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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.
Superconducting Dipole Magnet for Strangeness Physics Program at J-PARC
Jung Keun Ahn,Sung Hyun Kim,Shin Hyung Kim,Imai, Kenichi,Sako, Hiroyuki,Seyong Choi,Takahashi, Toshiyuki Institute of Electrical and Electronics Engineers 2016 IEEE transactions on applied superconductivity Vol.26 No.4
<P>A large-acceptance superconducting dipole magnet is currently under construction for extensive strangeness nuclear physics programs at Japan Proton Accelerator Research Complex (J-PARC), Japan. The conduction-cooled superconducting magnet is composed of two circular coils with a radius of 500 mm, vertically 500 mm apart from each other. This Helmholtz-type magnet was designed to keep the field uniformity Br/By at the level of 1% over the inner region of 500 mm in diameter and 500 mm in height. Our main detector is a time projection chamber that uses parallel E and B fields. If there is a transverse component, drifting electrons would take helical paths due to the E⃗ × B⃗ effect. As a result, the field uniformity is crucial in the design of the magnet. The maximum field strength is 1.5 T. We report our design study and coil test results using a test cryochamber.</P>