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Tomofumi Maruta,Akihiko Miura,Hiroyuki Sako,Jun Tamura,Masanori Ikegami,Kenta Futatsukawa,Zhigao Fang,Tomoaki Miyao,Yong Liu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
The Tohoku earthquake in March 2011 caused significant damage to the Japan Proton AcceleratorResearch Complex (J-PARC) linac and forced us to shutdown the accelerator for nearly nine months. After a significant effort for its restoration, we resumed beam operation of the J-PARC linac inDecember 2011. Since the resumption of beam operation, we have been suffering from beam-losseswhich were not observed before the earthquake. Tackling the beam-loss issues, we have finallyreached the same beam power for user operation as before the earthquake. In this paper, we presentour experience with the beam start-up tuning after the earthquake, with emphasis on beam-lossmitigation efforts.