J-PARC Project Newsletter No.102, April dispatch
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J-PARC Project Newsletter
No.102, April 2026
Japan Proton Accelerator Research Complex under joint operation by the
High Energy Accelerator Research Organization (KEK) and the Japan Atomic
Energy Agency (JAEA)
http://j-parc.jp/index-e.html
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HEADLINES AND CONTENTS
1. [Overview]
- STABLE OPERATION FROM LAST OCTOBER TO MARCH
- MR SUCCEEDED IN A 1 MW DEMONSTRATION OF FAST EXTRACTION FOR NEUTRINO BEAM, A BIG MILESTONE TOWARD HYPER-KAMIOKANDE EXPERIMENT
- TWO PROJECTS FROM J-PARC APPROVED UNDER THE SPACE STRATEGY FUND
- INTERNATIONAL ADVISORY COMMITTEE WAS HELD
❋ J-PARC has suspended operations since April 7 due to a fire that occurred at the 50 GeV substation. Further details will be provided in the next issue.
2. [Accelerator Division]
- OPERATION STATUS OF THE ACCELERATORS
- ACCELERATOR TECHNICAL ADVISORY COMMITTEE (A-TAC) MEETING WAS HELD
- THE RCS BEAM COMMISSIONING GROUP, REPRESENTED BY DR. PRANAB KUMAR SAHA, HAS WON THE SUWA PRIZE
3. [Particle and Nuclear Physics Division]
- PROGRAM ADVISORY COMMITTEE MEETING
- ACHIEVEMENT OF STABLE 900 kW HIGH-POWER OPERATION AT THE NEUTRINO EXPERIMENTAL FACILITY AND THE INTERNATIONAL ADVISORY COMMITTEE MEETING TOWARD THE HYPER-KAMIOKANDE PROJECT
- STATUS OF THE JSNS2 / JSNS2-II (SEARCH FOR STERILE NEUTRINOS AT J-PARC MLF, E56 / E82)
- MAJOR HONORS FOR KEK/J-PARC RESEARCH: SUWA PRIZE FOR TWO PIONEER LEADERS OF RARE K DECAY EXPERIMENTS AND AWARD-WINNING RESULTS FROM THE J-PARC E40 EXPERIMENT
- STATUS OF THE COMET EXPERIMENT
- STATUS OF THE MUON g-2/ELECTRIC DIPOLE MOMENT (EDM) (E34)
4. [Materials and Life Science Division]
- NEUTRON SOURCE, CONTINUATION OF STABLE BEAM OPERATION
- MLF ADVANCES TOWARD 2026A WITH NEW PROPOSAL CALL, ADVISORY REVIEWS, AND A SERIES OF KEY MEETINGS
- DR. SHINOHARA TAKENAO OF THE NEUTRON SCIENCE SECTION AND COLLEAGUES RECEIVE THE KOSHIBA AWRAD
- SYMPOSIUM AND WORKSHOP
- MUON SCIENCE FACILITY (MUSE), MAC WAS HELD
5. [Nuclear Transmutation Division]
- THE TECHNICAL ADVISORY COMMITTEE (T-TAC) MEETING WAS HELD
6. [Safety Division]
- 10TH SYMPOSIUM ON SAFETY IN ACCELERATOR FACILITIES
7. [Outreach Activities]
8. [Editorial Note]
PAST ISSUES ARE AVAILABLE FROM THE LINK BELOW.
http://j-parc.jp/c/en/topics/project-newsletter/index.html
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1. [Overview] by KOBAYASHI Takashi
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STABLE OPERATION FROM LAST OCTOBER TO MARCH
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J-PARC has maintained stable user operations from October through March for both accelerators and experimental facilities following the summer maintenance period. All major facilities delivered beams reliably, supporting a wide range of scientific programs. This steady performance reflects continued improvements in operational efficiency and coordination across the complex.
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MR SUCCEEDED IN A 1 MW DEMONSTRATION OF FAST EXTRACTION FOR NEUTRINO BEAM, A BIG MILESTONE TOWARD HYPER-KAMIOKANDE EXPERIMENT
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The Main Ring (MR) successfully demonstrated 1 MW beam power with fast extraction for the neutrino beamline. This achievement represents a significant milestone toward the realization of the Hyper-Kamiokande experiment. It confirms both the technical readiness and the stability required for future high-power neutrino operations.
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TWO PROJECTS FROM J-PARC APPROVED UNDER THE SPACE STRATEGY FUND
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Two proposals from J-PARC have been selected under Japan's Space Strategy Fund program. One project will establish a proton irradiation facility by branching the beam from the LINAC, while the other will construct a new proton beamline and irradiation facility in the hall of the Hadron Experimental Facility. Both projects aim to provide test environments for radiation-induced soft errors in semiconductors and electronic systems, supporting space and advanced technology applications.
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INTERNATIONAL ADVISORY COMMITTEE WAS HELD
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The International Advisory Committee (IAC) meeting was held this year in a fully remote format, similar to the arrangement adopted during the COVID-19 period. External experts reviewed J-PARC's recent progress and future plans, providing valuable feedback on scientific priorities, facility upgrades, and long-term strategy. Their recommendations will contribute to shaping the next phase of J-PARC development.
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2. [Accelerator Division] by YAMAMOTO Kazami
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OPERATION STATUS OF THE ACCELERATORS
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After the New Year's holiday, beam commissioning resumed on January 9 as part of Run #93, which began in October. The user program for the Materials and Life Science experimental Facility (MLF) restarted on January 15, followed by the Neutrino Facility (NU) on January 22nd. The user program for the Materials and Life Science experimental Facility (MLF) restarted on January 15th, followed by the Neutrino Facility (NU) on January 22.The beam power was approximately 700 kW for the MLF and 900 kW for the NU. User operations at both facilities proceeded smoothly and are scheduled to continue until March 25. After the completion of the user run, maintenance work will be carried out on the accelerators. In addition, MR successfully demonstrated a 1 MW beam acceleration for NU.
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ACCELERATOR TECHNICAL ADVISORY COMMITTEE (A-TAC) MEETING WAS HELD
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The 25th A TAC meeting (https://j-parc.jp/c/en/forum-and-committee/a-tac-e.html) was held from February 12 to 14 in a hybrid format, with most members participating on-site. (Seven of the nine committee members attended in person.) The main topics of discussion were the accelerator status and the responses to previous recommendations. The committee also noted J PARC's steady progress, including high power MR operation, while emphasizing the need to strengthen engineering resources and enhance cross divisional collaboration to support future reliability and upgrades.
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THE RCS BEAM COMMISSIONING GROUP, REPRESENTED BY DR. PRANAB KUMAR SAHA, HAS WON THE SUWA PRIZE
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The RCS Beam Commissioning Group, represented by Dr. SAHA Pranab Kumar, has been awarded the Suwa Prize by the Foundation for High Energy Accelerator Science (FAS). The award recognizes the group's significant contributions to the stable operation of the J-PARC RCS. Through rigorous beam simulations and systematic experiments, the group successfully minimized beam emittance and beam losses during the 1 MW operation of the MLF, thereby significantly increasing the beam power in the Main Ring. These achievements were published in Physical Review Accelerators and Beams (selected as an Editors' Suggestion) and have garnered international recognition.
https://www.j-parc.jp/c/en/topics/2026/03/11001783.html
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3. [Particle and Nuclear Physics Division]
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PROGRAM ADVISORY COMMITTEE MEETING (by NAKADAIRA Takeshi)
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The 41st Program Advisory Committee (PAC) meeting was held on January 21-23, 2026. Updates were provided on the status of J-PARC accelerator operations following the summer maintenance in 2025, prospects for Main Ring (MR) beam power improvements, and the status of experiments along with plans for operations leading up to summer 2026. A summary of experimental proposals for the coming years was also presented.
This time, one proposal was submitted.
Details can be found at the following link:
https://kds.kek.jp/event/58237/
The PAC report will be available on the following webpage:
https://j-parc.jp/researcher/Hadron/en/PAC_for_NuclPart_e.html
The next PAC meeting is scheduled to be held in July 2026.
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ACHIEVEMENT OF STABLE 900 kW HIGH-POWER OPERATION AT THE NEUTRINO EXPERIMENTAL FACILITY AND THE INTERNATIONAL ADVISORY COMMITTEE MEETING TOWARD THE HYPER-KAMIOKANDE PROJECT (by ISHIDA Taku)
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The Neutrino Experimental Facility had been operating at 750 kW until December 2025. In January 2026, the repetition cycle was shortened from 1.36 s to 1.28 s, enabling higher repetition-rate operation. As a result, acceleration of 2.4 × 1014 protons per pulse--representing a world record for a synchrotron--enabled operation at 900 kW, which is the upper limit acceptable for the current target system. From late November 2025 to March 2026, the beamline achieved an operational availability of 85%, providing highly stable data acquisition. This achievement represents an important step toward long-term stable operation at the MW-class level and contributes to strengthening the foundation for the realization of the Hyper-Kamiokande project, scheduled to start in JFY2028.
Upgrades to the beamline system required for 1.3 MW operation--including improvements to remote maintenance in the final focusing magnet section, the target and its cooling system, and the secondary beamline cooling water system--are scheduled for summer 2026.
To discuss the validity of these upgrade plans and technical challenges toward MW-class beam operation, such as optimization of replacement cycles for the target and beam window, an International Advisory Committee meeting was held on February 16-17, 2026. During the meeting, valuable comments were provided by committee members with extensive experience in the operation of high-power target facilities worldwide.
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STATUS OF THE JSNS2 / JSNS2-II (SEARCH FOR STERILE NEUTRINOS AT J-PARC MLF, E56 / E82) (by MARUYAMA Takasumi)
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The JSNS2 (E56) / JSNS2-II (E82) collaboration investigates the anomaly reported by the LSND experiment, namely the observed excess of electron antineutrinos, through a direct measurement at the J-PARC Materials and Life Science Experimental Facility (MLF).
Data taking with both the near detector, located on the third floor of the MLF, and the far detector, installed outside the MLF building, has been ongoing since November 2025. As of 12 March 2026, new physics data corresponding to 9.088×1021 Proton-On-Target (POT) have been accumulated for the near detector. This already corresponds to approximately 19% of the total data accumulated between 2021 and 2024. The current run is scheduled to continue until June 2026.
In parallel with the ongoing data-taking efforts, we have also presented and published the first results of our studies based on data collected in 2022 (http://arxiv.org/abs/2602.06274). The new far detector is currently in the commissioning phase. Analysis of the beam commissioning data indicates that the rate of beam-induced neutrons is higher than expected. To mitigate this issue, effective passive shielding is being investigated through various measurements.
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MAJOR HONORS FOR KEK/J-PARC RESEARCH: SUWA PRIZE FOR TWO PIONEER LEADERS OF RARE K DECAY EXPERIMENTS AND AWARD-WINNING RESULTS FROM THE J-PARC E40 EXPERIMENT (by NOMURA Tadashi and TAKAHASHI Hitoshi)
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Researchers and experiments at KEK and J-PARC have recently received significant recognition from the scientific community for their contributions to particle and nuclear physics. Two pioneer leaders of rare kaon decay experiments were awarded the 2025 Suwa Prize, honoring their long-standing leadership and groundbreaking work in the field. In addition, the J-PARC E40 experiment was honored with the 31st Outstanding Paper Award from the Physical Society of Japan, recognizing the impact of its published results. Together, these achievements highlight the continued global influence of KEK and J-PARC in advancing our understanding of fundamental particles and interactions.
The KOTO experiment at the Hadron Experimental Facility is the world-leading experiment dedicated to searching for the CP-violating rare kaon decay, where a long-lived neutral kaon decays to a neutral pion and a neutrino-antineutrino pair. Although the decay mode is attractive because the theoretical uncertainty of the branching ratio is small, and thus it can be a good probe to study physics beyond the Standard Model, realization of the experiment had been thought to be extremely difficult. However, two pioneer leaders and their experimental teams have successfully realized it.
The first dedicated experiment to search for the KL→π0νν decay was conducted at KEK 12 GeV proton synchrotron by KEK E391a group in the early 2000s, led by Professor Takao Inagaki (KEK). He brought unique ideas for the experiment, such as a thin neutral beam, a hermetic veto system that ensures no extra particle other than two photons from π0 decay, and a differential pumping scheme that enables a clean vacuum at a level of 1e-5 Pa separated by a thin film from a low vacuum region (～0.1 Pa) for the detectors.
Its successor is the KOTO experiment, led by Professor Taku Yamanaka (University of Osaka), utilizing the high intensity proton beam at J-PARC. He has been a world leader of kaon physics through the KTeV experiment at Fermi National Laboratory in the U.S. and introduced the high-resolution electromagnetic calorimeter based on ~2700 undoped CsI crystals used in KTeV to KOTO. Under his leadership, KOTO achieved the world-best sensitivity of the search, which corresponds to more than an order of magnitude improvement of the world record.
In recognition of the establishment of an innovative experimental method to study the KL→π0νν decay and long-term contributions to the new physics search, professors emeritus T. Inagaki and T. Yamanaka received Suwa Prize of the year 2025 (by Foundation for High Energy Accelerator Science). The awards ceremony was held on February 27, 2026.
KOTO continues accumulating data for several years toward another order of magnitude improvement, seeking a signature of new physics.
A paper published by the J-PARC E40 experiment has received the 31st Outstanding Paper Award of the Physical Society of Japan.
The E40 experiment was conducted at the K1.8 beamline of the Hadron Experimental Facility with the aim of performing high-statistic measurements of hyperon-nucleon scattering.
The award-winning paper reports the measurement results for the differential cross section of elastic scattering between Sigma+ hyperons and protons with a statistical precision 100 times greater than that of previous experiments.
Through phase analysis, it derived the magnitude of the repulsive force between the two particles for the first time in the world, representing a highly significant achievement in elucidating the origin of the repulsive core of the nuclear force.
See the paper: T. Nanamura et al, "Measurement of differential cross sections for Sigma+p elastic scattering in the momentum range 0.44-0.80 GeV/c," Prog. Theor. Exp. Phys. 2022, 093D01. https://doi.org/10.1093/ptep/ptac101
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STATUS OF THE COMET EXPERIMENT (by FUKAO Yoshinori)
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Construction of the COMET experiment, which aims to search for muon-to-electron conversion with a Phase-I sensitivity of 10-14 or better, is underway.
Installation of the detector solenoid magnet (DS) and the bridge solenoid (BS) was successfully completed last December, thanks to the great efforts of the J-PARC cryogenic section. With their completion, all superconducting magnets for COMET Phase-I are now present in the experimental hall. The DS and BS, as well as the muon transport solenoid (MTS), have been cooled down as expected, and their commissioning to reach the designed operating current is in progress. This series of activities will be followed by a campaign of magnetic field measurements inside the DS, which is one of the important milestones toward the physics measurements. Detector assembly and operation tests are also being continuously carried out at J-PARC in preparation for installation into the DS later this year.
The 48th collaboration meeting was held at Yokohama National University (YNU) in March. The experimental status and technical issues were presented and discussed in order to accomplish the construction in an optimized configuration. An impressive discussion on theoretical aspects was also held since one of the theory groups in the COMET collaboration is affiliated with YNU.
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STATUS OF THE MUON g-2/ELECTRIC DIPOLE MOMENT (EDM) (E34) (by MIBE Tsutomu)
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The E34 collaboration aims for precision measurements of the muon anomalous magnetic moment and its electric dipole moment.
The collaboration carried out the commissioning of the surface muon beam in the MLF H line. Silicon strip detectors, which will be used as positron tracking detectors, were installed in the muonium hyperfine structure measurement experiment (MuSEUM), and data acquisition of positrons from muon decay was performed for its evaluation. In November, tests and performance evaluations of the Ultra-slow muon Diagnostic Line (UDL) were carried out in the S2 area, confirming its basic performance. In December, the system was moved to the H2 area. In parallel, the group prepared the laser system for muonium ionization using a Lyman-α laser. By the end of December, the collaboration had successfully generated, ionized, and extracted muonium in the H2 area. Since then, the muon source has been reconfigured so that it can be connected to the RF accelerating cavity. In parallel, preparations for the operation of the RFQ accelerating cavities are underway. In the future, we plan to test the ultra-cold muon source and to demonstrate RF acceleration up to an energy of 0.3 MeV in the 2026A period. A research group from INFN (Italy) and Osaka Metropolitan University has newly joined the collaboration.
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4. [Materials and Life Science Division]
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NEUTRON SOURCE, CONTINUATION OF STABLE BEAM OPERATION (by HARADA Masahide)
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Beam operation at the MLF resumed at 780 kW on October 30, 2025. The beam power was adjusted to 710 kW on November 27 due to a change in the MR accelerator mode. Although issues occurred in the cooling water system and the cryogenic system of the neutron source during the beam operation, they were resolved through several measures. As of the end of March 2026, the beam operation has continued, following a brief shutdown over the New Year holiday period. The neutron source has maintained excellent operational stability, achieving a facility availability of over 92%.
Finally, from January 26 to 29, 2026, a joint workshop on neutron sources was held at J-PARC with the Spallation Neutron Source (SNS) group of Oak Ridge National Laboratory (ORNL). In-depth discussions were conducted on operational status, technical issues, research and development activities, and future research collaboration related to the neutron source.
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MLF ADVANCES TOWARD 2026A WITH NEW PROPOSAL CALL, ADVISORY REVIEWS, AND A SERIES OF KEY MEETINGS (by NAKAMURA Mitsutaka)
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The call for neutron general proposals for the 2026A cycle has opened. The general proposal category covers short-term experimental assignments, including one year proposals. A total of 324 applications were submitted for neutron experiments alone, which is almost the same as the average in recent cycles. In the 2025B term, the MLF call was open only to domestic users, as the available beam time was quite limited. Proposals originating from overseas accounted for 54% of the total, which was roughly the same proportion as in 2025A. All programs were reviewed at the MLF Advisory Board on March 10.
Report on Meetings and Other Events:
• Neutron Advisory Committee (NAC), February 16-18
https://kds.kek.jp/event/58692/
Reports were presented on the development status of neutron beamlines, detectors, and sample environments, as well as on industrial applications. Committee members provided advice on data utilization and on the roadmap for future progress.
Recent press release from Neutron Science at MLF:
BL15 and BL18 on Feb. 27 "Multiscale Insights into Sodium Storage in Hard Carbon from Operando Small- and Wide-Angle Neutron Scattering Measurements"
https://doi.org/10.1038/s41586-025-09633-4
BL21 on Feb. 17 "Superprotonic Conduction in Donor Co-Doped Perovskites"
https://doi.org/10.1002/anie.202521773
BL21 and S1 on Jan. 19 "Frustrated random-singlet state with ice-type structural fluctuation in spinel titanates"
https://doi.org/10.1073/pnas.2517926123
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DR. SHINOHARA TAKENAO OF THE NEUTRON SCIENCE SECTION AND COLLEAGUES RECEIVE THE KOSHIBA AWRAD (by NAKAMURA Mitsutaka)
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Dr. SHINOHARA Takenao (J-PARC MLF) and Dr. KATO Satoru and colleagues (Toyota Central R&D Labs., Inc.) received the FY2025 Koshiba Award for "Establishment of multiphase transport visualization methods using energy-selective neutron imaging". They developed an advanced neutron imaging technique to distinguish and visualize water and ice inside operating fuel cells at sub-zero temperatures at BL22 RADEN.
https://www.j-parc.jp/c/en/topics/2026/03/11001784.html
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SYMPOSIUM AND WORKSHOP
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• FY2025 Quantum Beam Science Festa (QBSF) and 17th MLF Symposium, March 12-13 in Mito
At the MLF Symposium held on March 13, facility reports, presentations on recent achievements, and the general meeting of the J-PARC MLF Users Society took place.
• 2nd MLF Roadmap Workshop, March 14 in Mito
Group discussions were conducted across a wide range of scientific and technical fields.
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MUON SCIENCE FACILITY (MUSE), MAC WAS HELD（by KAWAMURA Naritoshi)
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Beam operation is proceeding smoothly following the scheduled shutdown over the New Year's holiday period.
In the Muon Science Proposal Review Committee (MSPRC) meeting, 46 proposals submitted for the 2026A period, including 5 KEK IMSS S2-type proposals, were reviewed, resulting in 38 approved and 8 reserved.
The Muon Advisory Committee (MAC) meeting was held from January 26 to 27, chaired by Prof. Klaus Kirch of the Paul Scherrer Institute (PSI): https://kds.kek.jp/event/57889/.
The facility staff reported the progress in the target system and each beamline. In addition, during the session on prospects for the MLF, discussions were held regarding the MLF-double project, which aims to maximize the results of the current first target station and the second target station (MLF-TS2) project. After two days of thorough discussion, the committee provided us with valuable recommendations. Based on these recommendations, we will strive to ensure stable operations next fiscal year and advance the plans.
Dr. UMEGAKI Izumi received the 2026 Fumiko Yonezawa Memorial Award of the Physical Society of Japan for her work on "Application of muon beam to Li-ion battery research":
https://www.jps.or.jp/english/meetings-and-awards/awards/yonezawa/yonezawa7-2026e.html.
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5. [Nuclear Transmutation Division] by MAEKAWA Fujio
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THE TECHNICAL ADVISORY COMMITTEE (T-TAC) MEETING WAS HELD
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The 11th TEF (Transmutation Experimental Facility) Technical Advisory Committee (T-TAC) meeting was held at the J-PARC Research Building on February 2-3, 2026. Three foreign and two Japanese committee members gathered to review the current progress of planning the Proton Beam Irradiation Facility, an advanced concept of TEF, and related research and development (R&D) studies. At the meeting, after an overview of J-PARC, division staff introduced their activities in two sessions: the facility design update session and the R&D activities session. On the second day, the meeting concluded with a summary talk by the chair, followed by a site tour.
On February 24, 2026, we received the final T-TAC report, which included 27 observations, 28 comments, and a general conclusion. T-TAC provided positive statements such as, "In its current form, the project demonstrates the capacity to deliver tangible impact in the short term while preserving the flexibility required to accommodate longer-term developments."
https://j-parc.jp/c/en/forum-and-committee/t-tac-e.html
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6. [Safety Division] by BESSHO Kotaro, KASUGAI Yoshimi
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10TH SYMPOSIUM ON SAFETY IN ACCELERATOR FACILITIES
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The 10th Symposium on Safety in Accelerator Facilities was held on January 29 at the Tokai-mura Industry and Information Plaza (iVil) with 71 participants in a face-to-face format. The topics of the workshop were the current status and challenges in online education for radiation safety and heatstroke prevention measures at accelerator facilities. Seven accelerator facilities introduced their circumstances and approaches to address these issues. In addition, 14 posters highlighting various safety initiatives were displayed, and the coffee break provided an opportunity for information exchange and networking. It is expected that the information shared will be effectively utilized to improve safety at each facility.
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7. [Outreach Activities]
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★ Outreach Lecture at the National Institute of Technology, Ibaraki College (December 24)
https://www.j-parc.jp/c/en/topics/2026/02/27001761.html
★ Outreach Lecture at Yokoshibahikari Town Community Center, Sambu District, Chiba Prefecture (January 17)
https://www.j-parc.jp/c/en/topics/2026/02/03001732.html
★ Outreach Lecture at Muramatsu Elementary School, Tokai Village (January 27)
https://www.j-parc.jp/c/en/topics/2026/02/03001732.html
★ Outreach Lecture at Nagi Junior High School, Nagi Town, Okayama Prefecture (February 6)
https://www.j-parc.jp/c/en/topics/2026/02/10001733.html
★ Kojima Children's Science Park (February 21)
https://www.j-parc.jp/c/en/topics/2026/04/27001796.html
★ Outreach Lecture at Ishigami Elementary School (February 26)
https://www.j-parc.jp/c/en/topics/2026/04/17001785.html
★ Sakurie Science Festival (March 14)
https://www.j-parc.jp/c/en/topics/2026/04/27001796.html
★ Muographic Investigation of Ancient Burial Mounds in Tokai: Summary of Activities in 2025 (March 15)
https://www.j-parc.jp/c/en/topics/2026/04/27001796.html
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8. [Editorial Note]
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Past issues are available from the link below.
http://j-parc.jp/c/en/topics/project-newsletter/index.html
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┃ Editorial Board:
┃ OGURI Hidetomo (Chair) : oguri.hidetomo[at]jaea.go.jp
┃ SHOBUDA Yoshihiro: yoshihiro.shobuda[at]j-parc.jp
┃ OZAWA Kyoichiro: ozawa[at]post.kek.jp
┃ MARUSAWA Machiko: machiko[at]post.kek.jp
┃ Bruce YEE-RENDON: byee[at]post.j-parc.jp
┃ OGAWA China (Secretary) : ogawa.china[at]jaea.go.jp
┃ * Please replace "(at)" with "@" when you enter an email address.
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