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Hasegawa, Kazuo; Kinsho, Michikazu; Oguri, Hidetomo; Yamamoto, Kazami; Hayashi, Naoki; Yamazaki, Yoshio; Naito, Fujio*; Hori, Yoichiro*; Yamamoto, Noboru*; Koseki, Tadashi*
Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1317 - 1321, 2017/12
After the summer shutdown in 2016, the J-PARC restarted user operation late in October for the neutrino experiments (NU) and early in November for the materials and life science experimental facility (MLF). The beam power for the NU was 420 kW in May 2016, but increased to 470 kW in February 2017 thanks to the change and optimization of operation parameters. For the hadron experimental facility (HD), we started beam tuning in April, but suspended by a failure of the electro static septum. After the treatment, we delivered beam at the power of 37 kW. We delivered beam at 150kW for the MLF. In the fiscal year of 2016, the linac, the 3 GeV synchrotron (RCS) and the MLF were stable and the availability was high at 93%. On the contrary, the main ring has several failures and the availabilities were 77% and 84% for NU and HD, respectively.
Hasegawa, Kazuo; Hayashi, Naoki; Oguri, Hidetomo; Yamamoto, Kazami; Kinsho, Michikazu; Yamazaki, Yoshio; Naito, Fujio*; Koseki, Tadashi*; Yamamoto, Noboru*; Hori, Yoichiro*
Proceedings of 8th International Particle Accelerator Conference (IPAC '17) (Internet), p.2290 - 2293, 2017/06
The J-PARC is a high intensity proton facility and the accelerator consists of a 400 MeV linac, a 3 GeV Rapid Cycling Synchrotron (RCS) and a 30 GeV Main Ring Synchrotron (MR). We have taken many hardware upgrades such as front end replacement and energy upgrade at the linac, vacuum improvement, collimator upgrade, etc. The beam powers for the neutrino experiment and hadron experiment from the MR have been steadily increased by tuning and reducing beam losses. The designed 1 MW equivalent beam was demonstrated and user program was performed at 500 kW from the RCS to the neutron and muon experiments. We have experienced many failures and troubles, however, to impede full potential and high availability. In this report, operational performance and status of the J-PARC accelerators are presented.
Hiraka, Haruhiro*; Hayashi, Yoichiro*; Wakimoto, Shuichi; Takeda, Masayasu; Kakurai, Kazuhisa; Adachi, Tadashi*; Koike, Yoji*; Yamada, Ikuya*; Miyazaki, Masanori*; Hiraishi, Masatoshi*; et al.
Physical Review B, 81(14), p.144501_1 - 144501_6, 2010/04
Times Cited Count:15 Percentile:55.02(Materials Science, Multidisciplinary)Hayashi, Shotaro; Kishimoto, Yoichiro; Kawata, Tomio*; *; *
PNC TN8410 88-039, 58 Pages, 1988/09
None
Hayashi, Shotaro; Kishimoto, Yoichiro; Kawata, Tomio*
PNC TN8410 88-011, 89 Pages, 1988/02
None
Kishimoto, Yoichiro; Kawata, Tomio; Hayashi, Shotaro; Nemoto, Shinichi; Kitamura, Koichiro
PNC TN8410 88-001, 142 Pages, 1987/12
None
Kishimoto, Yoichiro; Kawata, Tomio*; Hayashi, Shotaro; Nemoto, Shinichi; Kitamura, Koichiro
PNC TN8410 87-084, 144 Pages, 1987/06
no abstracts in English
Kishimoto, Yoichiro; Kawata, Tomio*; Hayashi, Shotaro; *; *; *
PNC TN8410 87-083, 50 Pages, 1987/06
no abstracts in English
Hayashi, Shotaro; Kishimoto, Yoichiro; Kawata, Tomio*; Tanaka, Mutsuo; Nemoto, Shinichi; Kitamura, Koichiro
PNC TN8410 87-082, 92 Pages, 1987/04
no abstracts in English
*; Kishimoto, Yoichiro; Kawata, Tomio*; Hayashi, Shotaro; *; Kitamura, Koichiro; Ojima, Hisao; *; *; Ueno, Kazuhiro
PNC TN8410 87-081, 98 Pages, 1986/12
no abstracts in English
Kishimoto, Yoichiro; Kawata, Tomio*; Hayashi, Shotaro; *; Tanaka, Mutsuo
PNC TN8410 87-080, 42 Pages, 1986/12
None
Yamamoto, Kazami; Hasegawa, Kazuo; Kinsho, Michikazu; Oguri, Hidetomo; Hayashi, Naoki; Yamazaki, Yoshio; Kikuchi, Kazuo; Naito, Fujio*; Koseki, Tadashi*; Yamamoto, Noboru*; et al.
no journal, ,
The Japan Proton Accelerator Research Complex (J-PARC) is a multipurpose facility for scientific experiments. The J-PARC facilities were constructed at the Tokai site of the Japan Atomic Energy Agency. The accelerator complex consists of a linac, a 3 GeV rapid-cycling synchrotron (RCS) and a main ring synchrotron (MR). The RCS delivers a proton beam to the neutron target and MR, and the MR delivers the beams to the neutrino target and the Hadron Experimental Facility. The first operation of the neutron experiments began in December 2008. In January 2009, we achieved a slow extraction of the hadron beam line at the MR. The regular neutrino experiments to obtain physical data began in January 2010. Following this, user operation has been continued with some accidental suspensions. In this report, the reliability of J-PARC and the major causes of suspension are summarized.