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TY - CONF AU - Shobuda, Y. AU - Horino, K. AU - Kamiya, J. AU - Kotoku, K. AU - Takayanagi, T. AU - Ueno, T. AU - Yanagibashi, T. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - A Possible Modification of Ceramic Chambers in the Injection Area at the RCS in J-PARC 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 J-PARC RCS is composed of ceramic chambers covered over copper stripes to suppress the eddy current on the chamber. The inductance, comprising the copper stripes and flanges, in combination with the capacitors makes an LCR electric circuit with the chamber and can cause field modulation in the chamber. Though most chambers are not harmful at the RCS, the chambers at the injection area excite beam losses, because a trapezoid field pattern is excited to accumulate LINAC beam during the injection period. In this report, we consider several types of ceramic chambers to suppress the field modulation. One type is a ceramic chamber covered over copper stripes in parallel with damping resistors. Another is that covered over spiral copper stripes with only capacitors. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3205 EP - 3208 KW - impedance KW - simulation KW - injection KW - dipole KW - proton DA - 2021/08 PY - 2021 SN - 2673-5490 SN - 978-3-95450-214-1 DO - doi:10.18429/JACoW-IPAC2021-WEPAB245 UR - https://jacow.org/ipac2021/papers/wepab245.pdf ER -