J-PARC Project Newsletter No.100, October dispatch
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J-PARC Project Newsletter
No.100, October 2025
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]
- WORKSHOP WITH HITOTSUBASHI UNIVERSITY
- J-PARC OPEN HOUSE 2025
2. [Accelerator Division]
OPERATION STATUS OF THE ACCELERATORS
3. [Particle and Nuclear Physics Division]
- PROGRAM ADVISORY COMMITTEE MEETING
- COMPLETION OF NEUTRINO TARGET MAINTENANCE AND EXCAVATION OF THE HYPER-KAMIOKANDE CAVERN
- STATUS OF THE JSNS2 / JSNS2-II (SEARCH FOR STERILE NEUTRINOS AT J-PARC MLF, E56 / E82)
- ADVANCING HADRON AND KAON PHYSICS: FROM OPEN HOUSE TO INTERNATIONAL COLLABORATION
- STATUS OF THE COMET EXPERIMENT
- STATUS OF THE MUON g-2/ ELECTRIC DIPOLE MOMENT (EDM) (E34)
4. [Materials and Life Science Division]
- ONGOING MAINTENANCE WORKS DURING THE LONG OUTAGE
- APPROVED PROPOSALS FOR THE 2025B ROUND AND SUMMER STUDENT INTERNS
- RESEARCH RESULTS PRESENTATION MEETING OF J-PARC/MUSE WAS HELD
- USERS GATHER IN TOKYO FOR MLF ROADMAP WORKSHOP
5. [Nuclear Transmutation Division]
MEASUREMENTS OF DISPLACEMENT CROSS-SECTION FOR 440 GEV PROTONS
6. [Safety Division]
- EXHIBITED AT ECO-FES HITACHI 2025
- MUOGRAPHIC INVESTIGATION OF ANCIENT BURIAL MOUNDS IN TOKAI: VISITING THE TORAZUKA KOFUN AND THE JUGORO HOLE CAVE TOMBS
- VISITING LECTURE AT YUNAGO ELEMENTARY SCHOOL, HITACHI CITY
- PARTICIPATION IN THE "ENERGY WORKSHOP"
- SCIENCE SEMINAR AT GEO SPACE ADVENTURE (GSA 2025)
- MUOGRAPHIC INVESTIGATION OF ANCIENT BURIAL MOUNDS IN TOKAI: CREATING A DIORAMA OF FUNATSUKA NO. 2 BURIAL MOUND
- TOKAI VILLAGE ENJOY SUMMER SCHOOL 2025
- CHILDREN'S KASUMIGASEKI OPEN DAYS "LET'S MAKE A KALEIDOSCOPE OF LIGHT"
- J-PARC & NUCLEAR SCIENCE RESEARCH INSTITUTE OPEN HOUSE 2025 - EXPLORING TOMORROW'S WORLD THROUGH SCIENCE -
- VISITING LECTURE AT NAKAMACHI ELEMENTARY SCHOOL, HITACHI-CITY
7. [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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WORKSHOP WITH HITOTSUBASHI UNIVERSITY (JULY 29)
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Under the MoU signed on April 22, 2025, between Hitotsubashi University and the J-PARC Center https://j-parc.jp/c/press-release/2025/04/22001504.html, this workshop was launched as the first initiative under that agreement. Researchers from both institutions gathered to explore the concept of "data-driven science," covering themes such as social data science, statistics, natural language processing, and accelerator data analysis. The event concluded with a discussion among participants, laying the groundwork for future collaborative efforts across the social and natural sciences.
https://data-driven-symphonies.github.io/1st-workhop.html
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J-PARC OPEN HOUSE 2025 (AUGUST 23)
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The J-PARC Open House 2025 was held on August 23, this year, as a joint event with JAEA's Nuclear Science Research Institute.
A total of 1,648 visitors enjoyed guided tours of experimental facilities, interactive exhibits, and hands-on science activities. The event provided a valuable opportunity to share the excitement of J-PARC's research and to inspire the next generation, strengthening our ties with the local community and society at large.
https://j-parc.jp/OPEN_HOUSE/2025/index_e2025.html
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2. [Accelerator Division] by YAMAMOTO Kazami
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OPERATION STATUS OF THE ACCELERATORS
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Due to target troubles at MLF and NU, accelerator operations were suspended as of May 24. After the beam commissioning of the RCS and MR, both facilities began maintenance work. However, only the linac continued with a three-day trial of 50-Hz operation. During this trial, no beam was accelerated; however, all linac components successfully operated at a 50-Hz repetition rate.
During the summer maintenance period, extensive routine work was conducted on each accelerator to maintain its performance. Among many tasks, a large-scale replacement work of the capacitor banks used in the RCS main magnet power supply system was in progress until October because they had deteriorated significantly due to rust.
We are pleased to announce that three J-PARC members--Dr. YAMAMOTO Kazami of the Accelerator Division, Deputy Director Dr. KINSHO Michikazu, and Dr. HAYASHI Naoki of the Administration and Operations Support Division--received the Paper Award from the Atomic Energy Society of Japan for their paper entitled "Design and Actual Performance of the J-PARC 3 GeV Rapid Cycling Synchrotron for High-Intensity Operation."
The paper summarizes the design and improvements that enabled 1-MW beam acceleration in the RCS. It was recognized for its significant contribution to cutting-edge research by supplying a 1-MW proton beam to both the Materials and Life Science Experimental Facility and the Main Ring Synchrotron.
(https://j-parc.jp/c/topics/2025/09/16001612.html
https://www.aesj.net/document/2024AESJ_Awards.pdf in Japanese)
(From Left: Deputy Director Dr. KINSHO Michikazu, Dr. YAMAMOTO Kazami, and Dr. HAYASHI Naoki)
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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 40th Program Advisory Committee (PAC) meeting was held at the J-PARC research building on July 16 -18. The status of the experiments was reported, and prospects for the program from the autumn onwards were discussed. This time, three new proposals at the Hadron Experimental Facility have been submitted.
https://kds.kek.jp/event/56104/
The PAC report will be available through the following web page.
http://j-parc.jp/researcher/Hadron/en/PAC_for_NuclPart_e.html
The next PAC meeting will be held in January 2026.
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COMPLETION OF NEUTRINO TARGET MAINTENANCE AND EXCAVATION OF THE HYPER-KAMIOKANDE CAVERN (by ISHIDA Taku)
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In early March, operations at the neutrino facility were suspended due to a pressure drop in the helium cooling system of the target. The investigation revealed that the cause was a loosened connection in a remotely attachable/detachable flange of the gas piping. Using manipulators in the maintenance area, the flange was remotely re-tightened, successfully stopping the leak. In addition, a new locking mechanism was developed to prevent the flange from loosening, and its installation was successfully carried out under remote control. The operation test of the electromagnetic horn will be conducted to confirm that no loosening occurs under vibration by pulsed current operation. The neutrino facility is now carefully proceeding with maintenance work, aiming to resume beam operation by the end of November.
The installation of the new target is planned for 2026. This target has also been redesigned to withstand the beam power of 1.3 MW planned for the Hyper-Kamiokande experiment.
Meanwhile, excavation of the massive underground cavern that will house the Hyper-Kamiokande detector was completed on July 31, 2025. The main cavern, with a diameter of 69 m and a height of 94 m, is among the largest man-made underground cavities in the world. Completion of this critical phase marks a major milestone, bringing the project significantly closer to the start of observations in 2028.
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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 searches for neutrino oscillation with a short distance by sterile neutrinos at J-PARC MLF.
We are preparing for the next data taking run with both the near detector, which is located on the third floor of MLF, and the far detector, located outside the MLF building. This run will begin with the next beam in October 2025.
At the same time, we are preparing to unblind the signal region data taken in 2022. The agreement between the observed and the expected number of events is good in all side-band regions, as presented in the 40th J-PARC PAC. The unblinded results are expected to be published soon. The new far detector is currently in the commissioning phase. From the beam commissioning data, we found that the number of beam-induced neutrons is larger than expected. The precise sources of these neutrons are being investigated, and we will design an effective passive shield to address this issue.
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ADVANCING HADRON AND KAON PHYSICS: FROM OPEN HOUSE TO INTERNATIONAL COLLABORATION (by NOMURA Tadashi, AGARI Keizo, FUKAO Yoshinori, TOYODA Akihisa, UKAI Mifuyu, WATANABE Hiroaki, and YAMAGA Takumi)
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Science thrives on both curiosity and collaboration. This edition features our open house event that welcomed the public into the world of hadron research, and highlights from KAON2025, where the future of kaon physics was passionately discussed.
The J-PARC Open House was held on August 23, 2025, and approximately 300 visitors came to the Hadron Experimental Facility. At the Hadron Experimental Facility, various exhibits and activities were offered, including displays of the secondary particle production target, a model of the primary beamline, beam optics toys, an introduction to hadron experiments, and an overview of the COMET experimental facility. These attractions were well received by the visitors.
Secondary-particle production targets at the Hadron Experimental Facility were exhibited. Notably, a real-size developing model of a new rotating-disk target aimed at 150kW was displayed. Additionally, visitors could experience some key technologies for the target, such as gas bearing. A 1/100 scale model of beam line devices and radiation shielding at the Hadron Experimental Facility was made using plastic and Styrofoam blocks, respectively. Beam optics--the transport of a beam using magnets that focus and bend it--is demonstrated with lasers and lenses. Visitors looked through a microscope at a nuclear emulsion plate that had been irradiated with a beam, and observed the tracks produced by nuclear reactions. The Pion Capture Solenoid is the largest experimental device of COMET and was displayed for the first time this year. Visitors were also amazed to be able to actually touch 20-micron thick straw tubes and 12.5-micron thin wires of the straw tube trackers.
Studies on the properties of K mesons, called kaon physics, have played and are playing an important role in high-energy particle physics. The KOTO experiment at the Hadron Experimental Facility in J-PARC, which searches for the CP-violating rare decay of a long-lived neutral kaon, is an ongoing experiment with world-leading sensitivity. While KOTO continues to accumulate data for several years, a next-generation experiment, called KOTO II, which can change the phase of the research from discovery to precise measurement, is being discussed.
On September 8-12, the 13th edition of the International Conference on Kaon Physics (Kaon2025) was held at Johannes Gutenberg University Mainz in Germany (https://indico.cern.ch/event/1485702/overview). Approximately 90 kaon physicists attended the conference in person and discussed the present and future of kaon physics from both theoretical and experimental aspects. Reports from KOTO, as well as those from the CERN NA62 experiment in Europe, provided information to understand the current and near-future prospects. KOTO II at J-PARC has become the central subject to be discussed as a unique opportunity worldwide in the next decade.
Following the conference, a two-day workshop was held at the same place on September 13-14, devoted to a discussion on KOTO II. Approximately 40 experimental researchers participated and engaged in active discussions.
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STATUS OF THE COMET EXPERIMENT (by MIHARA Satoshi)
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The COMET experiment aims to search for the lepton-flavor-violating muon reaction, mu-e conversion, with a sensitivity better than 10-14 in Phase I.
The COMET group has started installation work of the detector solenoid (DS) along with the beige solenoid (BS), connecting the transfer solenoid (TS) and DS. The work will be completed in 2025, followed by an excitation test of BS and DS.
Another critical component is the shielding blocks designed to protect the capture solenoid (CS) superconducting coils from radiation. Four such blocks were fabricated in Japan in JFY2024. Construction of an additional eight blocks is being prepared in IHEP and JINR as in-kind contribution.
Recently, an article describing the performance of the detector used in the COMET engineering run, COMET Phase-alpha, was published. The Physics paper of phase-alpha is now in preparation. The collaboration will continue to actively disseminate information regarding COMET's progress and activities.
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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. Preparations for muon cooling and acceleration at the H2 area are underway. Experiments are planned this winter. Design of the H-line experimental building for the installation of the remaining parts of the muon LINAC and the storage ring was refined to reduce the construction cost. The collaboration meeting was held from June 25-27 at J-PARC. The University of Liverpool joined the collaboration.
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4. [Materials and Life Science Division]
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NEUTRON SOURCE; ONGOING MAINTENANCE WORKS DURING THE LONG OUTAGE ( by HARADA Masahide )
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The beam operation of MLF ended on May 16th due to a water detection trouble in the Helium Vessel, so the annual long outage for maintenance work started about one month earlier than originally scheduled. It was found that the trouble was caused by a water leak from the target vessel, and a root cause investigation is going on by structural analysis and mock-up tests. On July 11th and 16th, the two used mercury target vessels were transported from MLF to the storage building(the so-called RAM building), where a total of 9 used target vessels are now stored.
On July 28th, the used mercury target vessel was replaced with a new one without cutting out specimens. Preparations to replace the proton beam window, moderators, and a reflector with new ones are underway from July to September. The actual replacement work is scheduled for FY2026 summer. As a decrease in the insulation resistance of the mercury pump power cables was found during a recent electrical inspection, the replacement of the cables is planned for the end of September. Additionally, the annual inspection of the cryogenic circulation system is underway, and mechanical maintenance work of the power manipulator is scheduled for October.
The maintenance work during the long outage is proceeding as scheduled.
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NEUTRON INSTRUMENT AND SCIENCE; APPROVED PROPOSALS FOR THE 2025B ROUND AND SUMMER STUDENT INTERNS ( by NAKAMURA Mitsutaka )
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This summer, the MLF Advisory Board convened to review and approve proposals for the 2025B round. For neutron use, 78 applications have won their opportunities at MLF out of 99. The 2025B round was somewhat irregular due to issues with the neutron target that affected both the 2024B and 2025A periods. Since only 17 days were allocated for the round, we decided to accept only domestic proposals to avoid excessive competition. Final selections were confirmed at the end of August.
Several summer student interns were accepted as part of MLF's educational activities. Three of them participated in the program "Practical Training in Crystal Structure Analysis Using Neutron Single-crystal Diffraction," and another two were in "Practical Training in Analysis of Energy-dispersive Neutron Imaging Experiments."
Recent press release from Neutron Science at MLF:
BL03 iBIX on Jul. 15th
"Neutron and time-resolved X-ray crystallography reveal the substrate recognition and catalytic mechanism of human Nudix hydrolase MTH1"
https://doi.org/10.1073/pnas.2510085122
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MUON SCIENCE FACILITY(MUSE);RESEARCH RESULTS PRESENTATION MEETING WAS HELD ( by KAWAMURA Naritoshi )
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The proposals for the next beam cycle, 2025B, were reviewed by the Muon Science Proposal Review Committee (MSPRC). All 17 proposals were reviewed, resulting in 9 being accepted and 8 being reserved. The Institute of Materials Structure Science（IMSS）Muon-PAC also accepted a new S1-type proposal as the 2nd stage approval, a new S1-type proposal as the 1st stage approval, a new S2-type proposal, and the project use for the nondestructive elemental analysis of historical and cultural heritage. The accepted proposals will mainly be assigned in February and March 2026. The operational dates would be shorter than usual due to problems with the facility, and carry-over programs from 2024B and 2025A will be performed with higher priority in the beam cycle starting in October.
The Research Results Presentation Meeting of J-PARC/Muse (https://kds.kek.jp/event/56050/) was held from September 2 to 5 in Nasu, Tochigi, with approximately 100 participants. The users and staff were stuck in a hotel to focus on the discussion, and a deep understanding of muon science could be achieved. Additionally, this style can promote mutual understanding between users and staff from different research fields. Subsequently, the workshop dedicated to the science of negative muons was held at the same venue.
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USERS GATHER IN TOKYO FOR MLF ROADMAP WORKSHOP (by NAKAMURA Mitsutaka & KAWAMURA Naritoshi)
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MLF has initiated discussions on the future development plan for the next decade, including the major new concept of a Second Target Station (TS2). To communicate with users of MLF neutron and muon facilities, the 1st MLF Roadmap Workshop was held on August 26th. The workshop featured new ideas for a new target system, particularly from the facility side, including future development plans for MLF and the expected performance of TS2. From the user community, proposals focused on materials science research under extreme sample environments such as ultra-high pressure and strong magnetic fields. Proposals in various fields of science are also introduced to be realized in the TS2.
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5. [Nuclear Transmutation Division] by MEIGO Shin-ichiro
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MEASUREMENTS OF DISPLACEMENT CROSS-SECTION FOR 440 GEV PROTONS
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Displacement per atom (dpa) is a damage index for materials, which is estimated by displacement cross section and particle flux. It is widely applied not only to the accelerator facilities but also to the fusion and fission reactors. Nevertheless, the displacement cross section for a proton in the kinematic energy range above 20 MeV had not been measured. For the accurate damage estimation of structural material, such as the beam window and the target of high-energy accelerator facilities, including J-PARC and accelerator driven nuclear transmutation systems (ADS), we have measured the displacement cross sections of the metals irradiated by protons in the kinetic energy range from 100 MeV to 120 GeV. To extend the high-energy region of the experimental data, measurements using 440-GeV protons were conducted at HiRadMat in the European Organization for Nuclear Research (CERN).
The displacement cross-section can be obtained from the electronic resistivity change of the sample due to the irradiation of protons at cryogenic temperatures. For the experiment with minimized radioactive material, we borrowed the vacuum chamber with the cryocooler, which was already used for another experiment regarding the safety of superconducting magnets by the CERN TE-MPS group. With the devoted support of CERN's groups, the experimental cross sections were successfully obtained. In comparison with the calculation, the present experiment data supported the previous experimental results below 120 GeV, which showed an overestimation of the calculation based on the ordinal dpa model of Norgett−Robinson−Torrens (NRT-dpa). On the contrary, the calculation with the latest dpa model of athermal recombination corrected (arc-dpa) showed good agreement with the preliminary present data.
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6. [Outreach Activities]
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★ Exhibited at Eco-Fes Hitachi 2025 (June 28, Hitachi Civic Center and other venues)
J-PARC's Cryogenics Section showcased magnetic and superconducting demonstrations at Eco-Fes Hitachi 2025, drawing 337 visitors. Guests were captivated by the magnetic slide and a −200&℃ superconducting coaster gliding along magnetic rails.
https://www.j-parc.jp/c/en/topics/2025/08/07001603.html
★ Muographic Investigation of Ancient Burial Mounds in Tokai: Visiting the Torazuka Kofun and the Jugoro Hole Cave Tombs (June 29, Hitachinaka City)
Under clear skies, 44 participants joined the second Muographic Investigation of Ancient Burial Mounds in Tokai, exploring the Torazuka Kofun and Jugoro Hole Cave Tombs. Talks by experts deepened interest in the stone chamber structures and mural replicas, sparking many questions and excitement about the muography results.
https://www.j-parc.jp/c/en/topics/2025/08/07001603.html
★ Visiting Lecture at Yunago Elementary School, Hitachi City (July 8)
Dr. MIHARA Satoshi gave a lecture titled "What is the Universe Made of? - Light" at Yunago Elementary School, engaging 34 students and guardians in exploring light through waves and quanta. Participants enjoyed making kaleidoscopes and shared enthusiastic feedback about the hands-on learning experience.
https://www.j-parc.jp/c/en/topics/2025/08/07001603.html
★ Participation in the "Energy Workshop" (July 12, AEON TOKAI)
J-PARC participated in the "Energy Workshop" celebrating Tokai Village's 70th anniversary, engaging children with a maze inspired by its accelerators and showcasing a scale model of the facility. Visitors enjoyed hands-on energy activities and expressed excitement about the upcoming open house.
https://www.j-parc.jp/c/en/topics/2025/08/07001603.html
★ Science Seminar at Geo Space Adventure (GSA 2025) (July 26)
Geo Space Adventure in Hida City offered participants a rare chance to visit world-class underground research sites like Super-Kamiokande and KamLAND. Dr. HINO Yota's seminar on J-PARC's neutrino beam drew strong interest, with attendees asking insightful questions about neutrino science and future experiments.
https://www.j-parc.jp/c/en/topics/2025/09/25001617.html
★ Muographic Investigation of Ancient Burial Mounds in Tokai: Creating a Diorama of Funatsuka No. 2 Burial Mound(July 27)
On the first weekend of summer break, 14 students joined the third Muographic Investigation session in Tokai, building a 1/100-scale diorama of the Funatsuka No. 2 burial mound and exploring detector placement. The completed diorama was later exhibited at the J-PARC Open House in August.
https://www.j-parc.jp/c/en/topics/2025/09/25001617.html
★ Tokai Village Enjoy Summer School 2025 (July 29-30 and August 2)
This year's J-PARC Hello Science Summer Workshop engaged elementary students with hands-on experiments, including a new activity on snow crystal formation and high-pressure ice. Participants were amazed to learn that ice can form under pressure without lowering the temperature.
https://www.j-parc.jp/c/en/topics/2025/09/25001617.html
★ Children's Kasumigaseki Open Days "Let's Make a Kaleidoscope of Light" (August 6-7)
At the "Children's Kasumigaseki Open Days," kids learned about J-PARC at the Japan Atomic Energy Agency booth and made kaleidoscopes that sparkled with rainbow light. One child even wrote "J-PARC" on their hand to remember the experience, showing how much it resonated with them.
https://www.j-parc.jp/c/en/topics/2025/09/25001617.html
★ J-PARC & Nuclear Science Research Institute Open House 2025 - Exploring Tomorrow's World Through Science - (August 23)
The 2025 J-PARC & Nuclear Science Research Institute Open House welcomed 1,648 visitors despite the summer heat. Guests enjoyed facility tours, hands-on activities, and a special MLF exhibition, "Ancient Knowledge and Modern Knowledge -- Japanese Sword X MLF X Automobile." Thank you for your feedback--we look forward to seeing you next year!
https://j-parc.jp/c/en/topics/2025/10/09001621.html
★ Visiting Lecture at Nakamachi Elementary School, Hitachi-City (September 9)
A science class for 27 third- and fourth graders explored the nature of waves and light, led by Mr. ITABA Tatsunori and Dr. SAWADA Shinya. After learning about light's properties, the children made kaleidoscopes and marveled at the rainbow colors they created.
https://j-parc.jp/c/en/topics/2025/10/09001621.html
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7. [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
┃ AIZAWA Kyoko: akyouko[at]post.j-parc.jp
┃ Bruce YEE-RENDON: byee[at]post.j-parc.jp
┃ SEKI Eiko (Secretary) : seki.eiko[at]jaea.go.jp
┃ * Please replace "(at)" with "@" when you enter an email address.
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