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TY - CONF AU - Saha, P.K. AU - Harada, H. AU - Hotchi, H. AU - Okabe, K. AU - Tamura, F. AU - Yoshimoto, M. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - Foil Hits Reduction by Minimizing Injection Beam Size at the Foil in J-PARC RCS J2 - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021 CY - Campinas, SP, Brazil T2 - International Particle Accelerator Conference T3 - 12 LA - english AB - The uncontrolled beam loss caused by the foil scattering of the circulating beam during multi-turn charge-exchange injection is one of the main sources for high residual radiation at the injection area of J-PARC 3-GeV rapid cycling synchrotron. We studied to reduce foil hits of the circulating beam by minimizing the vertical injection beam size at the foil and using a smaller vertical foil size. The vertical foil size was reduced according to the injection beam size by maintaining the stripping efficiency. As a result, the number of circulating beam passing through foil was significantly reduced due to smaller foil size. The simulation and measurement results of the foil hits reduction are presented in this paper. PB - JACoW Publishing CP - Geneva, Switzerland SP - 590 EP - 593 KW - injection KW - proton KW - scattering KW - beam-losses KW - operation DA - 2021/08 PY - 2021 SN - 2673-5490 SN - 978-3-95450-214-1 DO - doi:10.18429/JACoW-IPAC2021-MOPAB174 UR - https://jacow.org/ipac2021/papers/mopab174.pdf ER -