• M. Yamamoto, K. Hasegawa, M. Nomura, A. Schnase, T. Shimada, H. Suzuki, F. Tamura
  JAEA/J-PARC, Tokai-mura
• E. Ezura, K. Hara, C. Ohmori, M. Tada, A. Takagi, M. Yoshii
  KEK, Ibaraki
• K. Horino
  Nippon Advanced Technology Co. Ltd., Ibaraki-prefecture

J-PARC RCS is in the beam commissioning period. Some longitudinal beam gymnastics and the acceleration has been successfully perfomed under the high intensity operation. We have developed a longitudinal particle tracking code, which includes beam loading and space charge effects. The comparison between the beam test result and the particle tracking simulation is described.