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Journal Articles

Present status of the JAEA-AMS-TONO (2023FY)

Fujita, Natsuko; Miyake, Masayasu; Matsubara, Akihiro*; Ishii, Masahiro*; Jinno, Satoshi; Watanabe, Takahiro; Nishio, Tomohiro*; Ogawa, Yumi; Omae, Akiomi*; Kimura, Kenji; et al.

Dai-36-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.90 - 92, 2025/03

The JAEA-AMS-TONO facility at the Tono Geoscience Center, JAEA has three accelerator mass spectrometers. We report the present status of the JAEA-AMS-TONO.

Journal Articles

Present status of the JAEA-AMS-TONO (2023); Primarily on the cause of the varistor damage

Matsubara, Akihiro*; Fujita, Natsuko; Miyake, Masayasu; Ishii, Masahiro*; Omae, Akiomi*; Maeta, Yusuke; Uno, Sadanori*

Dai-36-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.125 - 129, 2025/03

We will report on the maintenance and management of JAEA-AMS-TONO-5MV (NEC 15SDH-2, maximum terminal voltage 5.0 MV) located at the Toki Geochronology Research Institute, Tono Geoscience Center, Japan Atomic Energy Agency; (1) Regarding damage to varistors in beamline equipment and its causes, (2) Phenomena that suggest a vacuum leak in the accelerator tube of a tandem accelerator and its countermeasures.

Journal Articles

Overview of the J-PARC accelerator

Oguri, Hidetomo

Kasokuki, 21(4), p.279 - 287, 2025/01

Journal Articles

Report on the 21st Annual Meeting of Particle Accelerator Society of Japan

Iwai, Takeo*; Tokanai, Fuyuki*; Soda, Hikaru*; Harada, Hiroyuki

Kasokuki, 21(4), p.381 - 386, 2025/01

no abstracts in English

Journal Articles

J-PARC proton beam irradiation facility plan

Meigo, Shinichiro

Kasokuki, 21(4), p.333 - 344, 2025/01

For the study of material damage under the beam irradiation circumstance of accelerator-driven systems (ADS), the JAEA had planned to construct a TEF-T using J-PARC Linac 400-MeV proton beams and the LBE spallation target. The task force for evaluating partitioning and transmutation technology in the MEXT recommended that the facility be considered to maximize the advantages of using Linac to meet users' various needs. The proton irradiation facility, a successor of TEF-T, is planned to be constructed for 1) Material irradiation examinations, 2) Semiconductor soft-error examinations using spallation neutrons, 3) Medical RI production, and 4) Proton beam applications for space use. A user community was established in 2022 to incorporate user input as a more attractive facility. In this paper, the present design status of the facility is described.

Journal Articles

Operation status of J-PARC H$$^-$$ ion source

Shibata, Takanori*; Okoshi, Kiyonori; Ueno, Akira; Ikegami, Kiyoshi*; Shinto, Katsuhiro; Nammo, Kesao*; Kawai, Isao*; Oguri, Hidetomo

Kasokuki, 21(2), p.94 - 100, 2024/07

In the recent J-PARC user operation from Nov. 10th, 2022 to Jun. 22nd, 2023, continuous operation of 4,412 hours with hydrogen negative ion (H$$^-$$ ion) beam current up to 60 mA was achieved by J-PARC radio frequency (RF) H$$^-$$ ion source. This was also the first time to supply H$$^-$$ ion beam to the linac in the yearly J-PARC user operation term by a single ion source (w/o ion source exchange). To satisfy the requirements of the further upgrade in J-PARC, a soundness evaluation of the present ion source components has been performed. Furthermore, the RF ion source with a newly manufactured RF antenna coil has been under development.

Journal Articles

Present status of the JAEA-AMS-TONO (2022FY)

Fujita, Natsuko; Miyake, Masayasu; Matsubara, Akihiro*; Ishii, Masahiro*; Watanabe, Takahiro; Jinno, Satoshi; Nishio, Tomohiro*; Ogawa, Yumi; Kimura, Kenji; Shimada, Akiomi; et al.

Dai-35-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.17 - 19, 2024/03

The JAEA-AMS-TONO facility at the Tono Geoscience Center, JAEA has three accelerator mass spectrometers. We report the present status of the JAEA-AMS-TONO.

Journal Articles

Commitment to sustainable Particle Accelerator Society of Japan; First roundtable meeting for communication with students and companies/research institutions

Harada, Hiroyuki; Sakaue, Kazuyuki*; Otani, Masashi*; Soda, Hikaru*

Kasokuki, 20(4), p.332 - 335, 2024/01

In Japan, where the birthrate is declining, securing young people to lead the next generation is an important issue for all organisations. The Particle Accelerator Society of Japan has nearly 1,000 members with increasing up to now, but it is necessary to take measures for the future. Therefore, the Events Committee and the Activation Committee of the Society jointly organised "First Roundtable meeting for communication with students and companies/research institutions". The aim of this meeting was to increase opportunities to connect students and companies/research institutions, to help students resolve their concerns about the future through job, and to help secure human resources for community. This paper reports on this meeting and its future as a new initiative towards the sustainable academic society.

Journal Articles

Present status of the JAEA-AMS-TONO (2019-2020)

Fujita, Natsuko; Matsubara, Akihiro; Miyake, Masayasu*; Watanabe, Takahiro; Kokubu, Yoko; Nishio, Tomohiro*; Ogawa, Yumi*; Kato, Motohisa*; Shimada, Akiomi; Ogata, Nobuhisa

Dai-33-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, P. 48, 2022/04

no abstracts in English

Journal Articles

Spallation neutron source target at J-PARC

Haga, Katsuhiro

Kasokuki, 18(4), p.210 - 216, 2022/01

The pulsed spallation neutron source driven by a high-power accelerator is one of the most powerful apparatus to provide high intensity and high quality neutrons with narrow pulse width for conducting cutting-edge researches in several domains of materials and life science. In this system, proton beams of several kW to MW order extracted from the high power accelerator is injected into a target, which is heavy metal, to generate vast amount of neutrons via the spallation reactions with the target nuclei, and slows down these neutrons to thermal to cold neutrons with a moderator and a reflector. Resultant neutron beams are then supplied to a suit of the state-of-the-art experimental devices. In this paper, mechanism to produce neutron beams and outline of the spallation neutron source, engineering design of a target system such as a mercury target, and technical topics to solve the pitting damage problem of the target vessel which is caused by the pressure wave of up to 40MPa at maximum generated in the mercury by the pulsed proton beam injection are reviewed by referring mainly to the mercury target system of the pulsed spallation neutron source at J-PARC.

Journal Articles

Lead bismuth target for Accelerator-driven Transmutation System (ADS)

Sasa, Toshinobu

Kasokuki, 18(4), p.233 - 240, 2022/01

Lead bismuth eutectic alloy (LBE) is a promising option as a spallation target for accelerator-driven transmutation systems (ADS) to reduce the radiological toxicity from long-lived radioactive waste. LBE is a heavy metal and has suitable characteristics both as a spallation target and as a coolant for transmutation systems. However, LBE is also known as a highly corrosive with structural materials. In this paper, technological developments to overcome the issue, the latest research activities such as hightemperature operation and oxygen concentration control to ensure corrosion resistance, are introduced together with the outline of the target for ADS.

Journal Articles

Deployment of the next-generation LLRF control system for the J-PARC RCS

Tamura, Fumihiko

Kasokuki, 18(3), p.151 - 160, 2021/10

The LLRF control system for the J-PARC RCS plays an important role in acceleration of high intensity beams. The original system had been working well without significant problems for more than a decade, however, the long term maintenance became difficult due to the obsolesce of the old FPGAs in the system. Therefore we developed and deployed the next-generation LLRF control system. The next-generation system is based on the modern platform, MTCA.4. The most important new function of the system is the multiharmonic vector rf voltage control feedback, which compensate the heavy beam loading in the wideband cavity better than the feedforward at the beam intensity of the design beam power, 1MW. The commissioning results are reported. The next-generation system has been successfully deployed.

Journal Articles

1st Workshop against proposal by Young Researchers Association of the Japan Beam Physics Club "Discussing and Brainstorming for the World of Beam Physics in the thirty years ahead"

Sakaue, Kazuyuki*; Harada, Hiroyuki

Kasokuki, 16(3), p.204 - 206, 2019/10

Beam is used for research base of wide disciplines and contributes to science technology, and is supported by beam physics. Young Researchers Association of the Japan Beam Physics Club was established to lead to contribution for science technology by communication among young researchers at April 2018. Our club was newly established the workshop against proposal and the 1st workshop of "Discussing and Brainstorming for the World of Beam Physics in the thirty years ahead" was holed at Kyoto on July 30th 2019. This paper will report the 1st workshop.

Journal Articles

Present status of the accelerator facility at the JAEA-AMS-TONO (2018)

Fujita, Natsuko; Matsubara, Akihiro; Miyake, Masayasu*; Watanabe, Takahiro; Kokubu, Yoko; Kato, Motohisa*; Okabe, Nobuaki*; Isozaki, Nobuhiro*; Ishizaka, Chika*; Torazawa, Hitoshi*; et al.

Dai-32-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.57 - 59, 2019/09

no abstracts in English

Journal Articles

Beam dynamics study for beam loss mitigation in the J-PARC RCS

Hotchi, Hideaki; Harada, Hiroyuki; Okabe, Kota; Saha, P. K.; Shobuda, Yoshihiro; Tamura, Fumihiko; Yoshimoto, Masahiro

Kasokuki, 16(2), p.109 - 118, 2019/07

no abstracts in English

Journal Articles

Present status of the accelerator facility at the JAEA-AMS-TONO; 2017

Fujita, Natsuko; Miyake, Masayasu; Watanabe, Takahiro; Kokubu, Yoko; Matsubara, Akihiro*; Kato, Motohisa*; Okabe, Nobuaki; Isozaki, Nobuhiro*; Ishizaka, Chika*; Torazawa, Hitoshi*; et al.

Dai-31-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.92 - 95, 2018/12

no abstracts in English

Journal Articles

Present status of development of isobar separation using ion channeling

Matsubara, Akihiro*; Fujita, Natsuko; Miyake, Masayasu; Isozaki, Nobuhiro*

Dai-31-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.108 - 111, 2018/12

no abstracts in English

Journal Articles

Young Researchers Association of the Japan Beam Physics Club

Harada, Hiroyuki; Sakaue, Kazuyuki*

Kasokuki, 15(3), p.143 - 150, 2018/10

Recently, many scientific communities and associations in Japan establish young division for young scientists and students. Young Researchers Association of the Japan Beam Physics Club was established in March 2018 by young scientists who research the beam physics as basic research for particle acceleration and laser. We will report a detail history and trigger of the establishment of our association, followed by the explanations of ourselves, which are the structure of our organization, members, activities and purposes. Lastly, we will discuss our future vision of Young Researchers Association of the Japan Beam Physics Club.

Journal Articles

Accelerator Driven nuclear transmutation System (ADS)

Maekawa, Fujio

Koenerugi Kasokuki Semina, OHO '18 Jukoyo Tekisuto, 11 Pages, 2018/09

no abstracts in English

Journal Articles

Neutron source

Takada, Hiroshi

Kasokuki Handobukku, p.330 - 333, 2018/04

Spallation neutron source provides thermal and cold neutrons for materials researches. Those neutrons are obtained by slowing down the neutrons generated in a neutron production target by injecting high energy protons in surrounding reflector and moderators. This article introduces basic characteristics of the neutron production target at first, and then explains the characteristics of moderator, especially the design to generate high intensity and high quality neutron pulses with narrow width in the moderators used in the 1-MW spallation neutron source at J-PARC. Furthermore, the design procedure of the spallation neutron source is described.

181 (Records 1-20 displayed on this page)