Journal Article

Beam commissioning and operation of the J-PARC main ring synchrotron

Tadashi Koseki, Yoshitugu Arakaki, Yong Ho Chin, Keigo Hara, Katsushi Hasegawa, Yoshinori Hashimoto, Yoichiro Hori, Susumu Igarashi, Koji Ishii, Norihiko Kamikubota, Takuro Kimura, Kunio Koseki, Kuanjyun Fan, Chikashi Kubota, Yuu Kuniyasu, Yoshinori Kurimoto, Seishu Lee, Hiroshi Matsumoto, Alexander Molodozhentsev, Yuichi Morita, Shigeru Murasugi, Ryotaro Muto, Fujio Naito, Hidetoshi Nakagawa, Shu Nakamura, Kazuaki Niki, Kazuhito Ohmi, Chihiro Ohmori, Masashi Okada, Katsuya Okamura, Takao Oogoe, Kazufumi Ooya, Kenichi Sato, Yoichi Sato, Yoshihiro Sato, Kenichirou Satou, Masayuki Shimamoto, Masashi Shirakata, Hirohiko Someya, Takuya Sugimoto, Junpei Takano, Yasuhiro Takeda, Yoichi Takiyama, Masaki Tejima, Makoto Toda, Masahito Tomizawa, Takeshi Toyama, Masahiko Uota, Shuei Yamada, Noboru Yamamoto, Eiichi Yanaoka, Masahito Yoshii, Hiroyuki Harada, Shuichiro Hatakeyama, Hideaki Hotchi, Masahiro Nomura, Alexander Schnase, Taihei Shimada, Fumihiko Tamura, Masanobu Yamamoto and Tetsushi Shimogawa

in Progress of Theoretical and Experimental Physics

Published on behalf of The Physical Society of Japan

Volume 2012, issue 1 Published in print January 2012 |
Published online December 2012 | e-ISSN: 2050-3911 | DOI: https://dx.doi.org/10.1093/ptep/pts071

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The slow cycling main ring synchrotron (MR) is located the furthest downstream in the J-PARC accelerator cascade. It became available for user operation in 2009 and provides high-intensity 30 GeV proton beams for various experiments on particle and nuclear physics. The MR has two beam extraction systems: a fast extraction system for beam delivery to the neutrino beam line of the Tokai-to-Kamioka (T2K) experiment and a slow extraction system for beam delivery to the hadron experimental hall. After a nine-month beam shutdown during the recovery from the Great East Japan Earthquake, the J-PARC facility resumed beam operation in December 2011. The MR delivers a 160–200 kW beam to the T2K experiment and a 3.5–6 kW beam to users in the hadron experimental hall. In this paper, a brief review of the MR and the recent status of beam operation are presented. Near-future plans for a beam intensity upgrade are also discussed.

Journal Article.  6121 words.  Illustrated.

Subjects: Physics

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