ANNUALREPORT2 O 2 2
Vol.1: HighlightEditorial Board (April 2023 – March 2024)

Yong LIU (Accelerator Division)

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

Masami IIO (Cryogenics Section)

Shigeru SAITO (Transmutation Division)

Fumihiro MASUKAWA (Safety Division)

Masatoshi TSUKADA (Users Office Team)

Narumi SUGIYAMA (Public Relations Section)

Cover photographs
Photograph ① : Do specular reflection images in quadrupole magnet ducts dream of ray tracing?
Image credit: Masahiko UOTA

Photograph ② : The art inside the ion pump
Image credit: Masahiko UOTA

Photograph ③ : Large aerogel Cherenkov detector under construction
Image credit: Takeshi YAMAMOTO

J-PARC Annual Report 2022
Contents
Preface……………………………………………………………………………………………………………… 1
Accelerators………………………………………………………………………………………………………… 3
Overview of the Accelerator…………………………………………………………………………………… 3
Linac ………………………………………………………………………………………………………… 5
RCS…………………………………………………………………………………………………………… 8
MR………………………………………………………………………………………………………… 11
Materials and Life Science Experimental Facility………………………………………………………………… 15
Overview…………………………………………………………………………………………………… 15
Neutron Source Section…………………………………………………………………………………… 16
Neutron Science Section…………………………………………………………………………………… 17
Neutron Instrumentation Section………………………………………………………………………… 18
Muon Section……………………………………………………………………………………………… 19
Technology Development Section………………………………………………………………………… 21
Particle and Nuclear Physics……………………………………………………………………………………… 23
Neutrino Experimental Facility……………………………………………………………………………… 23
Hadron Experimental Facility (HEF)………………………………………………………………………… 24
Particle and Nuclear Physics Experiments at MLF ………………………………………………………… 25
Theory group……………………………………………………………………………………………… 26
Technical Support Group (Esys-Tokai)……………………………………………………………………… 26— Research Highlight —Mass and Width of the Λ(1405) Hyperon Resonance……………………………………………………… 27
Cryogenics Section ……………………………………………………………………………………………… 29
Overview…………………………………………………………………………………………………… 29
Cryogen Supply and Technical Support…………………………………………………………………… 30
Superconducting Magnet System for T2K………………………………………………………………… 30
Superconducting Magnet Systems at the MLF…………………………………………………………… 31
Superconducting Magnet Systems at the HEF …………………………………………………………… 31
R&D for the Future Projects at J-PARC……………………………………………………………………… 32
Information System……………………………………………………………………………………………… 35
Overview…………………………………………………………………………………………………… 35
Status of Networking……………………………………………………………………………………… 35
Internet Connection Services for Visitors and Public Users of J-PARC……………………………………… 38
Status of Computing ……………………………………………………………………………………… 38

Transmutation Studies…………………………………………………………………………………………… 41
Overview…………………………………………………………………………………………………… 41
Research and development ……………………………………………………………………………… 42
International and Domestic Cooperation ………………………………………………………………… 45
Safety ……………………………………………………………………………………………………………… 47
Safety……………………………………………………………………………………………………… 48
User Service ……………………………………………………………………………………………………… 51
Users Office (UO)…………………………………………………………………………………………… 52
User Statistics……………………………………………………………………………………………… 54
MLF Proposals Summary - FY2022………………………………………………………………………… 55
J-PARC PAC Approval Summary for the 2022 Rounds……………………………………………………… 57
Organization and Committees…………………………………………………………………………………… 61
Organization Structure……………………………………………………………………………………… 62
Members of the Committees Organized for J-PARC………………………………………………………… 63
Main Parameters ………………………………………………………………………………………………… 69
Events ……………………………………………………………………………………………………………… 71
Events……………………………………………………………………………………………………… 71
Publications……………………………………………………………………………………………………… 79
Publications in Periodical Journals………………………………………………………………………… 80
Conference Reports and Books…………………………………………………………………………… 90
KEK Reports………………………………………………………………………………………………… 95
JAEA Reports……………………………………………………………………………………………… 96
Others……………………………………………………………………………………………………… 97

J-PARC Annual Report 2022

Preface1

Preface
In Japanese fiscal year (JFY) 2022, from April 2022 through March 2023, we
made great progress at J-PARC on many fronts and a few of our achievements arecovered below.
We succeeded in delivering 830kW stable beam to the MLF at a very highavailability of about 96%. A major challenge in JFY2022 was the soaring electricity
prices, which initially hindered to plan 7.2 cycle operation for the MLF within the
allocated budget. However, the allocation of a supplementary budget to offset thePreface

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2

increased electricity costs, enabled us to restore the operation back to 6.6 cycles,
92% of 7.2 cycles, which allowed the execution of 418 general user experiments.
The major upgrade of the MR for higher beam power was completed in
JFY2021, with its commissioning scheduled for JFY2022. However, initial failuresin the upgraded components significantly reduced the beam time for the beamcommissioning.
A major milestone achieved in the HD experimental facility was thecompletion of the C-line for the COMET experiment after long preparation. By
the end of JFY2022, we successfully commissioned the slow extraction beam andbunched slow extraction at 8GeV in the C-line. At the same time, the upgradeof the neutrino beam facility to achieve a higher beam power upto 1.3MW for
the HyperKamiokande project is ongoing. One of the most important scientificachievements from the particle and nuclear physics experiments was the resultsfrom E40 experiment on hyperon - proton scattering, which reveal insights into
the nature of the strong force acting between nucleons at short distances.
In this volume, we report the progress made at J-PARC in JFY2022.

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) anda Main Ring Synchrotron (MR, 30 GeV). The proton beamfrom the RCS is delivered to the Materials and Life Science
Experimental Facility (MLF) for neutron and muon 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) and slow extraction(SX) mode for the Hadron experimental facility (HD).

The operation in Japanese fiscal year (JFY) 2022 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#89,
which started in the middle of January 2022 continued
until the end of April on schedule. The beam power
for the Materials and Life Science experimental facility(MLF) user program increased from 720 kW to 830 kW.

Fig. 1. Accelerator operation in JFY2022.

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After almost a ten-day shutdown at the beginningof May, the user program resumed for the MLF at 830
kW beam power on May 11. However, the beam power
for the MLF user program had to be reduced from 830
kW to 770 kW from June 7 due to insufficient cooling
capacity of the cooling water system of the RCS in summer. The MLF user program has been performed onschedule until June 24, before the summer shutdown.
The user program for the MLF resumed on schedule at 800kW beam power, which was almost the samevalue as the power before the summer shutdown, as
an operation run of Run#90 on November 21. This program has been performed on schedule until March 15,2023, with a New Year’s break of about two weeks in the
middle.
The MLF operation statistics for JFY2022 (from April
2022 to March 2023) are shown in Table 1. The net user
operation hours and the beam availability rate for the
MLF facility were as follows: 3,440 hours (96.0%). Thesestatistics show that the linac, and the RCS operated withhigh availabilities.
Figure 3 shows the number of stop events and stoptime by components in JFY2022. 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.
For the linac, HVDC were still dominant. The RCS
outage was mainly due to RF. The RF outage was notdue to the cavity, but to the failure of the capacitor, thelife of the vacuum tube in the amplifier and transformer

rectifier. There were three main causes of the MR downtime events, which were the trouble of the power
supply of the BM and the QM and beam fast extraction
magnets.
(2) The MR upgrade work and beam operation
The MR upgrade work had been performed since
July 2021. Manufacture of new power supplies for themain magnets (BM and QM), new 2nd harmonic RF system, and new injection and extraction magnets and soon were scheduled during this upgrade work. This work
should have been completed by the end of May 2022,
but it was not completed as scheduled, specifically, thetuning of the new power supplies for the main magnets
was delayed due to failures that occurred twice, in May
and June. Beam commissioning, scheduled from June 1
before the summer shutdown, was delayed by about amonth, reducing its duration from a month to almost aweek due to these power supply failures.
Beam commissioning, scheduled from the middleof November after the summer shutdown, was alsodelayed by two months due to failure of the new power
supply for the main magnet, and coil failure of the septum magnet for the fast beam extraction magnet. As
response emergency measures for this magnet failure,
the coil joints of the same type of electromagnet were
reinforced and partially repaired electromagnets werereinstalled. The MR beam operations in February andMarch were a combination of slow beam extraction
adjustment and COMET operation 8GeV pattern.

Fig. 2. Beam power and operation statistics in hours for the MLF user operation in JFY2022.

J-PARC Annual Report 2022

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Fig. 3. Number of stop events and stop time by components in JFY2022.

Linac

Fig. 4. Operation history of the ion source in FY2022.

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 FY2021, was also
kept during FY2022 at the linac. The beam studies havebeen conducted to resolve some issues, such as thebeam loss mitigation and confirmation of feasibility forfurther high intensity operation due to the demand ofdownstream facilities.
Accelerator components status
The operation history of the ion source in FY 2022
is shown in Fig. 4. Presently, the ion source is being
operated at the H- beam with a peak current of 60 mA
for the user operation. Before the winter shutdown,
the ion source extracted more than 72 mA beams forhigh-intensity beam study. Figure 5 shows the history of the continuous operation time and the beam
current increase of the RF ion source (from 2014). The

replacement cycle has been gradually extended withincreased operational experience. In RUN#89 (January2022 – July 2022), the continuous operation time of
the ion source has been extended to 4,001 hours (5.5months), which was 350 hours longer than the previous record (3,651 hours in the RUN#86). As the lifetimeof the ion source is mainly limited by the failure of theFig. 5. H
 istory of the continuous operation time of the RF ion
source.

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RF antenna coil installed in the source chamber, dimension measurements and SEM/EDS analyses were applied
to understand the surface discoloration of the antenna.
No cracks, no pinholes and little variation in the enamel
coating thickness on the antenna surface were observed.
The discoloration after the long-term continuous operation is due to the deposition of injected cesium andcompositions of stainless steels (Fe, Cr, Ni) used for theion source components sputtered by plasma. The results
show that the enamel coating of the antenna has notbeen worn out in the continuous operation for several
months and that the ion source’s continuous operation period can be extended more. On the other hand,the sputtering of the stainless steel is a serious issue
for the stable plasma operation. The development of
a new plasma chamber is proceeding to prevent the
sputtering rate. The final goal is to achieve continuous
operation over 7 months, approaching the full J-PARC
user operation period in one year.
The RFQ trip rate has been approximately 10 times
per day at 25 Hz beam operation to the MLF in FY2022.
This situation is almost the same as before. An autorestart system for the RFQ trip has been running for three
years. The system resumes the beam at the next macropulse after the RFQ trip. Also, the beam stop associatedwith the RFQ trips (e.g., MPS by the beam loss downstream) occurs approximately once every 2 days.
RF trips due to the discharge have frequently
occurred in DTL3 since the summer maintenance in
2022. The vacuum pressure in the cavity deteriorated
when tripped, and a CCD camera attached to the viewport in front of the RF coupler confirmed that light wasemitted near the ceramic window of the RF coupler. This
indicates that the cause of the DTL3 trip is the discharge
at the vacuum-side surface of the ceramic window. Highpower conditioning was conducted at first and recovery
was observed, however, it was temporary. Therefore,
the ceramic window of DTL3 was replaced with a new
one during the spring maintenance period at the endof March 2023. Multiple paired discharge marks wereobserved on the surface of the removed ceramic window
and on the vacuum seal. After the replacement, almost
no DTL3 trips due to thedischarge were observed.
After the Great East Japan Earthquake in 2011, we
could not operate with the design rf power in some
SDTL cavities due to the multipactor effect. To solve
the problem, we performed acetone or acid cleaningon these cavities several times. In the 2021 summer
maintenance, the SDTL05A cavity was cleaned by dilutehydrochloric acid. Since then, the unstable region

disappeared for more than a year. Also, SDTL04A andSDTL04B were unstable near the operating power
region, therefore acid cleaning was performed onthese cavities in the 2022 summer maintenance period.
Increase in the RF reflections due to multipactor has notbeen observed in these two cavities since then. Afterthe 2022 summer maintenance, all SDTL cavities areoperating at the designed operating power stably.
The operation of the ACS cavities was more stable
than that of the other accelerator sections. The numberof trips of all the ACS cavities was less than once per day.
RF system status
We have been handling two types of klystrons,
such as a 324-MHz klystron and a 972-MHz one. Due todecrease in electric breakdown voltage, one 972-MHz
klystron was replaced in March 2023. The operation
time of the klystrons as of the end of March 2023 isshown in Fig. 6. Among a total of twenty 324-MHz klystrons, six of them reached more than 87,000 hours ofoperation, which corresponds to the entire period since
the linac operation was started. Most of the 972-MHz
klystrons reached more than 56,000 hours of operation.

Fig. 6. T he operation time of the 324-MHz klystron (top) and972-MHz klystron (bottom) as of the end of March
2023.

J-PARC Annual Report 2022

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Beam monitor status
It is important to measure and adjust the beamprofile not only in the transverse direction but also in
the longitudinal one to produce a stable beam withminimal beam loss. We have been developing a bunchshape monitor (BSM), which measures a longitudinal beam profile. Several BSMs have been installed in
the Linac. The BSM at MEBT1 uses a highly oriented
pyrolytic graphite (HOPG) as the secondary electron
emission target. The HOPG-BSM enables a longitudinal
profile measurement of a 3 MeV beam without breaking
the target due to its high thermal conductivity. The longitudinal profile measurement of high-power beams,
such as peak current of 55 mA and macrobunch lengthof 100 ms, has been continuously performed. The longitudinal beam parameters evaluated offline from the
BSM data agreed with the simulation results of a threedimensional particle-in-cell code. We will improve theanalysis method to estimate the beam parameters
in a short time to use the BSM data for online beamcommissioning.
Another BSM is installed in the MEBT2. This BSM
played an important role in identifying the origin of alarge beam loss at L3BT in beam commissioning. Thatbeam loss was not caused by the transverse beam profile problem. The BSM showed the distortion at the
beginning of the macrobunch as shown in Fig. 7. This
beam abnormality was found to have originated fromthe inadequate feedforward setting. The BSM has beeneffectively used to detect beam anomalies.
Another progress of the beam monitor is themomentum correction system with beam position
monitor (BPM), which has been successfully operated
for years. The beam loss occurred at the dispersion peak
point of the RCS and 3-50 BT during the user operation.
This was caused by the drift of the beam momentum,
whose origin was the dependence of the accuracy of
the LLRF control devices on the humidity fluctuations.

Fig. 7. T he longitudinal beam profile measured by the BSM in
MEBT2. Distortion in the beginning of the macrobunch
was observed.

Therefore, a feedback system was constructed to constantly monitor the momentum using the BPM andto correct the phase of the end-stage of the acceleration cavity to eliminate the momentum drift when it
occurred. The beam momentum has been very stablesince this monitoring-correction system was introduced
and later, the LLRF devices were placed in the chamberswith constant temperature and humidity.
Beam study
In JFY2022, our work focuses on improving theunderstanding of beam property and exploringlinac output beam stability. Machine learning (ML)is introduced in J-PARC to improve the accelerator
performance.
As a first trial example in the J-PARC linac, a DNN(Deep-Learning Neural Network) model is trained with
sufficient simulation data for the beam phase responseto the RF cavity errors, as shown in the upper part of
Fig. 8, which can successfully surrogate the physics
process. The DNN model calibrated with the measured
data shown in the lower part of Fig. 8 will be applied forcompensating the RF errors.
Preliminary studies have shown that a DNN-based
correction scheme can improve the linac output
momentum stability by several times from the present
rate of 0.01% according to the present RF design tolerance into less than ± 0.001%. Further beam study isplanned to verify this result.
A subsequent study aimed at understanding andimproving beam properties involved beam measurements at the most upstream beam transport line,
MEBT1. This is essential since an increase in emittancehas been observed during the operation of the DTL

Fig. 8. P reparation and training result of ML-DNN model of
RF error and beam phase response (upper), and measured data (lower).

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J-PARC Annual Report 2022

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accelerator, which is installed post-MEBT1. The beamphase space was measured using the so-called Q-scanmethod using a wire scanner monitor and a quadrupole magnet located in MEBT1. Figure 9 presents boththe measured and simulated results in the x-direction(left) and y-direction (right). The measured profile widthaligns well with the simulation, and the observed emittances are consistent within the anticipated parameters.
Moreover, the beam emittance showed stability, varying by only a few percent during the measurement
period. Based on these findings, the beam dynamics
within the DTL are currently under investigation.
Considerable efforts have been dedicated to loss
mitigation. Besides the loss in the linac, the beam outside the RCS RF bucket (called extinction) has been

identified as one of the primary sources of loss at RCS,
which necessitates investigation prior to injecting beam
to RCS. A measurement method for the extinction wasdeveloped, utilizing a stopper in the 2nd medium beamtransport line (MEBT2) within the linac. Here, the corresponding beam is halted by the stopper, allowing
for the measurement of the ensuing loss signal. This
loss signal has been calibrated with the actual loss at
RCS (see Fig. 10, left), revealing a strong correlation
between them. Additionally, the dependence of theextinction on the buncher strength installed at MEBT1
was assessed, as shown in Fig. 10 (right). This analysis
indicates that the extinction can be adjusted to meetthe requirements by modulating the buncher strength.

Fig. 9. Measured and simulated beam profile width.

Fig. 10. L oss signal due to the stopper in linac vs loss signal in RCS (left). dependence of the extinction to thebuncher strength (right).

RCS
Operational status
The MLF user operation started at a beam power of
700 kW in JFY 2022, which was increased to 800 kW in
April 2022. Thereafter, the beam current was maintained,
but the total number of protons on the neutron target
was effectively reduced due to the shortened cycle ofthe MR operation. To increase the beam power in MR,
the power supplies of the MR magnet system were
replaced and the MR operation cycle for the fast extraction mode was reduced from 2.48 to 1.36 s. This shorter
MR cycle reduced the operation duty of the MLF from58/62 (~93.5%) to 30/34 (~88.2%), and thus, the numberof protons on the neutron target was practically reducedby this factor. Finally, the beam power of the MLF has
been maintained at 800 kW up until JFY 2023.
As a matter of fact, one of the transformer-rectifierassemblies of the RF system ceased operation in June
2022. Subsequently, only 11 RF cavities have been operated and 800 kW beams were still achievable under thiscondition. Conversely, the maximum output beam powerhas been limited due to this failure. Figure 11 shows thechanges in the RCS output power with respect to time.
The operation status of the RCS was sufficiently
stable in JFY 2022. The availability of the RCS is summarized in Table 1. In JFY 2022, the operation time for
the MLF was ~3301 h, excluding the commissioning
time, and the downtime due to the RCS was ~52 h. The

Fig. 11. Changes in the RCS output particles over time.

J-PARC Annual Report 2022

Accelerators

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Table 1. Summary of availability
Facility

User time(h : m)

MLF

3301 : 28

Trouble in RCS Availability of(h)RCS (%)

52 : 08

98.4

availability of the MLF was evaluated using these values and found to be 98.4%. In JFY 2022, RCS delivered
beams only to the MLF due to the MR upgrade activity,
and thus there was no operation time for Neutrino andHadron users.
Hardware issues• Capacity of the cooling water system
The trial of the 1-MW continuous operation in
JFY2020 revealed a critical issue in achieving a stable
operation. When the outside temperature and humidity increased, the temperature of the cooling water also
increased and became uncontrollable. This phenomenon induced the temperature interlock of the vacuum
tube in the RF final-stage amplifier. Thus, the coolingwater system had to be improved to ensure a stable
1-MW operation in all seasons. In the summer shutdown period of 2021, performance recovery activity of
the cooling water system was under-taken. This activity revealed that the low performance was due to thecontamination of the heat exchange unit. Therefore,
the unit was disassembled and washed during the summer shutdown period. After the recovery activity, thecooling water temperature was reduced despite using
a higher beam power.
To confirm the effect of the recovery activity on
the cooling water system, a high-power beam trial was
conducted from June 24 to 26, 2022. Figure 12 shows
the temperature and output beam power trends during the trial. Continuous operation commenced with
910 kW from 11:14; however, it halted at 13:33 due tothe interlock of the vacuum tube temperature. At that
instant, the outside temperature was rapidly increasing
and reached more than 32 °C. This indicated that thecapacity of the cooling water system was insufficient tocool the vacuum tube of the RF system even after therecovery of its original performance. Thereafter, beam
power was reduced to 800 kW and resumed at 14:21;
however, the temperature of the vacuum tube frequently increased close to the threshold. Therefore, we
had to halt the trial each time and wait till the temperature decreased, but the outside temperature was kept at~30 °C; the cooling water temperature did not decreasesufficiently even by midnight. Subsequently, the trial
at 910 kW was aborted, and instead, the trial was performed at 800 kW until the next morning. However, thetemperature of the vacuum tube increased close to thethreshold again in the morning, and the beam power
was further reduced to 600 kW. Finally, at 12:38, a failure
occurred at RF #10 system. As immediate recovery was
not possible, we continued the trial at 600 kW till thenext morning.
Notably, the temperature in June 2022 was an
extraordinary case. Figure 13 shows the temperature inJune 2022 and the average values for June from 1990
to 2020. The graph reveals that the temperature at theend of June 2022 was at least 10 °C higher than average.
Previous results indicated that a 1-MW beam could beaccelerated if the temperature was maintained under
the usual conditions. Furthermore, the user operation
typically ends in the second half of June; therefore,
1-MW operation is possible when the weather is cooler
than that in June 2022.
• Failure of the transformer ‐ rectifier assembly
As mentioned above, the failure occurred at RF #10
system during the 1-MW trial in June of JFY2022. The RF

Trip of the vacuum tube

Fig. 12. Trends in beam power, cooling water temperature,and outside temperature.

Fig. 13. Trends of the outside temperature in Mito city.

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J-PARC Annual Report 2022

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system was tripped due to an over current of the transformer‐rectifier assembly, and could not be restored
immediately. Figure 14 shows the transformer‐rectifierassemblies of the RF system.
We replaced the failed assembly to a spare one at
the end of March 2022, but the spare assembly also had
problems and did not work. We have started to produce a new assembly and it will be installed at the endof JFY2023.

Fig. 14. The transformer - rectifier assemblies of the RF system.

Beam study results
We have continued the beam study to achieve further reduction of the beam loss. One of the remaining
sources of the beam loss is the intrinsic sextupole fieldcomponent in the injection chicane bumps (SBs). The
sextupole field drives the 3nx = 19 resonance. This resonance is not so strong and does not cause immediate
beam loss, but when the accelerating particle stays longer on this resonance, the horizontal emittance grows
up and the particle would be lost. We have three sets ofsextupole magnet systems, but these are used for chromaticity correction and suppression of the instability
and no additional sextupoles exist for correction of thisresonance. To reduce the effect of the intrinsic sextupole field by SBs, we studied the operation parameterswith reduced SB fields for partial mitigation. Figure 15

Fig. 15.	Study results with/without reduced SB fields. The
green line shows the loss signals at the original SB
field strength, and the purple line indicates the loss
signals with 80% SB field strength.

shows the study results with/without reduced SB fields.
The study results indicated that the beam loss at
the collimator was approximately 50% reduced, and thehorizontal beam emittance was also reduced to 90%of the original parameter case. We implemented thisparameter to the operation from the autumn of 2022.
We also optimized some other parameters (transverse and longitudinal painting pattern, betatron tunes
and so on), and we have achieved more than 80% beamloss mitigation at 1 MW beam operation as comparedwith the operation in 2020. Now the residual beam loss
is less than 0.05% even at the 1-MW beam power anddominated by the foil scattering. We will try to further
reduce the foil size.
In this year, MR was not operated due to its upgrade
work. However, we carried out the beam tuning for
MR. We tried the lower SB field strength parameter,
but there was no significant improvement in the MR
case. In fact, the transverse painting area in the MR
operation is smaller than that of the MLF case, and thissituation makes foil scattering a major cause of the loss.
Therefore, the lower SB field operation is not effective
for the MR case, but this guaranties that the lower SB
operation does not conflict with the beam operation to
the MR, while it has a significant benefit for the operation to the MLF. We also tried to extend the transverse
painting area from 50 to 100 mmm-mrad. with a newpainting pattern. The results showed that it is possible
to increase the paint area without affecting the beamemittance of MR. The number of the foil hits will be
reduced by 50% for the MR operation if this new painting pattern is adopted. We will continue to optimize
these MR operation parameters.
Summary
RCS is almost continuing a stable user operation
with an 800-kW beam. Even after the recovery of thecooling water performance, the present system cannot accelerate a 1-MW beam under high temperatureand humid condition like in the summer. However, theuser operation ends in the second half of June, in theusual season, thus the 1-MW operation is possible if theweather is not as hot as it was in the last year.
For the MLF operation, optimization of the transvers and longitudinal painting, betatron tune andresonance correction were performed. The residual
beam loss at 1 MW is even less than 0.05%, mitigatedby more than 80% from that of the 2020 operation. The
residual beam loss is mostly caused by the unavoidable
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foil will be tested. We will also try to correct other resonances near the present operating point.
We have maintained a smaller emittance beam for
the MR. A slightly larger painting area for the MR gives

a significant beam loss reduction as well as 50% foil hit
reduction, while keeping the rms emittances the same.
We will try to implement a larger painting area for the
beam operation to the MR.

MR
Overview
MR has been operated with the beam power of
515 kW by 2021 for the fast extraction (FX) mode to
the neutrino facility with the cycle time of 2.48 s. The
number of accelerated protons was 2.66 × 1014 which
was the world record for synchrotrons. The beam power
for the slow extraction (SX) mode was 64.5 kW for the
hadron experimental hall with the cycle time of 5.2 s.
The extraction efficiency was 99.5% which was also aworld record. To achieve higher beam power, we haveupgraded the magnet power supplies, RF system, collimators, injection and extraction system. The hardware
upgrade has been performed to introduce the faster
cycle operation by JFY2021. We intended to shorten
the cycle time to 1.36 s for the FX mode. In JFY2022,
we started the tuning of the hardware and beam forthe faster cycle operation. We have delivered an 8 GeV
SX beam to the COMET experiment through the new
Hadron C beam line.
Upgrade works for the faster operation
We have completed the construction of the power
supplies for the main magnets and the rearrangementof reused power supplies in JFY2021. The rearrangement included the configuration change of fivequadrupole magnet families. Each of these families was
divided into two families by half a circumference each.
Therefore, the number of the quadrupole families wereincreased from 11 to 16. We have started tuning of thepower supplies in JFY2022. It has been a challenging
project, because the tuning involves many new components, various types of power supplies and many
patterns for the accelerator operation modes.
Seven fundamental RF cavities and two second harmonic RF cavities were used for the FX operation of the
2.48 s cycle in JFY2021. We have installed two new cavities and power amplifiers by JFY2022 (Fig. 16). Since only
one of two new anode power supplies was ready forthe operation in JFY2022, there were eight available RF
cavities for fundamental and two for second harmonic.

The injection and extraction devices have been
prepared for the faster cycling. The extraction system
consists of two low field septum magnets and four highfield septum magnets. Eddy current type magnets wereconstructed for the low field septum magnets. Threeout of four high field magnets were constructed (Fig. 17)
and one of them was reused from the abort side extraction magnets which had relatively larger apertures. The
power supplies were also reused. To achieve the fasterFig. 16.	Two RF cavities and power amplifiers installed in theinsertion A.

Fig. 17.	High field septum magnets SM30, SM31, SM32 installed in insertion C.

Accelerators

J-PARC Annual Report 202212
cycling, the magnets were designed to have smaller
inductances. They were also designed to have larger
apertures and smaller leak magnetic fields to the circular orbit with magnetic field shields.
MR has a feature of beam loss localization with collimators. The number of collimators used to be four. We
installed two more in 2022 (Fig. 18). We have a plan toinstall another one in 2023. The total number will beseven and the beam loss capacity will be from 2.0 kW
to 3.5 kW. The beam loss localization will be improved.

Fig. 18.	Collimator C (left) and D (right, installed in 2022) ininsertion A.

Initial failures of the upgraded equipment andrecoveryDuring the test operation of the upgraded equipment, several failures occurred. We, then, took effective
measures to solve the problems.
For the main magnet power supply, the following
failures occurred in 2022: a contactor failure in the BM6
power supply, a number of blown fuses due to opticalfiber cable disconnection for the QFN and QDN power
supplies, a power supply shutdown due to noise in thehigh-speed interlock system, and an IGBT unit failure in
the BM4 power supply. We have taken effective measures to rectify all of the problems.
From the incident of the optical fiber cable disconnection for the timing signal, many fuses of the power
supplies were blown. Clock signals such as 12 MHz
are sent to the power supplies from the master timing
system by optical fiber cables. If the clock signal is interrupted, the switching state of the IGBTs is fixed at thatpoint, resulting in an overcurrent that causes the fuses
to blow. We made the modification for each power supply to have an internal clock signal generator, and if theexternal signal is interrupted, it is switched to use theclock signal from the internal clock signal generator,
and the power supply is then safely shut down.
For the newly fabricated FX septum magnets, there
was poor soldering in the area where the coils makeelectrical contact with each other to form turns, and thehollow conductors melted during the test operation,
causing water leakage. Therefore, the soldering was
reinforced, and the support was improved. In addition,
the coils themselves are being re-produced, and someof them have been completed, and there are plans to
manufacture and replace the remaining coils in the
future.
Beam test and operation
From June to July 2022, the beam tuning was performed at 3 GeV DC without acceleration. From January
to March 2023, the beam tuning was done with acceleration to 8 GeV. In addition, SX tuning and beam delivery
were performed at 8 GeV for the COMET experiment. The
beam power was 240 W with extraction every 9.6 s. The
extraction efficiency was 99% and the spill duty was 76%.
From April 2023, we plan for beam tuning with acceleration to 30 GeV and user operation of both FX and SX
mode.
Injection tuning, optical measurements and tuning
were performed for the new FX mode. Using the newly
installed LLRF system, voltage feedback was provided
for the harmonics of 6 - 12 to suppress longitudinal oscillations with high intensity eight bunch beam (Fig. 19).
The previous FX septum magnets had a leakage
field to the orbit, and vertical beta function modulationof up to 10% was observed. The new magnets have a
reduced leakage field and correspondingly the beta
function modulation was improved to be 1/10 (Fig. 20).
Optical correction turned out to be more difficult
with the increase in the number of quadrupole magnet
families from 11 to 16 and the division of five of thesefamilies by half a circumference each. In particular,

Fig. 19.	Longitudinal beam oscillation observed in themountain plot with a wall current monitor for 8
bunch injection.

J-PARC Annual Report 2022

Accelerators13
the betatron phase advances of the three arcs werealigned during the injection period. In addition, as in
the previous beam tunings by 2021, the currents in thecorrection coils of the four sextupole magnets were
adjusted to correct multiple third-order resonances.
With these beam tunings, we were able to accumulate
protons equivalent to a beam power of 740 kW, which
was close to the original target of the J-PARC MR, with agood beam loss localization, even though only for the
injection period (Fig. 21).

Fig. 20. 	Vertical beta modulation. Top figure shows the measurement in April 2021. Bottom figure shows themeasurement in July 2022.

Fig. 21. Beam survival measured with DCCT.

Materials and Life Science
Experimental Facility
Overview
In 2022, beam power of 830 kW with high operational efficiency of over 90% was reached for the firsttime in the user program. 21 neutron beamlines and7 muon areas were operated. Despite that, the soaring electricity costs affected the beam time, J-PARC
reviewed the operation schedule upon the approval ofa supplementary budget and decided to elongate the
MLF user operation until March 14. The user program
was operated for a total of 146 days, although 159 days
were originally planned, and 418 general user proposals were conducted.
Over 250 papers were published, such as a structural study of new flexible and tough super elastic Alloywith promising use in Biomedical Applications, asteroid
explorer Hayabusa2, initial analysis revealing the formation and evolution of the carbonaceous asteroid Ryugu,
nondestructive two-dimensional quantitative analysis
of degradation of the charging capacity of Lithium-ion

secondary batteries and discovering the hidden orderof the Mo and Nb atoms in disordered Ba7Nb4MoO20
crystals.
As part of the process to establish a stable operation, the target vessel replacement process was
re-examined, and the tritium release was successfully
reduced. Also, the preparation of the spare muon target(the 3rd muon rotating target) advanced, and will becompleted in 2023.
The SEOP system as a spin polarizer on BL23 hasbeen set and finally the on-beam commissioning witha polarized neutron beam has begun. Constructing theworld’s first muon accelerator on the H2 area of H-line
was approved by the Nuclear Regulatory Authority(“GENSHIRYOKU-KISEI-CHOU”). The RFQ and IH-DTL, bywhich ultra-slow muons are accelerated to 4.3 MeV, will
be installed in the H2 area. They act as the front stage ofthe 212-MeV linear accelerators.

Materials and Life Science Experimental Facility

J-PARC Annual Report 2022

16
Events in 2022 were held in a hybrid mode of in-person and internet meetings: one of them was the Annual
meeting of neutron industrial application at Akihabara
with 300 participants. This annual meeting was held tomerge the outcomes from the MLF and Japan Research
Reactor - 3 (JRR-3) of JAEA. The 11th International
Workshop on Sample Environment at Scattering
Facilities (ISSE) was held at Nasu and the 6th Neutronand Muon School (NM-school) was held as KEK-IINAS(Inter-Institution Network for Accelerator Science)
School at Tokai (https://mlfinfo.jp/sp/school/6th-nms/).
In November 2022, the border control of Japan
returned almost completely to the rules from the time
before COVID-19. The number of foreign users is gradually reaching the previous level and various activities
now take place as before.

Neutron Source Section
At the beginning of fiscal year 2022, the beam
power at the MLF was raised from 730 kW to 830 kW on
April 7, which was the highest level of beam power onrecord for the long-term user program. Since the proton
beam pulses at the 3GeV rapid cycle synchrotron (RCS)
outlet are shared between the MLF and the 30GeV main
ring (MR), the beam power at the MLF becomes lower
than that at the RCS outlet and is changed in accordance with the operation mode of MR. The share of
MR is 3.1% in slow extraction mode and 11.8% in fast
extraction mode. 830 kW at the MLF was attained when
the power at the RCS outlet was raised from 760 kW to860 kW with a slow extraction mode of MR, but due tothe mode change to fast extraction, the power at the
MLF was reduced to 770kW from June 4, even though
the power at the RCS outlet was raised to the highest
record of 870 kW. The stable operation continued, andthe beam operation of the MLF ended on June 26 after
a two-day operation for beam study and the maintenance works during the long outage started.
Here, some important remote-handling operationsin the hot cell are highlighted. One was the replacement of the used proton beam window and volume
reduction. The proton beam window is mounted on theshielding plug and integrated into one unit as shownin Fig. 1 left photo. When the operation of the proton
beam window reaches the material lifetime, whichis ca.10000 MWh, the unit is replaced with a new one
with a new proton beam window mounted on it, andthe used unit is temporally moved to the storage space.
Then, usually in later years, the used proton beam window is dismounted from the unit and replaced in the
hot cell by remote handling to reuse the shielding plug.
In 2022, the used proton beam window, which ended
its operation in 2020, was replaced and the utility pipes
were cut into pieces by the cutting machine shown in

Fig. 1. Unit of proton beam window and the cutting machine.

Fig.1 right photo for volume reduction by remote handling operation. The operations were successfully done,
and the new unit was ready to be used as a spare proton beam window.
Another notable operation was the remote handling test of the moderator & reflector assembly carriedout using a spare assembly. An assembly consists ofthree moderators, a reflector, and a shielding plug, andonly the used moderators and reflector are replaced
while the shielding plug is reused just like the proton beam window. Because the operating lifetime ofa moderator and reflector assembly is comparatively
long, 30000 MWh corresponding to 8 years at 1MW, thelast remote handling operation was done during thecommissioning period before the beam operation of
MLF started more than 10 years ago, so the inheritanceof skills and experiences is very important. The remotehandling procedures were checked carefully to handle
the actual radioactive assembly in the near future.
On September 26, specimens were cut out from the

J-PARC Annual Report 2022

Materials and Life Science Experimental Facility

17
forefront wall of the used target vessel, which was operated with 836 kW at maximum. This time, the specimen of
the inner wall of the mercury vessel, which was protectedagainst the pitting damage by micro-bubble injection
into mercury flow, could not be obtained, because thespecimen fell into the mercury vessel. But the damage on
the specimen of the outer wall of the mercury vessel, themercury boundary wall, was negligibly small, which wasa promising result for the stable beam operation withgreater beam power. On October 11, the used mercury
target vessel was replaced with a new one which had thesame structure as the former one.
On November 21, the beam operation of the user
program started with 780 kW, which was a little bit lessthan that before the long outage due to the trouble
with the accelerator component. The beam power at
the MLF was changed several times between 730 kW
and 810 kW due to the change of the beam operation

mode of MR for beam study. The beam operation of
the MLF had continued very well with the excellent
availability of more than 95% and ended on March 15
as scheduled.
There were three international collaboration
workshops. One was held from October 10 to 11 with
European Spallation Source (ESS) on-site at Lund in
Sweden with online capability. Main topics were commissioning works in every aspect of the project. The
others were held on-site at J-PARC. One was heldfrom February 27 to March 1 with ISIS of Rutherford
Appleton Laboratory. Information exchange in the fieldof the accelerator system and neutron/muon target system was the primal scope. Another workshop was heldfrom March 22 to 24 with the Spallation Neutron Source(SNS) of Oak Ridge National Laboratory to discuss theneutron source system issues. Many fruitful discussions
were held at all workshops.

Neutron Science Section
1. User program
COVID-19 as a global health emergency has been
toned down in 2022. After nearly 7 million deaths,
WHO Director-General Tedros has declared the crisis isover. The user operation in Materials and Life Science
Experimental Facility (MLF) was also back to normal
as Japan opened its borders with cautious measures.
Particularly, vaccinations could save people from severe
spreading of infections and lockdown. Still, we maintained strict conditions for immigration, the MLF kept
concentrating on stable operation and prudent infection control. As a result, MLF achieved 830 kW power
operation in the first half of the year and over 95% operating rate, both are the best performance ever in MLF.
303 and 291 in general proposals (involving oneyear proposal and new-user proposal) were submitted
for the operation period of 2022A and 2022B, respectively. The number of applied proposals has kept almost
stable in recent years, and 266 were approved for theyear of 2022. In addition, 4 of the long-term proposals
out of 5, have been approved.
2. Instruments up to date
We are continuously making efforts to upgrade
the instruments for realizing much more effective andfruitful experiments. One of key items that can ensure
our success are the so-called sample environment (SE)devices, that can control external physical parameters
on samples, like temperature, magnetic field, pressure,electric field, and so on. And such physical parameters
are essential to investigate new phenomena, properties
or even new fields of sciences. We report a couple ofexamples below.
Newly designed Paris-Edinburgh high-pressure
apparatus has been used for investigating properties ofquantum harmonic oscillator of metal hydrides underpressure. Hydrogen vibration excitations of fluoritetype ZrH1.8 and TiH1.84 were investigated at pressures
up to 21 GPa by incoherent inelastic neutron scatteringexperiments. From the pressure dependence of lattice
parameters determined by diffraction experiments, therelations between metal-hydrogen distance and thefirst excitation energy E1 of ZrH1.8 and TiH1.84 at highpressures are found [1].
Most of the neutron experiments are facing thebackground (BG) issues, in particular the BG from sample container/cavity. It sometimes causes distorted
interpretation of the obtained data. A group of BL02
developed a low-BG sample cell specific to aqueous
protein solution samples, conducted with a neutron
back-scattering spectrometer. It was found that the
scattering intensity of an aluminum sample cell coatedwith boehmite using D2O was lower than that of asample cell coated with regular water (H2O). Meticulous

Materials and Life Science Experimental Facility

J-PARC Annual Report 2022

18
attention to cells with small individual weight differences and the positional reproducibility of the sample
cell relative to the spectrometer neutron beam position enabled the accurate subtraction of the scatteringprofiles of the D2O buffer and the sample container.
Consequently, high-quality information on protein
dynamics could be extracted from diluted protein solutions [2].
3. Other activities
As the pandemic situation is improving, the firstin-person international workshop after COVID took
place, hosted by J-PARC MLF. The 11th International
Workshop on Sample Environment at Scattering
Facilities (ISSE-WS) was successfully held at Resort
Hotel Laforet Nasu, Tochigi, Japan, from August 28th toSeptember 1st. This workshop series takes place every 2
years under the patronage of the International Society
for Sample Environment (ISSE). Engineers, technicians
and scientists working on sample environment at theneutron/synchrotron facilities in the world and industrial partners participate in this workshop to present

various topics related to sample environment and to
discuss new techniques, collaboration among facilities
and so on. There were 87 participants, including five
online participants, gathered in Japan from 11 countries. Also, some of other activities are as follows: The
Commissioning Workshop of ESS & J-PARC collaboration (October 10, 2022); The 6th Neutron Muon School(December 12 to16, 2022); Quantum Beam Science
Festa 2022 in Tsukuba (March 13 to 15, 2023).
4. Award
The JSNS (Japanese Society for Neutron Science)
Encouragement Award has been given to Dr. Wu Gongfor “Studies on Microstructure Evolution and Mechanical
Properties in Structural Metallic Materials by in-situ
Neutron Diffraction”. Also, the JSNS Poster Award, given
to Dr. Wenqi Mao for “Effect of Grain Refinement on
Deformation-induced Martensitic Transformation”.
Reference[1] T. Hattori, et al., Phys. Rev. B 106 134309 (2022).
[2] T. Tominaga, et al., Life 12(5) 675 (2022).

Neutron Instrumentation Section
The neutron instrumentation section has beendeveloping position-sensitive neutron detectors(PSND) for upgrading of the neutron scatterings instruments in the MLF.
3
As for the He gas-based neutron detectors, theirperformances have been simulated by using GEANT4
by the KEK detector team. Geant4 is a toolkit for simulating the physics interaction of particles passing
through matter and can be used to evaluate detector
performance [1]. Figure 2 shows the amount of energy
33
loss that occurred in the He(n,p) H reaction within a

Fig. 2. Amount of energy loss within a 3He-gas based PSND
3
3
in the He(n,p) H reaction with a 25-meV incident neutron.

3

He-gas based PSND when a 25 meV neutron is vertically incident on the detector. One characteristic shapeis that the events lower than 0.05 MeV are contributions
3
3
from electrons not mediated by the He(n,p) H reaction.
These electrons are produced by the g-rays emitted by
the absorption reaction between the incident neutrons
and the SUS that is the detector housing. Events due
to wall effects are widely distributed from 0.19 MeV to
the total absorption peak at 0.76 MeV. The edges at 0.57
MeV and 0.19 MeV correspond to the initial energies ofproton and triton, respectively. For events contained in
the 0.05 MeV to 0.19 MeV region, the reaction point of3
3
the He(n,p) H reaction is extremely close to the detector housing, so proton and triton lose little energy inthe sensitive area. This information is difficult to obtainfrom actual measurements and is one of the benefits ofsimulations that provide support in the evaluation of
detector performance.
As for scintillation detectors, a new large area
detector has been successfully developed for the SENJU
instrument. SENJU is a time-of-flight Laue single crystal
neutron diffractometer. To scan a wide reciprocal space
as efficiently as possible, SENJU has been equipped with

J-PARC Annual Report 2022

Materials and Life Science Experimental Facility

19
41 original detector modules. Although these detectors
contribute to the increase of a solid angle coverage,
physical gaps between detectors cause missing diffraction peaks inherently. Hence, a large area detector
has been requested for a long time. With the preceding
feasibility study and careful long-term stability test [2],the large area detector was developed and produced in

2022 for SENJU (Fig. 3). Like in the case of the original
detectors, a scintillator and wavelength-shifting fiber
detector technology has been employed. The detector
has a neutron-sensitive area of 512 x 512 mm, which isfour-fold compared to the original one with a detector
pixel size of 4 x 4 mm, which is like that of the originalSENJU detector. In order to fit in the limited installation
space, the detector depth has been designed as thinas possible to ~190 mm, which is 63% of the originalone. The detector exhibited detection efficiency of 50%
60
for 2-Å neutrons, Co gamma-ray sensitivities of ~1 x
-6
10 , neutron count uniformity of 5~9% (1s). All of theseparameters exceeded those of the original ones, andthey are acceptable for use in the beam line. The detector has been installed under the new vacuum vessel in
SENJU and has been in service since 2022.
References[1] S. Agostinelli, et al., Nucl. Instr.& Meth. A 506 250 (2013)., H.
Ohshita, et al, to be published.

Fig. 3. Photograph of the new large area position-sensitive
scintillation neutron detector for the SENJU instrument.

[2] T. Nakamura, et al., 2019 IEEE NSS/MIC Conference Records,
N19-236.
DOI: 10.1109/NSS/MIC42101.2019.9059981

Muon Section
1. Development of the D2 instrument
In recent years, elemental analysis with muonic
X-rays is becoming popular in the D line. A lot of elemental analyses were conducted on archaeologicalobjects, meteorites, and lithium-ion batteries. To obtain
the data in a shorter time, the sample environment andthe detectors were refurbished. The major change wasin the sample chamber, the newly installed hemispherical chamber has 11 ports to mount the detectors (Fig. 4).
2. Progress of the laser system for ultra-slow muon
generation
The ultra-slow muons are generated by ionizing
the evaporated muonium from the muon-stopping
target by irradiating coherent lights. To realize efficient ionization of muonium, vacuum ultraviolet (VUV)
light (122.09 nm Lyman-α) and coherent light withwavelengths shorter than 360 nm are required. So far,over 10 µJ Lyman-α light has been successfully generated and applied to ultra-slow muon generation. To
generate high-power VUV light, the power of the fundamental pulses of 1062.78 nm is required to be 100 mJ,

Fig. 4. Picture of the Hemispheric chamber in the view fromdownstream of the beam. Gold coins are set at a sample
position. The Ge detectors and multi-pixel detectors areequipped at Port 1 - 7, and Port 8 - 9, respectively. Ports 10-11 can be used for decay counters and other detectors.

Materials and Life Science Experimental Facility

J-PARC Annual Report 2022

20
and specially produced Nd:YGAG and Nd:YSAG ceramics
rods (ø4 mm, 80 mm long) are used in diode-pumped
amplifiers as a gain medium. However, when using
such a long rod, it was difficult to eliminate the optical
wavefront distortion caused by the inhomogeneity inthe medium. Thus, we decided to change the pumping configuration from a conventional side pump to an
end pump geometry to reduce the optical path length
in the gain medium (Fig. 5). The pump light from laser
diodes (LDs), which used to be injected from the sideof the rod, will be injected coaxially. The new pumping
geometry requires spatial profile shaping for the pumplight beam from LDs, but the wavefront distortion can bedramatically reduced by shortening the crystal length. In
the new method, sapphire substrates are bonded to thelight input and output surfaces of Nd:YSAG for efficientcooling and end-face protection. The amplifier module
is composed of 9.3 mm cubic Nd:YSAG ceramic, sapphire
plates (ø25.4, t=2 mm) bonded on the ceramic, and awater-cooling holder (Fig. 6).

(a)3. The kicker system of the S line
The kicker is essential for the simultaneous singlepulse operation of the S1 and S2 areas. However, as
shown in Fig. 7, the number of failures has increased inlast few years. This could be due to MOS-FET degradation in the kicker power supply. Therefore, just before
the start of the 2022B period, we replaced some MARX
boards preventively by measuring the MOS-FET leakage current. However, many boards judged healthy inthe preventive diagnosis failed in the 2022B period. As

Pumplifrom la ght
ser diodeFig. 7. Number of MARX board failures that occurred in each
operating period. Gray (yellow) bars represent the
number of failures in the circuit that kicks the beam
toward S1 (S2), respectively.

gain medium

long dis~100 tance
mm

(b)

Pump
li
from la ght
ser diodeshortd~10 m istancem
Fig. 5. Schematic of pumping geometry. (a) conventional
side pump for long laser rod and (b) end pump for
short laser disk
(a)

(b)

(c)

Fig. 6. Nd:YSAG ceramic for power amplifier. (a) polished ceramic cube, (b) bonded ceramic cube with sapphire
plates and (c) set in a water-cooling holder

Fig. 8. Picture of the H-line after the H2 area construction.

J-PARC Annual Report 2022

Materials and Life Science Experimental Facility

21
a next countermeasure, we plan to replace the MOSFET devices with modern SiC devices; we have alreadyselected SiC devices and verified the operation of thepower supplies alone. The replacement work will bedone after clearing the technical issue of mixing the useof the SiC device with the existing MOS-FET.
4. The H2 area construction
The first branch of the H-line named the H1 area
was completed in January 2022, and then the commissioning was performed. The intensity of the surface
muons was measured and was almost the same as its
8
design value (10 muons/s), despite the absence of a
DC separator (or Wien filter) and the failure of the power
supplies of the capture solenoids. Currently, the H1 area
is open for users. In the second branch of the H line, theH2 area, applying the technique developed in the Uline, ultra-slow muons are produced and re-accelerated
up to 4 MeV and will be the frontstage of the world’s
first muon accelerator. The beamline is planned to beextended further to produce a novel low-emittancemuon beam by accelerating up to 212 MeV. The beam
will be used in the measurement of the muon g-2 andelectric dipole moment and the transmission muon
microscope (TμM). A new building on the east sideof the MLF is necessary to extend the beamline. The
engineering design of the extension building will befinalized in the next fiscal year. The H2 area construction
was completed in March 2023 and the self-radiation
inspection was done in April (Fig. 8). The commissioning will be performed in the subsequent periods.

Technology Development Section
The technology development section has beendeveloping a pulsed magnet system higher than 30
Tesla. After the high-intensity pulsed neutron beam
became available at the MLF, we received requests fromusers to introduce pulsed-type high magnetic fieldequipment at the MLF. In order to make the equipment
usable at several beamlines, we made it compact andmovable [1]. Figure 9 shows the cross-section of thedeveloped pulsed magnet equipment. It comprises a
vacuum chamber, a closed-cycle refrigerator for sample cooling down to 4 K, and a nitrogen bath made ofa rectangular cross-section stainless-steel (SUS) tube.

The coil is inserted in the nitrogen bath. It is immersed
in liquid nitrogen to reduce the resistance and quickly
remove the Joule heat generated by the pulsed currentof the coil. Figure 10 depicts a photograph of the coil. A
high-tensile strength Cu–Ag alloy with 1 mmø (CA100PIWC-7, SWCC Showa Cable System Co., Ltd.) for thewire is used. The sum of the turns is approximately 200.
The coil inductance and resistance at 100 Hz are 670 μH
and 100 mΩ at 77 K, respectively. The sample is attached
to a 7 mmø single-crystalline sapphire rod that is connected to the GM refrigerator and cooled down to 4 K
through heat conduction. The sample is placed in thecenter of the coil. The scattering angle, 2θ, is 42°.
The pulsed magnet system was commissioned on
NOBORU (BL10) as a demonstration [2]. A single-crystalline multiferroic TbMnO3 [3] was used as a test sample.
The change in the TOF spectrum of the Mn momentswith and without a magnetic field was experimentally

21 mm

44 mm

Fig. 9. Cross-section of the pulsed magnet equipment.

Fig. 10. Photograph of the coil.

Materials and Life Science Experimental Facility

J-PARC Annual Report 2022

22
validated. As shown in Fig. 11, the TOF spectra of the redand blue points are 0 and 30 Tesla, respectively. Thereare Bragg peak signals in Fig. 11 that correspond to the
propagation wave vector (0, 0.28, 1) of the Mn moments
at 0 T and (0, 0.25, 1) of it at 30 T. The TOF of the Bragg
peaks are estimated to be approximately 10.25 ms and10.4 ms using the Gaussian function, respectively. This
result means that the magnetic field dependence of thediffraction peaks with and without a magnetic field wasclearly observed using the pulsed magnet system.
Fig. 11. TOF spectrum applied to the sample.

References[1] M. Watanabe, H. Nojiri, J. Neutron Res. 21 39 (2019).
[2] M. Watanabe, T. Kihara, H. Nojiri, Quantum Beam Sci. 7 1 (2022).
[3] S. Quezel, F. Tcheou, J. Rossat-Mignod, G. Quezel, E. Roudaut,
Physica B+C 86-88 916 (1977).

Particle and Nuclear Physics

Neutrino Experimental Facility
In FY2022, the Neutrino Experimental Facility continued to carry out maintenance and upgrade work started
in FY2021. Although the upgraded neutrino beam wasoriginally supposed to restart operation in the fall of2022, the start date was delayed to early FY2023 due tothe MR accelerator commissioning.
Various neutrino beamline upgrades towards
accepting 750kW beam power were completed. Two of
the three electro-magnetic focusing horns on the beamline were successfully replaced with new ones. The newhorn 2 has an improved cooling scheme, and all horns
are now compatible with an operation at a proton beam
power of >1.3 MW. A new horn power supply, which was
installed in FY2021, also allows the horns to run at a current of 320 kA, which improves the horn focusing powerby ~5~10%. An upgraded target cooling system was also
installed, which allows the neutrino production target
to withstand 750kW proton beam power. A new target
designed to withstand >1.3MW is also under development at Rutherford Appleton Laboratory in the UK.
Major upgrade work was also carried out for the nearand far detectors of the T2K experiment during FY2022.
For the near detector upgrade, a new tracking detector,
SuperFGD, was assembled at J-PARC by a dedicated teamof experts and shift people, as shown in Fig. 1.
3
The detector consists of ~2 million 1x1x1 cm scintillator cubes read out in three dimensions by wavelength
shifting fibers coupled to ~56k photosensors. Two new
High-Angle TPCs, as well as six new Time-of-Flight panels, were also assembled and tested at CERN and will beParticle and Nuclear Physics

J-PARC Annual Report 2022

24
shipped to J-PARC in FY2023. These new detectors will
all be installed inside of the T2K ND280 near detector in
FY2023.
The Super-Kamiokande detector was successfully
doped with additional Gd, increasing the Gd concentration from 0.01% to 0.03%. This improved the neutron
capture efficiency of the detector from 50% to 75%, without negative impact to the other detector measurement
capabilities or parameters.
The Hyper-Kamiokande project is proceeding, as
tunnel excavation for the far detector is progressing welland slightly ahead of schedule.
The quality of about 3,700 newly developed
50-inch photomultiplier tubes (PMTs), which are key
components of the Hyper-Kamiokande detector, were
inspected for mass production by the beginning of
FY2022. PMT delivery will be re-started in early FY2023,

Fig. 1. SuperFGD during assembly.

and a total of 50-inch 20,000 PMTs will be installed in thetank by FY2026. Investigation of the Intermediate Water
Cherenkov Detector candidate site, civil construction
methods, and cost estimation is ongoing.

Hadron Experimental Facility (HEF)
Hadron Experimental Facility (HEF) was developed
for the fixed-target experiments for particle and nuclear
physics using secondary particle beams produced byslowly extracted (SX) high-intensity proton beamthrough the A-line from Main Ring (MR) synchrotron as
well as the 30-GeV primary proton beam at the B-line.
In FY2022, a new beam line (C-line) for COMET started
its operation.
Technical paper on the currently using indirect
water-cooled production target at the A-line which canaccommodate 95 kW beam was published [1].
COMET Experiment
COMET aims to identify muon-to-electron con-14
version with a sensitivity higher than 10 . Intensive
research and development were conducted in FY2022.
The C-line is the third primary beam line branched
off from the B-line in the Hadron Experimental Hall. The
8 GeV proton beam is delivered through the C-line to a
production target made of a thin graphite in the primarybeam line area of the Hadron South Building (Fig.2 Left).
Muons, decay products of pions produced backward
are delivered to the experimental area (MU experimental area) through the transport system which currently
comprises of a superconducting solenoid magnet called
muon transport solenoid (MTS) and vacuum ducts.
The first beam of the 8-GeV protons was delivered to
the C-line on February 8 (Fig. 2 Right). The commissioning

Fig. 2. (Left) C-line in the primary beam area in HadronSouth Building. The 8-GeV proton beam is injected tothe production target from the top. (Right) Researchers in the counting room at the first beam shot.

of the C-line and COMET engineering run were carriedout on in February and March 2023 for 301 hours in total.
After the facility inspection by a third-party organization
on March 14, the change of the license as a radiation
facility was officially approved on March 15.
Strangeness / Hadron Physics Experiments
Installation of detectors of a new particle spectrometer, S-2S, is in progress at K1.8. Reaction spectroscopy
12of the double-strangeness Ξ hypernucleus, Ξ Be, (E70)and X-ray spectroscopy of Ξ -C atom (E96) are planned
to be conducted using S-2S after S-2S commissioning
in FY2023. Maintenance and reinforcement of detector

J-PARC Annual Report 2022

Particle and Nuclear Physics

25
modules are also in progress at the high-p beam line
(B-line) for the E16 experiment which aims to study inmedium mass modification of vector mesons and thegeneration mechanism of hadron mass.
Several results from the experiments were published in FY2022. The K N pole position of Λ(1405)
was newly determined by the E31 group conducted at
K1.8BR in 2016 and 2017 [2] (see the highlight article
for details). Commissioning of electron identification
detectors for E16 was reported [3].
E40 conducted at K1.8 from 2018 to 2020 reported+
differential cross section for Σ p elastic scattering and the3
1
first trial to evaluate phase shifts of the S1 and P1 channels
3[4]. In the S1 channel, a large repulsive core is predictedowing to the Pauli effect between quarks. The evaluatedinteraction in this channel is moderately repulsive.
The result of Ξ atomic X-ray spectroscopy wasreported by E07 which aims to study the double
strangeness system by stopping Ξ particles in the
nuclear emulsion at K1.8 in 2015 to 2017 [5]. In this analysis, X-rays from Ξ -Ag and Ξ -Br atoms were measured
in coincidence with the Ξ stop identification by theemulsion scanning. No clear peak was observed mainly
due to statistics. However, they reduced successfully
backgrounds by a factor of 1/170 by employing the Ξstop identification.
KOTO 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.
In FY2022, the analysis of the data taken in 2021
was intensively processed. In parallel, a search for pairproduction of dark particles in a KL decay, KL→XX with
X→ γγ, was performed by using data taken in 2018, andthe result was published [6]. For preparation of the next
run, development of the new data acquisition that canaccommodate a higher beam power and fabricationof a new charged particle detector with a better background rejection were carried out.
Future Plans of HEF
After the discussion at KEK Science Advisory
Committee (SAC), the future plans of HEF, namely, theHEF Extension Project, was regarded as the first priority project to request new budget in the KEK Project
Implementation Plan 2022.
The 3rd HEF-ex workshop on the HEF extension
project was conducted at Tokai from March 14 to 16,
using a hybrid style. The event featured 89 talks addressing both experimental and theoretical aspects of thelatest physics research. Among the 188 participants,
59 were international, with 60 attending in-person,
including 10 from abroad. This marked the first major
in-person international workshop post-COVID-19,
emphasizing the active and ongoing research in the
HEF extension project across both experimental andtheoretical domains.
References[1] M. Saito et al., Phys. Rev. Accel. Beams 25, 063001 (2022).
[2] S. Akikawa et al., Phys. Lett. B 837, 137637 (2023).
[3] S. Nakasuga et al., Nucl. Instr. Meth. A 1041, 167335 (2022).
[4] T. Nanamura et al., Prog. Theor. Exp. Phys. 2022 093D01 (2022).
[5] M. Fujita et al., Prog. Theor. Exp. Phys. 2022 123D01 (2022).
[6] C. Lin et al., Phys. Rev. Lett. 130, 111801 (2023).

Particle and Nuclear Physics Experiments at MLF
The JSNS2 experiment to search for sterile neutrinos had its second long-term data taking period,
from January to June 2022, running with 800kW beam
power. Also, the second phase of the experiment,
JSNS2-II, received stage-2 approval from KEK/J-PARC. A
new detector at 48 m from the target, outside of the
MLF experimental hall, is under construction as shownin Fig. 3.

The IPNS muon and neutron group focuses on precision measurements using muons and neutrons. In
2022, they launched the KEK-PSI workshop on muonand neutron technology, with the inaugural workshop
held virtually in April. The group is preparing to measure the anomalous magnet moment (g-2) and electric
dipole moment (EDM) of muons at J-PARC MLF. They
have successfully directed the surface muon beam toParticle and Nuclear Physics

J-PARC Annual Report 2022

26
the H1 area, with its commissioning confirmed throughbeam characteristics. Infrastructure changes, like radiation shielding and assembly of the H2 experimental
area, are in progress for the muon g-2/EDM experiments.
Additionally, preparatory works outside the MLF building, including relocation of cables and water piping, havebeen completed. The building's area plan is being finetuned under the J-PARC working group.
The vacuum chamber, equipped with electrodes forthe initial acceleration and transport of muons, and the
IH-DTL acceleration cavity for the low-energy part of the
RF accelerator were fabricated. The collaboration set up
an experiment to demonstrate muon cooling by meansof the resonant laser ionization of muonium atoms at the
MLF S2 area. This experiment took data successfully until
mid-March 2022. Developments of muon LINAC, injection system, storage magnet, magnetic field monitors,
and positron detector has been carried out. The grouppublished two technical papers about their work [1, 2]

2

Fig. 3. PPMT installation in the new JSNS detector.

References[1] “Modeling the diffusion of muonium in silica aerogel and its
application to a novel design of multi-layer target for thermalmuon generation”, C. Zhang et al., NIM A 1042 167443 (2022).
[2] “High-power test of an interdigital H-mode drift tube linac”, Y.
Nakazawa et al., PRAB 25, 110101 (2022).

Theory GroupThe mission of the theory group at the J-PARC
branch is to investigate the theoretical aspects of particle and nuclear physics, in collaboration with theexperimental groups at IPNS and J-PARC. At the sametime, it serves as a hub for gathering theorists andexperimentalists in these fields. Several workshops on
hadron physics were organized in FY2022.

Technical Support Group (Esys-Tokai)
The electronic systems group constructs electronicsystems for IPNS/J-PARC and collaborates with otherinstitutes through a framework, “Open-It.” A variety of
wide-bandgap semiconductors are intensively studied
for applying to the COMET experiment at J-PARC.
The data streaming type high-resolution TDC(Str-HRTDC) was developed and implemented to thegeneral-purpose FPGA module, AMANEQ. It was realized by several techniques, that is, the tapped-delay-line
based FPGA HR-TDC, the heartbeat method defining the
global time frame, and the clock distribution system,

MIKUMARI. The TDC can provide unique time stamp with30 ps precision over 2.4 hours and continuously send thedata to a PC with 10 Gbps using SiTCP-XG.
We developed the next generation DAQ software
for the trigger-less data acquisition called NestDAQ. Itsfeature is the semi-automatic process connection topology. The complex multi-end topology can be generated
with a small description in the configuration file. The loadbalancing is natively supported. We tested them at the
RCNP Grand Raiden.

J-PARC Annual Report 2022

Particle and Nuclear Physics

27— Research Highlight —Mass and Width of the Λ(1405) Hyperon ResonanceHadrons are composite particles constituted ofquarks. They are classified into baryons and mesons.
In the naïve quark model that preceded the standard
model, a baryon is a bound state of three valence quarks
while a meson is a bound state of a pair of a quark andan antiquark. Protons and neutrons (generally called
nucleons) are the lightest baryons, from which various atomic nuclei are synthesized, which in turn form
elements.
The ordinary visible matter that makes us up andsurrounds us is made of the elements. Research on
hadrons is challenging, especially the question of how
hadrons are formed from quarks, which is the basis of
the formation and evolution of matter in the universe(Fig. 4).
Λ(1405) is one of well-known baryons as the firstexcited state of a Lambda (Λ) hyperon. It is an unstable(a very short-lived) resonance state that upon creation
immediately decays into a π meson and a Sigma (Σ)
hyperon. On the other hand, it has been argued formany years that Λ(1405) is not an excited state of thesimple orbital motion of quarks in a baryon, but abound state of an anti-K (K ) meson and a nucleon (N). In
the latter case, Λ(1405) is regarded as a so-called exotic
state, which contains an anti-quark in a baryonic systemthat does not fit the conventional hadron classification
mentioned above. In this regard, Λ(1405) has attracted
the attention of researchers around the world for many
years.

Fig. 4. Schematic illustration of matter evolution in the universe. “How are hadrons constituted of quarks?” is an
important question sitting on the basis of the formation and evolution of matter in the universe. A better
understanding of Λ(1405) can improve our understanding of how ordinary visible matter has evolved
since the Big Bang.

If we can directly synthesize Λ(1405) by fusing K
and N, we should be able to obtain useful informationon the K N interaction and the properties of Λ(1405).
However, since Λ(1405) is lighter than the sum of K and
N masses, it cannot be synthesized by the direct fusionof K and N in free space. This was a barrier to study theproperties of Λ(1405).
Using an intense, negatively-charged K-meson (K )beam provided at the K1.8BR beam line in the J-PARC
Hadron Experimental Facility, we have carried out anexperiment and succeeded in measuring the seriesof reaction processes to form Λ(1405) [1], in which a
deuteron, that is the bound system of a proton anda neutron, is impacted by K to knock out a neutron,
and a recoil K meson is slowed down and reacts with aresidual N, as shown in Fig. 5. The recoil K is a so-called
off-shell kaon, whose mass differs from and can belower than that in free space. Thus, we could produceΛ(1405) via a fusion reaction of the off-shell K and theresidual N which is also off-shell.

Fig. 5. Schematic illustration of the reaction to form Λ(1405).
An incident K knocks out a neutron from a deuteronat a forward angle and a recoil off-shell K (green circle) reacts with a residual off-shell N (thick blue circle)
forming Λ(1405).

We measured the πΣ production cross section in
the K d → nπΣ reaction as a function of the invariant
mass of the final π and Σ state, as shown in Fig. 6 (a).
The spectrum contains the scattering amplitude of the
K N → πΣ reaction. As a result of analyzing this reaction process according to the scattering theory in the
K N and πΣ coupled system, we were able to deduce
K N → K N scattering amplitude and determine themass and width of Λ(1405), as shown in Fig. 6 (b). We
+6.0
+1.1
2
found the mass of 1417.7 –7.4 (fit) –1.0 (syst.) MeV/c and
+6.0
+1.7
2
the half width of -26.1 –7.9 (fit) –2.0 (syst.) MeV/c . This2
2
mass estimate is 13 MeV/c heavier than 1405 MeV/c
which has been referred as the mass of Λ(1405) so far.

Particle and Nuclear Physics

J-PARC Annual Report 2022

28
Furthermore, we have shown that Λ(1405) has a larger
component of K N than that of πΣ . The latest theories
suggest that there are two resonances coupled to K N
and πΣ at around the Λ(1405) mass region. The Λ(1405)
observed so far might be superposition of the two
resonances. The present result is consistent with theresonance coupled to K N.
The results of the present research directly provide
basic information on the interactions between K and
N as well as for understanding the properties of therecently discovered novel K mesonic nucleus [2, 3]. The
strength of the attraction between K and N /nucleus
affects the description of ultra-high-density nuclear
matter, such as whether K mesons are condensed in thecore of a neutron star.
Reference[1] S. Aikawa et al., Phys. Lett. B 837, 137637 (2023).
[2] S. Ajimura et al., Phys. Lett. B 789, 620 (2019).
[3] T. Yamaga et al., Phys. Rev. C 102, 044002 (2020).

Fig. 6. (a) Measured πΣ production cross section in the
K d → NπΣ reaction as a function of the invariant massof πΣ. Squares and triangles were obtained from different charge states of π and Σ. The vertical line indicatesthe location of the sum of K and N masses. The measured spectrum was reproduced by scattering theory(solid lines, see description in the figure).
(b) Deduced K N → K N scattering amplitude. Whenthe real part (solid line) crosses 0, the imaginary part(dashed line) reaches its maximum value. These are
typical line shapes in the case that a resonance state
exists. The arrow indicates the location of the mass of
the resonance state.

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 2022

30

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 FY2022.
Liquid nitrogen was also supplied to the users fortheir convenience. Its amount in FY2022 is summarized
in Fig. 2. The MR has been shut down until the end of2022, but the heavy user of cryogen is MLF user, therefore the amount of cryogen usage did not change thatmuch compared with the last year.

Fig. 1. Liquid helium supply at J-PARC from April 2022 toMarch 2023.

Fig. 2. Liquid nitrogen supply at J-PARC from April 2022 toMarch 2023.

Superconducting Magnet System for T2K
Table 1. Operation history of the T2K superconducting magnet system.

2022

April

May

June JulyAug.

Operation

Sept. Oct.

Nov.

Dec.

2023

Jan.

12/12-12/28

Feb.

Mar

April
4/3-4/27

Maintenance

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 16 days in
December and regular maintenance works were carriedout in the autumn. Figure 3 summarizes the incidents in
the refrigeration system from FY2009, which shows thatthe magnet system has been quite stable.
Table 1. Operation history of the T2K superconducting magnet system.
Fig. 3. Summary of incidents in the Refrigerator system for
T2K.

J-PARC Annual Report 2022

Cryogenics Section

31

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 11 to July 4 2022.
Annual maintenance, such as exchange of the second
oil separation filter, safety valve maintenance and so on,
was performed from July to the end of October.

Fig. 4. Exchange work of the second oil separation filter.

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 superconducting
magnets and cryogenic system. The COMET magnet
system consists of a pion capture solenoid (PCS), amuon transport solenoid (MTS), a bridge solenoid (BS),and a detector solenoid (DS). The MTS and BS magnets
have already been delivered to J-PARC. The PCS andDS magnets are under construction at their respective
factories. In the winter of 2022, the J-PARC accelerator
provided a beam for the COMET experiment with a simple secondary beamline configuration using only MTS
called Phase-a.
The MTS completed the connection of the current
lead box and cold box via the transfer tube in FY2021,
and commissioning have been performed to confirm
the soundness of the system and magnetic field measurement. During the first commissioning, the circuit
was shut down due to the movement of the coils andthe instability of the power supply, finally, the staff
succeeded in realizing current transport up to 130
A for solenoid and 175 A for dipole without quench.
The magnetic field maps of the solenoid and dipole
were measured using three-axis Hall probes on a cart.
Figure 5 shows a photograph of the cart with the Hall
probe mounted and Figure 6 shows a comparison
between the measurement result and the simulation by
OPERA of the solenoid field at the center of the muon
beam axis in case of the transport current of 105 A.

Measured data at the center of the muon beam axis arein good agreement with a field calculated by OPERA.

Fig. 5. A photograph of the cart with the Hall probe mounted.

Fig. 6. A comparison between the measurement and thesimulation of the solenoid field in case of the transport
current of 105 A.

Cryogenics Section

J-PARC Annual Report 2022

32
The MTS was operated for the COMET Phase-α
experiment. The large eddy current and force had
current rating of 105 A limited to half for solenoid
corresponding to a magnetic field of 1.5 T due tounconfirmed additional support soundness. During the
beamtime, MTS kept the excitation for a total of 319
hours without shutdown.
The commissioning of MTS aimed at generating a
3 T solenoid field was performed after the beam timefor Phase-α. We succeeded in the combined current
transport for Phase-I experiments of 210 A for solenoid(3 T), ±175 A for dipole (±70 mT), and -21 A for suspension using TS3 coil.
The PCS and MTS magnets are conductively cooled
to around 4 K by two-phase flow helium supplied froma helium refrigerator having two turbines. We conducted a cooling and excitation test of the transport
magnet system until the first half of the fiscal year. The
transport solenoid reached a steady cryogenic state 21days after the start of precooling. Figure 7 shows theprecooling curves of the transport magnet system. TS-3
and TS-2a are the magnets farthest from the helium
cooling pipe, and TS-3 has a larger cold mass than theother magnets, therefore TS-3 takes a longer time toreach a steady state. After the magnet reached a steadystate, various interlock tests were conducted to confirm

the soundness of the control system. After that, excitation and shutdown tests were carried out. An automatic
control system for various operations, such as precooling, warm-up, quench recovery and re-cooling wasestablished through a series of the cooling and excitation tests. After local construction for Phase-α andcompletion inspection based on high pressure gas
regulation, cooling operation for the Phase-α started
in mid-December 2022. The cooling system, including
the transport solenoid, operated without any trouble
for about three months until the end of the experimentin mid-March.

Fig. 7. Precooling trend of the transport solenoids

R&D for the Future Projects at J-PARC
The g-2/EDM project aims for the precise measurement of the anomalous magnetic moment and theelectric dipole moment of muons. This experiment was
proposed at the MUSE H-Line. A superconducting solenoid with a high field homogeneity, better than 1 ppm
locally, plays a very important role as a muon storage
ring. The kicker coil is installed inside the magnet bore
to store the muon beam around the magnet center.

Fig. 8. Prototype of magnetic field distribution measurement
system for g-2/EDM experiment.

The study of kicker coil showed to require cu busbars
for supplying current, meaning that vertically straightholes in the bottom iron yoke plate are necessary. The
yoke design is now being optimized in terms of magnetic field homogeneity even in the vertical asymmetryof yoke structure.
The prototype of magnetic field distribution measurement system has been developed. Figure 8 shows
the prototype of the system.
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 TS2-PCS magnet
will be required to operate in extremely high radiation
environments where the absorbed dose reaches 130
MGy. In such an environment, conventional organic
insulating methods, such as epoxy resin, will not be

J-PARC Annual Report 2022

Cryogenics Section

33
applicable. Therefore, we have been developing themineral insulated HTS coils to which ceramic coating and ceramic bonding technology are applied. As
a result of research and development so far, we succeeded in molding a ceramic insulating layer of about
20 mm thickness on both sides of a tape-shaped conductor with a thickness of 0.1 mm and a width of 4 mmover a length of 40 m using a continuous spray anddrying method. The about 20 mm thick-insulating layercomposed of a one-to-one ratio of aluminum oxide andsilicon dioxide has been confirmed to have a withstandvoltage of 2 kV. In FY2022, three seamless double pancake type racetrack coils with a straight section lengthof 300 mm and a width of 20 mm were wound basedon a coated 4 mm wide tape conductor by a so-called
wet winding method using a ceramic adhesive. Figure 9shows a picture of wound mineral insulated racetrack
coil based on REBCO coated conductor. These coils will
be assembled with external supports for reinforcement
and copper stabilizers with ceramic adhesive, and will
be fitted with voltage taps and Hall sensors. As partof U.S.-Japan Science and Technology Cooperation
Program in High Energy Physics, they will then be sent
to Brookhaven National Laboratory in the United States
for performance evaluation tests in a liquid helium
immersion-cooled test stand with a back-up field ofapproximately 10 T.

Fig. 9. A picture of wound mineral insulated racetrack coil based on REBCO coated conductor.

Information System

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

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

Status of Networking
Since 2002, the J-PARC network infrastructure,
called JLAN, has been operated independently fromKEK LAN and JAEA LAN in terms of logical structure andoperational policy. In 2022, the total number of hosts
on JLAN exceeded 5,800, which has increased by 36
hosts in this year. The growth curve of edge switches,wireless LAN access points and hosts (servers and PCs)connected to JLAN are shown in Fig. 1.
In April 2022, the National Institute of Informatics(NII) upgraded SINET (Japan Science Information
Network https://www.sinet.ad.jp) from version 5 to 6.
SINET is not only a gateway from JLAN to the internet

Information System

J-PARC Annual Report 2022

36
but also an important connection between the Tokaiand the KEK Tsukuba sites in J-PARC.
Figures 2 and 3 show the network utilization of theinternet from/to JLAN. Since the bandwidth capacity
for the internet through the SINET is 10 Gbps (Giga-bits
per second), 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 Tsukuba sites.
The network bandwidth capacity between the two sites
is 20 Gbps. This shows that the usage level has been
approaching half of its capacity, especially during theperiod when the Hadron and g-2 facilities were running.
7000

Edge Switches

and WLAN AP

300

SW

350

100

6000

WLAN Access Points

5000

No. of hosts

250

4000

200

3000

150

2000

50

1000

0

0

No. of Hosts connected to JLAN

400

Number of Hosts , edge SW and wireless AP on JLAN

Gbps

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

1.5
1
0.5
0
Apr-22

May-22

Jul-22Aug-22outbound(2h avg.)

Oct-22

Dec-22

Jan-23Mar-23outbound(5min peak)

Gbps

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

1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
Apr-22

Jul-22
inbound(2h avg.)

Oct-22
Jan-23
inbound(5min peak)Fig. 3. Network traffic from the internet to JLAN.

J-PARC Annual Report 2022

Information System

37

Gbps

Tokai <-- Tsukuba
10
50
Apr-22

May-22

Jul-22Aug-22Oct-22

inbound(2h avg.)

Dec-22

Jan-23Mar-23

inbound(5min peak)Fig. 4. Network traffic from the Tsukuba to Tokai sites.

Gbps

Tokai --> Tsukuba
10
8
6
4
2
0
Apr-22

May-22

Jul-22Aug-22Oct-22outbound(2h avg.)

Dec-22

Jan-23Mar-23outbound(5min peak)Fig. 5. Network traffic from the Tokai to Tsukuba sites.

10

Gbit/s8
6

Network Traffic: 5min. peak maximum in a year
L2VPN Tokai
to Tsukuba
L2VPN
東海→つくばinternet inboundinternet outbound4
202009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022

FY

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

Information System

J-PARC Annual Report 2022

38

Internet Connection Services for Visitors and Public Usersof J-PARC
Since 2009, J-PARC had 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 had 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 newservice called “eduroam” had been started. The eduroam (https://www.eduroam.org/) is a secure roaming
access service developed for the international researchand education community and mutually used among
a huge number of research institutes, universities,
and other institutions around the world. The eduroam
service will be a convenient third option of internet
connection service for J-PARC visitors. Figure 7 shows
this fiscal year’s usage statistics of GWLAN, User LAN
and eduroam services.

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

Status of Computing
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

Since J-PARC does not have computing resources
for physics analysis, starting from 2009, the KEK centralcomputing system (KEKCC) at the KEK Tsukuba campus
has been mainly used for that purpose. KEKCC is sharedby most of the research groups 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 and then promptly transferred, stored,
and analyzed at the system in Tsukuba. The storage ofthe system is also utilized as a permanent data archivefor their data. The third upgrade of the system was completed in 2020, and the computing resources are shownin Table 1. Figures 8-10 show the utilization statisticsof the computing resources in FY2022. The main users
who used the CPU and storage constantly were fromthe Hadron and Neutrino experiment groups. The MLF
group also started to store data to tapes on the system.

J-PARC Annual Report 2022

Information System

39

CPU Utilization

100
80
%

60
40
20
0

HadronNeutrino

MLF

Other KEK users

Fig. 8. CPU usage statistics of KEKCC in FY2022.

Fig. 9. Disk usage statistics (left: trend of FY2022; right: annual trend)

Fig. 10. Tape library usage statistics (left: trend for FY2020, 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 harm caused by high-level radioactive
waste produced in nuclear power reactors. We believethat the ADS is one of the most beneficial applicationsof high-power accelerators for contributing to humansociety such as the carbon neutrality and SDGs.
We have developed the J-PARC Transmutation
Experimental Facility (TEF). One of the two individual
facilities of TEF is the ADS Target Test Facility (TEF-T) for
irradiation of beam window materials in a flowing hightemperature lead bismuth eutectic (LBE) alloy target. The
baseline design of TEF-T is available in the design report
JAEA-Technology 2017-003. The future direction of TEF

was discussed in the Partitioning and Transmutation
Technology Evaluation Task Force (TF) established by
the Ministry of Education, Culture, Sports, Science andTechnology (MEXT) in 2021. In accordance with the TF’s
conclusion, the future policy of TEF planning was statedin the JAEA’s mid- to long-term plan (MLTP) as follows;“Regarding the J-PARC TEF program, JAEA reframes thefacility plan based on the results of related R&D andversatile needs to the facility in addition to nuclear transmutation research.” Now we are building up the facility
concept to comply with the MLTP.
On July 28, 2022, a workshop on “J-PARC Proton
Beam Irradiation Facility Plan and Establishment of Its
User Community” was held. There were 133 participants,
with 14 in-person and 119 online. After addressing theimportance of nuclear transmutation and the current
status of the facility planning, needs of the potential

Transmutation Studies

J-PARC Annual Report 2022

42
users of the facility were presented from four areas,i.e., material damage, semiconductor soft error testing, radioisotope production for medical applications,and proton beam applications. Then, a user communityof the facility was launched. A questionnaire survey ofparticipants’ areas of interest revealed that they havehigh expectations for the proton beams available in thefacility in many areas in addition to the nuclear transmutation research. As a part of the initial activities of theuser community, users’ expectations from the facility inthe four areas have been summarized in a documentof six pages, and the user community submitted it to
J-PARC in April 2023. The latest facility concept withincorporating the users’ needs is shown in Fig. 1.
As for the R&D activities on the lead-bismuth target
technology, the third campaign of materials corrosion
Irradiation samples (fusion & fission)
PBW

Pb-Bi

LBE target

400 MeV, 250 kW

Proton beam

Four important areas ofapplication have been identified.

Irradiation
samples baseline design:(Accelerators) TEF-T

Sample specimens （SUS･T91）

Water or He cooling

Large components
handling room

1. Materials irradiation• high-energy accelerator
facilities including ADS• fusion and fission reactors

Linac side

L-TEF BT tunnel
Laser charge
exchange

250kW

In-cell craneTarget station

Power manipulator
TP+0m
TP+8.9m

Target trolley

Hot-labo.

J-PARC’s existing facilities

HD

Multi-purpose use room

LBE target

PIE specimens

NU

to TEF-P

H- beam from Linac
400 MeV, 250 kW,
625 μA, 500 μs, 25 Hz

A part of the proton
beam is branched withflexibly changing its
intensity and pulse width.

TP+15.3m
10W
Irradiated components handling room

2. Soft error testing ofsemi-conductor devises

MLF

Irradiated components
storage room

3. RI production
4. Proton beam
applications• PIE of irradiated samples• Chemical processing for RI production

PIE specimens

Fig. 1. The latest facility concepts.

test for 7,000 hours under oxygen concentration controlled high-temperature lead-bismuth flowing using the
OLLOCHI loop was completed successfully in October
2022. Sample steel specimens are under examination.
As for the R&D activities on the proton beam technology, a series of measurements of neutron production
yields from iron, lead and bismuth targets bombarded
by a 107-MeV proton beam provided by the fixed-field
alternating gradient accelerator at Kyoto University wascompleted. A research paper describing the measured
data in comparison with theoretical simulation calculation results published in Journal of Nuclear Science andTechnology [1] has been awarded the paper prize by the
Atomic Energy Society of Japan in March 2023 (Fig. 2).
In addition, the basic design of a super-conducting linac for ADS with introducing the fault tolerantcapability has been completed. Assembling of a superconducting spoke cavity for ADS’s linac by electron
beam welding has progressed.
In February 3, 2023, the ninth TEF TechnicalAdvisory Committee (T-TAC) was held online. J-PARC
staff reported the progress in the facility planning andtheir R&D activities on the ADS development. The main
conclusion for the facility planning was as follows:“T-TAC encourages to further capture on a regular basethe needs of potential user’s communities also at an international level as well as to involve these communities in
the progress of the realization of the whole facility while
continuously analyzing the complementarity of the facility regarding other existing or projected infrastructures.”
Reference[1] H. Iwamoto, et al., Measurement of 107-MeV proton-induced
double-differential thick target neutron yields for Fe, Pb, andBi using a fixed-field alternating gradient accelerator at Kyoto
University,

Fig. 2. From left, Drs. Yosuke Iwamoto, Hiroki Iwamoto,Shin-ichiro Meigo and Daiki Satoh.

J. Nucl. Sci. Technol. 60 (4) (2023) 435–449. doi:10.1080/00223
131.2022.2115423.

Research and development
Lead-bismuth target technology development
Management of the Lead-bismuth eutectic (LBE)
is one of 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.

1. OLLOCHIThe third campaign of long-term corrosion test in
OLLOCHI (Oxygen-controlled LBE LOop Corrosion tests
in HIgh-temperature) [1] for 7,000 hours, which corresponds to the yearly operating hours of the ADS, started
in October 2021 and completed in October 2022. Test
conditions of the third campaign were as follows: theJ-PARC Annual Report 2022

Transmutation Studies

43
maximum temperature and the temperature difference
were 450˚C and 100˚C, respectively. The flow rate wasabout 1 m/s at the specimens’ position. The oxygen-6
concentration (OC) was kept at 1 × 10 wt%. The tested
specimens were taken out from the specimen holders
and are being observed.
After the third campaign of the corrosion test, westarted the fourth one in March 2023. The total operation period was about 2,000 hours. Prior to testing,pre-oxidation operation was conducted at 500˚C for
168 hours in LBE at near saturated OC. The OC was then-6adjusted to 1 × 10 wt%. The maximum temperatureand temperature difference were 500˚C and 100˚C,respectively. The flow rate was about 1 m/s at the specimen position.
Observation and analysis for specimens of the firstcampaign have progressed. Test conditions of the firstcampaign were as follows: the maximum temperatureand the temperature difference were 450˚C and 100˚C,respectively. The flow rate was about 1 m/s at the-6
specimens’ position. The OC was kept at 1 × 10 wt%
and the test duration was 2,000 hours. As an example,
SEM images for cross sectional observation after the(a) T91
LBE

resin
oxide
LBE

Oxide layer peeling(b) T91-1.5Si

T91

corrosion tests for (a) T91(Mod.9Cr-1Mo steel) and (b)Si-added T91 are shown in Fig. 3. For the T91 specimen,
the oxide layer is peeled off and Pb and Bi are revealed
under the oxide layer. For Si-added T91, no oxide peeling and no Pb and Bi under oxide layer are observed.
These results indicate that Si addition could suppress
the Pb/Bi penetration and oxide peeling.
2. IMMORTALIMMORTAL [2] is a mockup loop of the LBE spallation target in TEF-T. In the loop, LBE, pressurizedwater, and air were employed as coolants for primary,secondary, and ternary systems, respectively. LBE, a
low Plandtl number fluid, shows different heat transfer
behavior in comparison with common fluids, such as
water. However, experimental data to evaluate its heattransfer are scarce due to the difficulty of experimental
measurement. Therefore, we have measured the turbulent heat transfer of lead-bismuth in a circular flow
channel with pressurized water as the secondary coolant using a heat exchanger of IMMORTAL.
Figure 4 represents the relationship between the
Nusselt number and Peclet number, which are commonlyused to evaluate heat transfer. Two recommended correlations for LBE given in the literature [3] are presented in
the figure. Originally, these correlations have been proposed for the sodium heat transfer. In our experiments,
the provided heat input into LBE was set to 21 kW. The
obtained experimental data showed a correlation
close to the equation proposed by Seban-Shimazaki. In
FY2023, we plan to extend the experimental data andpropose a heat transfer correlation dedicated to LBE flow
in a circular channel. subsequently, we are also planningto perform experiments on transient phenomena, suchas a loss of flow accident.

resin

oxide

No oxide peelingT91-1.5Si

Fig. 3. SEM images for cross sectional observation of (a) T91 and(b) Si-added T91 after the corrosion test.

Fig. 4. Relationship between the Nusselt number and Peclet
numberTransmutation Studies

J-PARC Annual Report 2022

44
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[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

Figure 5 presents the JAEA-ADS triode extraction
system that has been optimized to control the proton
beam divergence. The proton beam has a current of
25 mA, an energy level of 35 keV, and normalized rms
transverse emittances of 0.08 π mm mrad. These beamvalues fulfill the specifications required for the JAEAADS linac.

[3] Handbook on Lead-bismuth Eutectic Alloy and Lead

Super-conducting linac development for ADS
1. Extraction system for the ion source
The ion source is necessary for particle accelerators since it provides the particles that are accelerated
downstream. In general, the ion sources consist of
two components, namely, a plasma generator and an
extraction system. The plasma generator provides therequired ions, and the extraction system shapes thebeam with the required size and orientation for the
next section. As a first step to complete the ion source
design, we concentrated on the extraction system.
To ensure optimal functioning of ADS linacs, highavailability is mandatory. Thus, a triode configurationconsisting of plasma (35 kV), suppressor (-2 kV), andground (0 kV) electrodes was chosen for the extraction
system. This scheme strikes a balance between beam
efficiency and simplicity. Additionally, the model keeps
the electric field strength between the electrodes
below 6 kV/mm to reduce the risk of arc discharge.
The optimization of the extraction system wasdone through a series of steps using AXCEL-INP 2-D program. Initially, the design geometry was parametrized,
followed by sequential scans. Finally, the beam performance was evaluated to guarantee optimal results.
During the process the input values were rectified toachieve the desired beam performance.

2. Fabrication progress of the prototype spoke cavity for the JAEA-ADS linac
In preparation for the actual design of the continuous wave (CW) proton linac for the JAEA-ADS, we are
now prototyping a low-beta single-spoke cavity. This
prototyping will provide us with various insights on
the development of superconducting (SC) cavities withtransverse electromagnetic (TEM) mode resonance.
We have started welding together the shaped cavity parts in 2021. The prototype spoke cavity is madeof pure niobium (Nb) except for the niobium-titanium
alloy (Nb-Ti) flanges for the radio frequency (RF) ports
and the beam ports. Before welding the actual cavity parts, the electron beam welding (EBW) beam
parameters for each welding condition were carefully
investigated using mock-up test pieces (Nb and Nb-Ti).
Furthermore, all welding grooves were acid cleaned(chemically polished) to remove impurities prior toeach EBW. Consequently, each cavity part was joined
together with smooth welding beads. The beam port
sections were successfully fabricated in fiscal year 2022
in addition to the body section fabricated in fiscal year
2021. So far, no obvious welding defects, such as unpenetrated welds and welding holes, have been found.
We have temporarily assembled the prototype
spoke cavity and measured its resonant frequency. The
cavity was assembled from the body section, two beam
ports, and two lids. Since the difference between themeasured and simulated frequencies was well within

Fig. 5. Beam trajectory for the optimized triode extraction
system for the JAEA-ADS linac.

Fig. 6. Setup for the frequency measurement.

Properties, Materials Compatibility, Thermal-hydraulics andTechnologies – 2015 Edition, (2015), 950p. NEA. No. 7268,

J-PARC Annual Report 2022

Transmutation Studies

45
the adjustment range in the final assembly process, it
was confirmed that there were no significant problems
with the cavity fabrication.
Study for nuclear technology
From fiscal year 2019 to 2022, we conducted anexperimental program on nuclear data for the researchand development of ADS, entrusted by MEXT. A seriesof experiments within this program were conductedusing the fixed-field alternating gradient (FFAG) accelerator at Kyoto University. The program comprised
two subprograms: neutron energy spectrum measurement and high-energy fission measurement. For bothsubprograms, we utilized 107-MeV proton beams generated with the FFAG accelerator.
In the first subprogram, we measured energy spectra of neutrons from proton-induced reactions usinga scintillation spectrometer system with the time-offlight technique. This allowed us to obtain nuclear data
for Fe, Pb, and Bi, which are crucial materials for ADS.
Furthermore, we successfully measured the fission rate237
of Np induced by spallation neutrons.
In the second subprogram, we measured the mass
distribution of fission fragments and fission neutrons

208
209
from Pb and Bi produced in proton-induced
reactions, utilizing a combination of multi-wire proportional counters (MWPCs) and a neutron detector system(Fig. 7).
As of March 2023, we have successfully completed all measurements in this experimental program,obtaining valuable nuclear data that will significantly
contribute to the ADS design. These data are expected
to enhance the prediction accuracy of neutronic design,
benefiting not only ADS research but also the design ofaccelerator facilities that utilize proton beams.

Fig. 7. Experimental setup of high-energy fission measurement

International and Domestic Cooperation
We are collaborating 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. We frequently discussed with the MYRRHA
accelerator team for the super-conducting Linac development. An on-line workshop, mainly for neutronics,
was held in January 2023.
We continued the collaboration with Karlsruhe
Institute of Technology in Germany on the LBE technology. We exchanged information about the LBE loop
operation.
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. Sample specimens were taken out of

the target vessel for PIE.
We are also collaborating with domestic universities and institutes. One of the collaborations is with the
University of Fukui on behavior of spallation and corrosion products in LBE. We are developing the Transportof RAdionuclides In Liquid metal systems (TRAIL) code.
We continued the experimental study on the evaporation behavior of volatile elements from LBE.
Another collaboration is with the Tokyo Instituteof Technology (TIT). Several steel specimens were provided by TIT, and these specimens were served for thematerials corrosion test with using the OLLOCHI loop.
In December 2022, we visited the National Institutefor Fusion Science (NIFS) in Gifu prefecture. They areoperating a high-temperature Pb-Li loop “Oroshhi”. We
have common interests in the high-temperature liquid
metal technology. We discussed the operation of both
NIFS’s and J-PARC’s liquid metal loops, i.e., Pb-Li, LBE
and Hg, and recovery of tritium from liquid metal, andso on.

SafetySafety

J-PARC Annual Report 2022

48

Safety1. Major events on safety culture and safety activities in the 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 FY2022, we established a safety policy of “Follow
safety rules and make potential risks shared”. Workers
were expected to improve their “sensitivity to risk” and“on-site capabilities” by engaging in the following activities: 1) knowing the rules, complying with them, andunderstanding their significance and principles; 2) carefully identifying latent risks and problems and sharing
them; 3) if having any questions or concerns, speaking out and thinking about it together. Table 1 lists the
major events on safety culture and safety activities in
the J-PARC.
In order not to forget the radioactive material leakincident that occurred on May 23, 2013, the J-PARC
exchanges safety information between each section
and has a workshop for fostering safety culture aroundMay 23 every year. The Safety Day in FY2022 was heldon May 23 via an online meeting. Some good practices
were awarded by the director. Following that, the maintalk entitled “Improving on-site capabilities throughmanuals - The concept of safe ergonomics” was given
by Prof. Akinori Komatsubara, Waseda University. In
the afternoon session, safety initiatives at each facility
were introduced. Further, an updated video materialon the radioactive material leak incident in 2013 waspresented.
An emergency drill was conducted on October 25
at the Materials and Life Science Facility. It was assumed
that the neutron beam shutter was opened when aworker was left in the neutron beam line BL22 and was
exposed to radiation. The drill included transportationand decontamination of the exposed worker, estimation of exposure doses, setup of the command post
and communication with the accident site, report tothe headquarters via TV conference, and a press release.

The fiscal 2022 J-PARC safety audit was conductedby two auditors on November 28. They reviewed thefollowing points: 1) organizational structure for safety
management, 2) safety management in works, 3)
emergency response, 4) safety education and fostering safety culture. The auditors reported that a safety
management system for keeping steady operation
with minimum trouble is being created. And they
recommended that 1) in order to establish theseachievements as J-PARC’s culture, we should repeatedly
discuss what J-PARC should do for the future, reviewing
what was pointed out at past audits in the viewpointsof a long-term period, 2) making sure to pass on thedesign concepts of J-PARC to the next generation, anddevelop human resources through active participationin expansion and new construction projects.
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 prior approval by
the local government in accordance with the Ibaraki
Prefecture Nuclear Safety Agreement.
The facility inspection for the new primary beamline (C-line) of the Hadron Experimental Facility, permitted above, was conducted by Radiation Management
Research Institute, Inc., registered inspection agency,
on March 14, 2023.
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 in the J-PARC.
In FY2022, the J-PARC Radiation Safety Committee
met twice, and the Radiation Safety Review Committee
met three times. Table 3 lists the major issues for thecommittees.

J-PARC Annual Report 2022

Safety49
4. Radiation exposure of radiation workers
The number of persons subject to annual measurement of external exposure in FY2022 was 3111.
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 26.8 person·mSv, andthe maximum effective dose was 1.6 mSv.

Table 1. List of major events on safety in FY2022.

Day

EventsMay 23, 2022

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

July 1, 2022

Liaison committee on safety and health for contractors

October-December

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

October 25, 2022

Emergency drill assuming, while a worker was in the neutron beam line BL22 of the Materials and Life Science Facility, the beam shutter was opened, causing massive exposure

November 28, 2022

FY2022 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 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 202250
Table 3. Radiation Safety Committee (RSC) and Radiation Safety Review Committee (RSRC) in FY2022

No.

Date

Major Issues

The Radiation Safety Committee
39th
40

th

July 19, 2022

• Report on the progress status of change permission application, personal
exposure situation, amount of radioactive waste released in FY2021

March 16, 2023

• Report on the response to legal revisions (ensuring measurement reliability)

The Radiation Safety Review Committee
34th

August 25, 2022

• Revision of the transportation rule for radioactive materials in J-PARC sitethJanuary 11, 2023

• Revision of the operation manual for J-PARC (MLF, HD)

thMarch 30, 2023

• Revision of the guidelines for accident countermeasure activities• Revision of the operation manual for J-PARC (MLF)

35
36

Table 4. Annual exposure doses in FY2022# 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

691

672

19

0

0

5.7

0.7

Users

1117

1116

1

0

0

0.1

0.1

Contractors

1306

1249

54

3

0

21.0

1.6

Total

3111

3034

74

3

0

26.8

1.6

*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 2022

52

Users Office (UO)
Outlinetration as a J-PARC User, radiation worker registration,
safety education, accommodation, invitation letter forvisa 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, andsafety education. 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 establishedin 2007. It opened an office on the first floor of the
IBARAKI Quantum Beam Research Center in Tokai-mura,in December 2008. UO maintains the Tokai Dormitory
for the J-PARC users. UO provides on-site and WEB support with one-stop service for the utilization of the
J-PARC. As of March 31, 2023, 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 theUsers Office (UO) WEB Portal Site, related to the regis-

1 Hitachi
Minami-ohta

Tokai Campus
Niken-jaya
intersection

TOKAI
Smart IC

J-PARC Users Office

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

Cocos
restaurant
62

PC depostore

Kakeagariintersection

Post Office

Tokai Hospital

JR Tokai
StationMobile phone
shop

Muramatsu
ShrineFire Station

Joban
Expressway

Magome-jujiro
intersection
349

Kasamatsu
Park

Ibaraki Higashi
National Hospital
245

Macdonald
Humbugger Shop
Lawson31

JR JobanLine

Naka-city Hall

3
2

Naka

Hitachinaka

Higashi MITO Expressway

Map to J-PARC Users OfficeJ-PARC Annual Report 2022

User Service

53

Activities of UO

J-PARC Users

Technical
contact
personTechnical
supportResearch
Proposal

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

Proposal
Advisory
Committee

Support Service
for Daily Life

Support for
J-PARC Utilization• Accomodation• Rent-a-car• Living information• User room
• Radiation/Facility
safety education

One stop service for J-PARC users

on the web
Step 1

on-site support

User registration

New user

Registered user

Getting user ID

Annual registration, specifyingof the visit

Approval of UO

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

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

Step 2-2

Optional application

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

Safety education and dosimeter

Users Office at IQBRC

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

Rental goods
BicylePHS
Cafeteria card
Locker key
Office key

Rental bicycle

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

Return box at IQBRC

User Service

J-PARC Annual Report 2022

54

User Statistics
Users in 2022 (Japanese ⁄ Foreigners, person-days)
4,000
4000

Foreigners

3,500
3500

Japanese

3,000
3000
2,500
2500
2,000
2000
1,500
1500
1,000
1000
500
500
00

4
2022

5

6

7

8

9

10

11

12

1
2023

2

3

Users in 2022
(according to organizations, person-days)

Users in 2022
(according to facilities, person-days)

Other 0Accelerator
516

Neutrino
4,484

Foreign
Organizations
6,155
MLF
12,962

Hadron5,154

PrivateEnterprises
1,014Japanese
Universities
14,853PublicOrganizations
1,094

HadronMLF

Neutrino

Japanese Universities
Foreign Organizations

Accelerator（人日）

Public Organizations
Other

Private Enterprises

（人日）

3

2

.1

12

23
20

11

9

10

8

7

3

2

.1

12

11

9

8

7

6

5

10

23
20

20

22

.4

00

6

500
500

5

1,000
1000

22

1,500
1500

20

2,000
2000

.4

2,000
2000
1,800
1800
1,600
1600
1,400
1400
1,200
1200
1,000
1000
800
800
600
600
400
400
200
200
00

2,500
2500

J-PARC Annual Report 2022

User Service

55

MLF Proposals Summary - FY2022
Table 1. Number of Proposals by Beamline
Beamline

2022A

2022B

Full Year

Submitted Approved Submitted Approved

Instrument

GU

GU

GU

GU

Submitted

Approved

PU/S

PU/S

IU

IU

BL01

4D-Space Access Neutron Spectrometer - 4SEASONS

22(0)

8(0)

25(0)

9(0)

0

1

0

1

BL02

Biomolecular Dynamics Spectrometer - DNA

18(2)

12(2)

21(1)

7(1)

2

1

2

2

2

1

4

1

0

0

0

(100-β)

‡

0

BL03

IBARAKI Biological Crystal Diffractometer - iBIX

0

0

1

1

24

0

24

BL04

Accurate Neutron-Nucleus Reaction Measurement Instrument - ANNRI

8

4

4

3

2

1

2

1

BL05

Neutron Optics and Physics - NOP

8

6

7

5

1

0

1

0

BL06

Village of Neutron Resonance Spin Echo Spectrometers - VIN ROSE

3

2

4

2

1

0

1

0

BL08

Super High Resolution Powder Diffractometer - SuperHRPD

11

8

6

5

1

0

1

0

BL09

Special Environment Neutron Powder Diffractometer - SPICA

5

5

1

1

1

0

1

0

BL10

Neutron Beam-line for Observation and Research Use - NOBORU

17

3

9

10

2

1

2

1

BL11

High-Pressure Neutron Diffractometer - PLANET

8(0)

7(0)

13(0)

5(0)

0

2

0

2

†

(β)

※

※

0

BL12

High Resolution Chopper Spectrometer - HRC

10

6

7

5

1

0

1

0

BL14

Cold-Neutron Disk-Chopper Spectrometer - AMATERAS

35

8

35

8

1

1

1

1

BL15

Small and Wide Angle Neutron Scattering Instrument - TAIKAN

34(2)

13(2)

36(0)

10(0)

2

4

2

4

BL16

Soft Interface Analyzer - SOFIA

21

12

21

10

1

1

1

1

BL17

Polarized Neutron Reflectometer - SHARAKU

17(2)

14(2)

15(1)

7(1)

3

2

3

2

BL18

Extreme Environment Single Crystal Neutron Diffractometer - SENJU

18(0)

8(0)

17(0)

7(0)

1

1

1

1

BL19

Engineering Materials Diffractometer - TAKUMI

27

12

29

7

2

1

2

1

3

3

5

5

0

0

0

0
0

(100-β)‡BL20

IBARAKI Materials Design Diffractometer iMATERIA

18

18

13

13

23

0

23

BL21

High Intensity Total Diffractometer - NOVA

21

19

14

10

1

0

1

0

BL22

Energy Resolved Neutron Imaging System - RADEN

23(0)

8(0)

18(1)

8(1)

0

2

0

2

BL23

Polarization Analysis Neutron Spectrometer - POLANO

5

4

6

4

1

0

1

0

D1

Muon Spectrometer for Materials and Life Science Experiments - D1

12(0)

6(0)

16(0)

9(0)

0

1

0

1

D2

Muon Spectrometer for Basic Science Experiments - D2

10(4)

5(3)

5(0)

1(0)

1

1

1

1

S1

General purpose µSR spectrometer - ARTEMIS

28(0)

15(0)

37(1)

12(1)

1

1

1

1

S2

Muonium Laser Physics Apparatus - S2

0(0)

0(0)

0(0)

0(0)

0

1

0

1

U1A

Ultra Slow Muon Microscope - U1A

0

0

0

0

0

1

0

1

U1B

Transmission Muon Microscope - U1B

0

0

0

0

0

0

0

0

H1

High-intensity Muon Beam for General Use - H1

0

0

0

0

0

1

0

1

382

207

371

158

65

24

65

24

Total

†

(β)

GU : General Use
PU : Project Use or Ibaraki Pref. Project Use
S : S-type Proposals
IU : Instrument Group Use† : Ibaraki Pref. Exclusive Use Beamtime (β = 80% in FY2022)‡ : J-PARC Center General Use Beamtime (100-β = 20% in FY2022)( ) : 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 2022

56
Table 2. Number of Long-Term Proposals by Fiscal Year
Application FY

Submitted

Approved

2020

13

3

2021

0

0

2022

5

4

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

199

329

Not Approved

360
389

Approved

395
245

126

42

200

278

293

460

422

469

2012

2013

2014

321
2015

353

2016

507

607

630

626

458
311

2017

2018

2019

2020

2021

2022

Fiscal Year

Fig. 1. Number of MLF Proposals over Time

CROSS
34
4%

JAEA
73
9%

KEK
49
6%
Universities (Japan)
Companies (Japan)
Universities (Japan)
321
38%

Research Institutes (Japan)
Foreign Organizations
JAEA

Foreign Organizations
250
29%

KEK
CROSS
Companies (Japan)
81
9%Research Institutes (Japan)
39
5%

Fig. 2. Origin of Submitted Proposals by Affiliation - FY2022

P9
9
1%

Q1
48
7%

Q2
59
8%

P1
54
8%

P1: Structural Science (Crystal, Amorphous and Liquid)
P2: Energy Science and High-Pressure Science

P2
71
10%

P3: Soft Matter and Biologocal Matter
P4: Magnetic Material and Strongly Correlated Electron System (Structure)

P8
84
12%

P7
29
4%

P3
109
16%

P5: Magnetic Material and Strongly Correlated Electron System (Dynamics)
P6: Fundamental Physics, Nuclear Physics, Instrumentation, Imaging
P7: Industrial Application
P8: Materials Engineering

P6
64
9%

P5
109
16%

P4
62
9%

P9: New User Promotion
Q1: Electronic Properties of Matter & Hydrogen in Matter
Q2: General Applications

Fig. 3. Submitted Proposals by Sub-committee/Expert Panel – FY2022

J-PARC Annual Report 2022

User Service

57

J-PARC PAC Approval Summary for the 2022 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 inStage 2 for Run 0
nuclei
Deferred for Run 1. PAC
High p(previously “Electron pair spectrometer at the J-PARC 50- recommended 101h+100h beam
GeV PS to explore the chiral symmetry in QCD”)
time for beam study & trigger study.

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

An Experimental Search for μ − e Conversion at a
Phase-I Stage 2−16
Sensitivity of 10 with a Slow-Extracted Bunched Beam

COMET

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

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

MLF

3

+

12
L

C

–

Registered as E62 with an updated
proposal

K1.8BR

Stage 2

K1.8

Stage 2

K1.8

Data taking–

Finished

Finished

A

–

K1.8

+

FisnishedA

E34

T. MibeUser Service

J-PARC Annual Report 2022

58
(Co-)
Spokespersons

Affiliation

Approval status(PAC recommendation)

Title of the experiment+++Beamline

Status+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

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

E65

A.K.Ichikawa,
Kyoto U
F.Sanchez

Proposal for T2K Extended Run

Stage 2neutrino

T66

T. Fukuda

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

Test Experimentneutrino

Nagoya U*–

Deferredneutrino
monitor Finishedbld

J-PARC Annual Report 2022

User Service

59
(Co-)
Spokespersons

Affiliation

Title of the experiment

Approval status(PAC recommendation)

Beamline

StatusP67

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 2neutrino 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

Stage 2

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

Stage 2

K1.8

P76

H.M.Shimizu

Nagoya U

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

MLF

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 1High p

E80

F.Sakuma

RIKEN

Systematic investgatin of the light kaonic nuclei

Stage 1
Deffered for Stage-2. TDR updatebased on FIFC comments isnecessary.

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

Stage 2MLF

E83

J. H. Yoo

Korea U

Search for sub-millicharged particles at J-PARC

Conditional to the satisfactory
update of the TDR, PAC suggests
Stage 2neutrino

Tohoku U

DeferredThis proposal is a part of the hadronHigh precision spectroscopy of Lambda hypernuclei withextension discussion and PAC++
the (π , K ) reaction at the High Intensity High Resolution
HIHR
awaits the outcome of the special
beamline
committee to convene in August for
more information.

3

P84

S. Nakamura

Test Experimentneutrino

4

DeferredThis proposal is a part of the hadron
extension discussion and PAC
K10,
awaits the outcome of the special
T2 target
committee to convene in August for
more information.

P85

K. Shirotori

Osaka U (RCNP) Spectroscopy of Omega Baryons

E86

K. Miwa

Tohoku U

P87

T. Gunji,
K. Ozawa,
H. Sako

Tokyo,
KEK, JAEA

Proposal for dielectron measurements in heavy-ion
collisions at J-PARC with E16 upgrades

Deferred
PAC encourages the proponents tothink about more versatile detector HI,
enabling (for example) concurrent high-p
measurement of leptonic andhadronic measurements.

E88

H. Sako

JAEA

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

Stage 1

Measurement of the differential cross section and spin
Stage 1
observables of the Λp scattering with a polarized Λ beam

K1.1

high-pUser Service

J-PARC Annual Report 2022

60
(Co-)
Spokespersons

Affiliation

Title of the experiment

Approval status(PAC recommendation)

Beamline

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 spectrometerhigh-pP92

F.Sakuma

RIKEN

Proposal for the E80 Phase-I Experiment:Investigation ofDeferred.
the KNNN ¯ Bound State Focusing on the Λd Decay

K1.8BR

P93

K.Shirotori

Deferred
Proposal of test experiment to evaluate performances
PAC requests the proponent toOsaka U (RCNP) of secondary beam mode at the high-momentum beamcontinue discussion with the Lab/line
Facility management

E94

T.Gogami

Kyoto U

New generation Λ hypernuclear spectroscopy with the(π+, K+) reaction by S-2S

Stage 1

K1.8

P95

T.Ishikawa

Tohoku U

Pion-induced phi-meson production on the proton

Deferredhigh-p

E96

T.O.Yamamoto JAEA

Measurement of X rays from Ξ- C atom with an active
fiber target system

Stage 2

K1.8

E97

M. Naruki

Kyoto U

Cascade baryon spectroscopy at J-PARC highmomentum beamline

Stage 1high-pT98

K. Yorita

Waseda U

Measurement of Anti-Matter Reaction in Liquid
Argon Time Projection Chamber (LArTPC)

Test Experiment

K1.8BR

Stage 1high-pStatusOrganization and Committees

Organization and Committees

J-PARC Annual Report 2022

62

Organization Structure

J-PARC Annual Report 2022

Organization and Committees

63

Members of the Committees Organized for J-PARC(as of March, 20203
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

Yoshinori Horiuchi

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 2022

643) 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

The University of Tokyo, Japan

Tomofumi Nagae

Kyoto University, Japan

Fuminori Sakuma

RIKEN, Japan

Shinya Sawada

High Energy Accelerator Research Organization (KEK), Japan

Kouji Miwa

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

FC-Cubic, Japan

Kenji Ohoyama

Ibaraki University, Japan

Hideya Anzai

Ibaraki Prefecture, Japan

Mitsuhiro Fukuda

Osaka University, 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 2022

Organization and Committees

655) 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

The University of British Columbia, Canada

Klaus Kirch

ETH Zurich and Paul Scherrer Institute (PSI), Switzerland

Kenya Kubo

International Chiristian University, Japan

Tadayuki Takahashi

The 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

The 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

Hideki Hangai

Japan Atomic Energy Agency (JAEA), Japan

Organization and Committees

J-PARC Annual Report 2022

66
8) 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

Junko Matsumoto

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

Takeshi NakadairaHigh Energy Accelerator Researchi Organization (KEK), Japan

Takeshi Komatsubara

High Energy Accelerator Researchi Organization (KEK), Japan

Hiroshi Takada

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

Kitasato University, 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

Kazuya Aizawa

Japan Atomic Energy Agency (JAEA), Japan

Hiroshi Takada

Japan Atomic Energy Agency (JAEA), Japan

Koichiro Shimomura

High Energy Accelerator Research Organization (KEK), Japan

Yukinobu Kawakita

Japan Atomic Energy Agency (JAEA), Japan

Naritoshi Kawamura

High 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 2022

Organization and Committees

6710) Program Advisory Committee (PAC) for Nuclear and Particle Physics Experiments at the J-PARC 50Gev Proton
Synchrotron(*) Chair
Kenkichi Miyabayashi

Nara Womens' University, Japan

Motoi Endo

High Energy Accelerator Research Organization (KEK), Japan

Hirokazu Ishino

Okayama University, Japan

Takahiro Kawabata

Osaka University, Japan

Hiroaki OhnishiTohoku University, Japan

Makoto Oka

Japan Atomic Energy Agency (JAEA) / Tokyo Institute of Technology, Japan

Kohei Yorita

Waseda University, Japan

Patrick Achenbach

Mainz University, Germany

Vincenzo Cirigliano

University of Washington, USA

Laura Fields

Fermi National Accelerator Laboratory (FNAL), USA

David Jaffe

Brookhaven National Laboratory (BNL), USA

Cristina Lazzeroni

University of Birmingham, UK

Kam-Biu Luk

University of California at Berkley, USA

Horst Lenske

University of Giessen, Germany

Kyungseon Joo

University of Connecticut, 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 2022

70
Present main parameters of Accelerator
Linac
Accelerated Particles
Negative hydrogen
Energy400 MeVPeak Current
50 mA
0.46 ms for MLF
0.50 ms for MR-FX
0.05 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
91196

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 Source
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 Safety Day (May 23)“J-PARC Safety Day,” the important day following
the 2013 radioactive material leak incident at the Hadron Experimental Facility, was held. This year, 350 staff
members participated remotely. After the awards ceremony for safety contributions and best practices, a lecture entitled “Improving Ability to Implement On-site
Safety through Manuals: Safety Ergonomics Approach”
was given by Prof. Akinori KOMATSUBARA of the Facultyof Science and Engineering, Waseda University. Finally,
as a new attempt, the safety implementation activities
at the Accelerator Facilities, Materials and Life Science
Experimental Facility (MLF), Hadron Experimental Facility, and Neutrino Experimental Facility were presented
and discussed by all participants.

“Spark Exciting Science” Sponsored by
KAKENHI Entitled “World of Cutting-Edge
Physics Understood through World’s
Smallest Spinning Top” (June 18)
Nineteen 5th or 6th grade students from local elementary schools, those in nearby prefectures, and thosein Tokyo participated in a part of “Spark ☆ Exciting Science Workshop sponsored by KAKENHI,” a programfor children to spark their interest in the cutting-edge
research being conducted at universities and research
institutions that receive financial support from KAKENHI, and engaged in muon beam practice after learning
about the elementary particle muon.
The participants experimented to visualize a magnetic field created by magnets and coils, observed
the precession movement of a rolling gyroscope andEvents

J-PARC Annual Report 2022

72
a handmade spinning top, and built cloud chambers
to capture and observe cosmic rays. They also learned
about J-PARC, visited the Muon Science Laboratory, andexperienced the irradiation of muon beams into a sample. Remarkably, they are the first elementary school
students to participate in a muon beam experiment at
the MLF.

construct the Ibaraki BNCT (iBNCT), a treatment device
with a 6-m-long linac at the Ibaraki Neutron Medical Research Center (Shirakata, Tokai-mura). After conducting
experiments on phantoms, etc., the iBNCT is undergoing non-clinical tests on mice and cells.
A total of 50 people from the medical field and thegeneral public attended the event. Even after the session, many enthusiastic questions indicated a high levelof interest.

Eco-Fest Hitachi 2022 (July 23)

Monitoring Muon Irradiation

2022 Neutron Industrial Application Report Meeting (July 14 and 15)
J-PARC Center, Ibaraki Prefecture, CROSS, the Industrial Users Society for Neutron Application, and JAEA’s
JRR-3, which joined as an organizer, held the “Neutron
Industrial Application Debriefing Session” at the Akihabara Convention Hall in Tokyo. Over the two days,
141 people attended in person, and 159 attended via
the Internet. The results of the newly started joint research at the MLF and JRR-3 were presented, as well as
the efforts and contributions to solving issues demanded by society, such as carbon neutrality and DX.

J-PARC Hello Science “Boron Neutron Capture Therapy (BNCT)” (June 24)
Hello Science in June was held at AYA’S LABORATORY Quantum Beam Research Center (AQBRC) with an
online combination, and Dr. Fujio Naito, Deputy Director of J-PARC, was the lecturer.
BNCT (Boron Neutron Capture Therapy = irradiationof neutrons to boron drugs, which have the propertyof accumulating only in cancer cells, to destroy cancer
cells) is a type of radiation therapy for cancer. It is being
touted as a powerful new treatment method that allows for pinpoint treatment, requires only a single shortcourse of radiation, and is effective against refractory
cancers. In developing the small accelerator to be installed in hospitals, the technical expertise of the highintensity linear accelerator (linac) at J-PARC was used to“Eco-Fest Hitachi 2022, one of the largest environmental events in Ibaraki Prefecture for learning throughexperimentation and hands-on experience, was held atthe Hitachi Civic Center for the first time in three years.
About 50 companies, organizations, schools, and othergroups presented their environmental activities andshowcased their ecological products at various booths.
J-PARC exhibited a superconducting coaster, which wasso popular that visitors had to wait for their turns to try
it out, a model of J-PARC, posters, etc., and attracted
nearly 400 visitors.

Superconductive roller coasters affected kids.

“Let’s Make a Spinning Top Tilting andTurning” at Tokai Village Enjoy Summer
School 2022 (July 22 and August 2)
In the Enjoy Summer School organized by Tokai Village, J-PARC held lectures on making a top as last year.
16 and 13 fifth and sixth graders gathered at the Tokai
Village Library on July 22 and August 2, respectively.
They learned about the relationship between electricity and magnetism. They confirmed that the rotationof the axis of the tops changed when the tops were rotated while tilted or by changing the center of gravityof the tops through the experiments. The lecturer explained that precessional motion was similar to the spin
behavior of elementary particles studied at J-PARC.

J-PARC Annual Report 2022

Events73
mally unavailable talks by researchers, broadcast via
YouTube and niconico Live Broadcast. During the open
house, “Hello Science”, the monthly science café, wasalso held, where Dr. Tsutomu Fukuda, designated assistant professor at the Institute of Materials and Systems
for Sustainability Advanced Measurement Technology
Center Elementary Particle Measurements Section of
Nagoya University, gave a lecture on “Studying Particle
Neutrinos and the Mysteries of the Universe with Photographic Film”.
Observing various light sources with polarization microscopes“Let’s Make a Kaleidoscope of Light” Craft
Class on Kids’ Kasumigaseki Field Trip Day
2022 (August 3 and 4)
The “Kids’ Kasumigaseki Field Trip Day” is a collaborative event among government ministries and agencies
in Kasumigaseki to provide children with opportunities
to experience and learn about society during their summer vacations. Over the two days, 265 parents and children gathered at the JAEA booth on-site to learn about
the principles of spectroscopy by making light kaleidoscopes, which were assembled by drilling star-shaped
holes in black paper and folding the cardboard to see
rainbow-colored light coming out of the holes, and bylisting the similarities and differences in the diffusion oflight and the arrangement of colors.

J-PARC Online Facility Open House 2022
(August 27)
The J-PARC Open House, titled “Only Online! The
Deepest Part of J-PARC!” was held through a combination of live broadcasts and pre-recorded videos fromthe accelerator and experimental facilities to provide
programs showing the deepest part of J-PARC with nor-Live Broadcasting from Hadron Experimental Facility

JASIS 2022 Exhibition at Makuhari Messe
International Exhibition Hall (September
7-9)
The Materials and Life Science Experimental Facility(MLF) at J-PARC and the JRR-3 research reactor at JAEA
participated in JASIS 2022, Japan’s leading exhibitionof scientific instruments, analytical systems, and solutions. The ultra-high vacuum pump made of titanium
developed at the Accelerator Division of J-PARC attracted many visitors. Nearly 1,500 people visited our booth
during the exhibition, many of whom listened intently
to the researchers’ explanations.

11th International Workshop on Sample
Environment at Scattering Facilities (August 28-September 1)“11th International Workshop on Sample Environment at Scattering Facilities” was held at Nasu in Tochigi Prefecture, jointly organized by the J-PARC Center,
Center of Neutron Science for Advanced Materials of
Tohoku University, Comprehensive Research Organization for Science and Society, Frontier Research Center
for Applied Atomic Sciences of Ibaraki University, Institute for Solid State Physics of the University of Tokyo,
Japan Synchrotron Radiation Research Institute, KEK Institute of Materials Structure Science, and Materials Science Research Center of Japan Atomic Energy Agency.

Group photo in front of the hotel where the workshop was held

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Eighty-seven researchers and engineers participated in
the workshop and contributed oral and poster presentations on the current operation status of the sample
environment and the development of new technologies.

J-PARC Workshop “Progress for Fundamental Physics with Neutrons” (September 28-29)
The J-PARC Center, the Institute of Materials Structure Science of the High Energy Accelerator Research
Organization (KEK), and the Institute of Particle andNuclear Studies of KEK jointly hosted “Progress for
Fundamental Physics with Neutrons” at the KEK Tokai
Building No.1 and the J-PARC Research Building. The
workshop was held in a hybrid format with 15 on-site
and 45 remote participants. A total of 16 presentations
were made from Japan and abroad, and participants
discussed future research directions, applications of the
new instruments, and measurement techniques developed for materials.

making a mysterious spinning top!” The participants
were 14 students from elementary school’s first to sixth
grades. They rotated the gyroscope and experimented
to see what happened when they changed the center of gravity of the handmade top. The lecturer was
Dr.Tsutomu Mibe of the Particle and Nuclear Physics
Division.

Workshop at Open house of QST in Naka
(October 16)
The J-PARC Center conducted a workshop, “Let’s
Make a Kaleidoscope of Light,” at the Naka Fusion Institute of the National Institutes for Quantum Scienceand Technology open house event. 171 parents andchildren gathered at the J-PARC booth to learn about
spectroscopy’s principles and enjoy making “Kaleidoscopes of Light” crafts.

Workshop at Ozora Marche 2022 in Tokai
Village (October 1)
The autumn “Ozora Marche” event was held in Tokai
Village for the first time in four years, and the J-PARC
Center exhibited crafting lessons for bead bands thatchange color under ultraviolet light and a superconducting coaster in the children’s corner. More than 500
parents and children visited our booth and had fun withthe mysterious behavior of superconducting materials.

Observing various kinds of lights with handmade kaleidoscopes

J-PARC Center and ESS ERIC (European
Spallation Source ERIC) Celebrate Renewal of Cooperation Agreement in Field of
Spallation Neutron Source Development
The renewed cooperation agreement between the
J-PARC Center and ESS in the field of spallation neu-

Experience of Mysterious Behavior of Superconducting Material

Lecture at KIPP Nakameguro, Children’s
After-school Care Program at Nakameguro Elementary School (October 8)
The J-PARC Center held a lecture titled “World’s
Smallest? Let’s get to know the elementary particles byKobayashi, Director of the J-PARC Center, and Schober, Director General of the ESS handling over the signed agreement.

J-PARC Annual Report 2022

Events75
tron source development, which aims to utilize eachother’s potential for further development in this field
through the exchange of information and technology
and the human resources, was signed on June 8, 2022.
On October 10, a ceremony to extend the agreement
was held in Lund, Sweden, where ESS is located, in thepresence of the Japanese Ambassador to Sweden, Mr.
Noke Masaki. The signed agreement was handed overbetween Dr. Kobayashi, Director of J-PARC Center, and
Dr. Schober, Director General of ESS.

lecture was also held to explain recent achievements
to the public. The event was attended by about 70 participants, with 23 oral presentations and three generallectures.

J-PARC Photo Contest 2022
The annual fall J-PARC Photo Contest, now in its
ninth year, received 34 entries from J-PARC staff, users, and others. After careful selection, one Grand Prizewinner, two Excellence Award winners, and seven Honorable Mentions were selected. The Grand Prize wasawarded to Mr. Masahiko Uota of Accelerator Section
5 for his work entitled “Do specular reflection images
in a vacuum duct dream of ray-tracing in a quadrupole
magnet?”Group photo at the general lecture of the Symposium for the
Integration of Humanities and Science

22nd Science Festival for Youth in Hitachi, “Are Magnets and Electricity Good
Friends?” (October 23, Hitachi Civic Center)
The 22nd Science Festival for Youth in Hitachi washeld on-site for the first time in three years. The J-PARC
booth offered a craft workshop on constructing amonopole motor. Dr. Tomohiro Takayanagi explained
how the copper wire turns with Fleming’s left-handrule. He also explained that the accelerators at J-PARC
operate on the same principle. The children enjoyed theexperiment by reversing the magnet’s poles and changing the copper wire’s shape. They learned how magnets
and electricity can work together to create motion.

Excellence Award“The art inside the ion pump” by Mr.Masahiko Uota

7th Symposium on Integration of Humanities and Science (November 2 and 3)
The world’s most intense negative muon beam,
generated at J-PARC’s MLF, is being used to study cultural artifacts. The KEK Institute of Materials Structure
Science organized the “Symposium on Integrationof Humanities and Science” to promote collaboration
between cultural heritage researchers and quantum
beam researchers. The 7th symposium, “Exploring History with Quantum Beams,” featured presentations by
experts in archaeology, cultural heritage research, andquantum beams. The symposium aimed to facilitate a
non-destructive analysis of cultural heritage. A general

Dr. Takayanagi explains the principle of single-pole motor.

SACRIE☆School “Let’s Investigate Elementary Particles through Experiments with
Tops!” at Hitachi Civic Center (November 5)
Dr. Masashi Otani of Accelerator Section Seven
gave lessons to the science experiment class organizedby the Hitachi Civic Center Science Museum (SACRIE).

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Eight groups of 16 parents and children from the general public attended the morning session. Seventeen
children from the Japan Space Youth League of the
Hitachi Civic Center Division participated in the afternoon session. Through experiments with compasses,
magnets, and gyroscopes, the children had fun learning about the properties of magnets, electric current,
and precession.

Won Science Award at 5th Science PhotoContestMr. Masahiko Uota of Accelerator Section V, Accelerator Division won the Science Award in the General
Category at the 5th Science Photo Contest sponsored by
the Union of Organization on Science and Technology(UOST) and co-sponsored by the Ministry of Education,
Culture, Sports, Science, and Technology. His photo work
was entitled “Do specular reflection images in quadrupole magnet ducts dream of ray tracing?” and also won
the Grand Prize in the J-PARC Photo Contest 2022.

currents using a directional magnet, observing precession using a gyroscope, and creating a state in which noprecession occurs by shifting the center of gravity usinga handmade spinning top.

17th Tokai Forum “Towards Social Implementation of Research and Development
Achievements" (February 9)
The Tokai forum is held annually to help local residents understand the activities of the Tokai Area of theJapan Atomic Energy Agency (JAEA). This year, the forum was held face-to-face for the first time in four years,
and 100 people attended the event at the Tokai Culture
Center, which was also streamed online. The director of
the J-PARC Center Kobayashi gave an overview of theaccelerators and neutron experiments. Then, Dr. Kamiya, Sub Leader of Accelerator Section Ⅲ, presented
a report titled "Development of Energy-Saving andSpace-saving Ultra-High Vacuum Pumps Using Vacuum
Technology of J-PARC Accelerator.”

T2K Collaboration Meeting Held (February 6-10)“Do specular reflection images in quadrupole magnet ducts
dream of ray tracing?” by Mr. Masahiko Uota

A T2K Collaboration Meeting was held at the AYA’SLABORATORY Quantum Beam Research Center (AQBRC). This was the first on-site meeting in the past
three years, and 115 collaborators, including researchers from overseas, participated. The neutrino beam period is scheduled to start in April after a two-year-long
shutdown for the Main Ring (MR) upgrade. In the near
future, the neutrino beam power will exceed 750 kW,
which is the first goal since the start of the experimentin 2009. The upgrade of the nearby detectors at the JPARC site is also underway. These developments werereported and actively discussed at the meeting.

Experimental Workshop “Let’s Make Spinning Top Spinning on Tilted!” at Tama Rokuto Science Museum at Tama Rokuto
Science Museum (January 15)
The J-PARC Center, together with KEK and Tamarokuto Science Center, hosted a science experiment event
to make a spinning top spin on tilted and investigate
the relationship between electricity and magnets. The
workshop, conducted by Dr. Masashi Otani of the Accelerator Division of J-PARC Center and Ms. Yuka Ibaraki
of Nagoya University, was held for students from 4th
grade to high school. Nine students attended both themorning and afternoon classes and enthusiasticallyparticipated in experiments on magnets and electricGroup photo of attendees

J-PARC Annual Report 2022

Events77

J-PARC Hello Science "Story of Vacuum
Aiming Toward Complete Emptiness"(February 24)
Dr. Junichiro Kamiya of the Accelerator Division
Section Ⅲ gave the February Hello Science lecture. He
introduced the over 2,000 years long history of vacuums starting with the ancient Greeks. In the 17th century, a series of experiments were conducted in Europe
to prove the existence of vacuum. One of them, theMagdeburg hemisphere experiment, was demonstrated by the participants of this lecture. Dr. Kamiya also
explained the vacuum technology that aimed to almost
empty and the application of this technology. He also
introduced the possibility of applying the technology
to various industries, such as medicine and logistics.

3rd International Workshop on Hadron
Facility Expansion Project (March 14-16)
The workshop consisted of a plenary session andthree parallel sessions on hadron physics, strangenessnuclear physics, and flavor physics, the main researchareas at the J-PARC Hadron Experimental Facility (HEF)
was held at AQBRC, KEK Tokai 1st Building and online.
Eighty-nine talks were presented, discussing the extension project of HEF and the latest state of physics research, both experimental and theoretical aspects. Of
the 188 registered participants, 59 were from foreign
institutions, about 60 were present in person, and ten
came from overseas.

Group photo of online participants

Visitors
David Gurgenidze, Rector of Georgian Technical University (November 4th)
Magdeburg hemisphere experiment

Quantum Beam Science Festa 2022 withthe 14th MLF Symposium and the 40th
PF* Symposium (March 13-15)
The Quantum Beam Science Festa, consisting of
the MLF Symposium and the PF, KEK Photon Factory,
Symposium, is held annually under the auspices of the
KEK Institute for Materials Structure Science, the J-PARC
Center, the Comprehensive Research Organization for
Science and Society (CROSS), the PF Users Association(PF-UA), and the J-PARC MLF Users Society. For the firsttime in a long time, the Quantum Beam Science Festa
was held in person with about 400 participants at Tsukuba International Conference Center and online with
475 participants. The MLF Symposium was held online
with about 290 participants. The Quantum Beam Science Festa featured two keynote lectures, six parallelsessions, and about 230 poster presentations, with the
keynote lectures broadcast online and attended bymore than 100 accounts.

Beate Heinemann, Director of Particle Physics ofDeutsches Elektronen-Synchrotron DESY (November
11th)
George Freeman, Minister for Science, Research and Innovation, Department for Business, Energy and Industrial Strategy (December 14th)
Abdul Rahim Bin Harun, Director General of Malaysian
Nuclear Agency (March 14th)

Events

J-PARC Annual Report 2022

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There were 1,102 visitors to J-PARC for the period from April 2022 to the end of March 2023.

International Visitors
10%

ln-house
12%

Public Officers
11%

Junior-high / High school
students, teachers
7%

VIP, Lawmakers
2%
Business
21%
University
students, experts
33%

Local Residents
4%

Publications

Publications

J-PARC Annual Report 2022

80

Publications in Periodical Journals
A-001
M. Otani
Muon cooling and acceleration
AAPPS bulletin, 32, 6 (2022)
A-002
K. Ohishi, et al.
Operando Muon Spin Rotation andRelaxation Measurement on LiCoO2 Half-CellACS Appl. Energy Mater., 5, 12538–12544 (2022).
A-003
H. Kawaura, et al.
Effects of Lithium Bis(oxalate)Borate
Electrolyte Additive on the Formation of a
Solid Electrolyte Interphase on Amorphous
Carbon Electrodes by Operando Time-Slicing
Neutron Reflectometry
ACS Appl. Mater. Interfaces, 14, 24526–24535(2022).
A-004
T. T. Chuong, et al.
Giant Carbon Nano-Test Tubes as Versatile
Imaging Vessels for High-Resolution and insitu Observation of Proteins
ACS Appl. Mater. Interfaces, 14, 26507–26516(2022).
A-005
W. Yoshimune, et al.
Interfacial Distribution of Nafion Ionomer
Thin Films on Nitrogen-Modified Carbon
Surfaces
ACS Appl. Mater. Interfaces, 14, 53744–53754(2022).
A-006
M. Inutsuka, et al.
Effect of Oligomer Segregation on the
Aggregation State and Strength at the
Polystyrene/Substrate Interface
ACS Macro Lett., 11, 504–509 (2022).
A-007
E. Saiki, et al.
Evidence of Long Two-Dimensional Folding
Chain Structure Formation of Poly(vinylidene
fluoride) in N -Methylpyrrolidone Solution:
Total Form Factor Determination by
Combining Multiscattering DataACS Omega, 7, 22825–22829 (2022).
A-008
E. Saiki, et al.
Elongated Rodlike Particle Formation of
Methyl Cellulose in Aqueous Solution
ACS Omega, 7, 28849–28859 (2022).
A-009
K. Ohishi, et al.
Hard Carbon Studied with Positive Muon
Spin Rotation and Relaxation
ACS Phys. Chem. Au, 2 98–107 (2022).

A-010
T. Kawasaki, et al.
Rearrangement of Hydrogen Bonds in
Dehydrated Raffinose Tetrahydrate: A Timeof-Flight Neutron Diffraction Study
Acta Crystallogr. Sect. C Struct. Chem., 78,
743–748 (2022).

Bragg Edge Neutron Imaging
Acta Mater., 239, 118259 (2022).
A-019
Q. Li, et al.
Large Tunable Thermal Expansion in
Ferroelastic Alloys by Stress
Acta Mater., 240, 118350 (2022).

A-011
Y. Terasawa, et al.
Single-Crystal Structure Analysis of NonDeuterated Triglycine Sulfate by Neutron
Diffraction at 20 and 298 K: A New Disorder
Model for the 298 K Structure
Acta Crystallogr. Sect. E Crystallogr. Commun.,78, 306–312 (2022).

A-020
B. Guo, et al.
Unexpected Dynamic Transformation fromα Phase to β Phase in Zirconium Alloy
Revealed by in-situ Neutron Diffraction
during High Temperature Deformation
Acta Mater., 242, 118427 (2022).

A-012
T. Chatake, et al.
Protonation States of Hen Egg-White
Lysozyme Observed Using D/H Contrast
Neutron Crystallography
Acta Crystallogr. Sect. Struct. Biol., 78, 770–778(2022).

A-021
T. Sawaguchi, et al.
Evidence Supporting Reversible Martensitic
Transformation under Cyclic Loading on
Fe–Mn–Si–Al Alloys Using in situ Neutron
Diffraction
Acta Mater., 242, 118494 (2022).

A-013
K. Okada, et al.
Effect of Hydrogen on Evolution ofDeformation Microstructure in Low-Carbon
Steel with Ferrite Microstructure
Acta Mater., 225, 117549 (2022).

A-022
K. Ozawa, et al.
Towards the Measurement of the Mass
Modifications of Vector Mesons in a Finite
Density Matter
Acta Physica Polonica A 142, 399-401 (2022)

A-014
D. Wei, et al.
Metalloid Substitution Elevates
Simultaneously the Strength and Ductility ofFace-Centered-Cubic High-Entropy Alloys
Acta Mater., 225, 117571 (2022).

A-023
X. Xu, et al.
Tough Yet Flexible Superelastic Alloys Meet
Biomedical Needs
Adv. Mater. Process., 180 35–37 (2022).

A-015
M. Liu, et al.
Achieving Excellent Mechanical Properties
in Type 316 Stainless Steel by Tailoring
Grain Size in Homogeneously Recovered or
Recrystallized Nanostructures
Acta Mater., 226, 117629 (2022).
A-016
K. Sakaki, et al.
Displacement of Hydrogen Position in DiHydride of V-Ti-Cr Solid Solution Alloys
Acta Mater., 234, 118055 (2022).
A-017
R. Zheng, et al.
Rediscovery of Hall-Petch Strengthening in
Bulk Ultrafine Grained Pure Mg at Cryogenic
Temperature: A Combined in-situ Neutron
Diffraction and Electron Microscopy Study
Acta Mater., 238, 118243 (2022).
A-018
R. S. Ramadhan, et al.
Mechanical Surface Treatment Studies by

A-024
M. Ohira, et al.
Star‐Polymer–DNA Gels Showing Highly
Predictable and Tunable Mechanical
Responses
Adv. Mater., 34, 2108818 (2022).
A-025
T. Odaira, et al.
Flexible and Tough Superelastic Co–Cr Alloys
for Biomedical Applications
Adv. Mater., 34, 2202305 (2022).
A-026
K. Okamoto, et al.
Impact of Na Concentration on the Phase
Transition Behavior and H− Conductivities in
the Ba–Li–Na–H–O Oxyhydride System
Adv. Sci., 10, 2203541 (2022).
A-027
E. Nomura, et al.
Magnetization Process of Cubic Fe3O4
Submicron Particles Studied by Polarized
Small-Angle Neutron Scattering
AIP Adv., 12, 035034 (2022).

J-PARC Annual Report 2022

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81
A-028
T. Ohashi, et al.
Structure of Basaltic Glass at Pressures up to
18 GpaAm. Mineral., 107, 325–335 (2022).
A-029
K. Kino, et al.
Nondestructive Quantitative Imaging for
Spatially Nonuniform Degradation in a
Commercial Lithium-Ion Battery Using a
Pulsed Neutron BeamAppl. Phys. Express, 15, 027005 (2022).
A-030
K. Hayashi, et al.
Determination of Site Occupancy of Boronin 6H–SiC by Multiple-Wavelength Neutron
Holography
Appl. Phys. Lett., 120, 132101 (2022).
A-031
K. Akutsu-Suyama, et al.
New Design of a Sample Cell for Neutron
Reflectometry in Liquid–Liquid Systems and
Its Application for Studying Structures at
Air–Liquid and Liquid–Liquid Interfaces
Appl. Sci., 12, 1215 (2022).
A-032
Y. Hirota, et al.
Hydrogen Dynamics in Hydrated Chitosan
by Quasi-Elastic Neutron Scattering
Bioengineering, 9, 599 (2022).
A-033
T. Sogabe, et al.
Effect of Water Activity on the MechanicalGlass Transition and Dynamical Transition ofBacteria
Biophys. J., 121, 3874–3882 (2022).
A-034
Y. Kameda, et al.
Neutron Diffraction with 34 S/ nat S Isotopic
Substitution Method on the Solvation
Structure of S8 Molecule in Concentrated
CS2 Solutions
Bull. Chem. Soc. Jpn., 95, 1481–1485 (2022).
A-035
S. H. Song, et al.
Rational Design of Li Off-Stoichiometric NiRich Layered Cathode Materials for Li-Ion
Batteries
Chem. Eng. J., 448, 137685 (2022).
A-036
A. Hoshikawa, et al.
Observation of Hydrogen Bonding Network
in Hydrogen Sulfide Hydrate Using Neutron
Diffraction
Chem. Phys. Lett., 812, 140274 (2022).
A-037
L. Zheng, et al.
Universal Dynamical Onset in Water atDistinct Material Interfaces
Chem. Sci., 13, 4341–4351 (2022).
A-038
C. Tsutsumi-Arai, et al.
Antimicrobial Surface Processing ofPolymethyl Methacrylate Denture BaseResin Using a Novel Silica-Based Coating
Technology
Clin. Oral Investig., 27, 1043–1053 (2022).
A-039
N. V. Mdlovu, et al.
Design of Doxorubicin Encapsulated pH-/
Thermo-Responsive and Cationic ShellCrosslinked Magnetic Drug Delivery System
Colloids Surf. B Biointerfaces, 209, 112168 (2022).
A-040
M. Akamatsu, et al.
Controlled Recombination Rate of Lophyl
Radicals in Cationic Surfactant Micelles
Colloids Surf. Physicochem. Eng. Asp., 638,
128319 (2022).
A-041
Y. Furuike, et al.
Cross-Scale Analysis of Temperature
Compensation in the Cyanobacterial
Circadian Clock System
Commun. Phys., 5, 75 (2022).
A-042
K. Komatsu
Neutrons Meet Ice Polymorphs
Crystallogr. Rev., 28 224–297 (2022).
A-043
J. Kamiya, et al.
Evaluation of titanium vacuum chamber asgetter pumpe-Journal of Surface Science andNanotechnology (Internet), 20(2), p.107 - 118,
2022/05
A-044
Y. Hino, et al.
Characterization of the correlated
background for a sterile neutrino searchusing the first dataset of the JSNS2experimentEur. Phys. J. C 82, 331(2022)
A-045
A. Abed Abud, et al.
Scintillation light detection in the 6-m driftlength ProtoDUNE Dual Phase liquid argon
TPC
Eur. Phys. J. C 82, 618(2022)
A-046
K. Abe, et al.
Separation of track- and shower-likeenergy deposits in ProtoDUNE-SP using a
convolutional neural network
Eur. Phys. J. C 82, 903 (2022)

A-047
M. Shibata, et al.
Micellar Aggregation and Thermogelation ofAmphiphilic Random Copolymers in Water
Hierarchically Dependent on Chain Length
Eur. Polym. J., 168, 111091 (2022).
A-048
N. Kitamura, et al.
Effects of Ca Substitution on the Local
Structure and Oxide–Ion Behavior of Layered
Perovskite Lanthanum Nickelate
Front. Mater., 9, 954729 (2022).
A-049
D. Gong, et al.
Nematic Fluctuations in the NonSuperconducting Iron Pnictide BaFe1.9−x Ni0.1
CrxAs2
Front. Phys., 10, 886459 (2022).
A-050
K. Yamashita, et al.
Improvement of Nano-Polycrystalline
Diamond Anvil Cells with Zr-Based Bulk
Metallic Glass Cylinder for Higher Pressures:
Application to Laue-TOF Diffractometer
High Press. Res., 42, 121–135 (2022).
A-051
T. Hattori, et al.
Development of a Hybrid Piston Cylinder
Cell for Quasielastic Neutron Scattering
Experiments up to 1 GPa
High Press. Res., 42, 226–235 (2022).
A-052
S. Machida, et al.
Investigation of Null-Matrix Alloy Gaskets
for a Diamond-Anvil-Cell on High Pressure
Neutron Diffraction Experiments
High Press. Res., 42, 303–317 (2022).
A-053
H. Iimura, et al.
Design of a Strong X-Y Coupling BeamTransport Line for J-PARC Muon g-2/EDM
ExperimentIEEE Trans. Appl. Supercond., 32, 4004705 (2022)
A-054
M. Abe, et al.
Design Method of Active Shield Steering
Magnet for Fine Tuning of Muon Injection
Orbit Into g-2/EDM Precision Measurements
MagnetIEEE Trans. Appl. Supercond., 32, 4007505 (2022)
A-055
N. Sumi, et al.
Construction Status of the Superconducting
Magnet System for the COMET ExperimentIEEE Trans. Appl. Supercond., 32, 4101204 (2022)
A-056
K. Oda, et al.
Developments of a Pulse Kicker System forPublications

J-PARC Annual Report 2022

82
the Three-Dimensional Spiral Beam Injectionof the J-PARC Muon g-2/EDM ExperimentIEEE Trans. Appl. Supercond., 32, 4101504 (2022)
A-057
M. Yoshida, et al.
Repetitive Irradiation Tests at Cryogenic
Temperature by Neutrons and Protons on
Stabilizer Materials of Superconductor
IEEE Trans. Appl. Supercond., 32, 7100405 (2022)
A-058
K. Sasaki, et al.
Development of Precise Shimming
Technique With Materials Having Low
Saturation Magnetization
IEEE Trans. Appl. Supercond., 32, 9002107 (2022)
A-059
H. Tada, et al.
Development of Magnetic Field Mapping
System for the MuSEUM Experiment With
High Precision Using CW-NMR Probes
IEEE Trans. Appl. Supercond., 32, 9002205 (2022)
A-060
H. Iinuma, et al.
Design of a Strong X-Y Coupling BeamTransport Line for J-PARC Muon g-2/EDM
Experimen
IEEE Trans. Appl. Supercond., 32, 4004705 (2022)
A-061
H. Hirayama, et al.
Control of the Rotatable-Quadrupole
Magnet Angle for a 3-D Spiral Injection Test
ExperimentIEEE Trans. Appl. Supercond., 32, 4005705 (2022)
A-062
M. Abe, et al.
Design Method of Active Shield Steering
Magnet for Fine Tuning of Muon Injection
Orbit Into g-2/EDM Precision Measurements
MagnetIEEE Trans. Appl. Supercond., 32, 4007505 (2022)
A-063
Y. Fuwa, et al.
Development of Combined-Function
Multipole Permanent Magnet for HighIntensity Beam Transportation
IEEE Trans. Appl. Supercond., 32, 6, 4006705(2022)A-064
T. Takayanagi, et al.
Evaluation of Eddy Currents Dependent
on Excitation Pattern in Design of Pulse
Electromagnets
IEEE Trans. Appl. Supercond.,. 32, 6, 1401405(2022)A-065
Y. Iwamiya, et al.
Photocatalytic Silica–Resin Coating forEnvironmental Protection of Paper as a

Plastic SubstituteInd. Eng. Chem. Res., 61, 6967–6972 (2022).
A-066
K. Takaya, et al.
A Real-Time Gas Monitoring System Basedon Ion Mobility Spectrometry for Workplace
Environmental Measurements
Ind. Health, 60, 40–46 (2021).
A-067
T. Yajima, et al.
High-Pressure Synthesis of TransitionMetal Oxyhydrides with Double-Perovskite
Structures
Inorg. Chem., 61, 2010–2016 (2022).
A-068
M. K. Sugumar, et al.
Preparation of Li-Excess and Li-Deficient
Antiperovskite Structured Li2+xOH1–xBr and
Their Effects on Total Ionic Conductivity
Inorg. Chem., 61, 4655–4659 (2022).
A-069
Y. Yasuda, et al.
Visualization of the Working Fluid in a
Flat-Plate Pulsating Heat Pipe by NeutronRadiography
Int. J. Heat Mass Transf., 185, 122336 (2022).
A-070
D. Wei, et al.
Mechanical Behaviors of Equiatomic and
Near-Equiatomic Face-Centered-Cubic Phase
High-Entropy Alloys Probed Using in situ
Neutron Diffraction
Int. J. Plast., 158, 103417 (2022).
A-071
D. Wei, et al.
Si-Addition Contributes to Overcoming theStrength-Ductility Trade-off in High-Entropy
AlloysInt. J. Plast., 159, 103443 (2022).
A-072
Y. Oba, et al.
Characterization of Deformation by Cold
Rolling in Ferritic Steel Containing Cu
Particles Using Neutron Transmission
Analysis
ISIJ Int., 62, 173–178 (2022).
A-073
S. Harjo, et al.
Revisit Deformation Behavior of LathMartensite
ISIJ Int., 62, 1990–1999 (2022).
A-074
M. Koyama, et al.
Microstructure and Plasticity Evolution
During Lüders Deformation in an Fe-5Mn0.1C Medium-Mn SteelISIJ Int., 62, 2036–2042 (2022).

A-075
M. Koyama, et al.
Hierarchical Deformation Heterogeneity
during Lüders Band Propagation in an
Fe-5Mn-0.1C Medium Mn Steel Clarified
through in situ Scanning Electron
Microscopy
ISIJ Int., 62, 2043–2053 (2022).
A-076
H. Sato, et al.
Visualising Martensite Phase Fraction in Bulk
Ferrite Steel by Superimposed Bragg-Edge
Profile Analysis of Wavelength-Resolved
Neutron Transmission Imaging
ISIJ Int., 62, 2319–2330 (2022).
A-077
H. Uchima, et al.
Impact of Dislocation Density and Mobility
on Yielding Behavior in Quenched MediumCarbon Martensitic Steel Tempered at Low
Temperature
ISIJ Int., 62, 998–1003 (2022).
A-078
T. Murakawa, et al.
Re-Evaluation of Protein Neutron
Crystallography with and without X-Ray/
Neutron Joint Refinement
IUCrJ, 9, 342–348 (2022).
A-079
Z. Deng, et al.
Multifunctional Nanostructured NiTi Alloywith Invar, Elinvar and Rinvar Properties
J. Alloys Compd., 909, 164682 (2022).
A-080
D. Yun, et al.
Stress Contribution of B2 Phase in
Al0.7CoCrFeNi Eutectic High Entropy Alloy
J. Alloys Compd., 918, 165673 (2022).
A-081
K. Fukui, et al.
Room-Temperature Fast H– Conduction in
Oxygen-Substituted Lanthanum Hydride
J. Am. Chem. Soc., 144, 1523–1527 (2022).
A-082
T. Kumada, et al.
Structure Analysis of a Buried Interface
between Organic and Porous Inorganic
Layers Using Spin-Contrast-Variation
Neutron Reflectivity
J. Appl. Crystallogr., 55, 1147–1153 (2022).
A-083
K. Ikeda, et al.
Pressure Cells for in situ Neutron Total
Scattering: Time and Real-Space Resolution
during Deuterium Absorption
J. Appl. Crystallogr., 55, 1631–1639 (2022).
A-084
F. Malamud, et al.

J-PARC Annual Report 2022

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Non-Destructive Characterization of theSpatial Variation of γ/γ’ Lattice Misfit ina Single-Crystal Ni-Based Superalloy by
Energy-Resolved Neutron Imaging
J. Appl. Crystallogr., 55, 228–239 (2022).
A-085
K. Tatsumi, et al.
Optimization and Inference of Bin Widths for
Histogramming Inelastic Neutron Scattering
SpectraJ. Appl. Crystallogr., 55, 533–543 (2022).
A-086
T. Kawasaki, et al.
Operando Structure Observation of
Pyroelectric Ceramics during Power
Generation Cycle
J. Appl. Phys., 131, 134103 (2022).
A-087
M. Hiraishi, et al.
Ambipolarity of Diluted Hydrogen in WideGap Oxides Revealed by Muon Study
J. Appl. Phys., 132, 105701 (2022).
A-088
Y. Sakuda, et al.
Improved Oxide-Ion and Lower Proton
Conduction of Hexagonal Perovskite-Related
Oxides Based on Ba7Nb4MoO20 by Cr6+
DopingJ. Ceram. Soc. Jpn., 130, 442-447 (2022).
A-089
Y. Mitsuya, et al.
Energy-Resolved Neutron Imaging with
Glass Gas Electron Multiplier and Dynamic
Time-over-Threshold Method
J. Instrum., 17, C01006 (2022).
A-090
A. Abed Abud, et al.
Design, construction and operation of theProtoDUNE-SP Liquid Argon TPC
J. Instrum., 17, P01005 (2022)
A-091
N. Muto, et al.
A Novel Nuclear Emulsion Detector
for Measurement of Quantum Statesof Ultracold Neutrons in the Earth’s
Gravitational Field
J. Instrum., 17, P07014 (2022).

A-094
K. Abe, et al.
Neutron tagging following atmospheric
neutrino events in a water Cherenkov
detectorJ. Instrum., 17, P10029 (2022)
A-095
R. A. Jameson, et al.
Improved bunching and longitudinalemittance control in an RFQ
J. Instrum., 17, P12011 (2022)
A-096
K. Futatsukawa, et al.
Development of the novel and superior
adaptive beam-loading compensation
system calculated in the frequency domain
for the J-PARC Linac
J. Instrum., 17, T11002 (2022)
A-097
W. Gong, et al.
In-situ Observation of Twinning and
Detwinning in AZ31 Alloy
J. Magnes. Alloys, 10, 3418–3432 (2022).
A-098
K. Okamoto, et al.
Stabilization of a High H−-Conducting Phase
via K Doping of Ba–Li Oxyhydride
J. Mater. Chem. A, 10, 23023–23027 (2022).
A-099
D. Wei, et al.
Strengthening of High-Entropy Alloys via
Modulation of Cryo-Pre-Straining-Induced
Defects
J. Mater. Sci. Technol., 129, 251–260 (2022).
A-100
J. Yang, et al.
Mictomagnetism and Suppressed Thermal
Conduction of the Prototype High-Entropy
Alloy CrMnFeCoNi
J. Mater. Sci. Technol., 99, 55–60 (2022).
A-101
H. Abe, et al.
Spontaneous Formations of Nanoconfined
Water in Ionic Liquids by Small-Angle
Neutron Scattering
J. Mol. Liq., 346, 117035 (2022).

A-092
B. Yee-Rendon, et al.
Beam physics design of a 30-MW beamtransport to the target for an acceleratordriven subcritical system
J. Instrum., 17, P10005 (2022)

A-102
W. Q. Zhang, et al.
Structure of an Aqueous RbCl Solution in
the Gigapascal Pressure Range by Neutron
Diffraction Combined with EmpiricalPotential Structure Refinement Modeling
J. Mol. Liq., 348, 118080 (2022).

A-093
K. Abe, et al.
Scintillator ageing of the T2K near detectors
from 2010 to 2021
J. Instrum., 17, P10028 (2022)

A-103
T. Yamaguchi, et al.
Neutron Scattering on an Aqueous Sodium
Chloride Solution in the Gigapascal Pressure
Range

J. Mol. Liq., 365, 120181 (2022).
A-104
K. Yoshida, et al.
The Translational, Rotational, and Phonon
Dynamics of Water in ZrO2 /Water Nanofluid
J. Mol. Liq., 366, 120218 (2022).
A-105
R. Motokawa, et al.
Nanoscopic Structure of Borosilicate Glasswith Additives for Nuclear Waste Vitrification
J. Non-Cryst. Solids, 578, 121352 (2022).
A-106
D. Ito, H, et al.
Spatial Distribution and Preferred
Orientation of Crystalline Microstructure of
Lead-Bismuth Eutectic
J. Nucl. Mater., 569, 153921 (2022).
A-107
G. Ariyoshi, et al.
Development of a miniature electromagnet
probe for the measurement of local velocity
in heavy liquid metals
J. Nucl. Sci. Technol., 59, 1071 (2022)
A-108
G. Rovira, et al.
KeV-Region Analysis of the Neutron Capture
Cross-Section of 237Np
J. Nucl. Sci. Technol., 59, 110–122 (2022).
A-109
K. Yamamoto, et al.
Design and actual performance of J-PARC
3 GeV rapid cycling synchrotron for highintensity operation
J. Nucl. Sci. Technol., 59, 1174 - 1205 (2022)
A-110
H. Nakano, et al.
Development of a neutron beam monitor
with a thin plastic scintillator for nuclear
data measurement using spallation neutron
sourceJ. Nucl. Sci. Technol., 59, 1499-1506 (2022).
A-111
S. Endo, et al.
Neutron Capture and Total Cross-Section
Measurements and Resonance Parameter
Analysis of Niobium-93 below 400 EV
J. Nucl. Sci. Technol., 59, 318–333 (2022).
A-112
G. Rovira, et al.
KeV-neutron capture cross-section
measurement of 197Au with a Cr-filteredneutron beam at the ANNRI beamline of
MLF/J-PARC
J. Nucl. Sci. Technol., 59, 647-655 (2022).
A-113
H. Iwamoto, et al.
Measurement of 107-MeV proton-induced

Publications

J-PARC Annual Report 2022

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double-differential thick target neutron
yields for Fe, Pb, and Bi using a fixed-field
alternating gradient accelerator at Kyoto
University
J. Nucl. Sci. Technol., 60, 435 (2022)
A-114
G. Rovira, et al.
241Am Neutron Capture Cross Section in the
KeV Region Using Si and Fe-Filtered Neutron
Beams
J. Nucl. Sci. Technol., 60, 489–499 (2022).
A-115
A. Kimura, et al.
Neutron Total and Capture Cross-Section
Measurements of 155Gd and 157Gd in the
Thermal Energy Region with the Li-Glass
Detectors and NaI(Tl) Spectrometer Installedin J-PARC·MLF·ANNRI
J. Nucl. Sci. Technol., 60, 678–696 (2022).
A-116
M. Uyama, et al.
Neutron Reflectometry & Simultaneous
Measurements of Rheology and Small Angle
Neutron Scattering Studies for Polyether
Modified Silicone Vesicle Systems
J. Oleo Sci., 71, 1625–1637 (2022).
A-117
T. Tominaga, et al.
Experimental Evidence of Slow Mode Waterin the Vicinity of Poly(ethylene oxide) at
Physiological Temperature
J. Phys. Chem. B, 126, 1758–1767 (2022).
A-118
I. Umegaki, et al.
Negative Muon Spin Rotation and Relaxation
Study on Battery Anode Material, Spinel
Li4Ti5O12
J. Phys. Chem. C, 126, 10506–10514 (2022).
A-119
T. Sato, et al.
Effect of Co-Substitution on Hydrogen
Absorption and Desorption Reactions ofYMgNi4-Based Alloys
J. Phys. Chem. C, 126, 16943–16951 (2022).
A-120
S. Hori, et al.
Revealing the Ion Dynamics in Li10GeP2S12
by Quasi-Elastic Neutron Scattering
Measurements
J. Phys. Chem. C, 126, 9518–9527 (2022).
A-121
M. Nakano, et al.
Energetic and Structural Insights into
Phospholipid Transfer from Membranes
with Different Curvatures by Time-Resolved
Neutron Scattering
J. Phys. Chem. Lett., 13, 6024–6030 (2022).

A-122
R. Akiyama, et al.
Direct Probe of the Ferromagnetic
Proximity Effect at the Interface of SnTe/Fe Heterostructure by Polarized Neutron
Reflectometry
J. Phys. Chem. Lett., 13, 8228–8235 (2022).
A-123
M. Aizawa, et al.
Protein Condensation at Nanopore
Entrances as Studied by Differential
Scanning Calorimetry and Small-Angle
Neutron Scattering
J. Phys. Chem. Lett., 13, 8684–8691 (2022).
A-124
S. Shimono, et al.
Structural Phase Transition in Cobalt
Oxyfluoride Co3Sb4O6F6 Observed by
High-Resolution Synchrotron and Neutron
Diffraction
J. Phys. Chem. Solids, 163, 110568 (2022).
A-125
T. Yamanaka, et al.
Enhancement of Electrical Conductivity
to Metallization of Mn3-xFexO4 Spinel andPostspinel with Elevating Pressure
J. Phys. Chem. Solids, 167, 110721 (2022).
A-126
C. Kim, et al.
Antiferromagnetic Kitaev Interaction in Jeff
= 1/2 Cobalt Honeycomb Materials Na3Co2
SbO6 and Na2Co2TeO6
J. Phys. Condens. Matter, 34, 045802 (2022).
A-127
K. Kataoka, et al.
Pyrochlore Oxide Hg2Os2O7 on Verge ofMetal–Insulator Boundary
J. Phys. Condens. Matter, 34, 135602 (2022).
A-128
T. Xie, et al.
Spin Fluctuations in the 112-Type Iron-Based
Superconductor Ca0.82La0.18Fe0.96Ni 0.04As2
J. Phys. Condens. Matter, 34, 474001 (2022).
A-129
K. Kakimoto, et al.
Magnetism of AlxFe2−xGeO5 with Andalusite
Structure
J. Phys. Soc. Jpn., 91, 054704 (2022).
A-130
K. Kakimoto, et al.
Sinusoidal Magnetic Structure of AndalusiteType Alx Fe2−xGeO5 with x = 0.09 and 0.1
J. Phys. Soc. Jpn., 91, 054707 (2022).
A-131
N. Metoki, et al.
Hyperfine Splitting and Nuclear Spin
Polarization in NdPd5Al2 and Nd3Pd20Ge6
J. Phys. Soc. Jpn., 91, 054710 (2022).

A-132
T. Matsumura, et al.
Cycloidal Magnetic Ordering inNoncentrosymmetric EuIrGe3
J. Phys. Soc. Jpn., 91, 073703 (2022).
A-133
D. Ueta, et al.
Anomalous Magnetic Moment Direction
under Magnetic Anisotropy Originated from
Crystalline Electric Field in van Der Waals
Compounds CeTe3 and CeTe2Se
J. Phys. Soc. Jpn., 91, 094706 (2022).
A-134
M. Soda, et al.
Magnetic Diffuse and Quasi-Elastic
Scatterings in Frustrated Magnet YBaCo4O7
J. Phys. Soc. Jpn., 91, 094707 (2022).
A-135
M. Nasu, et al.
Neutron Imaging of Generated Water inside
Polymer Electrolyte Fuel Cell Using NewlyDeveloped Gas Diffusion Layer with Gas
Flow Channels during Power Generation
J. Power Sources, 530, 231251 (2022).
A-136
K. Saito, et al.
Oxide-Ion and Proton Conductivity of theOrdered Perovskite BaY1/3Ga2/3O2.5
J. Solid State Chem., 306, 122733 (2022).
A-137
F. Abudinen, et al.
Combined analysis of Belle and Belle IIdata to determine the CKM angle φ 3 using
B+→D(K0S h+h-)h+ decays
Journal of High Energy Physics,02, 63 (2022)
A-138
S.X. Li, et al.
First measurement of the Λ+c → pη' decay
Journal of High Energy Physics,03, 90 (2022)
A-139
K. Inami, et al.
An improved search for the electric dipole
moment of the τ lepton
Journal of High Energy Physics,04, 110 (2022)
A-140
F. Abudinen, et al.
Search for charged lepton flavor violating
decays of Υ (1S)
Journal of High Energy Physics,05, 95 (2022)
A-141
S. Sasada, et al.
Strain Distribution Visualization of PunchedElectrical Steel Sheets Using Neutron BraggEdge Transmission Imaging
Jpn. J. Appl. Phys., 61, 046004 (2022).
A-142
K. Shimokita, et al.

J-PARC Annual Report 2022

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Neutron Reflectivity Study on the
Suppression of Interfacial Water
Accumulation between a Polypropylene
Thin Film and Si Substrate Using a SilaneCoupling Agent
Langmuir, 38, 12457–12465 (2022).
A-143
K. Yamaoka, et al.
Interfacial Selective Study on the Gelation
Behavior of Aqueous Methylcellulose
Solution via a Quartz Crystal Microbalance
Langmuir, 38, 4494–4502 (2022).
A-144
D. Ihara, et al.
Cononsolvency of Poly[2-(methacryloyloxy)
ethyl phosphorylcholine] in Ethanol–Water
Mixtures: A Neutron Reflectivity Study
Langmuir, 38, 5081–5088 (2022).
A-145
Y. Xie, et al.
Hydrophobicity of the Pentafluorosulfanyl
Group in Side Chains of Polymethacrylates
by Evaluation with Surface Free Energy and
Neutron Reflectivity
Langmuir, 38, 6472–6480 (2022).
A-146
Y. Higaki, et al.
Zwitterionic Poly(carboxybetaine) Brush/Albumin Conjugate Films: Structure andLubricity
Langmuir, 38, 9278–9284 (2022).
A-147
T. Tominaga, et al.
Data Collection for Dilute Protein Solutions
via a Neutron Backscattering Spectrometer
Life, 12, 675 (2022).
A-148
S. Imai, et al.
Water-Assisted Microphase Separation of
Cationic Random Copolymers into Sub-5 Nm
Lamellar Materials and Thin Films
Macromolecules, 55, 9113–9125 (2022).
A-149
M. Kumagai, et al.
In situ Neutron Diffraction Analysis of
Microstructural Evolution-Dependent StressResponse in Austenitic Stainless Steel under
Cyclic Plastic Deformation
Mater. Des., 221, 110965 (2022).
A-150
K. S. N. Sesha, et al.
Demonstrating a Duplex TRIP/TWIP Titanium
Alloy via the Introduction of Metastable
Retained β-Phase
Mater. Res. Lett., 10, 754–761 (2022).
A-151
H. Dannoshita, et al.
Evolution of Dislocation Structure

Determined by Neutron Diffraction Line
Profile Analysis during Tensile Deformationin Quenched and Tempered Martensitic
SteelsMater. Sci. Eng. A, 854, 143795 (2022).
A-152
P. Thirathipviwat, et al.
In-situ Neutron Diffraction Study on a
Dislocation Density in a Correlation with
Strain Hardening in Al–Mg Alloys
Mater. Sci. Eng. A, 855, 143956 (2022).
A-153
T.-N. Lam, et al.
Estimating Fine Melt Pool, Coarse Melt
Pool, and Heat Affected Zone Effects on
the Strengths of Additive Manufactured
AlSi10Mg Alloys
Mater. Sci. Eng. A, 856, 143961 (2022).
A-154
D. Egusa, et al.
Quantitative X-Ray Diffraction Analysis of
Solute-Enriched Stacking Faults in Hcp-Mg
Alloys Based on Peak Asymmetry Analysis
Mater. Today Commun., 31, 103344 (2022).
A-155
R. Miyazaki, et al.
Reverse Monte Carlo Analysis of NaI-LiI
Solid Electrolyte Based on the Neutron Total
Scattering Data
Mater. Today Commun., 32, 104014 (2022).
A-156
S. M. Suturin, et al.
Structural Peculiarities of ε-Fe2O3/GaN
Epitaxial Layers Unveiled by High-Resolution
Transmission Electron Microscopy and
Neutron Reflectometry
Mater. Today Commun., 33, 104412 (2022).
A-157
E. Rathore, et al.
Enhanced Covalency and NanostructuredPhonon Scattering Lead to High
Thermoelectric Performance in n-Type PbS
Mater. Today Energy, 24, 100953 (2022).
A-158
H. Sasaki, et al.
Characterization of Precipitated Phase in Cu–
Ni–Si Alloy by Small-Angle X-Ray Scattering,
Small Angle Neutron Scattering and Atom
Probe Tomography
Mater. Trans., 63, 1384–1389 (2022).
A-159
N. R. Jaladurgam, et al.
Load Redistribution in Eutectic High Entropy
Alloy AlCoCrFeNi2.1 during High Temperature
Deformation
Materialia, 22, 101392 (2022).
A-160
Y. Wang, et al.

Evolution of Austenite Lattice Parameter
during Isothermal Transformation in a 0.4 C
Low Alloyed SteelMaterialia, 27, 101685 (2022).
A-161
T. YamadaQuasi Elastic Neutron Scattering Study on
Water Dynamics in Nafion Membrane
MEMBRANE, 47, 207–212 (2022).
A-162
M.-M. Schiavone, et al.
On the Proton Conduction Pathways in
Polyelectrolyte Membranes Based on
Syndiotactic-Polystyrene
Membranes, 12, 143 (2022).
A-163
Y. Onuki, et al.
Microstructure Formation and Carbon
Partitioning with Austenite Decomposition
during Isothermal Heating Process in Fe-SiMn-C Steel Monitored by in situ Time-ofFlight Neutron Diffraction
Metals, 12, 957 (2022).
A-164
K. Yamanaka, et al.
Dislocation Density of Electron Beam Powder
Bed Fusion Ti–6Al–4V Alloys Determined
via Time-Of-Flight Neutron Diffraction LineProfile Analysis
Metals, 13, 86 (2022).
A-165
K. Shiomi
Search for Rare Kaon Decays at the J-PARC
KOTO Experiment
Moscow University Physics Bulletin,77, 254 (2022)
A-166
Q. Li, et al.
Ferroelectric Ordering in Nanosized PbTiO3
Nano Lett., 22, 9405–9410 (2022).
A-167
R. Takagi, et al.
Square and Rhombic Lattices of Magnetic
Skyrmions in a Centrosymmetric BinaryCompoundNat. Commun., 13, 1472 (2022).
A-168
P. Luo, et al.
Q-Dependent Collective Relaxation
Dynamics of Glass-Forming Liquid
Ca0.4K0.6(NO3)1.4 Investigated by Wide-Angle
Neutron Spin-EchoNat. Commun., 13, 2092 (2022).
A-169
Y. Yu, et al.
The ω3 Scaling of the Vibrational Density ofStates in Quasi-2D Nanoconfined SolidsNat. Commun., 13, 3649 (2022).

Publications

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86
A-170
L. Chen, et al.
Anisotropic Magnon Damping by ZeroTemperature Quantum Fluctuations in
Ferromagnetic CrGeTe3
Nat. Commun., 13, 4037 (2022).
A-171
S. Xu, et al.
Non-Hookean Large Elastic Deformation in
Bulk Crystalline Metals
Nat. Commun., 13, 5307 (2022).
A-172
F. Takeiri, et al.
Hydride-Ion-Conducting K2NiF4-Type Ba–Li
Oxyhydride Solid Electrolyte
Nat. Mater., 21, 325–330 (2022).
A-173
A. D. Hillier, et al.
Muon Spin Spectroscopy
Nat. Rev. Methods Primer, 2, 4 (2022).
A-174
J. Pacio, et al.
Advanced Thermal-Hydraulic experiments
and instrumentation for heavy liquid metal
reactors
Nucl. Eng. Des. 399, 112010 (2022)
A-175
A. Kobayashi, et al.
Impedance reduction by a SiC-loaded flange
and its application to the J-PARC main ring
septum magnet
Nucl. Instrum. Methods Phys. Res. A, 1031, 16651(2022)A-176
H. Okita, et al.
Improvement of longitudinal beam tracking
simulation considering the frequency
response of the cavity gap voltage monitor
Nucl. Instrum. Methods Phys. Res. A, 1041,
p.167361_1 - 167361_7 (2022)
A-177
V. Andrieux, et al.
The large COMPASS polarized solid ammonia
target for Drell-Yan measurements with apion beam
Nucl. Instrum. Methods Phys. Res. A1025, 166069(2022)
A-178
K. Abe, et al.
First gadolinium loading to SuperKamiokande
Nucl. Instrum. Methods Phys. Res. A1027, 166248(2022)A-179
Y. Akazawa, et al.
Development and application of CATCH: A
cylindrical active tracker and calorimetersystem for hyperon--proton scatteringexperiments
Nucl. Instrum. Methods Phys. Res. A1029, 166430(2022)A-180
N. Muramatsu, et al.
SPring-8 LEPS2 beamline: A facility to
produce a multi-GeV photon beam via laser
Compton scattering
Nucl. Instrum. Methods Phys. Res. A1033, 166677(2022)A-181
T. Ishikawa, et al.
Time resolution of a 1.8-m long BC-420
plastic scintillator bar with metal-packaged
H11934 photomultiplier tubes
Nucl. Instrum. Methods Phys. Res. A1039, 167164(2022)A-182
S. Nakasuga, et al.
Commissioning of the electron identification
system for Dilepton measurement in pA
collisions at J-PARC
Nucl. Instrum. Methods Phys. Res. A1041, 167335(2022)A-183
H. Nishiguchi, et al.
Vacuum-Compatible, Ultra-Thin-Wall Straw
Tracker; Detector construction, Thinner straw
R\&D, and the brand-new graphite-straw
development
Nucl. Instrum. Methods Phys. Res. A1042, 167373(2022)A-184
M. Fujita, et al.
Development of a Ge detector array and an
in-beam calibration system for highly precise
measurement of Ξ- atomic X-rays
Nucl. Instrum. Methods Phys. Res. A1042, 167439(2022)A-185
C. Zhang, et al.
Modeling the diffusion of muonium in silica
aerogel and its application to a novel designof multi-layer target for thermal muon
generation
Nucl. Instrum. Methods Phys. Res. A1042, 167443(2022)A-186
K. Horie, et al.
Measurement of Residual µ+ Polarization in
Various Scintillating Materials to Search for
T -Violating µ+ Polarization in K + → π 0µ+ ν
Decay
Nucl. Instrum. Methods Phys. Res. Sect. Accel.
Spectrometers Detect. Assoc. Equip., 1037,
166932 (2022).
A-187
K. Isegawa, et al.
Fast Phase Differentiation between Liquid–

Water and Ice by Pulsed Neutron Imaging
with Gated Image Intensifier
Nucl. Instrum. Methods Phys. Res. Sect. Accel.
Spectrometers Detect. Assoc. Equip., 1040 167260(2022).
A-188
F. Nemoto, et al.
Performance of Position-Sensitive Flat-Paneland Resister Type Photomultiplier Tube
Detector on Neutron Reflectometer SOFIA
at J-PARC
Nucl. Instrum. Methods Phys. Res. Sect. Accel.
Spectrometers Detect. Assoc. Equip., 1040,
166988 (2022).
A-189
H. Takeshita, et al.
Measurement of nuclide production crosssections for proton-induced reactions on
natNi and natZr at 0.4, 1.3, 2.2, and 3.0 GeV
Nucl. Instrum. Methods. Phys. Res. B 527, 17(2022)A-190
M. Kawano, et al.
Effects of Self-Hydrogen Bonding among
Formamide Molecules on the UCST-Type
Liquid–Liquid Phase Separation of Binary
Solutions with Imidazolium-Based Ionic
Liquid, [CnMim][TFSI], Studied by NMR, IR,
MD Simulations, and SANS
Phys. Chem. Chem. Phys., 24, 13698–13712(2022).
A-191
K. Yamaguchi, et al.
Kinetics of the Interfacial Curing Reaction for
an Epoxy–Amine Mixture
Phys. Chem. Chem. Phys., 24, 21578–21582(2022).
A-192
T. Yamanaka, et al.
Magnetic and Structure Transition of Mn3-x
FexO4 Solid Solutions under High-Pressureand High-Temperature Conditions
Phys. Chem. Miner., 49, 41 (2022).
A-193
B. Yee-Rendon, et al.
Beam dynamics studies for fast beam trip
recovery of the Japan Atomic Energy Agency
accelerator-driven subcritical system
Phys. Rev. Accel. Beams, 25, 080101 (2022)
A-194
Y. Nakazawa, et al.
High-power test of an interdigital H-mode
drift tube linac for the J-PARC muon g-2 andelectric dipole moment experimentPhys. Rev. Accel. Beams, 25, 110101 (2022)
A-195
Y. Nakazawa, et al.
High-power test of an interdigital H-mode
drift tube linac for the J-PARC

J-PARC Annual Report 2022

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87
Phys. Rev. Accel. Beams, 25, 110101(2022)
A-196
M-Y. Huang, et al.
Performance of the correlated painting
based on the mechanical structure of the
anticorrelated painting scheme
Phys. Rev. Accel. Beams, 25, 110401 (2022)
A-197
T. Yasui, et al.
Suppression of the eighth-order spacecharge-induced resonancePhys. Rev. Accel. Beams, 25, 121001 (2022)
A-198
M. Saito, et al.
Indirectly cooled secondary-particle
production target at J-PARC Hadron
Experimental Facility
Phys. Rev. Accel. Beams, 25, 63001 (2022)
A-199
H. Kadowaki, et al.
Spin and Quadrupole Correlations by ThreeSpin Interaction in the Frustrated Pyrochlore
Magnet Tb2+x Ti2−xO7+yPhys. Rev. B, 105, 014439 (2022).
A-200
K. Ikeuchi, et al.
Spin Excitations Coupled with Lattice andCharge Dynamics in La2−xSrxCuO4
Phys. Rev. B, 105, 014508 (2022).
A-201
M. Watanabe, et al.
Contrasting Magnetic Structures in
SrLaCuSbO6 and SrLaCuNbO6: Spin -1/2
Quasi-Square-Lattice J1−J2 Heisenberg
Antiferromagnets
Phys. Rev. B, 105, 054414 (2022).
A-202
M. Saito, et al.
Structures of Magnetic Excitations in theSpin -1/2 Kagome-Lattice Antiferromagnets
Cs2Cu3SnF12 and Rb2Cu3SnF12
Phys. Rev. B, 105, 064424 (2022).
A-203
K. Matan, et al.
Breakdown of Linear Spin-wave Theory andExistence of Spinon Bound States in the
Frustrated Kagome-Lattice Antiferromagnet
Phys. Rev. B, 105, 134403 (2022).
A-204
M. Fujihala, et al.
Relief of Spin Frustration through Magnetic
Anisotropy in the Quasi-One-Dimensional
S = 1/2 Antiferromagnet Na2CuSO4Cl2
Phys. Rev. B, 105, 144410 (2022).
A-205
Y. Kojima, et al.
Magnons and Spinons in Ba2CoTeO6: A

Composite System of Isolated Spin-1/2
Triangular Heisenberg-like and Frustrated
Honeycomb Ising-like Antiferromagnets
Phys. Rev. B, 105, L020408 (2022).
A-206
Y. Imai, et al.
Zigzag Magnetic Order in the Kitaev SpinLiquid Candidate Material RuBr3 with a
Honeycomb Lattice
Phys. Rev. B, 105, L041112 (2022).
A-207
S.-H. Do, et al.
Damped Dirac Magnon in the Metallic
Kagome Antiferromagnet FeSn
Phys. Rev. B, 105, L180403 (2022).

A-215
M. Hiraishi, et al.
Local Electronic Structure of Dilute
Hydrogen in β−Ga2O3 Probed by Muons
Phys. Rev. B, 107, L041201 (2022).
A-216
J. Koga, et al.
Angular Distribution of γ Rays from thep-Wave Resonance of 118Sn
Phys. Rev. C, 105, 054615 (2022).
A-217
U.A. Acharya, et al.
Kinematic dependence of azimuthal
anisotropies in p+Au, d+Au, and 3He +Au at√sNN = 200 GeV
Phys. Rev. C, 105, 24901 (2022)

A-208
M. Micoulaut, et al.
Structural Properties of Chalcogenide
Glasses and the Isocoordination Rule:
Disentangling Effects from Chemistry and
Network Topology
Phys. Rev. B, 106, 014206 (2022).

A-218
T. Ishikawa, et al.
Coherent photoproduction of the neutralpion and η-meson on the deuteron atincident energies below 1.15 GeV
Phys. Rev. C, 105, 45201 (2022)

A-209
K. Tomiyasu, et al.
Observation of Topological Z2 Vortex
Fluctuations in the Frustrated Heisenberg
Magnet NaCrO2
Phys. Rev. B, 106, 054407 (2022).

A-219
U.A. Acharya, et al.
Systematic study of nuclear effects in p+Al,
p+Au, p+Au, and 3He + Au collisions at√sNN = 200 GeV using π 0 production
Phys. Rev. C, 105, 64902 (2022)

A-210
R. Tripathi, et al.
Quantum Critical Spin-Liquid-like Behavior in
the S = 1/2 Quasikagome-Lattice Compound
CeRh1−xPdxSn Investigated Using Muon Spin
Relaxation and Neutron Scattering
Phys. Rev. B, 106, 064436 (2022).

A-220
U. Acharya, et al.
Measurement of ψ(2S) nuclear modification
at backward and forward rapidity in p+p,
p+Al, and p+Au collisions at √sNN = 200 GeV
Phys. Rev. C, 105, 64912 (2022)

A-211
B. Gao, et al.
Magnetic Field Effects in an Octupolar
Quantum Spin Liquid Candidate
Phys. Rev. B, 106, 094425 (2022).
A-212
Y. Ishii, et al.
Partial Breakdown of Translation Symmetry
at a Structural Quantum Critical Point
Associated with a Ferroelectric Soft Mode
Phys. Rev. B, 106, 134111 (2022).
A-213
T. Hattori, et al.
Hydrogen Vibration Excitations of ZrH1.8 andTiH1.84 up to 21 GPa by Incoherent Inelastic
Neutron Scattering
Phys. Rev. B, 106, 134309 (2022).
A-214
Z. Jin, et al.
Chern Numbers of Topological Phonon Band
Crossing Determined with Inelastic Neutron
Scattering
Phys. Rev. B, 106, 224304 (2022).

A-221
S. Endo, et al.
Measurement of the Transverse Asymmetryof γ Rays in the 117Sn(n, γ) 118Sn Reaction
Phys. Rev. C, 106, 064601 (2022).
A-222
U. Acharya, et al.
φ meson production in p+Al, p+Au, d+Au,
and 3He+Au collisions at √sNN = 200 GeV
Phys. Rev. C, 106, 14908 (2022)
A-223
T. Hashimoto, et al.
Differential cross sections and photon beam
asymmetries of η photoproduction on the
proton at E γ = 1.3-2.4 GeV
Phys. Rev. C, 106, 35201 (2022)
A-224
X.L. Wang, et al.
Study of γγ → γψ(2S) at Belle
Phys. Rev. D, 105, 112011 (2022)
A-225
E. Waheed, et al.
Study of B0 → D+h-(h=K/π) decays at BellePublications

J-PARC Annual Report 2022

88
Phys. Rev. D, 105, 12003 (2022)
A-226
B. Wang, et al.
Measurement of B(Bs → Ds X ) with Bs
semileptonic tagging
Phys. Rev. D, 105, 12004 (2022)
A-227
G.D. Alexeev, et al.
Exotic meson π1(1600) with JPC = 1- + and its
decay into ρ(770)πPhys. Rev. D, 105, 12005 (2022)
A-228
B. Bhuyan, et al.
Search for the decay B 0S → ηηPhys. Rev. D, 105, 12007 (2022)
A-229
Wren A. Yamada, et al.
Near-threshold spectrum from a uniformized
Mittag-Leffler expansion: Pole structure of
the Z(3900)
Phys. Rev. D, 105, 14034 (2022)
A-230
X.Y. Gao, et al.
Search for tetraquark states Xcc s s in D+s D+s(D*s +D*s +) final states at Belle
Phys. Rev. D, 105, 32002 (2022)
A-231
U.A. Acharya, et al.
Transverse-single-spin asymmetries ofcharged pions at midrapidity in transversely
polarized p+p collisions at √s = 200 GeV
Phys. Rev. D, 105, 32003 (2022)
A-232
U.A. Acharya, et al.
Transverse single spin asymmetries of
forward neutrons in p+p, p+Al, and p+Au
collisions at √sNN = 200 GeV as a function oftransverse and longitudinal momenta
Phys. Rev. D, 105, 32004 (2022)
A-233
R.U. Abbasi, et al.
Observation of variations in cosmic ray
single count rates during thunderstorms
and implications for large-scale electric fieldchanges
Phys. Rev. D, 105, 62002 (2022)
A-234
A. Abed Abud, et al.
Low exposure long-baseline neutrino
oscillation sensitivity of the DUNE
experimentPhys. Rev. D, 105, 72006 (2022)
A-235
T. Bloomfield, et al.
Measurement of the branching fraction and
CP asymmetry for $B → D 0π decays
Phys. Rev. D, 105, 72007 (2022)

A-236
Y. Li, et al.
Measurements of the branching fractionsof Ξ 0c → Λ K 0S , Ξ 0c → Σ0K 0S , and Ξ 0c → Σ+K decays at Belle
Phys. Rev. D, 105, L011102 (2022)
A-237
C. Hadjivasiliou, et al.
Search for B 0 meson decays into Λ andmissing energy with a hadronic tagging
method at Belle
Phys. Rev. D, 105, L051101 (2022)
A-238
Y.B. Li, et al.
First test of lepton flavor universality in thecharmed baryon decays Ω0c → Ω-ℓ+νℓ using
data of the Belle experimentPhys. Rev. D, 105, L091101 (2022)
A-239
M. Pavin, et al.
Measurement of proton-carbon forward
scattering in a proof-of-principle test of the
EMPHATIC spectrometer
Phys. Rev. D, 106, 112008 (2022)
A-240
T. Czank, et al.
Search for Z' → µ+ µ- in the Lµ - Lτ gaugesymmetric model at Belle
Phys. Rev. D, 106, 12003 (2022)
A-241
H.B. Jeon, et al.
Search for the radiative penguin decays
B 0 → K S0 K S0 γ in the Belle experimentPhys. Rev. D, 106, 12006 (2022)
A-242
U. Gebauer, et al.
Measurement of the branching fractions of
the B+→ ηℓ+νℓ and B+→ η'ℓ+νℓ decays withsignal-side only reconstruction in the full q2
range
Phys. Rev. D, 106, 32013 (2022)
A-243
E. Gramellini, et al.
Measurement of the π --Ar total hadronic
cross section at the LArIAT experimentPhys. Rev. D, 106, 52009 (2022)
A-244
R. Matsumoto, et al.
Search for proton decay via p → µ+ K 0 in
0.37 megaton-years exposure of SuperKamiokande
Phys. Rev. D, 106, 72003 (2022)
A-245
Y. Hidaka, et al.
Complementarity and causal propagation of
decoherence by measurement in relativistic
quantum field theories
Phys. Rev. D, 106, 76018 (2022)

A-246
M. Bogomilov, et al.
Multiple Coulomb scattering of muons inlithium hydride
Phys. Rev. D, 106, 92003 (2022)
A-247
T. Pang, et al.
Search for the decay B 0S → η' K 0S
Phys. Rev. D, 106, L051103 (2022)
A-248
S.-M. Chang, et al.
Mechanism of Endosomal Escape by pH-Responsive Nucleic-Acid Vectors
Phys. Rev. E, 106, 034408 (2022).
A-249
T. Hashimoto, et al.
Measurements of Strong-Interaction Effects
in Kaonic-Helium Isotopes at Sub-eV
Precision with X-Ray Microcalorimeters
Phys. Rev. Lett., 128, 112503 (2022)
A-250
Y.C. Chen, et al.
Measurement of Two-Particle Correlations ofHadrons in e+e- Collisions at Belle
Phys. Rev. Lett., 128, 142005 (2022)
A-251
K. Miwa, et al.
Precise Measurement of Differential Cross
Sections of the Σ- p → Λn Reaction in
Momentum Range 470 – 650 MeV/c
Phys. Rev. Lett., 128, 72501 (2022)
A-252
S .Jia, et al.
Search for a Light Higgs Boson in SinglePhoton Decays of Υ (1S) Using Υ(2S) → π + π Υ (1S) Tagging Method
Phys. Rev. Lett., 128, 81804 (2022)
A-253
W. Yao, et al.
Excitations in the Ordered and Paramagnetic
States of Honeycomb Magnet Na2Co2TeO6
Phys. Rev. Lett., 129, 147202 (2022).
A-254
Wren A. Yamada, et al.
Analytic Map of Three-Channel S Matrix:
Generalized Uniformization and MittagLeffler Expansion
Phys. Rev. Lett., 129, 192001 (2022)
A-255
M. Fujihala, et al.
Birchite Cd2Cu2(PO4)2SO4 · 5H2O as a Model
Antiferromagnetic Spin-1/2 Heisenberg J1−J2
Chain
Phys. Rev. Mater., 6, 114408 (2022).
A-256
S. Shamoto, et al.
Magnetic Bragg Peak Enhancement underJ-PARC Annual Report 2022

Publications

89
Ultrasound Injection
Phys. Rev. Res., 4 ,013245 (2022).
A-257
Y. Ohmasa, et al.
Rotation of Complex Ions with Ninefold
Hydrogen Coordination Studied by
Quasielastic Neutron Scattering and FirstPrinciples Molecular Dynamics Calculations
Phys. Rev. Res., 4 ,033215 (2022).
A-258
M. Matsuura, et al.
Phonon Renormalization Effects
Accompanying the 6 K Anomaly in the
Quantum Spin Liquid Candidate κ−(BEDTTTF)2Cu2(CN)3
Phys. Rev. Res., 4, L042047 (2022).
A-259
S. Bao, et al.
Neutron Spectroscopy Evidence on the Dual
Nature of Magnetic Excitations in a van Der
Waals Metallic Ferromagnet Fe2.72GeTe2
Phys. Rev. X, 12, 011022 (2022).
A-260
X. Li, et al.
Giant Magnetic In-Plane Anisotropy andCompeting Instabilities in Na3Co2SbO6
Phys. Rev. X, 12, 041024 (2022).
A-261
H. Ito, et al.
Measurement of structure dependent
radiative K + → e+νγ decays using stopped
positive kaonsPhysics Letters B, 835, 136913 (2022)
A-262
Y. Fujimoto, et al.
Equation of state of neutron star matterand its warm extension with an interacting
hadron resonance gas
Physics Letters B, 835, 137524 (2022)
A-263
H. Aoyama, et al.
Cryptoasset networks: Flows and regular
players in Bitcoin and XRP
PLoS ONE17, e0273068 (2022)
A-264
M. Yoshida, et al.
Conformation and Structure of Hydroxyethyl
Cellulose Ether with a Wide Range of
Average Molar Masses in Aqueous Solutions
Polymers, 14, 4532 (2022).
A-265
A. Koda, et al.
Organic Molecular Dynamics and Chargecarrier Lifetime in Lead Iodide Perovskite
MAPbI3
Proc. Natl. Acad. Sci., 119, e2115812119 (2022).

A-266
K. Yamashita, et al.
Atomic Distribution and Local Structure inIce VII from in situ Neutron Diffraction
Proc. Natl. Acad. Sci., 119, e2208717119 (2022).
A-267
W. Higemoto, et al.
Direct Measurement of the Evolution ofMagnetism and Superconductivity toward
the Quantum Critical Point
Proc. Natl. Acad. Sci., 119, e2209549119 (2022).
A-268
J. Sheng, et al.
Two-Dimensional Quantum Universality in
the Spin-1/2 Triangular-Lattice Quantum
Antiferromagnet Na2BaCo(PO4)2
Proc. Natl. Acad. Sci., 119, e2211193119 (2022).
A-269
Y. Hidaka, et al.
Foundations and applications of quantum
kinetic theory
Progress in Particle and Nuclear Physics, 127,
103989 (2022)
A-270
Y. Shobuda
Two-dimensional resistive-wall impedancewith finite thickness; Its mathematicalstructures and their physical meanings
PTEP (Internet),2022(5), p.053G01_1 053G01_44, (2022)
A-271
M. Chimura, et al.
Beam emittance growth due to the strong
space-charge field at low energy of a highintensity ion linac and its mitigation using anoctupole magnetic field
PTEP (Internet),2022(6), p.063G01_1 063G01_26, (2022)

anomalous magnetic moment and electric
dipole moment
PTEP 2022, 052C01 (2022)
A-276
T. Hayata, et al.
Lattice Lindblad simulation
PTEP 2022, 053B03 (2022)
A-277
R.L. Workman, et al.
REVIEW OF PARTICLE PHYSICSPTEP 2022, 083C01 (2022)
A-278
T. Nanamura, et al.
Measurement of differential cross sectionsfor Σ+p elastic scattering in the momentum
range 0.44--0.80 GeV/c
PTEP 2022, 093D01 (2022)
A-279
M. Fujita, et al.
Ξ- atomic X-ray spectroscopy using acounter-emulsion hybrid method
PTEP 2022, 123D01 (2022)
A-280
M. Nishida, et al.
Neutron Stress Measurement of W/Ti
Composite in Cryogenic Temperatures Using
Time-of-Flight Method
Quantum Beam Sci., 7, 8 (2022).
A-281
E. Wakai, et al.
Development of Innovative Materials andMeasurement Systems used for Radiation
Environment
Research & Development in Material Science, 16,1859 (2022)

A-272
T. Yasui, et al.
Beam optics for the compensation of thirdorder structure resonances
PTEP 2022, 013G01 (2022)

A-282
E. Wakai, et al.
Titanium/Titanium Oxide Particle Dispersed
W-TiC Composites for High Irradiation
Applications
Research & Development in Material Science, 16,
1879 (2022)

A-273
Y. Hidaka, et al.
Symmetry protected topological phases ofmatter
PTEP 2022, 04A001 (2022)

A-283
T. Fujiwara, et al.
Neutron Flat-Panel Detector Using In–Ga–
Zn–O Thin-Film Transistor
Rev. Sci. Instrum., 93, 013304 (2022).

A-274
Y. Hidaka, et al.
Global 4-group symmetry and 't
Hooft anomalies in topological axion
electrodynamics
PTEP 2022, 04A103 (2022)

A-284
J. Abe, et al.
Development of Triaxial Compressive
Apparatus for Neutron Experiments with
Rocks
Rev. Sci. Instrum., 93, 025103 (2022).

A-275
M. OtaniFirst muon acceleration and muon linear
accelerator for measuring the muon

A-285
K. Akutsu-Suyama, et al.
Heavy Water Recycling for Producing
Deuterium Compounds

Publications

J-PARC Annual Report 2022

90
RSC Adv., 12, 24821–24829 (2022).
A-286
N. Okita, et al.
The Origin of Stability and High Co2+/3+
Redox Utilization for FePO4-Coated
LiCo0.90Ti0.05PO4/MWCNT Nanocomposites
for 5 V Class Lithium Ion Batteries
RSC Adv., 12, 26192–26200 (2022).
A-287
Y. Hanazono, et al.
Revisiting the Concept of Peptide Bond
Planarity in an Iron-Sulfur Protein by Neutron
Structure Analysis
Sci. Adv., 8, eabn2276 (2022).
A-288
Y. Qin, et al.
Field-Tuned Quantum Effects in a TriangularLattice Ising Magnet
Sci. Bull., 67, 38–44 (2022).
A-289
K. Iida, et al.
Magnon Mode Transition in Real Space
Sci. Rep., 12, 20663 (2022).
A-290
E. Nocerino, et al.
Nuclear and Magnetic Spin Structure of
the Antiferromagnetic Triangular LatticeCompound LiCrTe2 Investigated by µ+ SR,
Neutron and X-Ray Diffraction
Sci. Rep., 12, 21657 (2022).
A-291
H. Hashimoto, et al.
Structure of Alumina Glass
Sci. Rep., 12, 516 (2022).
A-292
I.-H. Chiu, et al.
Non-Destructive 3D Imaging Method Using
Muonic X-Rays and a CdTe Double-Sided
Strip Detector
Sci. Rep., 12, 5261 (2022).

A-293
M. Maeda, et al.
Effect of Sample Density in Prompt γ-Ray
AnalysisSci. Rep., 12, 6287 (2022).
A-294
H. Kwon, et al.
Work Hardening Behavior of Hot-Rolled
Metastable Fe50Co25Ni10Al5Ti5Mo5 MediumEntropy Alloy: in situ Neutron Diffraction
AnalysisSci. Technol. Adv. Mater., 23, 579–586 (2022).
A-295
T. Nakamura, et al.
Formation and Evolution of Carbonaceous
Asteroid Ryugu: Direct Evidence fromReturned Samples
Science, 379, eabn8671 (2022).
A-296
M.-Y. Luo, et al.
Grain-Size-Dependent Microstructure Effects
on Cyclic Deformation Mechanisms in
CoCrFeMnNi High-Entropy-Alloys
Scr. Mater., 210, 114459 (2022).
A-297
D. Wei, et al.
Regulation of Strength and Ductility ofSingle-Phase Twinning-Induced Plasticity
High-Entropy Alloys
Scr. Mater., 216, 114738 (2022).

A-300
E. Zhao, et al.
Quantifying the Anomalous Local andNanostructure Evolutions Induced by Lattice
Oxygen Redox in Lithium‐Rich Cathodes
Small Methods, 6, 2200740 (2022).
A-301
F. Nemoto, et al.
Neutron Reflectometry-Based in situ
Structural Analysis of an Aligning Agent
Additive for the Alignment of Nematic Liquid
Crystals on Solid Substrates
Soft Matter, 18, 545–553 (2022).
A-302
F. Song, et al.
Tracer Diffusion Coefficients Measurements
on LaPO4-Dispersed LATP by Means of
Neutron Radiography
Solid State Ion., 377, 115873 (2022).
A-303
Y. Makida, et al.
SMES Model Device Cooled by Liquid
Hydrogen Flow through Thermosiphon Loop
TeionKogaku (低温工学), Vol 57, 241 (2022)
A-304
W. Shen, et al.
Relationship between Interfacial Adsorptionof Additive Molecules and Reduction ofFriction Coefficient in the Organic Friction
Modifiers-ZDDP Combinations
Tribol. Int., 167, 107365 (2022).

A-298
N. Tsuchida, et al.
Stress Partitioning between Bcc andCementite Phases Discussed from Phase
Stress and Dislocation Density in Martensite
SteelsScr. Mater., 222, 115002 (2022).

A-305
N. Yamashita, et al.
Interfacial Structure and Tribological
Property of Adsorbed Layer Formed by
Dibasic Acid Ester Derivative
Tribol. Online, 17, 246–256 (2022).

A-299
W. Gong, et al.
Compressive Deformation Behavior of AZ31
Alloy at 21K: An in-situ Neutron Diffraction
Study
Scr. Mater., 225, 115161 (2022).

A-306
S. Makimura
Frontiers of Target, Beam Window, and Its
Materials in the Proton Accelerator Field
Vacuum and Surface Science (表面と真空) 65, 577(2022)

Conference Reports and Books
B-001
M. Segawa, et al.
Investigation of Radioactive Samples for
Neutron Capture Reaction Measurements
Using Energy-Resolved Neutron Imaging
Ann. Nucl. Energy, 167, 108828 (2022).
B-002
S. Kanda
A Search for Atomic Parity Violation in
Muonic Atoms Using a High-Intensity Pulsed
Muon Beam at J-PARC
EPJ Web Conf., 262, 01010 (2022).

B-003
S. Fukumura, et al.
Proposal for New Measurements of Muonic
Helium Hyperfine Structure at J-PARC
EPJ Web Conf., 262, 01012 (2022).

B-005
Y. Kawakita, et al.
Recent Progress on DNA ToF Backscattering
Spectrometer in MLF, J-PARC
EPJ Web Conf., 272, 02002 (2022).

B-004
T. Higuchi, et al.
Prospects for a Neutron EDM Measurementwith an Advanced Ultracold Neutron Source
at TRIUMF
EPJ Web Conf., 262, 01015 (2022).

B-006
R. Kajimoto, et al.
Possible Future Upgrades of the DirectGeometry Chopper Spectrometer 4SEASONSEPJ Web Conf., 272, 02007 (2022).

J-PARC Annual Report 2022

Publications

91
B-007
K. Nakajima, et al.
Possible Options for Efficient Wide-Band
Polychromatic Measurements Using
Chopper Spectrometers at Pulsed Sources
EPJ Web Conf., 272, 02012 (2022).

B-016
T.D. Vu, et al.
Narrow-area Bragg-edge transmission of ironsamples using superconducting neutron
sensorJ. Phys. Conf. Ser., 2374, 12028 (2022)

B-008
S. Yoshida, et al.
Grain Orientation Dependence ofDeformation Microstructure Evolution andMechanical Properties in Face-Centered
Cubic High/Medium Entropy Alloys
IOP Conf. Ser. Mater. Sci. Eng., 1249, 012027(2022).

B-017
H. Shishido, et al.
Neutron Imaging toward Epithermal Regime
using a Delay Line Current-Biased KineticInductance Detector
J. Phys. Conf. Ser., 2374, 12029 (2022)

B-009
S. Sato, et al.
Development of a Pulse-WidthDiscriminating 3He Position-Sensitive
Detector System
J. Neutron Res., 24, 427–434 (2022).
B-010
A. Ueno, et al.
Impurities reduction conditionings torecover best beam quality of J-PARC cesiatedRF-driven H- ion source with new parts
exposed to plasma
J. Phys. Conf. Ser., 2244, 012029_1 - 012029_5(2022)B-011
Y. Yamada, et al.
Non-destructive beam spatial profile
measurement using a gas sheet monitor fora high-intensity ion beam
J. Phys. Conf. Ser., 2244, 012077_1 - 012077_6(2022)
B-012
T. Shibata, et al.
Numerical study of different electron density
observed in Hydrogen and Deuterium ion
source plasmas
J. Phys. Conf. Ser., 2244, 12002 (2022)
B-013
T. Shibata, et al.
Soundness evaluation of J-PARC RF ion
source after 5-month continuous operation
J. Phys. Conf. Ser., 2244, 12041 (2022)
B-014
T. D. Vu, et al.
Narrow-Area Bragg-Edge Transmissionof Iron Samples Using Superconducting
Neutron Sensor
J. Phys. Conf. Ser., 2323, 012028 (2022).
B-015
H. Shishido, et al.
Neutron Imaging toward Epithermal Regime
Using a Delay Line Current-Biased KineticInductance Detector
J. Phys. Conf. Ser., 2323, 012029 (2022).

B-018
T. Kosaka, et al.
Development of Low Temperature Analog
Readout (LTARS 2018) for LAr-TPCs
J. Phys. Conf. Ser., 2374, 12077 (2022)
B-019
T Arihara, et al.
Development of the in-situ Calibration
System using LEDs and Light Guide Plates for
the SuperFGD
J. Phys. Conf. Ser., 2374, 12118 (2022)
B-020
P.K, Saha, et al.
Recent results of beam loss mitigationand extremely low beam loss operation of
J-PARC RCS
J. Phys. Conf. Ser., 2420, 012040, 2023
B-021
M. Kitaguchi
T-violation in neutron scattering
JPS Conf. Proc., 37, 011010 (2022).
B-022
H. Akatsuka, et al.
Study of Thin Iron Films for Polarization
Analysis of Ultracold Neutrons
JPS Conf. Proc., 37, 020801 (2022).
B-023
T. Ino, et al.
Optically Polarized Alkali Metal Cell for
Muonic Helium Measurements
JPS Conf. Proc., 37, 021208 (2022).
B-024
R. Matsumiya, et al.
The Precision nEDM Measurement with
UltraCold Neutrons at TRIUMF
JPS Conf. Proc., 37, 20701(2022)
B-025
T. Ishikawa, et al.
Coherent neutral-pion and eta-meson
photoproduction on the deuteron
JPS Conf. Proc., 37, 21003 (2022)
B-026
F. Suekane, et al.
A Plan for Decay at Rest νe + Pb Cross Section
Measurement: DaRveX

PoSNuFACT2021, 402, 194 (2022).
B-027
S. Kanda
Toward a High-Precision Measurement of theMuon Lifetime with an Intense Pulsed Muon
Beam at J-PARC
PoSNuFACT2021, 402, 215 (2022).
B-028
G. Ariyoshi, et al.
Flow measurement in high temperatureliquid metal by using electro-magnet probe
Proc. 19th International Topical Meeting on
Nuclear Reactor Thermal Hydraulics (NURETH-19,
2022)
B-029
H. Obayashi, et al.
Application of Noncontact Type of UltrasonicFlowmeter for High Temperature LBE Flow
Proc. 19th International Topical Meeting on
Nuclear Reactor Thermal Hydraulics (NURETH-19,
2022)
B-030
B. Yee-Rendon, et al.
Progress on SRF Linac Development for the
Accelerator-Driven Subcritical System at
JAEA
Proc. 20th International Conference on RF
Superconductivity (SRF’21), pp. 372-375 (2022)
B-031
J. Tamura, et al.
Present Status of the Spoke Cavity
Prototyping for the JAEA-ADS Linac
Proc. 20th International Conference on RF
Superconductivity (SRF’21), pp. 612-615 (2022)
B-032
P.K. Saha, et al.
ACHIEVEMENT OF LOW BEAM LOSS AT HIGHINTENSITY OPERATION OF J-PARC 3 GeV RCS
Proc. Ann. Mtg PASJ, 1 (2022)
B-033
S. Mizobata, et al.
OVERVIEW OF THE J-PARC LINAC KLYSTRONTEST STAND
Proc. Ann. Mtg PASJ, 1041 (2022)
B-034
T. YASUI, et al.
RESULTS OF HIGH REPETITION BEAM
COMMISSIONING IN J-PARC MR
Proc. Ann. Mtg PASJ, 151 (2022)
B-035
T. Asami, et al.
HIGH-PRECISION OPTICS MEASUREMENTUSING COD RESPONSE IN J-PARC MAIN RING
Proc. Ann. Mtg PASJ, 161 (2022)
B-036
S. Iwata, et al.
COUNTERMEASURES FOR THE FAILURE

Publications

J-PARC Annual Report 2022

92
OF THE NEW SEPTUM MAGNET FOR FASTEXTRACTION IN J-PARC MAIN RING
Proc. Ann. Mtg PASJ, 170 (2022)
B-037
F. Tamura, et al.
EFFECTS OF THE LONGITUDINALIMPEDANCES ON NON-ADIABATIC BUNCH
MANIPULATION AT FLATTOP OF J-PARC MR
Proc. Ann. Mtg PASJ, 175 (2022)
B-038
A. KOBAYASHI, et al.
PROGRESS OF EVALUATION OF BEAM
COUPLING IMPEDANCE REDUCTION FOR
THE EDDY-CURRENT TYPE SEPTUM MAGNETIN J-PARC MR
Proc. Ann. Mtg PASJ, 19 (2022)
B-039
T. Ito, et al.
CAVITY CLEANING FOR SUPPRESSION OF
MULTIPACTOR OCCURED AT J-PARC SDTL
Proc. Ann. Mtg PASJ, 193 (2022)
B-040
Y. Nakazawa, et al.
HIGH-POWER TEST OF AN APF IH-DTL
PROTOTYPE FOR THE MUON LINAC
Proc. Ann. Mtg PASJ, 197 (2022)
B-041
K. Sumi, et al.
DESIGN OF COUPLER CELLS IN THE DISKLOADED STRUCTURE FOR THE MUON LINAC
Proc. Ann. Mtg PASJ, 202 (2022)
B-042
R. Kitamura, et al.
LONGITUDINAL MEASUREMENT OF HIGHINTENSITY BEAM WITH BUNCH-SHAPEMONITOR IN FRONT-END
Proc. Ann. Mtg PASJ, 212 (2022)
B-043
M. Nomura, et al.
IMAGE RECOGNITION TECHNOLOGY IS USEDTO OBTAIN MOMENTUM DISTRIBUTION
AND LONGITUDINAL BEAM SHAPE FROMMOUNTAIN PLOT IMAGE
Proc. Ann. Mtg PASJ, 215 (2022)
B-044
H. Iinuma, et al.
DEMONSTRATION OF THREE-DIMENSIONALSPIRAL INJECTION FOR J-PARC MUON g-2/
EDM EXPERIMEN
Proc. Ann. Mtg PASJ, 218 (2022)
B-045
Y. Fukao, et al.
DEVELOPMENT OF THE SIC MUON BEAM
MONITOR FOR THE COMET EXPERIMENT
Proc. Ann. Mtg PASJ, 224 (2022)
B-046
M. Chimura, et al.

Development of quadrupole-octupole
combined magnet for emittance-growth
mitigation in the J-PARC Linac
Proc. Ann. Mtg PASJ, 237 - 241 (2022)
B-047
T. Sugimoto, et al.
PERFORMANCE OF NEW IMPEDANCEMATCHING CIRCUIT FOR J-PARC MR
INJECTION KICKER MAGNET
Proc. Ann. Mtg PASJ, 247 (2022)
B-048
T. Shibata, et al.
THE REDUCTION OF THE LEAKAGE FIELD
OF THE NEW SEPTUM MAGNETS FOR FASTEXTRACTION IN J-PARC-MR
Proc. Ann. Mtg PASJ, 253 (2022)
B-049
H. Okita, et al.
EVALUATION OF HIGHER HARMONICS
GENERATED IN ACCELERATION GAPSDURING THE HIGH POWER BEAM
ACCELERATION AT J-PARC RCS
Proc. Ann. Mtg PASJ, 262 (2022)
B-050
P.K. Saha, et al.
STATUS OF POP DEMONSTRATION OF 400
MeV H- LASER STRIPPING AT J-PARC RCS
Proc. Ann. Mtg PASJ, 272 (2022)
B-051
S. Yamada
PROPOSAL FOR A UNIDIRECTIONALGATEWAY FROM EPICS CHANNEL ACCESS TO
HTTP USING WEB TECHNOLOGIES
Proc. Ann. Mtg PASJ, 296 (2022)
B-052
H. Takahashi, et al.
DEVELOPMENT OF BEAM WINDOWPROTECTION UNIT FOR J-PARC LINAC
Proc. Ann. Mtg PASJ, 300 (2022)
B-053
K. Agari, et al.
DEVELOPMENT OF TEMPERATUREMEASUREMENT AND CONTROL SYSTEMFOR NEW PRODUCTION TARGET AT J-PARC
HADRON EXPERIMENTAL FACILITY
Proc. Ann. Mtg PASJ, 309 (2022)
B-054
A. Toyoda, et al.
DEVELOPMENT OF HIGH SENSITIVITYRESIDUAL GAS IONIZATION PROFILEMONITOR FOR J-PARC HADRON HIGH-P
BEAMLINE(3)Proc. Ann. Mtg PASJ, 327 (2022)
B-055
R. Kitamura, et al.
STUDIES OF BEAM DIAGNOSTICS WITH
BUNCH-SHAPE MONITOR FOR HIGH-POWER
AND LOW-BETA H- BEAM

Proc. Ann. Mtg PASJ, 330 (2022)
B-056
Y. Sato, et al.
SIGNAL RESPONSE OF THE RESIDUAL GASIONIZATION CURRENT MONITOR IN J-PARC
HADRON EXPERIMENTAL FACILITY
Proc. Ann. Mtg PASJ, 338 (2022)
B-057
H. Iinuma, et al.
DESIGN WORK OF PULSED RADIAL KICKFIELD FOR J-PARC MUON g-2/EDM
EXPERIMENT
Proc. Ann. Mtg PASJ, 385 (2022)
B-058
K. Miura, et al.
UPGRADE OF MAIN MAGNET POWER SUPPLYSYSTEM IN J-PARC MR FOR HIGH-REPETITIONRATE OPERATION
Proc. Ann. Mtg PASJ, 400 (2022)
B-059
H. Watanabe, et al.
DESIGN OF GAS BEARING FOR ROTATINGDISK-TYPE SECONDARY-PARTICLEPRODUCTION TARGET AT J-PARC HADRONEXPERIMENTAL FACILITY
Proc. Ann. Mtg PASJ, 427 (2022)
B-060
S. Nagayama, et al.
Study of non-destructive slow beam
extraction method in particle accelerator
Proc. Ann. Mtg PASJ, 503 - 507(2022)
B-061
R. Kurasaki, et al.
DEVELOPMENT OF A LARGE-DIAMETERPILLOW-SEAL USING WELDED STAINLESSSTEEL PLATES (2)Proc. Ann. Mtg PASJ, 521 (2022)
B-062
T. Sasaki, et al.
DEVELOPMENT OF A WIDE DYNAMIC-RANGEBEAM PROFILE MONITOR USING OTR AND
FLUORESCENCE FOR INJECTED BEAMS IN
J-PARC MAIN RING (3)Proc. Ann. Mtg PASJ, 560 (2022)
B-063
M. Abe, et al.
TWO-DIMENSIONAL MAGNETIC FIELD
RECONSTRUCTION FOR SIMULATION OF
SPIRAL INJECTION IN MUON G-2/EDM
PRECISION MEASUREMENTS MAGNET
Proc. Ann. Mtg PASJ, 605 (2022)
B-064
F. Muto, et al.
DEVELOPMENT OF RADIATION-RESISTANTDISPLACEMENT SENSOR FOR MONITORINGROTATING PRODUCTION TARGET AT J-PARC
HADRON FACILITY
Proc. Ann. Mtg PASJ, 634 (2022)

J-PARC Annual Report 2022

Publications

93
B-065
H. Watanabe, et al.
EVALUATION OF PURE TUNGSTEN MADE
WITH METAL 3D PRINTER
Proc. Ann. Mtg PASJ, 65 (2022)

B-075
R. Muto, et al.
SIMULATION STUDY ON THE BEAM SPILLSTRUCTURE OF THE SLOW EXTRACTION AT
J-PARC MAIN RING
Proc. Ann. Mtg PASJ, 893 (2022)

B-086
R. Kitamura, et al.
Studies of beam diagnostics with bunchshape monitor for high-power and low-beta
H- beam
Proc. Ann. Mtg. PASJ (internet), 330-332 (2022)

B-066
K. Shinto, et al.
OUTGASSING CHARACTERISTICS FROM THE
J-PARC-MADE INTERNAL ANTENNA FOR A
HIGH-INTENSITY RADIO-FREQUENCY H- ION
SOURCE
Proc. Ann. Mtg PASJ, 675 (2022)

B-076
S. Iwata, et al.
THE INSTALLATION OF THE NEW SEPTUM
MAGNETS FOR FAST EXTRACTION IN J-PARC
MAIN RING
Proc. Ann. Mtg PASJ, 901 (2022)

B-087
K. Nii, et al.
REPORTS OF ELECTRO-POLISHING
IMPLEMENTATION FOR QUARTER-WAVERESONATORS (2)Proc. Ann. Mtg. PASJ (internet), 601-604 (2022)

B-067
M. Tomizawa, et al.
DEVELOPMENT OF BEAM OPTICS
CORRECTION TOOL FOR J-PARC MAIN RING
Proc. Ann. Mtg PASJ, 711 (2022)

B-077
Y. Sugiyama, et al.
NEXT GENERATION LLRF CONTROL SYSTEMFOR J-PARC MR
Proc. Ann. Mtg PASJ, 92 (2022)

B-088
K. Shinto, et al.
Outgassing Characteristics from the J-PARCmade internal antenna for a high-intensity
radio-frequency H- ion source
Proc. Ann. Mtg. PASJ (internet), 675-679 (2022)

B-068
F. Kobayashi, et al.
COUNTERMEASURES AGAINST NOISE OF
INVERTER-CONTROLLED MULTI-STAGE ROOTPUMPS IN J-PARC LINAC BEAM DUMP
Proc. Ann. Mtg PASJ, 726 (2022)

B-078
Y. Hashimoto, et al.
A MULTI-RIBBON BEAM PROFILE MONITOR IN
A BEAM DUMP LINE OF J-PARC MR
Proc. Ann. Mtg PASJ, 931 (2022)

B-069
K. Satou, et al.
DEVELOPMENT OF SIGNAL ATTENUATOR
WITH LOW REFLECTION AND LOWDISTORTION FOR NEW BPM SIGNALACQUISITION SYSTEM OF J-PARC MR
Proc. Ann. Mtg PASJ, 751 (2022)
B-070
M. Shirakata, et al.
BEAM COLLIMATOR SYSTEM WHICH CONSISTSOF SEVEN UNITS IN J-PARC MAIN RING
Proc. Ann. Mtg PASJ, 756 (2022)
B-071
S. Makimura, et al.
DEVELOPMENT OF BEAM WINDOWWITH A LARGE DIAMETER, A THIN WALL
THICKNESS, AND A LARGE PROOF PRESSUREOUT OF Ti-6Al-4V THROUGH ADDITIVEMANUFACTURING
Proc. Ann. Mtg PASJ, 79 (2022)

B-079
N. Yoshimura, et al.
EVALUATION FOR UPDATING THE INTRABUNCH FEEDBACK AT J-PARC MAIN RING
Proc. Ann. Mtg PASJ, 936 (2022)
B-080
Ersin CICEK, et al.
INSTALLATION AND TEST OF THE PHASEDRIFT MONITOR AT J-PARC LINAC
Proc. Ann. Mtg PASJ, 97 (2022)
B-081
T. Ito, et al.
Cavity cleaning for suppression ofmultipactor occurred at the J-PARC SDTL
Proc. Ann. Mtg. PASJ (internet), 193-196(2022)
B-082
Y. Nakazawa, et al.
HIGH-POWER TEST OF AN APF IH-DTL
PROTOTYPE FOR THE MUON LINAC
Proc. Ann. Mtg. PASJ (internet), 197-201 (2022)

B-072
Y. Kawabata, et al.
VERIFICATION OF ROBOT UTILIZATION IN
ACCELERATOR TUNNEL
Proc. Ann. Mtg PASJ, 83 (2022)

B-083
Y. Sumi, et al.
DESIGN OF COUPLER CELLS IN THE DISKLOADED STRUCTURE FOR THE MUON LINAC
Proc. Ann. Mtg. PASJ (internet), 202-206 (2022)

B-073
T. Shibata, et al.
Evaluation of RF antenna lifetime after longterm operation of J-PARC ion source
Proc. Ann. Mtg PASJ, 863 (2022)

B-084
R. Kitamura, et al.
Longitudinal measurement of high-intensity
beam with bunch-shape monitor in front-end
Proc. Ann. Mtg. PASJ (internet), 212-214 (2022)

B-074
K. Okabe, et al.
BEAM SUTUDY ON MEBT1 AT THE J-PARC
LINEAC
Proc. Ann. Mtg PASJ, 885 (2022)

B-085
T. Takayanagi, et al.
Semiconductor pulse power supplies foraccelerators at J-PARC
Proc. Ann. Mtg. PASJ (internet), 242-246 (2022)

B-089
F. Kobatashi, et al.
Countermeasures against noise of invertercontrolled multi-stage root pump in J-PARC
linac beam dump
Proc. Ann. Mtg. PASJ (internet), 726-730 (2022)
B-090
T. Shibata, et al.
Evaluation of RF antenna lifetime after longterm operation of J-PARC ion source
Proc. Ann. Mtg. PASJ (internet), 863-867 (2022)
B-091
K. Hirano, et al.
Multiple irradiation experiment of tungsten
materials by negative hydrogen ion beam (1)Study of beam target materials
Proc. Atomic Energy Society of Japan, 3H08
(2022)B-092
M. Fukuda, et al.
Multiple irradiation experiment of tungsten
materials by negative hydrogen ion beam (2)Evaluation as material for ITER divertor
Proc. Atomic Energy Society of Japan, 3H09
(2022)
B-093
K. Tokunaga, et al.
Multiple irradiation experiment of tungsten
materials by negative hydrogen ion beam(3) Observation of material degradation bymultiple irradiation
Proc. Atomic Energy Society of Japan, 3H10
(2022)B-094
M. Kamibayashi, et al.
Single Bit Upsets Versus Burst Errors of
Stacked-Capacitor DRAMs Induced by
High-Energy Neutron -SECDED Is No Longer
EffectiveProc. Eur. Conf. Radiat. Its Eff. Compon. Syst.
RADECS (2022).

Publications

J-PARC Annual Report 2022

94
B-095
H. Hotchi, et al.
1 MW J-PARC RCS Beam Operation and
Further Beyond
Proc. HB2021, MOIPI1 (2022)
B-096
B. Yee-Rendon, et al.
Status of the JAEA-ADS Superconducting
LINAC Design
Proc. HB2021, MOP04 (2022)
B-097
T. Toyama, et al.
Beam Instability Issue and Transverse
Feedback System in the MR of J-PARC
Proc. HB2021, THAC1 (2022)
B-098
M. Tomizawa, et al.
Slow Extraction Operation at J-PARC Main
Ring
Proc. HB2021, THDC1 (2022)
B-099
K. Satou, et al.
MERITS OF PULSE MODE OPERATIONOF RESIDUAL GAS IONIZATION PROFILEMONITOR FOR J-PARC MAIN RING
Proc. IBIC2022, 434 (2022)
B-100
R. KitamuraFirst Measurement of Longitudinal Profile ofHigh-Power and Low-Energy H− Beam byUsing Bunch Shape Monitor with Graphite
TargetProc. IBIC2022, 532 (2022)
B-101
M. Yamamoto, et al.
Influence of a positive grid biasing on RF
system in J-PARC RCS
Proc. IPAC2022 (Internet), 1336 - 1338 (2022)
B-102
Y. Sumi, et al.
FABRICATION AND LOW-POWER TEST OF
DISK-AND-WASHER CAVITY FOR MUONACCELERATION
Proc. IPAC2022 (Internet), 1534-1537 (2022)
B-103
Y. Shobuda, et al.
Measurements of radiation fields from aceramic break
Proc. IPAC2022 (Internet), 1663 - 1666 (2022)
B-104
Y. Takeuchi, et al.
muon g−2 and electric dipole moment
experimentProc. IPAC2022 (Internet), 94-97 (2022)
B-105
H. Okita, et al.
DESIGN STUDIES ON A HIGH-POWER WIDE-BAND RF COMBINER FOR CONSOLIDATION
OF THE DRIVER AMPLIFIER OF THE J-PARC
RCS
Proc. IPAC2022, 1333 (2022)

20-YEAR COLLABORATION ON
SYNCHROTRON RF BETWEEN CERN AND
J-PARC
Proc. IPAC2022, 3130 (2022)

B-106
M. Yamamoto, et al.
INFLUENCE OF A POSITIVE GRID BIASING ON
RF SYSTEM IN J-PARC RCS
Proc. IPAC2022, 1336 (2022)

B-116
T. Sugimoto, et al.
IMPROVEMENT OF MATCHING CIRCUITFOR J-PARC MAIN RING INJECTION KICKERMAGNET
Proc. IPAC2022, 316 (2022)

B-107
Y. Takeuchi, et al.
FABRICATION AND LOW-POWER TEST OF
DISK-AND-WASHER CAVITY FOR MUONACCELERATION
Proc. IPAC2022, 1534 (2022)
B-108
P.K. Saha, et al.
RECENT RESULTS OF BEAM LOSS MITIGATIONAND EXTREMELY LOW BEAM LOSSOPERATION OF J-PARC RCS
Proc. IPAC2022, 1616 (2022)
B-109
S. Iwata, et al.
SIMULATION STUDY OF FAST EXTRACTION IN
THE ABSENCE OF ONE SEPTUM MAGNET FOR
J-PARC MAIN RING
Proc. IPAC2022, 2100 (2022)
B-110
S. Iwata, et al.
UPGRADE OF SEPTUM MAGNETS FOR FASTEXTRACTION IN J-PARC MAIN RING
Proc. IPAC2022, 2103 (2022)
B-111
K. Hasegawa, et al.
STATUS AND UPGRADE PLAN OF THE MR
RING RF SYSTEMS IN J-PARC
Proc. IPAC2022, 2131 (2022)
B-112
T. Shibata, et al.
THE NEW EDDY CURRENT TYPE SEPTUM
MAGNET FOR UPGRADING OF FASTEXTRACTION IN MAIN RING OF J-PARC
Proc. IPAC2022, 2428 (2022)
B-113
T. Shibata, et al.
THE REDUCTION OF THE LEAKAGE FIELD OF
THE INJECTION SEPTUM MAGNET IN MAIN
RING OF J-PARC
Proc. IPAC2022, 2774 (2022)
B-114
T. Shibata, et al.
THE NEW HIGH FIELD SEPTUM MAGNET FOR
UPGRADING OF FAST EXTRACTION IN MAIN
RING OF J-PARC
Proc. IPAC2022, 2788 (2022)
B-115
C. Ohmori, et al.

B-117
K. Sumi, et al.
DESIGN AND BEAM DYNAMICS STUDY OF
DISK-LOADED STRUCTURE FOR MUON LINAC
Proc. IPAC2022, 94 (2022)
B-118
Y. Nakazawa, et al.
HIGH-POWER TEST OF AN APF IH-DTL
PROTOTYPE FOR THE MUON LINAC
Proc. LINAC2022 (Internet), 275-278(2022)
B-119
Y. Takeuchi, et al.
END-TO-END SIMULATIONS AND ERRORSTUDIES OF THE J-PARC MUON LINAC
Proc. LINAC2022 (Internet), 562-564(2022)
B-120
Y. Kono, et al.
THE MUON LINAC PROJECT AT J-PARC
Proc. LINAC2022 (Internet), 636-640(2022)
B-121
J. Tamura, et al.
ACCELERATION EFFICIENCY OF TE-MODE
STRUCTURES FOR PROTON LINACS
Proc. LINAC2022, 177-179 (2022)
B-122
J. Tamura, et al.
Current Status of the Spoke Cavity
Prototyping for the JAEA-ADS Linac
Proc. LINAC2022, 180-183 (2022)
B-123
Ersin CICEK, et al.
IMPLEMENTATION OF AN ADVANCED M
TCA.4-BASED DIGITIZER FOR MONITORING
COMB-LIKE BEAM AT THE J-PARC LINAC
Proc. LINAC2022, 219 (2022)
B-124
Y. Nakazawa, et al.
HIGH-POWER TEST OF AN APF IH-DTL
PROTOTYPE FOR THE MUON LINAC
Proc. LINAC2022, 275 (2022)
B-125
B. Yee-Rendon, et al.
Overview of ADS Projects in the World
Proc. LINAC2022, 310-313 (2022)
B-126
Y. Fuwa, et al.

J-PARC Annual Report 2022

Publications

95
Design of Beam Focusing System with
Permanent Magnet for J-PARC LINAC MEBT1
Proc. LINAC2022, 364-376 (2022)
B-127
Y. Takeuchi, et al.
END-TO-END SIMULATIONS AND ERRORSTUDIES OF THE J-PARC MUON LINAC
Proc. LINAC2022, 562 (2022)

B-128
Y. Kondo, et al.
THE MUON LINAC PROJECT AT J-PARC
Proc. LINAC2022, 636 (2022)

B-130
D. Barrow, et al.
T2KSK Joint ν Oscillation Sensitivity
Proceedings of Science, NOW2022, 8 (2022)

B-129
Min YANG, et al.
APPLICATIONS OF TIMING READ-BACKSYSTEM IN J-PARC MAIN RING
Proc. PCaPAC2022, 8 (2022)

B-131
崔烘福, et al.
中性子イメージング技術を用いた接着系あと施工アンカーにおける 接着剤未充填部の特定手法
日本地震工学会・大会2022, (2022).

KEK Reports
C-001
Safety Division, J-PARC Center
Annual Report on the Activities of Safety in
J-PARC, FY2021
KEK Internal 2022-007
C-002
Belle Collaboration
Measurement of Two-Particle Correlations ofHadrons in e+ e- Collisions at Belle
KEK Preprint 2021-57; Belle Preprint 2021-32
C-003
Belle Collaboration
Search for the decay Bs → η' KS0
KEK Preprint 2021-58; Belle Preprint 2022-01
C-004
Belle Collaboration
Search for charged lepton flavor violating
decays of Υ(1S)
KEK Preprint 2021-59; Belle Preprint 2022-02
C-005
Belle Collaboration
Search for B0 → K 0S K 0S γ decays at Belle
KEK Preprint 2021-62; Belle Preprint 2022-03
C-006
Belle Collaboration
Measurements of the branching fractions
B(B 0 → D*+π?) and B (B 0 → D*+K?) and testsof QCD factorization
KEK Preprint 2022-1; Belle Preprint 2022-10
C-007
Belle Collaboration
Two-particle angular correlations ine+ e&#8722; collisions to hadronic final statesin two reference coordinates at Belle
KEK Preprint 2022-10; Belle Preprint 2022-11
C-008
Belle Collaboration
First search for the weak radiative decays
Λ+c → Σ+γ and Ξ 0c → Ξ 0γ
KEK Preprint 2022-11; Belle Preprint 2022-12
C-009
Belle Collaboration
Search for X(3872) → π +π -π 0 at Belle
KEK Preprint 2022-12; Belle Preprint 2022-13

C-010
Belle II Collaboration
Measurement of the Λ+c lifetime
KEK Preprint 2022-13; Belle II Preprint 2022-003
C-011
Belle Collaboration
Observation of Omega(2012) → Xi(1530)
K-bar and measurement of the couplings ofOmega(2012) → Xi(1530)K-bar and XiK-ba
KEK Preprint 2022-14; Belle Preprint 2022-14
C-012
Belle Collaboration
Measurement of the B+/B0 production ratio
in e+ e- collisions at the Υ (4S) resonanceusing B → J/ψ(ll)K decays at Belle
KEK Preprint 2022-15; Belle Preprint 2022-15
C-013
Belle Collaboration
Measurement of the branching fraction andsearch for CP Violation in D0 → K0S K0S π + π decays at Belle
KEK Preprint 2022-19; Belle Preprint 2022-16;
UCHEP-22-002
C-014
Belle Collaboration
Measurement of the branching fractions for
Cabibbo-suppresseddecays D+ → K +K -π +π 0
and D+s → K +π -π +π 0 at Belle
KEK Preprint 2022-2; Belle Preprint 2022-04
C-015
Belle Collaboration
Search for baryon CP violation,measurement of branching fractionsand
decay asymmetry parameters for Λ+c → Λh+and Λ+c → Σ0h+(h=K,π)KEK Preprint 2022-22; Belle Preprint 2022-17;
UCHEP-22-04
C-016
Belle Collaboration
First measurement of the B+ → π+π0π0branching fraction andCP asymmetry
KEK Preprint 2022-23; Belle Preprint 2022-18
C-017
Belle II Collaboration
Observation of e+e- → ωχ_bJ(1P) and search

for X_b → ωΥ(1S) at √s near 10.75 GeV
KEK Preprint 2022-24; Belle II Preprint 2022-004
C-018
Belle Collaboration
Measurements of branching fractions of
Λ+c →Σ+η and Λ+c →Σ+η' and asymmetry
parameters of Λ+c →Σ+π0, Λ+c →Σ+η, and Λ+c→Σ+η'KEK Preprint 2022-25; Belle Preprint 2022-19
C-019
Belle II Collaboration
Measurement of the Ω0c lifetime at Belle II
KEK Preprint 2022-26; Belle II Preprint 2022-005
C-020
Belle Collaboration
Evidence for the singly Cabibbo-suppressed
decay Ω0c → Ξ- π + and search for Ω0c → Ξ- K+and Ω0c → Ω-K+ decays at Belle
KEK Preprint 2022-28; Belle Preprint 2022-20
C-021
Belle Collaboration
Observation of a Threshold Cusp at the Λη
Threshold in the pK- Mass Spectrum with
Λ+c → pK - π + Decays
KEK Preprint 2022-29; Belle Preprint 2022-21
C-022
Belle Collaboration
Search for D+ → K - K 0S π + π + π 0 at Belle
KEK Preprint 2022-3; Belle Preprint 2022-05
C-023
Belle Collaboration
Studies of e+ e- → ηφ via Initial State
Radiation
KEK Preprint 2022-30; Belle Preprint 2022-22
C-024
Belle Collaboration
Search for rare decays B+ → D*s +η, D*s + K 0,
D*+η, and D+ K0
KEK Preprint 2022-31; Belle Preprint 2022-23
C-025
Belle Collaboration
Measurement of branching fractions of
Λ+c → p K 0S K 0S and Λ+c → p K 0S η at Belle
KEK Preprint 2022-33; Belle Preprint 2022-24

Publications

J-PARC Annual Report 2022

96
C-026
Belle Collaboration
Study of B+ → p n π0
KEK Preprint 2022-34; Belle Preprint 2022-25
C-027
Belle Collaboration
Study of e+ e- → Σ0Σ0 and Σ+Σ- by Initial
State RadiationMethod at Belle
KEK Preprint 2022-35; Belle Preprint 2022-26
C-028
Belle Collaboration
Search for heavy neutrino in tau decays at
Belle
KEK Preprint 2022-36; Belle Preprint 2022-27
C-029
Belle Collaboration
Measurement of the mass and width ofthe Λ c(2625)+ and the branching ratios ofΛ c(2625)+ → Σ0c π+ and Λ c(2625)+ → Σ ++c πKEK Preprint 2022-37; Belle Preprint 2022-28
C-030
Belle Collaboration
First observation of Λπ+ and Λπ- signals
near the K N (I =1) mass threshold in Λ+c →Λ+π++π++π- decay
KEK Preprint 2022-38; Belle Preprint 2022-29
C-031
Belle II Collaboration
Search for lepton-flavor-violating tau decays
to a lepton and an invisible boson at Belle II
KEK Preprint 2022-39; Belle II Preprint 2022-007
C-032
Belle Collaboration
Measurement of the branching fraction ofΞ 0c → Λ+c π- at Belle
KEK Preprint 2022-4; Belle Preprint 2022-06
C-033
Belle II Collaboration
Search for an invisible Z' in a final state withtwo muons and missing energy at Belle II
KEK Preprint 2022-40; Belle II Preprint 2022-008
C-034
Belle Collaboration
Search for the lepton flavour violating
decays B+ → K+ τ ± ℓ (ℓ = e, µ) at Belle
KEK Preprint 2022-41; Belle Preprint 2022-30
C-035
Belle Collaboration
First observation of B→D 1 (→ D π + π -) ℓ+ νℓand measurement of the B→D (*)πℓ+νℓ and
B→D (*)π + π -ℓ+νℓ branching fractions withhadronic tagging at Belle
KEK Preprint 2022-44; Belle Preprint 2022-32
C-036
Belle Collaboration
Angular analysis of the low M(K+K-) mass
enhancement in B+→K+K-π+ decays
KEK Preprint 2022-5; Belle Preprint 2022-07
C-037
Belle II Collaboration
Search for a dark photon and an invisible
dark Higgs in µ+ µ- and missing energy final
states with the Belle II experiment
KEK Preprint 2022-6; Belle II Preprint 2022-001

KEK Preprint 2022-7; Belle Preprint 2022-08
C-039
Belle Collaboration
Measurement of two-photon decay width of
χc2(1P) in γγ→χc2(1P)→J/ψγ at Belle
KEK Preprint 2022-8; Belle Preprint 2022-09
C-040
Belle II Collaboration
Measurement of Lepton Mass Squared
Moments in B → X c ℓ νℓ Decays with the
Belle II Experiment
KEK Preprint 2022-9; Belle II Preprint 2022-002
C-041
I. Yamane
Laser Charge-Exchange of J-PARC 400 MeV
H-Beam with 2 Pulse Laser Storage Ring
KEK Report 2022-1
C-042
I. Yamane
Laser Charge-Exchange Injection for HighIntensity Proton Accelerator
KEK Report 2022-4
C-043
2022年度サマーチャレンジ編集委員会、土手昭伸、
長谷川雅也 (KEK, Tsukuba)
第16回大学生・高校生のための素粒子・原子核スクール サマーチャレンジ：宇宙、物質、生命―21世紀の謎に挑む 2022講義テキスト、2022年8月17日～26
日 (To be filed on the bookshelf: P0.22:S:8.16.1
KSC22-010

C-038
Belle Collaboration
Evidence of a new excited charmed baryon
decaying to Σc(2455)0,++π±

JAEA Reports
D-001
R. Kitamura
Highly durable and multifunctional ion
beam monitor
JAEA Technology Seeds, 8, p. 68

D-004
K. Nakano, et al.
Neutronic Analysis of Beam Window and LBEof an Accelerator-Driven System
JAEA-Research 2021-018 (2022)

D-007
H. Obayashi, et al.
Development of Mock-up Test Loop
(IMMORTAL) for LBE Spallation Target
JAEA-Technology 2021-035 (2022)

D-002
H. Iwamoto, et al.
Radiation shielding analysis of the upper
structure of an accelerator-driven system
JAEA-Research 2021-012 (2022)

D-005
Safety Division, J-PARC Center
Annual Report on the Activities of Safety in
J-PARC, FY2021
JAEA-Review 2022-074(2022)

D-008
A. Ono, et al.

D-003
K. Nakano, et al.
Measurement of Nuclide Production Crosssections in High-energy Proton-induced
Spallation Reactions at J-PARC
JAEA-Research 2021-014 (2022)

D-006
S. Saito, et al.
Development of High Temperature LBE
Corrosion Test Loop "OLLOCHI"JAEA-Technology 2021-034 (2022)

加速器装置メンテナンスを安全に進める上での注意点と要領

JAEA-Technology 2021-044, p.53 , 2022/03

J-PARC Annual Report 2022

Publications

97

OthersE-001
H. Aoyagi, et al.
Reports on the 11th Internationla Beam
Instrumentation Conference, IBIC2022
Kasokuki 19, No. 4, p. 237

E-002
R. Kitamura, et al.
BEAM PROFILE MONITOR
Unexamined patent publication bulletin, JP,2022027504

J-PARC Annual Report 2022
Vol.1: Highlight© J-PARC Center
December 2023

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