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TY - CONF AU - Saha, P.K. AU - Harada, H. AU - Hayashi, N. AU - Hotchi, H. AU - Kinsho, M. AU - Nomura, M. AU - Shobuda, Y. AU - Tamura, F. AU - Tani, N. AU - Watanabe, Y. AU - Yamamoto, M. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Simulation Studies and Measurements of Beam Instabilities Caused by the Kicker Impedance at High Intensities in the 3-GeV RCS of J-PARC J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - The transverse impedance of the extraction kickers is a significant beam instability source in the 3-GeV Rapid Cycling Synchrotron of J-PARC. ORBIT code was developed for space charge and beam instability simulations by successfully introducing realistic time dependent machine parameters. The beam instability at high intensities, especially at the designed 1 MW beam power was found be very critical. As there was no practical measure yet to reduce the kicker impedance, a detail simulation studies were done in order to determine realistic machine parameters to suppress the beam instability. The simulation results were found to be very consistent with measurements to successfully accomplish 1 MW beam power. The simulation and beam study results in detail are presented in this paper. PB - JACoW CP - Geneva, Switzerland SP - 589 EP - 591 KW - simulation KW - impedance KW - kicker KW - injection KW - betatron DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-MOPOR003 UR - http://jacow.org/ipac2016/papers/mopor003.pdf ER -