and a high-brightness muon beam will be produced.
Experiments are being planned, including a muon g-2/
EDM experiment and a transmission muon microscope.

16th Tokai Forum: From Tokai Region to
the Future – Frontline Research and Decommissioning Technology on February
28
The Tokai Forum is a conference to report on thelatest results of research conducted at the Nuclear Fuel
Cycle Engineering Laboratories, Nuclear Science Research Institute, and J-PARC Center to facilitate a better understanding of the activities of the Japan Atomic
Energy Agency (JAEA). Subsequent to the last year, recorded videos were released this year.
From J-PARC, Director Takashi Kobayashi described
the structure and characteristics of three accelerators
at J-PARC, and talked about research results of theMaterials and Life Science Experimental Facility (MLF),
including improved performance of lithium-ion rechargeable batteries, nondestructive analysis of Ogata
Koan's sealed medicine and samples of asteroid Ryugu
returned by Hayabusa 2, commencement of researchfor sterile neutrinos, experiment to create a state similar to a neutron star, and advancement of T2K experiment for neutrinos. Then, Assistant Principal Researcher
Hiroyuki Kogawa of the Neutron Source Section gavea presentation titled “Development of Damage Suppression Technology on the Mercury Target Vessel at JPARC,” detailing the development process of a mercury
target that stably supplies neutrons with the world’s
highest intensity, where the damage of the vessel thatis caused by impact pressure generated in mercury due
to incidental proton beams is suppressed by injecting
cushioning microbubbles into the mercury.

The International Advisory Committee(IAC), Holds International Advisory Committee Meetings
A series of international advisory committee meetings was held, in which J-PARC received advice on its
activities and plans from experts inside and outside Japan. Meetings of the four committees for Transmutation
Experimental Facility (TEF) Technical Advisory Committee (T-TAC), Muon Advisory Committee (MAC), Neutron
Advisory Committee (NAC), and Accelerator TechnicalAdvisory Committee (A-TAC) were held from February 2
to 21,2022, and the International Advisory Council (IAC)
meeting, including reports from these four meetings,
was held on March 3 and 4, 2022. At the IAC meeting,
J-PARC made a report on its overall response to the advice received at the previous meetings, and the committee members gave high praise and new advice on
J-PARC’s wide-ranging activities. This year, two committee members in the disciplines of humanities and social
sciences joined the IAC meeting, and they recognizedthat J-PARC’s public relations activities and communications were at a very high level and greatly helping in improving people’s awareness of its social contributions.

The members of the committee attending IAC online

Held 2nd J-PARC Online Lecture Presentation and J-PARC Hello Science
On March 25, the 2nd Online Lecture Presentation“Diverse Types of Matter in the Universe Created by Elementary Particles called Quarks —J-PARC Tackles the
Challenge of Elucidation,” and the J-PARC Hello Science
Event “Do Hypernuclei Exist in the Universe?” were held,with lectures by Hirokazu Tamura, Professor at Tohoku
University. As part of the lecture presentation, there
was also a detailed presentation on experiments conducted at J-PARC by Shinya Sawada, Deputy Division
Head of the Particle & Nuclear Physics Division.
Atomic nuclei, at the center of the atoms which

J-PARC Annual Report 2021

Events79
comprise matter, are made up of protons and neutrons
in all objects on earth, and those protons and neutrons
consist of up and down quarks, the two lightest quarks
among the six types of quarks. In space, on the other
hand, it has been found that the strange quark, the next
heaviest quark after the up and down quarks, plays acrucial role. Red supergiant stars are formed at the end
stage of stellar evolution. Before long, they cause a supernova explosion, and the star's remains become ablack hole or neutron star. A neutron star is the densest object in the universe, with a radius of about 10–15
km, and a mass 1–2 times that of the sun. The part near
the surface is made of neutrons, but the core part isthought to be an unknown material containing strange

quarks. At the J-PARC Hadron Experimental Facility, research is being done to create a “mini neutron star” onearth and explore its properties in order to elucidate
this unknown type of matter.

Visitors
Due to the measure of prevention against COVID-19,
we could not have the usual number of visitors.
75 Attendees of “Summer Challenge 2021” from various
universities as online visitors (August 18)
Hideo Yura, Director-General of the Reconstruction
Agency (October 1)

There were 473 visitors to J-PARC for the period from April 2021 to the end of March 2022.
International
visitors
1.9%
Media
0.4%
ln-house
18.4%

Public Officers
13.1%
Business
16.7%

University students,
experts
49.5%

Publications

Publications

J-PARC Annual Report 2021

82

Publications in Periodical Journals
A-001
H. Hotchi
High-power proton accelerators for pulsed
spallation neutron sources
AAPPS Bull. 31, 32 (2021)
A-002
W. Saito, et al.
Chemical-Pressure-Induced Point Defects
Enable Low Thermal Conductivity for Mg2Sn
and Mg2Si Single Crystals
ACS Appl. Energy Mater., 4
A-003
S. Uenuma, et al.
Polymer Brush Formation Assisted by
Hierarchical Self-Assembly of Topological
Supramolecule
ACS Appl. Mater. Interfaces, 13
A-004
M. Harada, et al.
Distinguishing adsorbed and depositedionomers in the catalyst layer of polymer
electrolyte fuel cells using contrast variation
small-angle neutron scattering
ACS Omega, 6
A-005
K. Chino
Multinetwork Elastomer Using CovalentBond, Hydrogen Bond, and Clay Plane BondACS Omega, 6
A-006
K. Nakashima, et al.
Stabilization of Size-Controlled BaTiO3
Nanocubes via Precise Solvothermal Crystal
Growth and Their Anomalous Surface
Compositional Reconstruction
ACS Omega, 6
A-007
Q. Li, et al.
In-plane low thermal expansion of NiTi via
controlled cross rolling
Acta Materialia, 204
A-008
M. M. Nygard, et al.
The average and local structure of
TiVCrNbDx (x = 0, 2.2, 8) from total scatteringand neutron spectroscopy
Acta Materialia, 205
A-009
Q. Li, et al.
Tailoring thermal expansion of shapememory alloys through designed
reorientation deformation
Acta Materialia, 218
A-010
M. Naeem, et al.

Temperature-dependent hardening
contributions in CrFeCoNi high-entropy alloy
Acta Materialia, 221

adsorption and controlling the stability ofcomplexes
Appl. Phys. Lett., 118

A-011
M. Busi, et al.
Nondestructive characterization of laser
powder bed fusion parts with neutron Bragg
edge imaging
Additive Manufacturing, 39

A-020
P. Wu, et al.
Evidence of Spin Reorientation andAnharmonicity in Kagome Ferromagnet
Fe3Sn2
Appl. Phys. Lett., 119

A-012
A. S. Tremsin, et al.
Monitoring residual strain relaxation andpreferred grain orientation of additively
manufactured Inconel 625 by in-situ neutron
imaging
Additive Manufacturing, 46

A-021
M. Naeem, et al.
Martensitic transformation in CrCoNi
medium-entropy alloy at cryogenic
temperatureAppl. Phys. Lett., 119

A-013
C. J. Brett, et al.
Humidity-induced Nanoscale Restructuringin PEDOT:PSS and Cellulose reinforced Biobased Organic Electronics
Adv. Electron. Mater., 7
A-014
M. Kawasaki, et al.
In-situ heating neutron- and X-ray diffraction
analyses for revealing structural evolution
during post-printing treatments of additivemanufactured 316L stainless steel
Adv. Eng. Mater.
A-015
N. Hisano, et al.
Elastic properties and structures of pyrope
glass under high pressures
American Mineralogist, 106
A-016
R.U. Abbasi, et al.
The Cosmic-Ray Composition between 2 PeV
and 2 EeV Observed with the TALE Detector
in Monocular Mode
ApJ 909, 178 (2021)
A-017
K. Abe, et al.
Supernova Model Discrimination with
Hyper-Kamiokande
ApJ 916, 15 (2021)
A-018
Y. Oyama
Re-examination of the Time Structureof the SN1987A Neutrino Burst Data in
Kamiokande-II
ApJ 922, 223 (2021)
A-019
S. Kumar, et al.
Modifications in the nanoparticle-protein
interactions for tuning the protein

A-022
K. Ikeda, et al.
Generating Mechanism of Catalytic Effect for
Hydrogen Absorption/Desorption Reactions
in NaAlH4–TiCl3
Appl. Sci., 11
A-023
R. Aggarwal, et al.
An Investigation of Radial Basis Function
Method for Strain Reconstruction by EnergyResolved Neutron Imaging
Appl. Sci., 11(1)A-024
K. Abe, et al.
Supernova Model Discrimination with
Hyper-Kamiokande
Astrophys. J., 916, 15-32 (2021)
A-025
A. D. Pant
Muonium behavior in N-acetylglycine-Nmethylamide
BIBECHANA, 16
A-026
H. Nakagawa, et al.
Conformational dynamics of a multidomain protein by neutron scattering andcomputational analysis
Biophys. J., 120
A-027
N. Nishi, et al.
Overscreening Induced by Ionic Adsorption
at the Ionic Liquid/Electrode Interface
Detected Using Neutron Reflectometry witha Rational Material Design
Bull. Chem. Soc. Jpn., 94
A-028
Y. Kameda, et al.
Direct Observation of Scattering Angle
Dependence of the Inelasticity Effect on theInterference Term Obtained from Time-of-

J-PARC Annual Report 2021

Publications

83
Chem. Mater., 33

Few-Body Syst. 62, 110 (2021)

A-029
M. Shiozawa, et al.
Hyper-Kamiokande Project Has Started
Butsuri, 77, 792 (2021)

A-039
T.-N. Lam, et al.
Tensile Response of As-Cast CoCrFeNi and
CoCrFeMnNi High-Entropy Alloys
Crystals, 12

A-049
H. Fujioka, et al.
Search for the Lightest Double-Λ5
H, at J-PARC
Hypernucleus, ΛΛ
Few-Body Syst. 62, 47 (2021)

A-030
T. Masuda, et al.
Hybridized excitation of Higgs-amplitude
and phase modes in frustrated quantum
magnetButsuri, 76

A-040
T. Matsukawa, et al.
Detection of hydroxyl and hydride functionalgroups in a ceria crystal under hydrogen
reduction
CrystEngComm, 23

A-050
H. Fujioka, et al.
Correction to: Search for the Lightest
5
Double-Λ Hypernucleus, ΛΛ
H, at J-PARC [FewBody Syst (2021) 62:47]
Few-Body Syst. 62, 69 (2021)

A-031
T. Tanimori, et al.
Development of a neutron imaging method
based on particle reaction topology
Butsuri, 76

A-041
H. Yukawa, et al.
Temperature dependence of hydrogensolubility and diffusivity in hydrogen
permeable membrane of pd-cu alloy withb2-type crystal structure
Defect Diffus. Forum, 407

A-051
S. Kanda, et al.
New precise spectroscopy of the hyperfine
structure in muonium with a high-intensity
pulsed muon beam
Few-Body Syst., 62, 103 (2021)

Flight Neutron Diffraction Experiments
Bull. Chem. Soc. Jpn., 94

A-032
S. Klotz, et al.
Synthesis and characterisation of a newgraphitic C-S compound by high pressure
decomposition of CS2
Carbon, 185
A-033
S. Yamazoe, et al.
Identification of hydrogen species on Pt/
Al2O3 by in situ inelastic neutron scatteringand their reactivity with ethylene
Catal. Sci. Technol., 11
A-034
S. Behara, et al.
Amphoteric behavior of Dy3+ in
Na0.5Bi0.5TiO3: neutron diffraction and
Raman studies
Ceram. Int., 47
A-035
Y. Yano, et al.
Insights into Proton Dynamics in a
Photofunctional Salt-Cocrystal Continuum:Single-Crystal X-ray, Neutron Diffraction, andHirshfeld Atom Refinement
Chem. Eur. J., 27
A-036
K. Fukui, et al.
Stabilization Factor of Anion-Excess Fluorite
Phase for Fast Anion Conduction
Chem. Mater., 33

A-042
F. Nemoto, et al.
Structural and Dynamical Studies on Liquid
Crystalline Ionic Liquids by Thermal Analysis
and Neutron Scattering
Ekisho, 25
A-043
K. Yamamoto, et al.
Dependence of charge-exchange efficiency
on cooling water temperature of a beamtransport line
EPJ Techniques and Instrumentation 8 (2021)
9_1
A-044
T. Katabuchi, et al.
Discovery of a new low energy neutron
resonance of 89Y
Eur. Phys. J. A, 57
A-045
B. Abi, et al.
Prospects for beyond the Standard Model
physics searches at the Deep Underground
Neutrino ExperimentEur. Phys. J. C 81, 322 (2021)
A-046
B. Abi, et al.
Supernova neutrino burst detection with the
Deep Underground Neutrino ExperimentEur. Phys. J. C 81, 423 (2021)

A-037
M. Nakamura, et al.
Sn-Based Perovskite with a Wide Visible
Light Absorption Band Assisted by Hydride
DopingChem. Mater., 33

A-047
F. Sakuma, et al.
Recent Results and Future Prospects ofKaonic Nuclei at J-PARC
Few-Body Syst. 62, 103 (2021)

A-038
Y. Kitagawa, et al.
Site-Selective Eu3+ Luminescence in the
Monoclinic Phase of YSiO2N

A-048
T. Nanamura, et al.
The Analysis Status of Σ+p Scattering Eventsin the J-PARC E40 ExperimentA-052
Y. Fujii, et al.
Local Dynamics of the Hydration Water andPoly(Methyl Methacrylate) Chains in PMMA
Networks
Frontiers in Chemistry, 9
A-053
T. Yamashita, et al.
Time evolution calculation of muon
catalysed fusion: Emission of recycling
muons from a two-layer hydrogen film
Fusion Eng. Des., 169
A-054
K. Okutsu, et al.
Design for detecting recycling muon after
muon-catalyzed fusion reaction in solidhydrogen isotope target
Fusion Eng. Des., 170
A-055
N. Kawamura, et al.
Tritium behavior in isotropic graphite atroom temperature
Fusion Eng. Des., 172
A-056
J. Tang, et al.
Effect of Nonlinear Elasticity on the Swelling
Behaviors of Highly Swollen Polyelectrolyte
Gels
Gels, 7
A-057
Y. Tsuji, et al.
Neutralization and Salt Effect on the
Structure and Mechanical Properties of
Polyacrylic Acid Gels under Equivolume
Conditions
Gels, 7
A-058
N. Yamada, et al.
System Development for Analysis ofPublications

J-PARC Annual Report 2021

84
Research Achievements and Publication on
Web Site at J-PARC MLF
Hamon, Neutron network news, 31

Modern alchemy: Making “plastics” frompaper
Ind. Eng. Chem. Res., 60

based on measured phase stresses anddislocation density
Int. J. Plast., 140

A-059
N. Saito
Preface
Hamon, Neutron network news, 31, 105 (2021)

A-069
S. Nakano, et al.
Observation of dihydrogen bonds in highpressure phases of ammonia borane by X-ray
and neutron diffraction measurements
Inorg. Chem., 60

A-079
N. Ishida, et al.
Single-phase synthesis, average, electronic,
and local structure and cathode propertiesof pyroxene type LiFeSi2O6
Ionics, 27

A-070
H. Kwon, et al.
Programmable Synthesis of Silver Wheels
Inorg. Chem., 60

A-080
N. Tsuchida, et al.
Role of Deformation-Induced Martensite in
TRIP Effect of Metastable Austenitic Steels
ISIJ International, 61

A-060
A. Sano-Furukawa, et al.
High-pressure and high-temperatureneutron-diffraction experiments using
Kawai-type multi-anvil assemblies
High Press. Res., 41
A-061
S. Yamamoto, et al.
Three dimensional (3D) optical imaging
system of muon beams using a silver
activated zinc sulfide (ZnS(Ag)) sheet
combined with a mirror
IEEE Trans Nucl. Sci., 68
A-062
T. Kato, et al.
Muon-Induced Single-Event Upsets in 20-nm
SRAMs: Comparative Characterization with
Neutrons and Alpha Particles
IEEE Trans Nucl. Sci., 68
A-063
T. Okumura, et al.
Dynamical Response of Transition-Edge
Sensor Microcalorimeters to a Pulsed
Charged-Particle BeamIEEE Trans. Appl. Supercond., 31
A-064
H. Shishido, et al.
High Spatial Resolution Neutron
Transmission Imaging Using a
Superconducting Two-Dimensional Detector
IEEE Trans. Appl. Supercond., 31
A-065
T. Oda, et al.
Electric-Field-Dependence Mechanism for
Cosmic Ray Failure in Power Semiconductor
DevicesIEEE Trans. Electron Devices, 68
A-066
F. Tamura, et al.
Development of next-generation timing
system for the Japan Proton Accelerator
Research Complex
IEEE Trans. Nucl. Sci., 68 (2021) 2043
A-067
S. Dekkers, et al.
Radiation Tolerance of Online Trigger System
for COMET Phase-I
IEEE Trans. Nucl. Sci., 68, 2020 (2021)
A-068
Y. Iwamiya, et al.

A-071
Y. Zhang, et al.
Investigating the Chemical Ordering in
Quaternary Clathrate Ba8AlxGa16–xGe30
Inorg. Chem., 60
A-072
K. Kimura, et al.
Coexistence of Magnetoelectric andAntiferroelectric-like Orders in Mn3Ta2O8
Inorganic Chemistry, 60
A-073
S. Tajima, et al.
Synthesis and Ion-Transport Properties
of EuKGe2O6-, Ca3Fe2Ge3O12-, and
BaCu2Ge2O7- Type Oxide-Ion Conductors
Inorganic Chemistry, 60
A-074
D. Urushihara, et al.
Structural Transition with a Sharp Change
in the Electrical Resistivity and Spin-Orbit
Mott Insulating State in a Rhenium Oxide,
Sr3Re2O9
Inorganic Chemistry, 60
A-075
S. Harjo
Mechanism of strengthening in cast iron bypulsed neutron beamInspection Engineering, 26
A-076
A. Abed Abud, et al.
Deep Underground Neutrino Experiment(DUNE) Near Detector Conceptual Design
ReportInstruments 2021 5(4), 31 (2021)
A-077
S. Nogami, et al.
Structural changes in pH-responsive gelatin/hydroxypropyl methylcellulose phthalate
blends aimed at drug-release systems
Int. J. Biol. Macromol., 190
A-078
X.X. Zhang, et al.
Multiscale constitutive modeling ofadditively manufactured Al-Si-Mg alloys

A-081
S Harjo, et al.
Relation between Intergranular Stress ofAustenite and Martensitic Transformation in
TRIP Steels Revealed by Neutron Diffraction
ISIJ International, 61
A-082
N. Tsuchida, et al.
Effect of Temperature on Stress–Strain Curvein SUS316L Metastable Austenitic StainlessSteel Studied by In Situ Neutron Diffraction
Experiments
ISIJ International, 61
A-083
H. SATO, et al.
Improvement of Bragg-edge Neutron
Transmission Imaging for Evaluating theCrystalline Phase Volume Fraction in Steel
Composed of Ferrite and Austenite
ISIJ International, 61
A-084
K. Mishima

中性子寿命の謎，解明に向けた新しい手法(only Japanese)
Isotope News, 778, (only Japanese）

A-085
K. Maruyama, et al.
Magnetic phase diagram of helimagnetic
Ba(Fe1-xScx)12 O19 (0 ≤ x ≤ 0.2) hexagonal
ferriteJ. Alloy. Compd., 892
A-086
X.X. Zhang, et al.
Strain hardening behavior of additively
manufactured and annealed AlSi3.5Mg2.5
alloy
J. Alloys Compd.
A-087
R. Kataoka, et al.
Zirconium Hydride-Stabilized Yttrium
Hydride (ZSY): Stabiliza- tion of a FaceCentered Cubic YH3 Phase by Zr Substitution
J. Alloys Compd., 851

J-PARC Annual Report 2021

Publications

85
A-088
KD Liss, et al.
Anisotropic thermal lattice expansion andcrystallographic structure of strontium
aluminide within Al-10Sr alloy as measured
by in-situ neutron diffraction
J. Alloys. Compd., 869
A-089
T. Tominaga, et al.
Evaluation of sample cell materials foraqueous solutions used in quasi-elastic
neutron scattering measurements
J. Appl Cryst., 54
A-090
D. Miura, et al.
Development of spin-contrast-variation
neutron powder diffractometry for
extracting the structure factor of hydrogen
atoms
J. Appl. Cryst., 54
A-091
T. Okudaira, et al.
Polarization analysis for small-angle neutron
scattering with a 3He spin filter at a pulsed
neutron source
J. Appl. Cryst., 54
A-092
M. Mizusawa, K. Sakurai
2D real space visualization of d values inpolycrystalline bulk materials of different
hardness
J. Appl. Crystallogr., 54
A-093
H. Singh, V.K. Aswal
Tuning of micelle adsorption on
nanoparticles by combination of surfactants
J. Appl. Phys., 129
A-094
J. G. Nakamura, et al.
Hydrogen impurities in p-typesemiconductors, GeS and GeTe
J. Appl. Phys., 130
A-095
R. Maruyama, et al.
Improved performance of wide bandwidth
neutron-spin polarizer due to ferromagnetic
interlayer exchange coupling
J. Appl. Phys., 130
A-096
N. Sato, et al.
A feasibility study of inverse contrastmatching small-angle neutron scattering
method combined with size exclusion
chromatography using antibody interactions
as model systems
J. Biol. Chem., 169
A-097
E. Y. Kozhunova, et al.

Microphase separation of stimuli-responsive
interpenetrating network microgels
investigated by scattering methods
J. Colloid Interface Sci., 597
A-098
H. Arima-Osonoi, et al.
Local structure investigations of Sn and
Mn doped in β-Ga2O3 by X-ray absorption
spectroscopy
J. Cryst. Growth, 570
A-099
R. Yuge, et al.
Charge Compensation Mechanism andStructural Change of Li- Rich Layered Oxide
Li1.23Mn0.46Fe0.15Ni0.15O2 Electrodeduring Charging and Discharging
J. Electrochem. Soc., 168
A-100
K. Hattori, et al.
Wigner functions and quantum kinetic
theory of polarized photons
J. High Energ. Phys. 2021, 1 (2021)
A-101
S. Choudhury, et al.
Test of lepton flavor universality and search
for lepton flavor violation in B → K decays
J. High Energ. Phys. 2021, 105 (2021)
A-102
R. Mizuk, et al.
Measurement of the energy dependence of− −−the e+e– → BB , BB * and B*B * exclusive crosssections
J. High Energ. Phys. 2021, 137 (2021)
A-103
S. Jia, et al.
Measurements of branching fractions and−asymmetry parameters of Ξ0c → ΛK *0,
− 0
0
0
+
–
0
Ξc → Σ K * , and Ξc → Σ K* decays at BelleJ. High Energ. Phys. 2021, 160 (2021)
A-104
Y. Hidaka, et al.
Global 3-group symmetry and 't Hooft
anomalies in axion electrodynamics
J. High Energ. Phys. 2021, 173 (2021)
A-105
K. Uno, et al.
Search for lepton-flavor-violating tau-lepton
decays to γ at BelleJ. High Energ. Phys. 2021, 19 (2021)
A-106
S. H. Park, et al.
Search for the dark photon in B0 → A'A',
A' → e+e–, µ+µ–, and π +π – decays at BelleJ. High Energ. Phys. 2021, 191 (2021)
A-107
T. Hayata, et al.
Second order chiral kinetic theory undergravity and antiparallel charge-energy flow
J. High Energ. Phys. 2021, 23 (2021)
A-108
K. Hirota, et al.
Neutron Imaging Using a Fine-Grained
Nuclear Emulsion
J. Imaging, 7
A-109
K. Isegawa, et al.
The First Application of a Gd3Al2Ga3O12:Ce
Single-Crystal Scintillator to NeutronRadiography
J. Imaging, 7
A-110
N.V. Mdlovu, et al.
In vitro intracellular studies of pH andthermo-triggered doxorubicin conjugatedmagnetic SBA-15 mesoporous nanocarriers
for anticancer activity against hepatocellular
carcinoma
J. Ind. Eng. Chem., 102
A-111
J. Koga, et al.
Measurement of γ rays from 6LiF tile as an
inner wall of a neutron-decay detector
J. Instrum., 16
A-112
S. Yamamoto, et al.
Optical imaging of decayed positrons andmuons with different collimators
J. Instrum., 16
A-113
T. Yajima, et al.
Correlated Li-ion migration in the superionic
conductor Li 10 GeP 2 S 12
J. Mater. Chem. A, 9
A-114
T. Kato, et al.
Origins of peaks of graphitic and pyrrolicnitrogen in N1s X-ray photoelectron spectraof carbon materials: quaternary nitrogen,tertiary amine, or secondary amine?
J. Mater. Sci., 56
A-115
G. Yamamoto, et al.
Crystal structure of nesquehonite,
MgCO3·3H(D)2O by neutron diffractionand effect of pH on structural formulas ofnesquehonite
J. Mineral. Petrol. Sci., 116
A-116
Y. Mori, et al.
Neutron diffraction study of hydrogen site
occupancy in Fe0.95Si0.05 at 14.7 GPa and
800K.
J. Mineral. Petrol. Sci., 116

Publications

J-PARC Annual Report 2021

86
A-117
H. Abe, et al.
Spontaneous formations of nanoconfinedwater in ionic liquids by small-angle neutron
scattering
J. Mol. Liq.
A-118
H. AbePhase variety in ionic liquids: Hydrogenbonding and molecular conformations
J. Mol. Liq., 332
A-119
S. Hashimoto, et al.
Experimental analysis on dynamics of liquid
molecules adjacent to particles in nanofluids
J. Mol. Liq., 342
A-120
K. Shimada-Takaura, et al.
A novel challenge of nondestructive analysis
on OGATA Koan’s sealed medicine by muonic
X-ray analysis
J. Nat. Med., 75
A-121
M. Arai, et al.
The performance of neutron diffractometers
at long and short pulse spallation sources:
Comparison between ESS and J-PARC
J. Neutron Res., 23
A-122
T. Takamuku, et al.
Anion effects on the mixing statesof 1-methyl-3-octylimidazolium
tetrafluoroborate andbis(trifluoromethylsulfonyl)amide withmethanol, acetonitrile, and dimethyl
sulfoxide on the meso- and microscopic
scalesJ. Phys. Chem. B, 125
A-123
H. Watanabe, et al.
Local Structure of Li+ in Super-concentrated
Aqueous LiTFSA Solutions
J. Phys. Chem. B, 125
A-124
Y. Kameda, et al.
Experimental Determination of Relationshipbetween Intramolecular O-D Bond Lengthand Its Stretching Vibrational Frequency of
D2O Molecule in the Liquid State
J. Phys. Chem. B, 125
A-125
K. Ito, et al.
Dynamics of water in a catalyst layer of a fuelcell by quasielastic neutron scattering
J. Phys. Chem. C, 125
A-126
M. H. Petersen, et al.
Assessing diffusion relaxation of interlayerwater in clay minerals using a minimalist
three-parameter model
J. Phys. Chem. C, 125
A-127
X. Wang, et al.
Crystalline Fully Carboxylated Polyacetylene
Obtained under High Pressure as a Li-Ion
Battery Anode Material
J. Phys. Chem. Lett., 12
A-128
P. Luo, et al.
Neutron Spin–Echo Studies of the Structural
Relaxation of Network Liquid ZnCl2 at theStructure Factor Primary Peak and Prepeak
J. Phys. Chem. Lett., 12
A-129
N. Yamamoto, et al.
Freezable and Unfreezable Hydration Water:
Distinct Contributions to Protein Dynamics
Revealed by Neutron Scattering
J. Phys. Chem. Lett., 12
A-130
L. J. Bannenberg, et al.
Suppression of the Phase Coexistence of thefcc–fct Transition in Hafnium-Hydride Thin
Films
J. Phys. Chem. Lett., 12
A-131
M. Tabuchi, Y. Kobayashi
Appearance of pentavalent Fe ion as aresult of a charge disproportionation in Fesubstituted Li2MnO3J. Phys. Chem. Solids, 150
A-132
K. Itoh, R. Yamada, J. Saida, K. Ikeda and T.
Otomo
Atomic-level characterization of free volume
in the structure of Cu67Zr33 amorphousalloy
J. Phys. Condens. Matter., 33
A-133
S. Hosokawa, et al.
Detailed investigations on short- andintermediate-range structures of GeSe glasses near the stiffness transition
composition
J. Phys. Soc. Jpn., 90
A-134
F. Tamura
Development of the Next-Generation LLRF
Control System fo the J-PARC RCS
J. Phys. Soc. Jpn., 18, (2020) 151
A-135
R. Kurasaki, et al.
Production Target of Secondary Particles
for Slowly-Extracted High-Intensity Proton
Beams
J. Phys. Soc. Jpn., 18, 225 (2021)

A-136
T. Nakadaira, T. Matsubara
J-PARC Neutrino Production Target
J. Phys. Soc. Jpn. 18, 225 (2021)
A-137
Y. Kurimoto, et al.
Upgrade Plan of J-PARC Main Ring
J. Phys. Soc. Jpn. 18, No. 1, 10 (2021)
A-138
M. Fujita, et al.
Reduction Annealing Effects on the Crystal
Structure of T'-type La1.8Eu0.2CuO4+α–δ
J. Phys. Soc. Jpn., 90
A-139
D. Ueta, et al.
Complex Magnetic Phase Diagram in the
Non-Centrosymmetric Compound CePtSi3
J. Phys. Soc. Jpn., 90
A-140
D. Ueta, et al.
Crystalline electric field level scheme in the
non-centrosymmetric CeRhSi3 and CeIrSi3
J. Phys. Soc. Jpn., 90
A-141
K. Iwasa, et al.
Magnetic excitations in chiral-structurephase of Ce3Ir4Sn13
J. Phys. Soc. Jpn., 90
A-142
K. Kaneko, et al.
Charge-Density-Wave Order and Multiple
Magnetic Transitions in Divalent Europium
Compound EuAl4
J. Phys. Soc. Jpn., 90
A-143
D. Ueta, et al.
Oval-cycloidal Magnetic Structure with
Phase-shift in the Non-centrosymmetric
Tetragonal Compound CePdSi3
J. Phys. Soc. Jpn., 90
A-144
M. Fujita, et al.
Magnetic Excitations of Sr3Ir2O7 Observed
by Inelastic Neutron Scattering Technique
J. Phys. Soc. Jpn., 90
A-145
Y. Nambu, S. Shamoto
Neutron Scattering Study on Yttrium Iron
Garnet for Spintronics
J. Phys. Soc. Jpn., 90
A-146
K. Nawa, et al.
Strongly Electron-Correlated Semimetal RuI3
with a Layered Honeycomb Structure
J. Phys. Soc. Jpn., 90

J-PARC Annual Report 2021

Publications

87
A-147
K. Kodama, et al.
Magnetic structure of short-range ordering
in intermetallic antiferromagnet Mn3RhSi
J. Phys. Soc. Jpn., 90
A-148
K. Matsubayashi, et al.
Hybridization-Gap Formation andSuperconductivity in the Pressure-Induced
Semimetallic Phase of the Excitonic Insulator
Ta2NiSe5
J. Phys. Soc. Jpn., 90
A-149
S. Shamoto, et al.
Spin-flop Phase in a Honeycomb
Antiferromagnet Mn0.84Mg0.16TiO3
J. Phys. Soc. Jpn., 90
A-150
I. Hwang, et al.
Spin Wave Excitations in Honeycomb
Antiferromagnet MnTiO3
J. Phys. Soc. Jpn., 90
A-151
H. K. Yoshida, et al.
μSR Study of Kapellasite-type Quantum
Kagome Antiferromagnet CaCu3(OH)6Cl2 ·0.6H2OJ. Phys. Soc. Jpn., 91

A-157
M. Bogomilov, et al.
Performance of the MICE diagnostic syste
JINST 16, P08046, (2021)
A-158
B. Aimard, et al.
Performance study of a 3 × 1 × 1 m3 dual
phase liquid Argon Time Projection Chamber
exposed to cosmic rays
JINST 16, P08063, (2021)
A-159
H. Sasaki, et al.
Characterization of Precipitated Phase in CuNi-Si Alloy by Small Angle X-ray Scattering,
Small Angle Neutron Scattering and Atom
Probe Tomography
Journal of Japan Research Institute forAdvanced Copper-base Materials andTechnologies, 60
A-160
K. Tashiro, K. Kusaka
New Evolution in Crystal Structure Analysis
of Synthetic Polymers on the Basis ofConcerted Analysis of X-ray and Neutron
Diffraction Data
Journal of the Crystallographic Society ofJapan, 63

A-152
Y. Idemoto, et al.
Structural and electronic properties of spinel
type Mg1+yCo2-x-yMnxO4 for cathodeapplications in magnesium rechargeable
batteries
J. Power Sources, 482

A-161
N. Yamada
Structure analysis of organic thin filmwith X-ray and neutron reflectometry :Competitive analysis taking advantage of
X-ray or neutrons & comprehensive analysis
taking advantages of X-ray and neutrons
Journal of the Japanese Society for
Synchrotron Radiation Research, 34, No. 6

A-153
H. Yamada, et al.
Concerted influence of microstructure andadsorbed water on lithium-ion conductionof Li1.3Al0.3Ti1.7(PO4)3
J. Power Sources, 511

A-162
S. Sasada, et al.
High-spatial-resolution measurement ofmagnetization distribution using polarized
neutron imaging
Jpn. J. Appl. Phys., 60

A-154
N. Ishida, et al.
Average and local structure analysis of Na/
Li ion-exchanged Lix(Mn,Ni,Ti)O2 usingsynchrotron X-ray and neutron sources
J. Solid State Chem., 25

A-163
S. Harjo
Observation of metallographic structure bymeans of pulsed neutron diffraction
Kinzoku, materials science & technology, 91

A-155
A. Abed Abud, et al.
Searching for solar KDAR with DUNE
JCAP10(2021), 065 (2021)
A-156
B. Aimard, et al.
Study of scintillation light collection,
production and propagation in a 4 tonne
dual-phase LArTPCJINST 16, P03007, (2021)

A-164
S. Harjo

パルス中性子回折による金属組織観察（onlyJapanese）

Kinzoku, materials science & technology, 91(only Japanese）
A-165
T. Shinohara, et al.

エネルギー分析型中性子イメージング装置
RADEN（螺鈿）の開発 (only Japanese)

Kinzoku, materials science & technology, 91,
No. 3(only Japanese）

A-166
H. Iwase, et al.
Direct observation of the relationshipbetween thixotropic behavior and shearinduced orientation of clay particles insynesthetic hectorite suspensions
Langmuir, 37
A-167
M. Akamatsu, et al.
Contrast variation small-angle neutron
scattering study of solubilization of
perfumes in cationic surfactant micelles
Langmuir, 37
A-168
M. Harada, et al.
Combined small-angle neutron scattering/small-angle X-ray scattering analysis forthe characterization of silver nanoparticles
prepared via photoreduction in water-in-oil
microemulsions
Langmuir, 37
A-169
K. Shimokita, et al.
Investigation of Interfacial Water
Accumulation between Polypropylene Thin
Film and Si Substrate by Neutron Reflectivity
Langmuir, 37
A-170
H. Aoki, et al.
Neutron reflectometry tomography for
imaging and depth structure analysis of thinfilms with in-plane inhomogeneity
Langmuir, 37
A-171
Tsukasa Miyazaki, et al.
Layered Structure in the Crystalline
Adsorption Layer and the Leaching Processof Poly(vinyl alcohol) Revealed by Neutron
Reflectivity
Langmuir, 37
A-172
A. Izumi, et al.
In Situ Neutron Reflectometry Analysis ofInterfacial Structure Formation between
Phenolic Resin and Silica during Curing
Langmuir, 37
A-173
H. Taneda, et al.
Modification of a Polymer Surface by Partial
Swelling Using Non-solvents
Langmuir,37
A-174
H. Ogawa, et al.
Molecular Weight Effect on the Transition
Processes of a Symmetric PS-b-P2VP during
Spin-Coating
Macromolecules

Publications

J-PARC Annual Report 2021

88
A-175
Y. Kimura, et al.
Amphiphilic random cyclocopolymers as
versatile scaffolds for ring-functionalized andself-assembled materials
Macromolecules, 54(M=none, Fe, Co, Ni, and Cu) hydrogenstorage alloys: Composition distribution andoccupied site of doped element
Mater. Trans., 62

A-176
H. Saitoh, et al.
Hydrogen storage by earth-abundant
metals, synthesis and characterization of
Al3FeH3.9
Mater. Des.

金属鉄の水素化反応に硫黄が及ぼす影響と地球
核の進化過程 (only Japanese)

A-177
X.X.Zhang, et al.
Quantifying internal strains, stresses,
and dislocation density in additively
manufactured AlSi10Mg during loadingunloading-reloading deformation
Mater. Des., 198
A-178
S. Shamoto, et al.
Gallium-effect in a lead-free solder for silversheathed superconducting tape
Mater. Res. Express., 8
A-179
T. Yamashita, et al.
Work hardening behavior of dual phasecopper–iron alloy at low temperature
Mater. Sci. Eng. A, 819
A-180
M. Kumagai, et al.
In situ diffraction characterization on
microstructure evolution in austenitic
stainless steel during cyclic plastic
deformation and its relation to themechanical response
Mater. Sci. Eng. A, 820
A-181
Y. S. Kim, et al.
Multiple deformation scheme in directenergy deposited CoCrNi medium entropy
alloy at 210K
Mater. Sci. Eng. A, 828
A-182
W. Mao, et al.
Effect of deformation-induced martensitic
transformation on nonuniform deformationof metastable austenitic steel
Mater. Sci. Eng. A, 837
A-183
S. Nishida, et al.
Analysis of Residual Stress in SteelBar Processed by Cold Drawing andStraightening
Mater. Trans., 62
A-184
T. Nakagawa, et al.
Structural properties of (Ti, Zr)(Mn,Cr)2M0.1

A-185
R. Iizuka, H. Kagi

A-194
R. Okuma, M. Kofu, S. Asai, M. Avdeev, A.
Koda, H. Okabe, M. Hiraishi, S. Takeshita, K. M.
Kojima, R. Kadono, T. Masuda, K. Nakajima,
Z. Hiroi
Dimensional reduction by geometricalfrustration in a cubic antiferromagnet
composed of tetrahedral clusters
Nat. Commun., 12

Materia Japan, 61(only Japanese)

A-186
Y. Iwamoto, et al.
Measurements of Displacement Cross
Section of Tungsten under 389-MeV Proton
Irradiation and Thermal Damage Recovery
Materials Science Forum, Vol 1024, 95-101(2021)A-187
Y. S. Kim, et al.
Microstructural Evolution andMechanical Properties of Non-Equiatomic(CoNi)74.66Cr17Fe8C0.34 High-Entropy Alloy
Materials, 15
A-188
J. Kim, et al.
Effect of the Difference in Strength of Hardand Soft Components on the Synergetic
Strengthening of Layered Materials
Met. Mater. Int., 27
A-189
N. Koga, et al.
Effect of Solute Carbon on the Characteristic
Hardening of Steel at High Temperature
Metall. Mater. Trans. A, 52
A-190
N. Tsuchida, S. Harjo
Enhancement of Uniform Elongation
by Temperature Change during Tensile
Deformation in a 0.2C TRIP Steel
Metals, 11
A-191
L. Temleitner, et al.
Pressure Dependent Structure of MethanolWater Mixtures up 1.2 GPa: Neutron
Diffraction Experiments and Molecular
Dynamics Simulations
Molecules, 26
A-192
H. He, et al.
Stacking Fault Driven Phase Transformationin CrCoNi Medium Entropy Alloy
Nano Letters, 21
A-193
R. Yamane, et al.
Experimental evidence for the existence of asecond partially-ordered phase of ice VI
Nat. Commun., 12

A-195
P. Park, et al.
Spin texture induced by non-magnetic
doping and spin dynamics in 2D triangularlattice antiferromagnet h-Y(Mn,Al)O3
Nat. Commun., 12
A-196
S.-Q. Su, et al.
Water-oriented magnetic anisotropytransition
Nat. Commun., 12
A-197
S. Gao, et al.
Hydride-based antiperovskites with softanionic sublattices as fast alkali ionic
conductors
Nat. Commun., 12
A-198
G. Lin, et al.
Field induced quantum spin disorderedstate in spin-1/2 honeycomb magnet
Na2Co2TeO6 with small Kitaev interaction
Nat. Commun., 12
A-199
J. Dove, et al.
The asymmetry of antimatter in the proton
Nature 590, 561 (2021)
A-200
P. Hua, et al.
Nanocomposite NiTi shape memory alloy
with high strength and fatigue resistanceNature Nanotechnology, 16
A-201
B. Ma, et al.
Optimization of a slab geometry type cold
neutron moderator for RIKEN acceleratordriven compact neutron source
NIM A, 995
A-202
K. Yamanaka, et al.
Surface evolution and corrosion behaviourof Cu-doped carbide-reinforced martensitic
steels in a sulfuric acid solution
npj Materials Degradation, 5
A-203
Y. Morita, et al.
Development of medium-frequency cavity
loaded with multi-ring magnetic alloy cores
cooled by chemically inert liquid

J-PARC Annual Report 2021

Publications

89
Nucl. Instrum. Methods. Phys. Res., A 1010,
165525 (2021)
A-204
S. Ajimura, et al.
The JSNS2 detector
Nucl. Instrum. Methods. Phys. Res., A 1014,
165742 (2021)
A-205
Y. Sugiyama, et al.
Pulse shape discrimination of photons andneutrons in the energy range of 0.1 -- 2 GeVwith the KOTO un-doped CsI calorimeter
Nucl. Instrum. Methods. Phys. Res., A 987,
164825 (2021)
A-206
M. Kobayashi, et al.
Corrigendum to “Cosmic ray tests of a
GEM-based TPC prototype operated in ArCF4-isobutane gas mixtures” [Nucl. Instrum.
Methods Phys. Res. A 641 (2011) 37-47]
Nucl. Instrum. Methods. Phys. Res., A 988,
164800 (2021)
A-207
F. Tamura, et al.
Commissioning of the next-generation
LLRF control system for the Rapid Cycling
Synchrotron of the Japan Proton Accelerator
Research Complex
Nucl. Instrum. Methods. Phys. Res., A 999 (2021)
165211_1
A-208
M. Harada, et al.
Experimental characterization of highenergy component in extracted pulsed
neutrons at the J-PARC spallation neutron
sourceNucl. Instrum. Methods. Phys. Res., A, 1000
A-209
T. D. Vu, et al.
Practical tests of neutron transmission
imaging with a superconducting kineticinductance sensor
Nucl. Instrum. Methods. Phys. Res., A, 1006
A-210
A. S. Tremsin, et al.
Calibration and optimization of Bragg edge
analysis in energy-resolved neutron imaging
experiments
Nucl. Instrum. Methods. Phys. Res., A, 1009
A-211
F. Funama, et al.
Double-focusing geometry for phasecorrection in neutron resonance spin-echo
spectroscopy
Nucl. Instrum. Methods. Phys. Res., A, 1010
A-212
A. D. Pant, et al.
Muonium response to low oxygen levels in

haemoglobin and other biological aqueous
solutions and potential application towards
monitoring hypoxia
Nucl. Instrum. Methods. Phys. Res., A, 1011
A-213
T. Oda, et al.
Phase correction method in a wide detector
plane for MIEZE spectroscopy with pulsed
neutron beams
Nucl. Instrum. Methods. Phys. Res., A, 1012

Phys. Chem. Chem. Phys., 23
A-222
M. Kawano, et al.
Assessment of the UCST-type liquidliquid phase separation mechanism of
imidazolium-based ionic liquid, [C8mim][TFSI], and 1,4-dioxane by SANS, NMR, IR,
and MD simulations
Phys. Chem. Chem. Phys., 23

A-214
S. Yamamoto, et al.
Three-dimensional (3D) optical imaging ofmuon beam using a plastic scintillator platein waterNucl. Instrum. Methods. Phys. Res., A, 1015

A-223
Y. Zhai, et al.
Relevance of hydrogen bonded associates
to the transport properties and nanoscale
dynamics of liquid and supercooled
2-propanol
Phys. Chem. Chem. Phys., 23

A-215
Y. Tsuchikawa, et al.
Measurement of Doppler broadening ofprompt gamma-rays from various zirconiumand ferro-borons
Nucl. Instrum. Methods. Phys. Res., A, 991

A-224
S. Kanda, et al.
New precise spectroscopy of the hyperfine
structure in muonium with a high-intensity
pulsed muon beam
Phys. Lett. B 815, 136154 (2021)

A-216
N. Teshima, et al.
Development of a multiwire proportional
chamber with good tolerance to burst hits
Nucl. Instrum. Methods. Phys. Res., A, 999

A-225
Y. Fujimoto, K. Fukushima, Y. Hidaka
Deconfining phase boundary of rapidly
rotating hot and dense matter and analysis
of moment of inertia
Phys. Lett. B 816, 136184 (2021)

A-217
H. Takeshita, et al.
Measurement of nuclide production crosssections for proton-induced reactions on Mn
and Co at 1.3, 2.2, and 3.0 GeV
Nucl. Instrum. Methods. Phys. Res., B 511, pp.
30–41 (2021)

A-226
S. Nishimura, et al.
Rabi-oscillation spectroscopy of thehyperfine structure of muonium atoms
Phys. Rev. A, Vol 104, L020801 (2021)

A-218
A. Volkov, et al.
Properties of straw tubes for the tracking
detector of the COMET experiment
Nucl. Instrum. Methods. Phys., A 1004, 165242(2021)A-227
H. Hotchi
Effects of the Montague resonance on theformation of the beam distribution duringmultiturn injection painting in a highintensity proton ring
Phys. Rev. Accel. Beams (Internet), 23(5),p.050401_1 - 050401_13, 2020/05

A-219
A. D. Pant, et al.
Study of muonium behavior in n-type silicon
for generation of ultra cold muonium in
vacuumPhys. B, 613
A-220
L. A. Ma, et al.
Na-ion mobility in P2-type Na0.5 Mg x Ni0.17–
x Mn 0.83O2 (0 ≤ x ≤ 0.07) fromelectrochemical and muon spin relaxation
studies
Phys. Chem. Chem. Phys., 23
A-221
D. Gao, et al.
Phase transition and chemical reactivity of
1H-tetrazole under high pressure up to 100
GPa

A-228
P. K. Saha, et al.
First measurement and online monitoringof the stripper foil thinning and pinhole
formation to achieve a longer foil lifetime inhigh-intensity accelerators
Phys. Rev. Accel. Beams (Internet), 23(8),p.082801_1 - 082801_13, 2020/08
A-229
Y. Shobuda, et al.
Titanium nitride-coated ceramic break forwall current monitors with an improved
broadband frequency response
Phys. Rev. Accel. Beams (Internet), 23(9),p.092801_1 - 092801_18, 2020/09
A-230
R. Kitamura, et al.

Publications

J-PARC Annual Report 2021

90
Development of negative muonium ion
source for muon acceleration
Phys. Rev. Accel. Beams 24, 033403(2021)
A-231
B. Yee-Rendon, et al.
Design and beam dynamic studies ofa 30-MW superconducting linac for an
accelerator-driven subcritical system
Phys. Rev. Accel. Beams 24, 120101 (2021)
A-232
I. Yamada, et al.
High-intensity beam profile measurement
using a gas sheet monitor by beam induced
fluorescence detection
Phys. Rev. Accel. Beams, 24 (2021) 042801_1
A-233
J. Kamiya, et al.
Improved vacuum system for high-power
proton beam operation of the rapid cycling
synchrotron
Phys. Rev. Accel.Beams, 24 (2021) 083201_1
A-234
Z. H. Zhu, et al.
Muon spin relaxation and fluctuating
magnetism in the pseudogap phase of
YBa2Cu3Oy
Phys. Rev. B, 103
A-235
M. Hiraishi, et al.
Anomalous diamagnetism of electride
electrons in transition metal silicides
Phys. Rev. B, 103
A-236
H. Okabe, et al.
Local electronic structure of dilute hydrogenin β–MnO2
Phys. Rev. B, 103
A-237
P. Miao, et al.
Origin of magnetvolume effect in a cobaltite
Phys. Rev. B, 103
A-238
T. Omi, et al.
Antiferromagnetic-to-ferrimagnetic phasetransition with large electric-polarization
change in a frustrated polar magnet
CaBaCo4O7
Phys. Rev. B, 103

low temperatures
Phys. Rev. B, 103
A-241
J. Sugiyama, et al.
Pressure dependence of ferromagnetic
phase boundary in BaVSe3 studied withhigh-pressure μ+SR
Phys. Rev. B, 103
A-242
M. Miyajima, et al.
Spin-gap formation due to spin-Peierls
instability in π-orbital-ordered NaO2
Phys. Rev. B, 104
A-243
N. Higa, et al.
Critical slowing-down and field-dependent
paramagnetic fluctuations in the skyrmion
host EuPtSi: μSR and NMR studies
Phys. Rev. B, 104
A-244
M. Matsuura, et al.
Microscopic dynamics of lithium diffusion
in single crystal of the solid-state electrolyte
La2/3–xLi3xTiO3 (x = 0.13) studied byquasielastic neutron scattering
Phys. Rev. B, 104
A-245
Yanyan Shangguan, et al.
Evidence for strong correlations at finite
temperatures in the dimerized magnet
Na2Cu2TeO6
Phys. Rev. B, 104
A-246
K. Miwa, et al.
Measurement of the differential crosssections of the Σ–p elastic scattering in
momentum range 470 to 850 MeV/c
Phys. Rev. C 104, 45204 (2021)
A-247
T. Ishikawa, et al.
Resonance-like structure near the ηdthreshold in the γd → π 0ηd reaction
Phys. Rev. C 104, L052201 (2021)
A-248
C. Beleno, et al.
Measurement of the branching fractionof the decay B+ → π +π –+𝜈 in fullyreconstructed events at Belle
Phys. Rev. D 103, 112001 (2021)

A-239
P. Wu, et al.
Strong anharmonicity in tin monosulfide
evidenced by local distortion, high-energy
optical phonons, and anharmonic potential
Phys. Rev. B, 103

A-249
J. T. McNeil, et al.
Measurement of the resonant andnonresonant branching ratios in Ξ0c → Ξ0K+K–
Phys. Rev. D 103, 112002 (2021)

A-240
W. Chen, et al.
Spin-orbit phase behavior of Na2Co2TeO6 at

A-250
K. Abe, et al.
First T2K measurement of transverse

kinematic imbalance in the muon-neutrino
charged-current single-π + production
channel containing at least one proton
Phys. Rev. D 103, 112003 (2021)
A-251
Y. Guan, et al.
Measurement of branching fractions and CP
asymmetries for D+s → K+(η, π 0) andD+s → π +(η, π 0) decays at Belle
Phys. Rev. D 103, 112005 (2021)
A-252
K. Abe, et al.
Improved constraints on neutrino mixing
from the T2K experiment with 3.13 × 1021
protons on target
Phys. Rev. D 103, 112008 (2021)
A-253
S. Cao, et al.
Physics potential of the combined sensitivityof T2K-II, NO𝜈A extension, and JUNO
Phys. Rev. D 103, 112010 (2021)
A-254
K. Abe, et al.
Neutron-antineutron oscillation search using
a 0.37 megaton-years exposure of SuperKamiokande
Phys. Rev. D 103, 12008 (2021)
A-255
S. Kumano, Q. Song
Transverse-momentum-dependent parton
distribution functions up to twist 4 for spin-1
hadrons
Phys. Rev. D 103, 14025 (2021)
A-256
U. A. Acharya, et al.
Transverse momentum dependent forward
neutron single spin asymmetries intransversely polarized p + p collisions at−√ s = 200 GeV
Phys. Rev. D 103, 32007 (2021)
A-257
A. Aguilar-Arevalo, et al.
Search for three body pion decays π + → 𝑙+𝜈X
Phys. Rev. D 103, 52006 (2021)
A-258
U. A. Acharya, et al.
Transverse single-spin asymmetries of
midrapidity π 0 and η mesons in polarized−
p + p collisions at √ s = 200 GeV
Phys. Rev. D 103, 52009 (2021)
A-259
S. X. Li, et al.
Measurements of the branching fractions of
Λ+c → pη and Λ+c → pπ 0 decays at Belle
Phys. Rev. D 103, 72004 (2021)
A-260
E. Waheed, et al.

J-PARC Annual Report 2021

Publications

91
Measurement of the CKM matrix element|Vcb | from B0 → D*–+𝜈 at Belle [Phys. Rev. D
100, 052007 (2019)]
Phys. Rev. D 103, 79901 (2021)
A-261
T. Hayata, Y. Hidaka
Thermalization of Yang-Mills theory in a (3 +1)-dimensional small lattice system
Phys. Rev. D 103, 84502 (2021)
A-262
K. Abe, et al.
T2K measurements of muon neutrino
and antineutrino disappearance using
3.13 × 1021 protons on targe
Phys. Rev. D 103, L011101 (2021)
A-263
T. J. Moon, et al.
First determination of the spin and parity of
the charmed-strange baryon Ξc(2970)+
Phys. Rev. D 103, L111101 (2021)
A-264
S. Dubey, et al.
Search for B 0s → η' X ss− at Belle using a semiinclusive method
Phys. Rev. D 104, 12007 (2021)
A-265
L. Cao, et al.
Measurements of partial branching fractionsof inclusive B → X𝑢 + 𝜈 decays withhadronic tagging
Phys. Rev. D 104, 12008 (2021)
A-266
S. Jia, et al.
Search for the ηc2(1D) in e+e– → γηc2(1D) at−√ s near 10.6 GeV at Belle
Phys. Rev. D 104, 12012 (2021)
A-267
K. Abe, et al.
Diffuse supernova neutrino backgroundsearch at Super-Kamiokande
Phys. Rev. D 104, 122002 (2021)
A-268
J. Yelton, et al.
Measurement of the masses and widths ofthe Σc (2455)+ and Σc (2520)+ baryons
Phys. Rev. D 104, 52003 (2021)
A-269
Y. Li, et al.
Evidence for the decay Ω0c → π +Ω(2012)– →−π + (K Ξ)–
Phys. Rev. D 104, 52005 (2021)
A-270
S. X. Li, et al.
Measurement of the branching fraction of
Λ+c → pω decay at Belle
Phys. Rev. D 104, 72008 (2021)

A-271
Y. Hidaka, R. D. Pisarski
Effective models of a semi-quark-gluon
plasmaPhys. Rev. D 104, 74036 (2021)

A-282
L. Cao, et al.
Measurement of Differential Branching
Fractions of Inclusive B → X𝑢 + 𝜈 Decays
Phys. Rev. Lett. 127, 261801 (2021)

A-272
T. Hayata, et al.
Diagnosis of information scrambling from
Hamiltonian evolution under decoherence
Phys. Rev. D 104, 74518 (2021)

A-283
W. Hong, et al.
Extreme Suppression of Antiferromagnetic
Order and Critical Scaling in a TwoDimensional Random Quantum Magnet
Phys. Rev. Lett., 126

A-273
N. K. Nisar, et al.
Search for the decay B 0s → η'ηPhys. Rev. D 104, L031101 (2021)
A-274
H. Atmacan, et al.
Search for B0 → τ ±+– ( = e, µ) with ahadronic tagging method at Belle
Phys. Rev. D 104, L091105 (2021)
A-275
J. K. Ahn, et al.
− Decay at the J-PARC
Study of the KL → π 0𝜈𝜈KOTO ExperimentPhys. Rev. Lett. 126, 121801 (2021)
A-276
S. Wehle, et al.
Test of Lepton-Flavor Universality in
B+ → K*+– Decays at Belle
Phys. Rev. Lett. 126, 161801 (2021)
A-277
S. H. Hayakawa, et al.
Observation of Coulomb-Assisted Nuclear
Bound State of Ξ– --14N System
Phys. Rev. Lett. 126, 62501 (2021)
A-278
Y. B. Li, et al.
Measurements of the Branching Fractions of
the Semileptonic Decays Ξ0c → Ξ–+𝜈 andthe Asymmetry Parameter of Ξ0c → Ξ–π +Phys. Rev. Lett. 127, 121803 (2021)
A-279
U. A. Acharya, et al.
Probing Gluon Spin-Momentum Correlationsin Transversely Polarized Protons throughMidrapidity Isolated Direct Photons in p↑ + p−
Collisions at √ s = 200 GeV
Phys. Rev. Lett. 127, 162001 (2021)
A-280
F. Abudinen, et al.
− Decays Using an
Search for B+ → K +𝜈𝜈
Inclusive Tagging Method at Belle II
Phys. Rev. Lett. 127, 181802 (2021)
A-281
F. Abudinen, et al.
Precise Measurement of the D0 and D+
Lifetimes at Belle II
Phys. Rev. Lett. 127, 211801 (2021)

A-284
T. Okumura, et al.
Deexcitation Dynamics of Muonic Atoms
Revealed by High-Precision Spectroscopy ofElectronic K X rays
Phys. Rev. Lett., 127
A-285
M. Nagao, et al.
Relationship between viscosity and acyl taildynamics in lipid bilayers
Phys. Rev. Lett., 127
A-286
T. Hayashida, et al.
Phase transition and domain formation in
ferroaxial crystals
Phys. Rev. Mater., 5
A-287
S. Shamoto, et al.
Broken C4 symmetry in the tetragonal stateof uniaxial strained BaCo0.9Ni0.1S1.9
Phys. Rev. Res., 3
A-288
S. Hasegawa, et al.
Nontrivial temperature dependence ofmagnetic anisotropy in multiferroics
Ba2MnGe2O7
Phys. Rev. Res., 3
A-289
K. Hagiwara, et al.
Superconducting gap and pseudogap
in the surface states of the iron-based
superconductor PrFeAsO1–y studied byangle-resolved photoemission spectroscopy
Phys. Rev. Research, 3
A-290
Y. Hirano, et al.
Position distribution calculation ofannihilation radiations and bremsstrahlung
x rays in water during irradiation of positive
muons: a Monte Carlo simulation study
Phys. Scr., 96
A-291
O. K. Forslund, et al.
Co-existence of short- and long-range
magnetic order in LaCo2P2
Phys. Scr., 96

Publications

J-PARC Annual Report 2021

92
A-292
J.-H. Hong, et al.
Poly[oligo(2-ethyl-2-oxazoline)
methacrylate] as a surface modifier forbioinertness
Polym. J., 53
A-293
S. Hiroshige, et al.
Temperature-dependent relationshipbetween the structure and mechanicalstrength of volatile organic compoundfree latex films prepared from poly(butyl
acrylate-co-methyl methacrylate)microspheres
Polym. J., 53
A-294
T. Maeda, M. Kitagawa, A. Hotta
Degradation of thermoresponsive laponite/
PEG-b-PLGA nanocomposite hydrogels
controlled by blending PEG-b-PLGA diblock
copolymers with different PLGA molecularweights
Polymer Degradation and Stability, 187
A-295
S. Ishida, et al.
Superconductivity-driven ferromagnetismand spin manipulation using vortices in themagnetic superconductor EuRbFe4As4
Proc. Nat. Acad. Sci. U.S.A., 118
A-296
A. Arbuzov, et al.
On the physics potential to study the gluon
content of proton and deuteron at NICA SPD
Prog. Part. Nucl. Phys. 119, 103858 (2021)
A-297
S. Igarashi, et al.
Accelerator design for 1.3-MW beam power
operation of the J-PARC Main Ring
Prog. Theor. Exp. Phys. 2021, 033G01 (2021)
A-298
K. Abe, et al.
Measurements of −
𝜈 µ and −𝜈 µ + 𝜈µ chargedcurrent cross-sections without detectedpions or protons on water and hydrocarbon
at a mean anti-neutrino energy of 0.86 GeV
Prog. Theor. Exp. Phys. 2021, 043C01 (2021)
A-299
J. Park, et al.
Slow control and monitoring system at the
JSNS2
Prog. Theor. Exp. Phys. 2021, 063C01 (2021)
A-300
M. Yoshimoto, et al.
First observation of a nuclear s-state of a Ξhypernucleus, 15
ΞC
Prog. Theor. Exp. Phys. 2021, 073D02 (2021)
A-301
A. Orii, et al.

Search for tens of MeV neutrinos associatedwith gamma-ray bursts in SuperKamiokande
Prog. Theor. Exp. Phys. 2021, 103F01 (2021)
A-302
K. S. Tanaka, et al.
Development of microwave cavities formeasurement of muonium hyperfine
structure at J-PARC
Prog. Theor. Exp. Phys., 2021
A-303
Y. Onuki, S. SatoIn Situ Observation for DeformationInduced Martensite Transformation duringTensile Deformation of SUS 304 StainlessSteel by Using Neutron Diffraction PART
II: Transformation and Texture Formation
Mechanisms
Quantum Beam Sci., 5
A-304
F. Grazzi, et al.
A multi-technique tomography-based
approach for non-invasive characterizationof additive manufacturing components
in view of vacuum/UHV applications:preliminary results
Rendiconti Lincei. Scienze Fisiche e Naturali
A-305
Y. Nishizawa, et al.
Nanostructure and thermoresponsivenessof poly(N-isopropyl methacrylamide)based hydrogel microspheres prepared
via aqueous free radical precipitation
polymerization
RSC Advances, 11
A-306
M. Uchida, et al.
Above-ordering-temperature large
anomalous Hall effect in a triangular-latticemagnetic semiconductor
Sci. Adv., 7
A-307
Y. Hao, et al.
Field-tuned magnetic structure and phase
diagram of the honeycomb magnet YbCl3
Sci. China: Phys., Mech. Astron., 64
A-308
M. Kofu, et al.
Spin glass behavior and magnetic boson
peak in a structural glass of a magnetic ionicliquidSci. Rep., 11A-309
R. Iizuka-Oku, et al.
Behavior of light elements in iron-silicatewater-sulfur system during early Earth's
evolution
Sci. Rep., 11A-310
M. Akamatsu, et al.
Rapid controlled release by photo-irradiation
using morphological changes in micelles
formed by amphiphilic lophine dimers
Sci. Rep., 11
A-311
Y. Ohtsuka, et al.
Emergence of spin-orbit coupledferromagnetic surface state derived from
Zak phase in a nonmagnetic insulator FeSi
Science Advances, 7
A-312
H. Aoki, et al.
Deep learning approach for an interface
structure analysis with a large statisticalnoise in neutron reflectometry
Scientific Reports, 11
A-313
Y. Su, et al.
Neutron Bragg-edge transmission imaging
for microstructure and residual strain in
induction hardened gears
Scientific Reports, 11
A-314
M. Busi, et al.
A parametric neutron Bragg edge imaging
study of additively manufactured samples
treated by laser shock peening
scientific reports, 11
A-315
M.S. Lee, et al.
In-situ neutron diffraction study of lattice
deformation behaviour of commercially puretitanium at cryogenic temperature
Scientific reports, 12
A-316
H. Nakao, et al.
Development of membrane-insertable
lipid scrambling peptides: A time-resolved
smallangle neutron scattering study
Struct. Dyn., 8
A-317
T. D. Vu, et al.
Homogeneity of neutron transmission
imaging over a large sensitive area with afour-channel superconducting detector
Supercond. Sci. Technol., 34
A-318
S. Harjo, et al.
Relation between intergranular stress inaustenite and martensitic transformation in
TRIP steels revealed by neutron diffraction
TETSU-TO-HAGANE, 107
A-319
J. Hendriks, et al.
Bayesian non-parametric Bragg-edge fitting
for neutron transmission strain imaging

J-PARC Annual Report 2021

Publications

93
The J. Strain Anal. Eng. Des., 56

Trans. Jpn. Soc. Mech. Eng., 87

A-320
H. Yoshida, et al.
Observation of Adsorbed Hydrogen Species
on Supported Metal Catalysts by Inelastic
Neutron Scattering
Topics in Catalysis, 64

A-322
N. Yamashita, et al.
Highly Swollen Adsorption Layer Formed byPolymeric Friction Modifier Providing Low
Friction at Higher Temperature
Tribol. Lett., 69

A-321
T. Suzuki, et al.
Residual stress evaluation by pulsed neutronstress measurement for cruciform welded
joints treated with ultrasonic impact method

A-323
K. Sakai, et al.
Observation of Grease Fluidity in a Ball
Bearing Using Neutron Imaging Technology
Tribology Online, 16

A-324
A. Yoshiasa, et al.
High-temperature diffraction experiments
and phase diagram of ZrO2 and ZrSiO4
Zeitschrift für Naturforschung B
A-325
J. Sugiyama, et al.
How Li diffusion in spinel Li[Ni1/2Mn3/2]O4
is seen with μ±SR
Zeitschrift für Physikalische Chemie

Conference Reports and Books
B-001
Y. Kondo, et al.
Reference design of the RFQ for the JAEAADS linac
JPS Conf. Proc. 33, 011015 (2021)
B-002
S. Saito, et al.
Status of LBE studies and experimental plan
at JAEAJPS Conf. Proc. 33, 011041 (2021)
B-003
F. Maekawa, et al.
A Plan of Materials Irradiation Facility at
J-PARC for Development of ADS and Highpower Accelerator Facilities
JPS Conf. Proc. 33, 011042 (2021)
B-004
B. Yee-Rendon, et al.
Present Status of the R&D of theSuperconducting Linac for the JAEA-ADS
JPS Conf. Proc. 33, 011043 (2021)
B-005
G. Ariyoshi, et al.
Measurement of liquid metal flows withelectro-magnetic probe
JPS Conf. Proc. 33, 011044 (2021)
B-006
H. Takeshita, et al.
Nuclide production cross sections of Ni andZr irradiated with 0.4-, 1.3-, 2.2-, and 3.0-GeV
protons
JPS Conf. Proc. 33, 011045 (2021)
B-007
H. Iwamoto, et al.
Estimation of uncertainty in proton-induced
spallation neutron multiplicities for Pb, W, Fe,
and C targets
JPS Conf. Proc. 33, 011046 (2021)
B-008
H. Matsuda, et al.
Measurement of Nuclide Production Cross-

Sections of natFe for 0.4–3.0 GeV Protons in
J-PARCJPS Conf. Proc. 33, 011047 (2021)
B-009
H. Obayashi, et al.
Remote Handling Technology for LeadBismuth Spallation Target System
JPS Conf. Proc. 33, 011048 (2021)
B-010
J. Tamura, et al.
RF design of the prototype spoke cavity for
the JAEA-ADS linac
JPS Conf. Proc. 33, 011049 (2021)
B-011
S. Meigo, et al.
Measurement of displacement cross section
for proton in the kinetic energy range from
0.4 GeV to 3 GeV
JPS Conf. Proc. 33, 011050 (2021)
B-012
T. Sasa, et al.
250kW LBE Spallation Target for ADS
Development in J-PARC
JPS Conf. Proc. 33, 011051 (2021)
B-013
Y. Sumi, et al.
Basic design of L-band disk-loaded structure
for muon LINAC
Proc. Ann. Mtg. PASJ(Internet), 133-137(2021)
B-014
K. Nii, et al.
Reports of electropolishing implementation
for quarter-wave resonators
Proc. Ann. Mtg. PASJ(Internet), 334-337(2021)
B-015
Y. Takeuchi, et al.
Detailed design of the Disk-and-Washer
Cavity for Muon Linear Accelerator
Proc. Ann. Mtg. PASJ(Internet), 343-347(2021)

B-016
T. Takayanagi, et al.
LTD SEMICONDUCTOR SWITCH POWER
SUPPLY FOR J-PARC KICKER
Proc. Ann. Mtg. PASJ(Internet), 53-57(2021)
B-017
M. Sugita, et al.
Experimental verification of magnetic fieldmeasurement probe for RCS bump magnet
Proc. Ann. Mtg. PASJ(Internet), 641-644(2021)
B-018
M. Mizusawa, K. Sakurai
PROJECTION-TYPE X-RAY DIFFRACTIONIMAGING FOR POLYCRYSTALLINE MATERIALS:
APPLICATION TO VICKERS HARDNESS TESTBLOCKS
Advances in X-ray Analysis, 64
B-019
S. Mihara
Investigation of the Last Flavor Violation in
Particle Physics
AIP Conf. Proc. 2319, 20001 (2021)
B-020
K. Tanaka
Major Accelerator Facilities for Nuclear
Physics in Asia Pacific
AIP Conf. Proc. 2319, 80008 (2021)
B-021
T. Ishikawa, et al.
ωN scattering length from ω photoproduction
on the proton near the threshold
AIP Conf. Proc. 2319, 80017 (2021)
B-022
A. Ueno, et al.
110 mA operation of J-PARC cesiated RFdriven H– ion source
AIP Conf. Proc. 2373, 040002_1 (2021)
B-023
T. Shibata, et al.
High-speed Emittance Measurements for
Beams Extracted from J-PARC RF Ion SourcePublications

J-PARC Annual Report 2021

94
AIP Conf. Proc. 2373, 050002 (2021)
B-024
Y. Takayama, et al.
Texture evolutions in aluminum and Al3%Mg alloy subjected to shear deformationand subsequent annealing
IOP Conf. Ser.: Mater. Sci. Eng., 1121
B-025
M. Yotsuzuka, et al.
Simulation of the Beam Commissioning
Method for a Muon APF IH-DTL in the J-PARC
Muon g - 2/EDM Experiment
JPS Conf. Proc. 33, 11040 (2021)

J-PARC Main Ring Upgrade toward High
Repetition Rate Operation
JPS Conf. Proc. 33, 011001 (2021)
B-035
C. Ohmori, et al.
J-PARC Contributions to the LHC Injector
Upgrade (LIU) Project
JPS Conf. Proc. 33, 011006 (2021)
B-036
H. Oguri, et al.
Status of the J-PARC RF-Driven H- Ion Source
JPS Conf. Proc. 33, 011008 (2021)

B-026
T. Yoshioka, et al.
Positron Tracking Detector for Muon g - 2/EDM
Experiment at J-PARC
JPS Conf. Proc. 33, 11108 (2021)

B-037
T. Shibata, et al.
Phase Space Formation of High Intensity 60
and 80 mA H- Beam with Orifice in J-PARC
Front-EndJPS Conf. Proc. 33, 011010 (2021)

B-027
N. Kawamura, et al.
A new approach for Mu – Mu Conversion
SearchJPS Conf. Proc. 33, 11120 (2021)

B-038
K. Okabe, et al.
High Intensity Beam Studies for the New
MEBT1 Design
JPS Conf. Proc. 33, 011011 (2021)

B-028
C. Zhang, et al.
Simulation Study of Laser Ionization of
Muonium by 1S-2S Excitation for the Muong - 2/EDM Experiment at J-PARC
JPS Conf. Proc. 33, 11125 (2021)

B-039
R. Kitamura, et al.
Bunch-Size Measurement of the HighIntensity H- Beam with 3 MeV by the BunchShape Monitor
JPS Conf. Proc. 33, 011012 (2021)

B-029
H. Yasuda, et al.
Development of Spin Flip Analysis for the
J-PARC Muon g - 2/EDM Experiment
JPS Conf. Proc. 33, 11126 (2021)

B-040
R. Kitamura, et al.
Bunch-Size Measurement of the HighIntensity H– Beam with 3 MeV by the BunchShape Monitor
JPS Conf. Proc. 33, 011012 (2021)

B-030
Y. Nakazaw, et al.
Multipacting simulations of coaxial coupler
for IH-DTL prototype in muon accelerator
JPS Conf. Proc. 33, 11128 (2021)
B-031
Y. Takeuchi, et al.
Error Studies for Muon Linac in the Muon g-- 2/EDM Experiment at J-PARC
JPS Conf. Proc. 33, 11129 (2021)
B-032
T. Matsubara
T2K future prospects with J-PARC neutrino
beam and near detector upgrades
JPS Conf. Proc. 33, 11141 (2021)
B-033
H. Harada, et al.
Simulation study of heavy ion accelerationin J-PARCJPS Conf. Proc. 33 (2021) 011028_1
B-034
Y. Kurimoto, et al.

B-041
T. Morishita
Precise Survey and Alignment Results of the
J-PARC Linac
JPS Conf. Proc. 33, 011013 (2021)
B-042
H. Takahashi, et al.
Monitoring System of Number of Particles in
J-PARC Linac and RCS
JPS Conf. Proc. 33, 011014 (2021)
B-043
Y. Kondo, et al.
Reference Design of the RFQ for JAEA ADSLinac
JPS Conf. Proc. 33, 011015 (2021)
B-044
K. Yamamoto, et al.
Reliability of J-PARC Accelerator System Overthe Past Decade
JPS Conf. Proc. 33, 011016 (2021)

B-045
N. Hayashi, et al.
High Intensity Measurement Issues at the
J-PARC RCSJPS Conf. Proc. 33, 011017 (2021)
B-046
H. Hotchi, et al.
1.2-MW-Equivalent High-Intensity Beam
Tests in J-PARC RCSJPS Conf. Proc. 33, 011018 (2021)
B-047
M. Yoshimoto, et al.
Analysis of J-HBC Stripper Foil for the J-PARC
RCS
JPS Conf. Proc. 33, 011019 (2021)
B-048
T. Takayanagi, et al.
Kicker Power Supply for J-PARC 3-GeV RCS
with SiC-MOSFETJPS Conf. Proc. 33, 011020 (2021)
B-049
F. Tamura, et al.
Flexible Chopper Gate Pulse Generation for
the J-PARC RCSJPS Conf. Proc. 33, 011021 (2021)
B-050
M. Yamamoto, et al.
Operation Experience of Tetrode Vacuum
Tubes in J-PARC Ring RF System
JPS Conf. Proc. 33, 011022 (2021)
B-051
J. Kamiya, et al.
Recent Status & Improvements of the RCS
Vacuum System
JPS Conf. Proc. 33, 011023 (2021)
B-052
I. Yamane
Application of Doppler-free Two-Photons
Excitation to Laser Stripping of J-PARC
400 MeV H- BeamJPS Conf. Proc. 33, 011024 (2021)
B-053
P. K. Saha, et al.
Studies of Laser Power Reduction for theLaser Stripping of 400 MeV H- Beam at
J-PARC RCSJPS Conf. Proc. 33, 011025 (2021)
B-054
H. Harada, et al.
Development of Laser System for Laser
Stripping Injection
JPS Conf. Proc. 33, 011026 (2021)
B-055
H. Harada, et al.
New Method for High Resolution Analysis
of Betatron Tune in a Rapid Cycling
Synchrotron or a Booster Ring

J-PARC Annual Report 2021

Publications

95
JPS Conf. Proc. 33, 011027 (2021)

JPS Conf. Proc. 33, 011038 (2021)

B-056
H. Harada, et al.
Simulation Study of Heavy Ion Accelerationin J-PARCJPS Conf. Proc. 33, 011028 (2021)

B-067
M. J. Shirakata
Neutron and Gamma Impact on Devices
with Iron Shields
JPS Conf. Proc. 33, 011039 (2021)

B-057
S. Igarashi, et al.
Study on the Beam Intensity Upgrade of
J-PARC Main Ring
JPS Conf. Proc. 33, 011029 (2021)

B-068
M. Yotsuzuka, et al.
Simulation of the Beam Commissioning
Method for a Muon APF IH-DTL in the J-PARC
Muon g - 2/EDM Experiment
JPS Conf. Proc. 33, 011040 (2021)

B-058
T. Yasui, et al.
Injection Optics Matching of the HighIntensity Beam at J-PARC MR
JPS Conf. Proc. 33, 011030 (2021)
B-059
Y. Sugiyama, et al.
Simulation of Phase-space Offset Injection
with Second Harmonic RF for Longitudinal
Emittance Blow-up in J-PARC MR
JPS Conf. Proc. 33, 011031 (2021)
B-060
Y. Morita, et al.
Design of VHF System in J-PARC Main Ring
JPS Conf. Proc. 33, 011032 (2021)
B-061
T. Shibata, et al.
The Eddy Current Type New Septum Magnet
for Upgrading of Fast Extraction in MR of
J-PARCJPS Conf. Proc. 33, 011033 (2021)
B-062
T. Shibata, et al.
The New High Field Septum Magnets for
Upgrading of Fast Extraction in MR of J-PARC
JPS Conf. Proc. 33, 011034 (2021)
B-063
M. Tomizawa, et al.
Initial Tests for Electrostatic Septum Using
Carbon Nanotube Wires
JPS Conf. Proc. 33, 011035 (2021)
B-064
T. Shimogawa, et al.
Proposal of Non-destructive Device for Slow
Extraction
JPS Conf. Proc. 33, 011036 (2021)
B-065
J. TakanoLayer Short Circuits of Bending Magnets in
the J-PARC Main Ring and 3-50BT
JPS Conf. Proc. 33, 011037 (2021)
B-066
K. Kadowaki, et al.
Evaluation of Soundness of Magnets in
3-50BT Line

B-069
J. Tamura, et al.
RF Design of the Prototype Spoke Cavity for
the JAEA-ADS Linac
JPS Conf. Proc. 33, 011049 (2021)
B-070
Y. Nakazawa, et al.
Multipacting simulations of coaxial coupler
for IH-DTL prototype in muon accelerator
JPS Conf. Proc. 33, 011128 (2021)
B-071
Y. Takeuchi, et al.
Error Studies for Muon Linac in the Muon g-- 2/EDM Experiment at J-PARC
JPS Conf. Proc. 33, 011129 (2021)
B-072
M. Ohta, et al.
Magnetic Field Dependence on
Crystallization Process of FINEMET® Nanocrystalline Alloy Detected by μSR Method
JPS Conf. Proc. 33
B-073
N. Kawamura, et al.
A New Approach for Mu – Mu Conversion
SearchJPS Conf. Proc. 33
B-074
M. Yotsuzuka, et al.
Simulation of the Beam Commissioning
Method for a Muon APF IH-DTL in the J-PARC
Muon g – 2=EDM Experiment
JPS Conf. Proc. 33
B-075
N. Kawamura on behalf of muon science
section MLF J-PARC
Current Status of Muon Science Facility
JPS Conf. Proc. 33
B-076
K. Ninomiya, et al.
Muonic X-ray Identification of Nuclear
Materials Sealed in a Box
JPS Conf. Proc. 33
B-077
T. Yoshioka, et al.

Positron Tracking Detector for Muong – 2 = EDM Experiment at J-PARC
JPS Conf. Proc. 33
B-078
C. Zhang, et al.
Simulation Study of Laser Ionization of
Muonium by 1S-2S Excitation for the Muong – 2 = EDM Experiment at J-PARC
JPS Conf. Proc. 33
B-079
H. Yasuda, et al.
Development of Spin Flip Analysis for the
J-PARC Muon g – 2 = EDM Experiment
JPS Conf. Proc. 33
B-080
Y. Nakazawa, et al.
Multipacting Simulations of Coaxial Coupler
for IH-DTL Prototype in Muon Accelerator
JPS Conf. Proc. 33
B-081
Y. Takeuchi, et al.
Error Studies for Muon Linac in the Muong – 2 = EDM Experiment at J-PARC
JPS Conf. Proc. 33
B-082
N. Kawamura, et al.
Safety Measure Against Tritium in the MLF
Muon Target
JPS Conf. Proc. 33
B-083
M. Matsuura, et al.
Position Dependency of the Scattered
Intensity in the Time-of-flight Backscattering
Spectrometer DNA
JPS Conf. Proc. 33
B-084
T. Tominaga, et al.
Corrosion of Aluminum-based Containers
for Neutron Studies with Aqueous Samples
under Low Temperatures
JPS Conf. Proc. 33
B-085
T. Tominaga, et al.
Water dynamics of double-network
polymers in a primally hierarchical structure
JPS Conf. Proc. 33
B-086
T. Tominaga, et al.
Position-Encoded Automatic Cell Elevator for
BL02, J-PARC MLF
JPS Conf. Proc. 33
B-087
T. Tominaga, et al.
Quartz Cell for a Backscattering
Spectrometer
JPS Conf. Proc. 33

Publications

J-PARC Annual Report 2021

96
B-088
T. Yamada, et al.
Commissioning for QENS Experiments at
Pressures Up to 200 MPa at MLF, J-PARC
JPS Conf. Proc. 33

B-098
K. Ohishi, et al.
Small angle neutron scattering study near
the critical field at low temperature in MnSi
JPS Conf. Proc. 33

B-089
T. Yamada, T. Tominaga
In Situ Quasi-Elastic Neutron Scatteringof Nafion Membrane with Water–Vapor
Pressure Control System
JPS Conf. Proc. 33

B-099
F. Kaneko, et al.
Application of simultaneous measurement
system combining wide q-range small-angle
neutron scattering and polarized Fouriertransform infrared spectroscopy: Cocrystalof syndiotactic polystyrene with methyl
benzoate
JPS Conf. Proc. 33

B-090
M. Nakada, et al.
Static and Dynamic Structure Analysis ofIntermediate Water on Polyvinyl Pyrrolidone
Using Neutron Scattering
JPS Conf. Proc. 33
B-091
Y. Tsuchikawa, et al.
Feasibility study of PGAA for boride
identification in simulated melted corematerials
JPS Conf. Proc. 33
B-092
K. Sakai, et al.
Study of neutron–nuclear spin correlation
term with a polarized Xe target
JPS Conf. Proc. 33
B-093
T. Okudaira, et al.
A Neutron Depolarization Measurement ofSingle Crystal Fe by Using a 3He Neutron
Spin Filter and Magnetic Super-mirrors
JPS Conf. Proc. 33
B-094
S. Itoh, et al.
Dynamical studies in condensed matter
on High Resolution Chopper Spectrometer(HRC) – 2nd phase of HRC project –JPS Conf. Proc. 33
B-095
Y. Kawakita, et al.
Mode distribution analysis for superionicmelt of CuI by coherent quasielastic neutron
scattering
JPS Conf. Proc. 33

B-100
H. Iwase, et al.
Rheo-SANS study on shear thinningbehavior of cationic gemini surfactant (12–2–12) in salt-free solution
JPS Conf. Proc. 33
B-101
J. Kobayashi, et al.
Structural analysis of microemulsion formed
from polymer surfactant polyglycerol esters
in the manufacturing process
JPS Conf. Proc. 33
B-102
T. Honda, et al.
Adsorbed polymer effects on particle
dispersion in polymeric matrix examined by
SANS
JPS Conf. Proc. 33
B-103
Y. Sakaguchi, et al.
Recent development of the sample
environment for light irradiation
experiments at the Materials and Life
Science Experimental Facility
JPS Conf. Proc. 33
B-104
M. Iguchi, et al.
Thermal Stability and Interfacial Segregation
for Polymer Thin Films Blended with a
Homologue Having Different Tacticity
JPS Conf. Proc. 33

B-096
K. Nakajima, et al.
Recent update of AMATERAS: a cold-neutron
disk-chopper spectrometer
JPS Conf. Proc. 33

B-105
F. Nemoto, et al.
Installation of a Rheometer on Neutron
Reflectometer SOFIA at J-PARC towardRheo-NR and Observation for Crystallization
Behavior of Cocoa Butter in Chocolate
JPS Conf. Proc. 33

B-097
Y. Shoda, et al.
Structural analysis of polybutadienes withurethane linkages by small-angle neutron
scattering
JPS Conf. Proc. 33

B-106
R. Maruyama, et al.
Improvement in sputtering rate uniformity
over large deposition area of large-scale ion
beam sputtering system
JPS Conf. Proc. 33

B-107
K. Maruyama, et al.
Helimagnetism of Ba(Fe1–xScx)12O19
Studied by Magnetization Measurement andNeutron Diffraction
JPS Conf. Proc. 33
B-108
A. Nakao, et al.
Determination of Crystallographic Planes for
a Polyhedral Single Crystal
JPS Conf. Proc. 33
B-109
Y. Ishikawa, et al.
Electrostatic Potential Mapping by Maximum
Entropy Method based on Mott-Bethe
relationsJPS Conf. Proc. 33
B-110
K. Kodama, et al.
Magnetic Pair Distribution Function of Spinglass System Mn0.5Fe0.5TiO3
JPS Conf. Proc. 33
B-111
S. Hosokawa, et al.
Local- and Intermediate-Range Atomic
Order in Ga2Ge3Se9 Glass: Complementary
Use of X-Rays and Neutrons
JPS Conf. Proc. 33
B-112
S. Hosokawa, et al.
Local- and Intermediate-Range Order inRoom Temperature Superionic Conducting
Ag-GeSe3 Glasses
JPS Conf. Proc. 33
B-113
D. Setoyama, et al.
Non-Destructive 3D Neutron Imaging forPower Electronic Module
JPS Conf. Proc. 33
B-114
Y. Miyazaki, et al.
Observation of Eu Adsorption Band in
the CMPO/SiO2–P Column by Neutron
Resonance Absorption Imaging
JPS Conf. Proc. 33
B-115
Y. Abe, et al.
Visualization of the Boron Distribution
in Core Material Melting and Relocation
Specimen by Neutron Energy Resolving
MethodJPS Conf. Proc. 33
B-116
K. Sakai, et al.
Upgrade History and Present Status of theGeneral Control System for the Materials andLife Science Experimental Facility at J-PARC
JPS Conf. Proc. 33

J-PARC Annual Report 2021

Publications

97
B-117
H. Nakagawa, et al.
Sequence-dependent hydration water
dynamics of dodecameric DNA
JPS Conf. Proc. 33
B-118
M. Takahashi, et al.
Phase Transitions and Atomic Ordering in
Cu–Pd–Fe Ternary Alloys
JPS Conf. Proc. 33
B-119
K. Oikawa, et al.
Microstructure Distribution of Japanese
Sword Cross Sections Analyzed by the
Diffractometer TAKUMI at J-PARC
JPS Conf. Proc. 33
B-120
T. Yamashita, et al.
Neutron Diffraction Mapping Measurement
for Japanese Nails in the Ancient and Present
Days
JPS Conf. Proc. 33
B-121
T. Yamashita, et al.
Stress Partitioning Behavior of Duplex Alloys
Consisting of BCC and FCC Phases at Low
Temperature
JPS Conf. Proc. 33
B-122
T. Nakamura, et al.
A Two-Dimensional Scintillation Neutron
Detector for TAKUMI Diffractometer in
J-PARC MLF
JPS Conf. Proc. 33
B-123
K. Okabe, et al.
High intensity beam studies for the new
MEBT1 design
JPS Conf. Proc. 33 (2021), 011011_1
B-124
K. Yamamoto, et al.
Reliability of J-PARC accelerator system overthe past decade
JPS Conf. Proc. 33 (2021), 011016_1
B-125
N. Hayashi, et al.
High intensity measurement issues at the
J-PARC RCSJPS Conf. Proc. 33 (2021), 011017_1
B-126
H. Hotchi, et al.
1.2-MW-equivalent high-intensity beam
tests in J-PARC RCSJPS Conf. Proc. 33 (2021), 011018_1
B-127
Y. Yoshimoto, et al.
Analysis of J-HBC stripper foil for the J-PARC

RCS
JPS Conf. Proc. 33 (2021), 011019_1
B-128
T. Takayanagi, et al.
Kicker power supply for J-PARC 3-GeV RCS
with SiC-MOSFETJPS Conf. Proc. 33 (2021), 011020_1
B-129
F. Tamura, et al.
Flexible chopper gate pulse generation for
the J-PARC RCSJPS Conf. Proc. 33 (2021), 011021_1
B-130
M. Yamamoto, et al.
Operation experience of Tetrode vacuum
tubes in J-PARC Ring RF system
JPS Conf. Proc. 33 (2021), 011022_1
B-131
J. Kamiya, et al.
Recent status & improvements of the RCS
vacuum system
JPS Conf. Proc. 33 (2021), 011023_1
B-132
P. K. Saha, et al.
Studies of laser power reduction for the laser
stripping of 400 MeV H– beam at J-PARC RCSJPS Conf. Proc. 33 (2021), 011025_1
B-133
H. Harada, et al.
Development of laser system for laser
stripping injection
JPS Conf. Proc. 33 (2021), 011026_1
B-134
H. Harada, et al.
New method for high resolution analysis ofbetatron tune in a rapid cycling synchrotron
or a booster ring
JPS Conf. Proc. 33 (2021), 011027_1
B-135
Y. Kasugai, et al.
Behavior of Tritium Release from a Stainless
Vessel of the Mercury Target as a Spallation
Neutron Source
JPS Conf. Proc. 33 (2021), 011144
B-136
K. Yano, et al.
Precise Neutron Lifetime Measurement
An integration test with a Gaseous and a
Solenoidal Magnet
JPS Conf. Proc. 33(2021), 11117
B-137
K Aizawa, et al.
Kink Deformation Dynamics of LPSO
Alloy from the Experimental Viewpoint ofMultilayer Structure Deformation
Magnesium 2021

B-138
Y. Onuki, et al.
In Situ Neutron Diffraction Measurement
during Bainite Transformation andAccompanying Carbon Enrichment inAustenite at iMATERIA, J-PARC MLF
Materials Science Forum, 1016
B-139
T. Wakui, et al.
New Design of High Power Mercury Target
Vessel of J-PARC
Materials Science Forum, 1024
B-140
T. Naoe, et al.
Effect of Gas Microbubble Injection andNarrow Channel Structure on Cavitation
Damage in Mercury Target Vessel
Materials Science Forum, 1024
B-141
S. Kumano, R. Petti
Possible studies on generalized parton
distributions and gravitational form factors
in neutrino reactions
PoS(NuFact2021) 402, 092 (2022)
B-142
K. Noguchi, et al.
Extinction Measurement at J-PARC MR with
Slow-Extracted Pulsed Proton Beam for
COMET Experiment
PoS(NuFact2021) 402, 104 (2022)
B-143
T. Maruyama on behalf of JSNS2 and JSNS2-II collaborations
The status of JSNS2 and JSNS2-II
PoS(NuFact2021) 402, 159 (2022)
B-144
K. Oishi, et al.
Detector Systems Development for InterBunch Extinction Measurements at the 8
GeV Slow Extracted Pulsed Proton Beam for
the COMET Experiment at J-PARC
PoS(NuFact2021) 402, 216 (2022)
B-145
T. O. Yamamoto, et al.
X-ray spectroscopy experiments on exotic Xi
atoms at J-PARC
PoS(PANIC2021) 380, 211((2022)
B-146
T. Akaishi, et al.
Experimental status toward the direct
lifetime measurement of Hypertriton using
the (K-, pi0) reaction at J-PARC
PoS(PANIC2021) 380, 214 (2022)
B-147
M. Yotsuzuka, et al.
DEVELOPMENT OF BUNCH WIDTH MONITOR
WITH HIGH TIME RESOLUTION FOR LOW
EMITTANCE MUON BEAM IN THE J-PARC

Publications

J-PARC Annual Report 2021

98
MUON g-2/EDM EXPERIMENT
Proc. 12th Int. Particle Acc. Conf.(Internet),
1004-1007(2021)
B-148
Y. Sumi, et al.
BASIC DESIGN STUDY FOR DISK-LOADEDSTRUCTURE IN MUON LINAC
Proc. 12th Int. Particle Acc. Conf.(Internet),
1801-1804(2021)
B-149
Y. Nakazawa, et al.
DEVELOPMENT OF AN APF IH-DTL IN THE
J-PARC MUON g-2/EDM EXPERIMENT
Proc. 12th Int. Particle Acc. Conf.(Internet),
2544-2547(2021)
B-150
Y. Takeuchi, et al.
DEVELOPMENT OF A DISK-AND-WASHERCAVITY FOR THE J-PARC MUON g-2/EDM
ExperimentProc. 12th Int. Particle Acc. Conf.(Internet), 658661(2021)
B-151
B. Yee-Rendon, et al.
Design of the MEBT for the JAEA-ADS Project
Proc. 12th International Particle Accelerator
Conference (IPAC 21), pp. 790-792 (2021)
B-152
B. Yee-Rendon, et al.
Multipacting Studies for the JAEA-ADS Fivecell Elliptical Superconducting RF Cavities
Proc. 12th International Particle Accelerator
Conference (IPAC 21), pp. 793-795, (2021)
B-153
J. Tamura, et al.
Present Status of the Spoke Cavity
Prototyping for the JAEA-ADS Linac
Proc. 20th Int. Conf. on RF Superconductivity(SRF2021)
B-154
Y. Kondo, et al.
DEVELOPMENT OF QWRS FOR THE
FUTURE UPGRADE OF JAEA TANDEM
SUPERCONDUCTING BOOSTER
Proc. 20th Int. Conf. on RF
Superconductivity(internet), 299-301(2021)
B-155
S. Meigo, et al.
Durabilityo of Secondary Electron Emissionfor High-intensity Beam on SiC Wire
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. (Internet),
pp. 296-301 (2021)
B-156
B. Yee-Rendon, et al.
Fast Fault Recovery Scenario for the JAEAADS Linac
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. (Internet),
pp. 61-65 (2021)

B-157
F. Tamura, et al.
Performance of the next-generation LLRF
control system for the J-PARC RCS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. (2021), 170
B-158
T. Nakanoya, et al.
Radiation shielding installation for beam
injection section of 3GeV synchrotron
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. (2021), 238
B-159
K. Yamamoto, et al.
Neutron measurement in the accelerator
tunnel of J-PARC Rapid Cycling Synchrotron
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. (2021), 494
B-160
T. Takayanagi, et al.
LTD semiconductor switch power supply for
J-PARC kicker
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. (2021), 53
B-161
M. Sugita, et al.
Experimental verification of magnetic fieldmeasurement probe for RCS bump magnet
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. (2021), 641

STRUCTURE FOR MUON LINAC
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. 2021, 133(2021)
B-168
R. Kurasaki, et al.
DEVELOPMENT OF A LARGE-DIAMETERPILLOW-SEAL USING WELDED STAINLESSSTEEL PLATES
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. 2021, 243(2021)
B-169
H. Iinuma, et al.
UPDATE AND DETAIL DESIGN OF BEAM
TRANSPORT LINE FOR MUON G-2/EDM
EXPERIMENT AT J-PARC
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. 2021, 267(2021)
B-170
Y. Takeuchi, et al.
DETAILED DESIGN OF THE DISK-ANDWASHER CAVITY FOR MUON LINEAR
ACCELERATOR
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. 2021, 343(2021)

B-162
M. Nomura, et al.
Evaluations with autoencoder whether
the image used for image recognition isappropriate
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. (2021), 80

B-171
K. Aoki, et al.
DESIGN AND FABRICATION OF MAGNETIC
MEASUREMENT SYSTEM WITH HALL
ELEMENTS FOR MUON TRANSPORTSOLENOID OF COMET EXPERIMENT
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. 2021,
458(2021)

B-163
A. Ono, et al.
Development of semiconductor cloverswitch for short-circuit protection of Klystronfor J-PARC accelerator
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. (2021), 831

B-172
R. Muto, et al.
DIFFUSERS FOR LOSS REDUCTION IN SLOWEXTRACTION AT J-PARC MAIN RING
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. 2021, 470(2021)B-164
H. Okita, et al.
Evaluation of the frequency response of the
RF gap voltage monitor of the J-PARC RCS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. (2021), 840

B-173
K. Agari, et al.
ELECTRIC FIELD SIMULATION OF HIGHSENSITIVITY RESIDUAL GAS IONIZATIONPROFILE MONITOR FOR J-PARC HADRONHIGH-P BEAMLINE
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. 2021, 675(2021)B-165
M. Yoshimoto
Initiatives to address the lifetime
improvement of HBC stripper foil for 3GeV
synchrotron of J-PARC
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. (2021), 850
B-166
M. Otani, et al.
MUON ACCELERATOR EXPLORES UNKNOWNELEMENTARY PARTICLE PHYSICS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. 2021, 1(2021)
B-167
K. Sumi, et al.
BASIC DESIGN OF L-BAND DISK-LOADEDB-174
Y. Sato, et al.
NEW CONTROL SYSTEM FOR THE
MAGNET POWER SUPPLIES IN HADRONEXPERIMENTAL FACILITY AT J-PARC
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. 2021, 714(2021)
B-175
H. Watanabe, et al.
DESIGN OF A BEAM WINDOW FOR THE
B-BEAMLINE AT J-PARC HADRON FACILITY
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. 2021, 810(2021)

J-PARC Annual Report 2021

Publications

99
B-176
M. Abe, et al.
UPDATED MAGNETIC DESIGN OF MUON
STORAGE MAGNET FOR G-2/EDM PRECISION
MEASUREMENTS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn. 2021, 835(2021)B-177
A. Toyoda, et al.
DEVELOPMENT OF HIGH SENSITIVITYRESIDUAL GAS IONIZATION PROFILEMONITOR FOR J-PARC HADRON HIGH-P
BEAMLINE (2)Proc. Ann. Mtg. Part. Accel. Soc. Jpn. 2021, 866(2021)
B-178
M. Otani, et al.
MUON ACCELERATOR EXPLORES UNKNOWNELEMENTARY PARTICLE PHYSICS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 1 (2021)
B-179
F. Tamura, et al.
PERFORMANCE OF THE NEXT-GENERATIONLLRF CONTROL SYSTEM FOR THE J-PARC RCS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 170 (2021)
B-180
Y. Kawabata, et al.
PROGRESS OF J-PARC MR DISASTER
PREVENTION SYSTEM
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 18 (2021)
B-181
T. Yasui, et al.
COMPENSATION OF THIRD-ORDERSTRUCTURE RESONANCES IN J-PARC MR
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 198 (2021)
B-182
K. Akutsu, et al.
Development of new waterproof thinｰlayers
for the magnetic alloy core: structural studies
using neutron reflectometry
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 2021
B-183
Y. Kurimoto
Modeling of Image Current for 2.5
Dimensional PIC Simulations
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 203 (2021)
B-184
K. Shinto, et al.
Effect of an 2-MHz RF source on the H- beam
extracted from an rf-driven high-intensity
H- ion source
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 230 (2021)
B-185
T. Nakanoya, et al.
Radiation shielding installation work for
3GeV synchrotron injection section
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 238 (2021)

B-186
T. Shibata, et al.
THE NEW LOW-FIELD SEPTUM MAGNET FOR
UPGRADING OF FAST EXTRACTION IN MR
J-PARC(7)Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 262 (2021)

B-196
S. IWATA, et al.
RESEARCH ON THE PLACEMENT OF EDDYSEPTUM MAGNETS AND FAILURE IN J-PARC
MR FAST EXTRACTION
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 461 (2021)

B-187
M. Furusawa, et al.
REPAIRMENT OF A TRANSFORMER-RECTIFIERUNIT AND INSTALLATION INTO THE NEW RFSYSTEM IN J-PARC MR-RF
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 283 (2021)

B-197
Ryotaro MUTO, et al.
DIFFUSERS FOR LOSS REDUCTION IN SLOWEXTRACTION AT J-PARC MAIN RING
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 470 (2021)

B-188
A. Kobayashi, et al.
EVALUATION AND COUNTERMEASURES FOR
IMPEDANCE OF FAST EXTRACTION SEPTAAND FAST EXTRACTION KICKERS AT THE
J-PARC MAIN RING
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 287 (2021)
B-189
A. Kobayashi, et al.
Evaluation and countermeasures for
impedance of fast extraction septa and fast
extraction kickers at the J-PARC main ring
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 287-291(2021).
B-190
S. Meigo, et al.
Durability of secondary electron emission for
high-intensity beam on SiC wire
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 296 (2021)
B-191
Yusuke Takeuchi, et al.
DETAILED DESIGN OF THE DISK-ANDWASHER CAVITY FOR MUON LINEAR
ACCELERATOR
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 343 (2021)
B-192
K. Futatsukawa, et al.
Development of DFB・DFF system for
J-PARC Linac LLRF
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 371 (2021)
B-193
Takanori SHIBATA, et al.
SYNCHRONIZATION SYSTEM OF ION SOURCE
RF AND CAVITY RF IN J-PARC LINAC
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 417 (2021)
B-194
Y. Morita, et al.
DESIGN OF OUTPUT FILTER RESISTORSBASED ON PULSE LOAD CAPABILITY FOR
J-PARC MR MAIN MAGNET POWER SUPPLY
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 439 (2021)
B-195
T. Asami, et al.
EVALUATION OF THE EFFECTS OF EDDYCURRENTS ON VACUUM DUCTS IN J-PARC MR
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 454 (2021)

B-198
Y. Hashimoto, et al.
DEVELOPMENT OF A WIDE DYNAMIC-RANGEBEAM PROFILE MONITOR USING OTR AND
FLUORESCENCE FOR INJECTED BEAMS IN
J-PARC MAIN RING (2)Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 481 (2021)
B-199
K. Yamamoto, et al.
Neutron measurement in the accelerator
tunnel of J-PARC Rapid Cyclyng Synchrotron
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 494 (2021)
B-200
T. Takayanagi, et al.
LTD semiconductor switch power supply for
J-PARC kicker
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 53 (2021)
B-201
M. Sugita, et al.
Experimental verification of magnetic fieldmeasurement probe for RCS bump magnet
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 641 (2021)
B-202
P. K. Saha, et al.
RECENT PROGRESS OF LASER STRIPPING POP
DEMONSTRATION STUDY AT J-PARC RCS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 656 (2021)
B-203
P. K. Saha, et al.
RECENT PROGRESS OF LASER STRIPPING POP
DEMONSTRATION STUDY AT J-PARC RCS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 656-660(2021).
B-204
Y. Sugiyama, et al.
BUNCH MANIPULATION BEFORE THE
EXTRACTION BY A SECOND HARMONICS
SUPERPOSITION AT THE J-PARC MR
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 66 (2021)
B-205
M. Tomizawa, et al.
ELECTROSTATIC SEPTUM ACCIDENT AND
RECOVERY BY A QUADRUPOLE POWER
SUPPLY TRIP IN THE STRAIGHT SECTIONS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 661 (2021)

Publications

J-PARC Annual Report 2021

100
B-206
T. Toyama, et al.
Evaluation by causality for measurement
data of longitudinal coupling impedanceswith stretched-wire method
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 666-669(2021).
B-207
N. Hayashi, et al.
Analysis of Machine Protection System
events in the J-PARC Linac/RCS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 679 (2021)
B-208
N. Hayashi, et al.
ANALYSIS OF MACHINE PROTECTIONSYSTEM EVENTS IN THE J-PARC LINAC/RCS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 679-682(2021).
B-209
S. Mizobata, et al.
OVERVIEW OF CAPACITOR BANKMONITORING SYSTEM FOR HIGH VOLTAGE
SUPPLY FOR J-PARC KLYSTRON
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 742 (2021)
B-210
Y. Shobuda, et al.
Titanium nitride-coated ceramic break forwall current monitors with an improved
broadband frequency response
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 75-79(2021)
B-211
T. Shibata, et al.
THE NEW HIGH-FIELD SEPTUM MAGNET FOR
UPGRADING OF FAST EXTRACTION IN MR
J-PARC(3)Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 826 (2021)
B-212
Y. Lee, et al.
DEVELOPMENT OF AN OPTIMIZATIONALGORITHM FOR BEAM PROFILEMEASUREMENT USING MULTIPLE
16-ELECTRODE BPMS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 83 (2021)
B-213
A. Ono, et al.
Development of semiconductor cloverswitch for short-circuit protection of klystronfor J-PARC accelerator
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 831 (2021)
B-214
H. Okita, et al.
EVALUATION OF THE FREQUENCY RESPONSE
OF THE RF GAP VOLTAGE MONITOR OF THE
J-PARC RCS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 840 (2021)
B-215
M. Yoshimoto, et al.

Initiatives to address the lifetime
improvement of HBC stripper foil for 3GeV
synchrotron of J-PARC
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 850 (2021)
B-216
H. Takahashi, et al.
Update of MPS modules for J-PARC Linac and
RCS (2)
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 914 (2021)
B-217
H. Takahashi, et al.
Update of MPS modules for J-PARC linac and
RCS, 2
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 914-917(2021).
B-218
K. Futatsukawa, et al.
PRESENT STATUS OF J-PARC LINAC LLRF
SYSTEM
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 937 (2021)
B-219
Y. Kurimoto
STUDY ON USAGE OF ELECTRON LENS FORHIGH INTENSITY PROTON RINGS
Proc. Ann. Mtg. Part. Accel. Soc. Jpn., 995 (2021)
B-220
K. Shinto, et al.
Effect of a 2-MHz RF source on the H- beam
extracted from an rf-driven high-intensity
H- ion source
Proc. Ann. Mtg. PASJ (Internet), 230-233 (2021)
B-221
K. Hirano, et al.
RF dielectric properties of alumina ceramics
for L-band RF window
Proc. Ann. Mtg. PASJ (Internet), 276-278 (2021)
B-222
Y. Sato, et al.
Analysis of the J-PARC linear accelerator RF
down phenomena 2
Proc. Ann. Mtg. PASJ (Internet), 924-928 (2021)
B-223
Y. Yamaguchi, et al.
Beam loss monitor using nuclear reaction
with high threshold-energy in the vicinity of
J-PARC muon target
Proc. Ann. Mtg. PASJ(Internet), 486-490(2021)
B-224
M. Tomizawa, et al.
Slow Extraction Operation at J-PARC Main
Ring
Proc. HB'21, Batavia, IL, USA, Oct. 2021, pp.
219-224
B-225
I. Yamada, et al.
MEASUREMENT AND RECONSTRUCTION
OF A BEAM PROFILE USING A GASSHEET MONITOR BY BEAM-INDUCEDFLUORESCENCE DETECTION IN J-PARC
Proc. IBIC2021, 168 (2021)
B-226
Y.i Hashimoto, et al.
DEVELOPMENT OF A PROFILE MONITOR
USING OTR AND FLUORESCENCE FORINJECTED BEAMS IN J-PARC MAIN RING
Proc. IBIC2021, 263 (2021)
B-227
M. Yang, et al.
DEVELOPMENT OF TIMING READ-BACKSYSTEM FOR STABLE OPERATION OF J-PARC
Proc. ICALEPCS2021, 927 (2021)
B-228
K. Nakayoshi, et al.
Development of a Voltage Interlock System
for Normal-Conducting Magnets in the
Neutrino Experimental Facility at J-PARC
Proc. ICALEPCS'21, Shanghai, China, Oct. 2021,
pp. 738-741
B-229
R. Matsushita, et al.
DEVELOPMENT OF PULSED BEAM SYSTEMFOR THE THREE DIMENSIONAL SPIRALINJECTION SCHEME IN THE J-PARC MUON
g-2/EDM EXPERIMENT
Proc. IPAC, Vol 2021, 809(2021)
B-230
M. Yotsuzuka, et al.
DEVELOPMENT OF BUNCH WIDTH MONITOR
WITH HIGH TIME RESOLUTION FOR LOW
EMITTANCE MUON BEAM IN THE J-PARC
MUON g-2/EDM EXPERIMENT
Proc. IPAC2021, 1004 (2021)
B-231
K. Sumi, et al.
BASIC DESIGN STUDY FOR DISK-LOADEDSTRUCTURE IN MUON LINAC
Proc. IPAC2021, 1801 (2021)
B-232
M. Yamamoto, et al.
VACUUM TUBE OPERATION TUNING FOR A
HIGH INTENSITY BEAM ACCELERATION IN
J-PARC RCS
Proc. IPAC2021, 1884 (2021)
B-233
K. Ishii, et al.
DEVELOPMENT OF DISASTER PREVENTIONSYSTEM FOR ACCELERATOR TUNNEL
Proc. IPAC2021, 2228 (2021)
B-234
Y. Nakazawa, et al.
DEVELOPMENT OF AN APF IH-DTL IN THE
J-PARC MUON g - 2/EDM EXPERIMENT
Proc. IPAC2021, 2544 (2021)

J-PARC Annual Report 2021

Publications

101
B-235
H. Okita, et al.
CONSIDERATION OF TRIPLE-HARMONICOPERATION FOR THE J-PARC RCS
Proc. IPAC2021, 3020 (2021)
B-236
F. Tamura, et al.
NON-ADIABATIC LONGITUDINAL BUNCH
MANIPULATION AT FLATTOP OF THE J-PARC
MR
Proc. IPAC2021, 3023 (2021)
B-237
K. Yamamoto
RECENT STATUS OF J-PARC RAPID CYCLINGSYNCHROTRON
Proc. IPAC2021, 3027 (2021)
B-238
R. Muto, et al.
SIMULATION STUDY ON DOUBLE DIFFUSER
FOR LOSS REDUCTION IN SLOW EXTRACTION
AT J-PARC MAIN RING
Proc. IPAC2021, 3069 (2021)
B-239
S. Iwata, et al.
LAYOUT OF THE NEW SEPTUM MAGNETSFOR FAST EXTRACTION IN J-PARC MAIN RING
Proc. IPAC2021, 3103 (2021)
B-240
Y. Shobuda, et al.
A POSSIBLE MODIFICATION OF CERAMICCHAMBERS IN THE INJECTION AREA AT THE
RCS IN J-PARC
Proc. IPAC2021, 3205 (2021)
B-241
E. Cicek, et al.
A RECENT UPGRADE ON PHASE DRIFTCOMPENSATION SYSTEM FOR A STABLE
BEAM INJECTION AT J-PARC LINAC
Proc. IPAC2021, 3357 (2021)
B-242
M. Otani, et al.
SIMULATION OF IMAGING USINGACCELERATED MUON BEAMS
Proc. IPAC2021, 3740 (2021)
B-243
T. Asami, et al.
A SIMULATION STUDY OF BEAM PIPE EDDYCURRENT EFFECTS ON BEAM OPTICS
Proc. IPAC2021, 4288 (2021)
B-244
T. Yasui, et al.
COMPENSATIONS OF THIRD-ORDERRESONANCES IN J-PARC MR
Proc. IPAC2021, 744 (2021)
B-245
Y. SatoUpgrading J-PARC Accelerator for Hyper-

Kamiokande Project
Proc. IPAC2021, wexb02 (2021)

Proc. of 12th International Particle Accelerator
Conference, 590-593 (2021)

B-246
M. Yotsuzuka, et al.
Development of Bunch Width Monitor withHigh Time Resolution for Low Emittance
Muon Beam in the J-PARC Muon g-2 / EDM
ExperimentProc. IPAC'21, Campinas, SP, Brazil, May 2021,
pp. 1004-1007

B-255
G. Ichikawa, et al.
Neutron lifetime experiment with pulsed
cold neutrons at J-PARC
Proc. of Science, Vol PANIC2021, 457(2021)

B-247
Y. Fukao, et al.
Construction Status of the COMET
Experimental Facility
Proc. IPAC'21, Campinas, SP, Brazil, May 2021,
pp. 1907-1909
B-248
M. A. Rehman, et al.
The First Trial of XY-Coupled Beam Phase
Space Matching for Three-Dimensional
Spiral Injection
Proc. IPAC'21, Campinas, SP, Brazil, May 2021,
pp. 553-556
B-249
Y. Takeuchi, et al.
Development of a Disk-and-Washer Cavity
for the J-PARC Muon g-2/EDM ExperimentProc. IPAC'21, Campinas, SP, Brazil, May 2021,
pp. 658-661
B-250
K. Oda, et al.
Developments of a Pulse Kicker System for
the Three-Dimensional Spiral Beam Injectionof the J-PARC Muon g-2/EDM ExperimentProc. IPAC'21, Campinas, SP, Brazil, May 2021,
pp. 726-729
B-251
T. Kume, et al.
Evaluation of the Free Spectral Range of an
Etalon by Referring an Optical Frequency
Comb
Proc. LEM
B-252
J. Kamiya, et al.
Some methods of making titanium vacuum
chamber act as getter pump for UHV/XHV
Proc. of 12th International Particle Accelerator
Conference (2021) 3471
B-253
Y. Shobuda, et al.
A Possible modification of ceramic chambersin the injection area at the RCS in J-PARC
Proc. of 12th International Particle Accelerator
Conference, 3205-3208 (2021)
B-254
P. K. Saha, et al.
Foil Hits Reduction by Minimizing Injection
Beam Size at the Foil in J-PARC RCS

B-256
T. Mogi, et al.
Improvement of systematic uncertainties forthe neutron lifetime experiment at J-PARC
Proc. of Science, Vol PANIC2021, 458(2021)
B-257
K. Yano, et al.
Precise Neutron Lifetime Measurement:
An Integration Test with a Gaseous and a
Solenoidal Magnet
Proc. of the 3rd J-PARC Symposium(J-PARC2019), JPS Conf. Proc., 33
B-258
S. Imajo, et al.
Ultracold Neutron Time Focusing Experimentand Performance Evaluation of an Improved
UCN Rebuncher at J-PARC/MLF
Proc. of the 3rd J-PARC Symposium(J-PARC2019), JPS Conf. Proc., 33
B-259
N. Sumi, et al.
Precise Neutron Lifetime Measurement
Using Pulsed Neutron Beams at J-PARC
Proc. of the 3rd J-PARC Symposium(J-PARC2019), JPS Conf. Proc., 33
B-260
N. Yamamoto, et al.
Development of Pulsed NeutronInterferometer
Proc. of the 3rd J-PARC Symposium(J-PARC2019), JPS Conf. Proc., 33
B-261
M. Hiromoto, et al.
Proof-of-principle Experiment for the Studyof a New Intermediate-range Interaction
Using Coherent Neutron Scattering
Proc. of the 3rd J-PARC Symposium(J-PARC2019), JPS Conf. Proc., 33
B-262
K. Haga, et al.
DEVELOPMENT OF THE HIGH-POWER
SPALLATION NEUTRON TARGET OF J-PARC
Proc. The 19th International Topical Meetingon Nuclear Reactor Thermal Hydraulics(NURETH-19), Log nr.: 3392
B-263
F. Funama, et al.
A study of Focusing TOF-MIEZE
Spectrometer with Small-angle Neutron
Scattering
Proc. The Physical Society of Japan ConferencePublications

J-PARC Annual Report 2021

102
Proceeding, 33
B-264
S. Kumano, Q.-T. Song
Possible studies of gluon transversity inthe spin-1 deuteron at hadron-accelerator
facilities
SckiPost Phys. Proc. 8, 100 (2022)

B-265
S. Kumano, Q.-T. Song
Transverse-momentum-dependent parton
distribution functions for spin-1 hadrons
SckiPost Phys. Proc. 8, 174 (2022)

KEK Reports
C-001
Safety Division, J-PARC Center
Annual Report on the Activities of Safety in
J-PARC, FY2020
KEK Internal 2021-005

C-002
M. A. Rehman, et al.
THE FIRST TRIAL OF XY-COUPLED BEAM
PHASE SPACE MATCHING FOR THREEDIMENSIONAL SPIRAL INJECTIONKEK Preprint 2021-17

C-003
S. Igarashi, et al.
Accelerator technical design report for 1.3
MW operation at J-PARC Main Ring
KEK Report 2021-2

D-003
A. Ono, et al.
Proposal of safe and secure maintenancemethod to realize long-term stable
operation of electromagnet power supply
JAEA-Technology 2021-005(2021)

D-005
T. Nakanoya, et al.
Report of the design examination and theinstallation work for the radiation shieldat the beam injection area in the 3 GeV
synchrotron
JAEA-Technology 2021-019(2021)

JAEA Reports
D-001
Safety Division, J-PARC Center
Annual Report on the Activities of Safety in
J-PARC, FY2020
JAEA-Review 2021-057(2021)
D-002
A. Ono, et al.
Construction of a design model for anelectromagnet power supply with safety andreliability in the accelerator
JAEA-Technology 2020-023(2021)

OthersE-001
JVSS (N. Yamada)
中性子反射率法 (only Japanese)
図説 表面分析ハンドブック (only Japanese)

D-004
K. Takano, et al.
Noise countermeasures for invertercontrolled multi-stage roots vacuum pumpsin J-PARC LINAC L3BT
JAEA-Technology 2021-017(2021)

D-006
K. Yamaki, et al.
Development of Logging Data Processing
Tool for Lead-bismuth Experimental Devices
JAEA-Technology 2020-021 (2021)

J-PARC Annual Report 2021
Vol.1: Highlight© J-PARC Center
December 2022

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