Reliability of Japan Proton Accelerator Research Complex

Yamamoto, Kazami   ; Hasegawa, Kazuo; Kinsho, Michikazu  ; Oguri, Hidetomo  ; Hayashi, Naoki  ; Yamazaki, Yoshio ; Kikuchi, Kazuo; Naito, Fujio*; Koseki, Tadashi*; Yamamoto, Noboru*; Yoshii, Masahito*; Hori, Yoichiro*

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.