J-PARC Project Newsletter No.99, July 2025 dispatch
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J-PARC Project Newsletter
No.99, July 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]
- OPERATION STATUS
- SIGNING OF MoU WITH HITOTSUBASHI UNIVERSITY TO PROMOTE INTERDISCIPLINARY RESEARCH
- KEK HOSTS TOUR OF SOKENDAI JOINT RESEARCH CENTER/ J-PARC EXPERIMENTAL EQUIPMENT DEVELOPMENT BUILDING
- J-PARC AND KEK HOST PRESS TOUR SHOWCASING ADVANCED HYPER-KAMIOKANDE PROJECT
2. [Accelerator Division]
ACCELERATOR OPERATION STATUS
MR. SHOTA NAGAYAMA RECEIVED THE YOUNG PRESENTATION AWARD
3. [Particle and Nuclear Physics Division]
- OPERATIONAL STATUS OF THE NEUTRINO BEAMLINE AND COMPLETION OF THE HYPER KAMIOKANDE CAVITY EXCAVATION
- STATUS OF THE JSNS2 / JSNS2-II (SEARCH FOR STERILE NEUTRINOS AT J-PARC MLF, E56 / E82)
- SUCCESSFUL COMPLETION OF THE FIRST HALF OF 2025 OPERATION OF THE HADRON EXPERIMENTAL FACILITY WITH A NEW RECORD OF 92 KW BEAM POWER
- STATUS OF THE COMET EXPERIMENT
- STATUS OF THE MUON g-2/ ELECTRIC DIPOLE MOMENT (EDM) (E34)
4. [Materials and Life Science Division]
- THE SEALING PERFORMANCE OF THE MERCURY PIPING WAS SUCCESSFULLY RECOVERED. THEN A WATER LEAKAGE TROUBLE OCCURRED
- 2025A NEUTRON USER PROGRAM HALTED; RESTART SCHEDULED FOR FALL 2025
- HIGH SCHOOL STUDENTS CONDUCTED AN EXPERIMENT
5. [Nuclear Transmutation Division]
ENHANCING THE COLLABORATION WITH THE BELGIAN NUCLEAR RESEARCH CENTRE IN THE FIELD OF SUPERCONDUCTING LINAC DEVELOPMENT FOR ADS
6. [Safety Division]
AN EMERGENCY DRILL WAS HELD ASSUMING A FIRE ACCIDENT
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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OPERATION STATUS
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As described in the MLF and PN sections, we had problems in the liq. Mercury target of MLF and in the Helium gas system for the graphite target cooling of the Neutrino Facility; the beam operation had to be stopped unexpectedly. We once again deeply apologize for any inconvenience and troubles given to all users. Details will be described in each corresponding section.
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SIGNING OF MoU WITH HITOTSUBASHI UNIVERSITY TO PROMOTE INTERDISCIPLINARY RESEARCH
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On April 22, 2025, J-PARC signed a Memorandum of Understanding (MoU) with Hitotsubashi University in Tokyo to strengthen the collaboration between natural sciences and social sciences. This agreement aims to promote research and development at J-PARC and university education at Hitotsubashi University by utilizing each other's resources, based on data science.
The MoU marks a significant step toward expanding J-PARC's impact beyond traditional scientific domains.
https://j-parc.jp/c/press-release/2025/04/22001504.html (in Japanese)
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KEK HOSTS TOUR OF SOKENDAI JOINT RESEARCH CENTER/J-PARC EXPERIMENTAL EQUIPMENT DEVELOPMENT BUILDING
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On June 2, 2025, KEK's Tokai Campus welcomed President Prof. Nagata and Vice President Prof. Yamamoto from SOKENDAI (The Graduate University for Advanced Studies) for a guided tour of the newly completed SOKENDAI Joint Research Center / J PARC Experimental Equipment Development Building inaugurated in March 2025. The event, held with graduate students and staff members of SOKENDAI in Tokai, showcased the advanced development infrastructure supporting J-PARC experiments, reinforcing the partnership between the two institutions.
https://www.kek.jp/ja/topics/202506181700sokendai (in Japanese)
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J-PARC AND KEK HOST PRESS TOUR SHOWCASING ADVANCED HYPER-KAMIOKANDE PROJECT
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On May 27, 2025, J PARC and KEK jointly invited media representatives to a guided tour and briefing highlighting the remarkable progress in the Hyper Kamiokande project. Some 30 reporters from media participated. The tour first visited the historical relics of the K2K experiment at the KEK Tsukuba campus, then moved to the Tokai-site, and visited the T2K long-baseline neutrino experiment at J-PARC in Tokai and toured to the construction site of the intermediate water Cherenkov detector for the Hyper Kamiokande project.
The tour drew significant attention from national press outlets across Japan, underscoring widespread interest in the next-generation neutrino experiment designed to enhance the sensitivity and reach of current research.
https://news.yahoo.co.jp/articles/5ce3145fd97b1490ed9aeb34a903bc6f0d43c52a (Ibaraki Shinbun for example, in Japanese)
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2. [Accelerator Division] by YAMAMOTO Kazami
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ACCELERATOR OPERATION STATUS
MR. SHOTA NAGAYAMA RECEIVED THE YOUNG PRESENTATION AWARD
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In the end of March 2025, user operations of MLF and neutrino had been canceled due to targets troubles, and the accelerators had to be stopped. The inspection of the neutrino target has been continuing and the neutrino user operation until summer was canceled. Since the repair of the MLF neutron target had been completed by the beginning of April, the accelerator commissioning started on April 4th and user operation of MLF was resumed on April 15th. However, another trouble of abnormal moisture in the target room occurred. To investigate the cause, the MLF user operation was canceled until summer.
In contrast, the hadron user operation continued stably and the scheduled experiments were completed as planned. The Main Ring (MR) commissioning proceeded smoothly, and MR demonstrated beam power of 100 kW for the slow extraction and 950 kW for the fast extraction, respectively.
We are pleased to announce that Mr. NAGAYAMA Shota, a research fellowship of Accelerator Section Ⅲ, received the Young Presentation Award from the Beam Physics Research Society/Young Researchers' Association for his presentation entitled "Development of a non-destructive electrostatic septum for slow extraction in the high-intensity proton accelerator". He developed a new electrode structure to obtain the suitable electric field distribution. He also confirmed the reduction in beam loss through simulations by using the optimized electric field. The research and development of this non-destructive electrostatic septum, which leads to improved maintainability and higher beam intensity, has been highly praised by various scientific societies.
https://j-parc.jp/c/en/topics/2025/05/13001510.html
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3. [Particle and Nuclear Physics Division]
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OPERATIONAL STATUS OF THE NEUTRINO BEAMLINE AND COMPLETION OF THE HYPER-KAMIOKANDE CAVITY EXCAVATION (by ISHIDA Taku)
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The neutrino beamline resumed operation at 830 kW at the end of February but was interrupted in early March due to a pressure drop in the helium cooling system of the target. To investigate the cause, the helium vessel at the target station was opened, and in early May, a helium gas leak was confirmed around the helium plumbing near the target. For further detailed investigation, the target and electromagnetic horn-1, to which the affected component is attached, were transferred to the maintenance area by remote operation at the beginning of June. Work is currently underway to identify the cause of the leak. The schedule for resuming beam operation will be determined based on the investigation results.
Meanwhile, in the Hyper-Kamiokande project-which aims to verify matter-antimatter symmetry breaking by detecting neutrino beams from J-PARC-the excavation of the underground cavity for the giant detector under construction at the Kamioka mine in Gifu Prefecture has finally entered its final stage, having begun in 2021. The massive space, with a diameter of 69 meters and a height of 94 meters, is expected to be completed soon. At the end of June, a site visit was held for residents of Hida City and members of the general public from across Japan.
On 16 June, a press tour was held at J-PARC showcasing the construction of the Hyper-Kamiokande project. The tour included an overview of plans to increase the beam power to 1.3 MW and a visit to the construction site of the new intermediate water Cherenkov detector (IWCD). The remains of the K2K experiment at the KEK's Tsukuba campus were also featured -This is where the world's first long-baseline neutrino oscillation experiment was conducted, laying the foundation for Hyper-Kamiokande-.
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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.
Due to issues with the mercury target system at MLF, no data were taken during this physics run by either the near detector, which is located on the third floor of MLF, or the far detector located outside the MLF building.
Meanwhile, we prepare for unblinding the signal region data taken in 2022, incorporating neutron background reduction techniques. The results are expected to be published by this fall. The new far detector is currently in the commissioning phase. 160 FADC channels are being used to record data from cosmic rays.
We anticipate to begin the data taking with both near and far detectors, when the beam for the next physics run starts in October 2025.
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SUCCESSFUL COMPLETION OF THE FIRST HALF OF 2025 OPERATION OF THE HADRON EXPERIMENTAL FACILITY WITH A NEW RECORD OF 92 KW BEAM POWER
(by TAKAHASHI Hitoshi, TAKAHASHI Toshiyuki, and NOMURA Tadashi)
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The beam operation of the Hadron Experimental Facility was carried out from April 21 to May 18. During this beam time, the power of the primary proton beam was increased to 92 kW. Thanks to the power upgrade and the stable operation of the accelerators, the accumulated beam power reached 115% of the plan.
In this beam period, several experiments were conducted. At the K1.8 beam line, spectroscopy of Xi-hypernucleus and Xi-Atom finished data-taking. In the experiment, the 12-Xi-Be hypernuclear spectrum was measured by the missing mass of 12-C(K-,K+) reaction using scintillation fiber target. The momenta of the beam K- and outgoing K+ were precisely measured with a beam spectrometer and a new spectrometer, S-2S, respectively. With the same setup, Xi- production and stopping in the scintillation fiber were identified. Such Xi- then captured by a carbon nucleus, forming a Xi- Carbon atom. Transition X-rays were measured with Ge detectors surrounding the scintillation fiber target. Measured nuclear level structure and Xi- atomic level shift gives us information on Xi-nucleus and/or -nucleon strong interaction. In addition, beam line tuning for future experiments, especially anti-deuteron beam yield measurement, was carried out.
At the K1.8BR beam line, beam test was carried out for the Cherenkov counter using quartz radiator to be used in the next experiment to search for Lambda* resonance.
Moreover, the KOTO experiment, which searches for rare kaon decays, continued to accumulate data at the KL beam line.
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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 facility construction is in progress. After delivery of the capture solenoid magnet used to collect pions and transport them to the beam transport magnet, installation work and preparation for an on-site excitation is in progress.
One of the important components is a liquid helium transfer line for the capture solenoid magnet. The helium transfer line was constructed and already delivered to J-PARC. The installation of helium transfer line requires carefully controlled procedures. This process involves secure welding of the piping, connection of superconducting wires for power supply, installation of superinsulators for thermal insulation, and, finally, the integration of vacuum-insulated piping. The COMET group is currently preparing to carry out this work during the JFY2025.
Another critical component is the shielding blocks designed to protect the superconducting coils from radiation. In JFY2024, four such blocks were fabricated in Japan. An additional eight blocks are required for the operation of the capture solenoid magnet. The experimental group is currently making preparations to produce these remaining units in collaboration with IHEP and JINR.
In parallel with these preparatory efforts, the activities of the COMET experiment have been reported at several international conferences. At Muon4Future, held in Venice at the end of May, Dr. K. OISHI presented an update on the current status of the COMET experiment. 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. The surface muon beam line (H line) was extended to the H2 area where the muon cooling and the first stage of acceleration are planned. The first beam to the H2 area was successfully delivered in April 2025.
https://j-parc.jp/c/en/topics/2025/06/13001557.html The laser system for the cold muon source is under development. A diagnostics beamline for ultra-slow muon was tested in the S2 area, with a temporal muon source. A module of positron tracking detector consisting of four silicon strip sensors and readout electronics was tested in the H1 area. The progress was reviewed by the annual review committee set by KEK IPNS in April. The paper on the demonstration of muon acceleration was published in PRL
(https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.134.245001,
https://physics.aps.org/articles/v18/114 , selected as editor's suggestion).
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4. [Materials and Life Science Division]
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NEUTRON SOURCE; THE SEALING PERFORMANCE OF THE MERCURY PIPING WAS SUCCESSFULLY RECOVERED. THEN A WATER LEAKAGE TROUBLE OCCURRED. (by HARADA Masahide)
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Although the MLF beam operation started on December 9 after the long outage, the monitoring value of the radioactivity at the MLF exhaust tower showed a tendency to be higher than normal.
It was suspected that the sealing performance of the mercury pipe flanges, which were fastened during the replacement of the mercury pump, was insufficient. Therefore, we improved the remote handling method and work procedures, stopped the MLF beam operation on February 19, and successfully replaced the metal O-rings on the mercury pipe flanges. After resuming beam operation on April 7, favorable monitoring results from the MLF exhaust tower were observed, allowing the 900 kW proton beam user program to start on April 15.
Although the beam operation had remained stable since then, a water detection trouble in the Helium Vessel occurred on May 16, resulting in the beam operation being stopped for the safety reasons. Subsequent investigations via remote operation and handling confirmed water leakage from the cooling channel of the target vessel. We are currently investigating and analyzing the cause, while also preparing to replace the target vessel. Additionally, we are re-planning and executing the summer maintenance work so that operations can resume in the fall as soon as possible.
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NEUTRON INSTRUMENT AND SCIENCE ; 2025A NEUTRON USER PROGRAM HALTED; RESTART SCHEDULED FOR FALL 2025. (by NAKAMURA Mitsutaka)
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The operation of neutron beam was halted at 18:26 on May 16 due to a neutron source issue.
The user operation for the 2025A period, which began on April 15, successfully carried out several experiments; however, the scheduled experimental proposals through June 23 were either postponed or canceled. The MLF status as well as the future possible schedule were widely announced to users via Webinar meeting on May 27. The primary objective is to ensure the originally planned number of operational days for the 2025 fiscal year by bringing forward the restart of operations in the fall 2025. For the 2025B period, only domestic new proposals could be submitted. We received 98 applications for the general proposal, and 1 for the long-term proposal.
Recent press releases from Neutron Science at MLF:
BL19 TAKUMI on Apr. 1st
"Role of solute hydrogen on mechanical property enhancement in Fe-24Cr-19Ni austenitic steel: An in situ neutron diffraction study"
https://doi.org/10.1016/j.actamat.2025.120767
BL15 TAIKAN on Apr. 17th
"Confined water distribution in the ionomer within the catalyst layers of polymer electrolyte fuel cells: A small-angle neutron scattering study"
https://doi.org/10.1016/j.cej.2025.161321
BL05 NOP on Apr. 28th
"Measurement of neutron whispering gallery states using a pulsed neutron beam"
https://doi.org/10.1103/PhysRevD.111.082008
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MUON SCIENCE FACILITY (MUSE) ; HIGH SCHOOL STUDENTS CONDUCTED AN EXPERIMENT (by KAWAMURA Naritoshi)
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The operation of MUSE resumed at the beginning of April after fixing the trouble with the neutron target system. Then, the user's programs have been conducted smoothly until a malfunction on May 16 caused the operation to stop again. We are currently adjusting our work process to begin our summer maintenance work ahead of schedule and accelerate the resumption of operations in the fall.
We issued a press release regarding an experiment conducted on the D line with junior and senior high school students supported by Accel Kitchen LLC on May 5-6: https://j-parc.jp/c/press-release/2025/05/23001516.html (in Japanese). The Accel Kitchen called for proposals for experiments using muon beams from students, and three of the selected proposals were carried out as Instrumental Development Use in the D1 area. On the first day, the students toured the beamline and prepared for their experiments. On the second day, each student conducted three experiments. This was the first experiment conducted at J-PARC by high school students.
The Outstanding Support for Research Award of the Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology was awarded to Mr. S. MAKIMURA, Dr. S. MATOBA, and Mr. H. SUNAGAWA for "Contribution to the Safe and Stable Operation of the World's Most Intense Pulsed Muon Source":
https://www.kek.jp/ja/topics/202504151400 (in Japanese). The Society of Muon and Meson Science of Japan (JMMS) Society Award 2024 was awarded to Dr. W. HIGEMOTO for "Study of magnetism and superconductivity in heavy Fermion superconductor by using muSR method".
The JMMS Technology Award 2024 was awarded to Drs. N. KAWAMURA and T. YAMAZAKI for "Development of High Intensity and General-Purpose Muon Beamline (H-Line) at the J-PARC MLF Muon Experimental Facility". The JMMS Encouragement Award 2024 was awarded to Dr. T. TANIGUCHI for "Investigation of Magnetic and Electronic Properties in T*-Type Cuprate Superconductors", which was performed in the S1 area. The details of the three awards of JMMS are on the web page: http://jmeson.org/awards/winners/ (in Japanese).
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5. [Nuclear Transmutation Division] by Bruce YEE-RENDON
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ENHANCING THE COLLABORATION WITH THE BELGIAN NUCLEAR RESEARCH CENTRE IN THE FIELD OF SUPERCONDUCTING LINAC DEVELOPMENT FOR ADS
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An Accelerator-driven system (ADS) is an advantageous option that reduces radiotoxicity and the volume of nuclear waste, while also producing energy. ADS requires a high-beam power accelerator with an availability beyond the current performance. To this end, the Japan Atomic Energy Agency (JAEA) is conducting research and development on Superconducting Linear Accelerators (Linac). Superconducting Linacs for ADS have become a mutual worldwide goal. Additionally, the strategies developed for ADS Linacs are suitable for other linear accelerators, which will enhance the intensity and availability of particle accelerators.
The development of ADS accelerators requires close international collaboration between laboratories around the world. Therefore, since 2006, JAEA and the Belgian Nuclear Research Centre (SCK CEN) have collaborated on ADS-related topics. SCK CEN is currently building the Multipurpose hYbrid Research Reactor for High-tech Applications (MYRRHA), the world's first large-scale ADS. In recent years, exchange meetings and research stays have taken place between J-PARC and SCK CEN. Last May, SCK CEN hosted the Open Collaborative Meeting on Superconducting Linac Accelerators for High-Power Proton Beams (SLHiPP), focusing on topics relevant to high-intensity superconducting proton and ion Linacs currently under design, construction, and operation. SCK CEN invited us to present the latest development of a superconducting linac for ADS in J-PARC to the international community.
During the meeting, we agreed on a new collaboration in beam dynamics to study beam transients (i.e., the transition from unsteady to steady beam conditions) and fault tolerance (beam optics schemes that allow the Linac to continue operating in the event of a cavity or magnet failure). The first online meeting was held on May 28, and the next one will take place on July 2.
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6. [Safety Division] by BESSHO Kotaro and KASUGAI Yoshimi
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J-PARC SAFETY DAY 2025
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The J-PARC Center has been holding "the J-PARC Safety Day" every year around May 23rd, date when a radioactive material leak incident occurred in 2013. The Safety Day in FY2025 was held on May 23rd, and 374 staff members participated in the event through a hybrid format. In the morning session, a safety information exchange meeting in response to fire incidents in 2023 and 2024 was held. Various safety activities related to fire prevention were reported from each accelerator facility and experimental facility.
In the afternoon, a workshop session for fostering a safety culture was held. First, the Safety Contribution Award for four J-PARC staff members was presented. Following this session, the invited talk "Safety Management of In-flight Meals - Towards Reducing Invisible Risks" was given by Ms. Aki Kawano et al., Japan Airlines Co., Ltd. There, they described the need to work quickly and accurately to provide safe meals on board the aircraft and introduced specific examples on safety management.
Although the fields are quite different, there are many common points to keep in mind in order to ensure safety, and some of their challenges should be applicable to safety efforts at J-PARC. Finally, the documentary film "The Radioactive Material Leak Incident at J-PARC: Focusing on the Scientific Aspects" was screened.
J-PARC will continue this event every year in the future to ensure that all staff members place the highest priority on safety in their research activities.
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7. [Outreach Activities]
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★ The 14th Koshien of Science National Competition in Tsukuba (March 21st-24th)
https://www.j-parc.jp/c/en/topics/2025/05/13001510.html
★ Guest Lecture at National Institute of Technology, Tsuyama College (April 22nd)
★ Visiting Lecture at Koka Gakuen Junior and Senior High School (May 7th)
★ Visiting Class at Suwa Elementary School in Hitachi City (May 13th)
★ Open University of Japan - Library Lecture Series (May 17th)
★ Muographic Investigation of Ancient Burial Mounds in Tokai (April 27th)
- The second muon detector completed
★ KEK Exhibited at Niconico Chokaigi 2025 (April 26th-27th)
https://www.j-parc.jp/c/en/topics/2025/06/13001557.html
★ Junior and Senior High School Students Take on Muon Beam Experiments at J-PARC (May 5th-6th)
★ Visiting Lecture at National Institute of Technology, Oyama College (June 10th)
★ Press Tour of J-PARC and KEK Facilities (June 16th)
https://www.j-parc.jp/c/en/topics/2025/07/18001588.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
┃ SHINTO Katsuhiro: shinto.katsuhiro[at]jaea.go.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
┃ Jean-Michel POUTISSOU (English Editor) : jmp[at]triumf.ca
┃ SEKI Eiko (Secretary) : seki.eiko[at]jaea.go.jp
┃ * Please replace "(at)" with "@" when you enter an email address.
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