Simulation of controlled longitudinal emittance blow-up in J-PARC RCS

Yamamoto, Masanobu   ; Nomura, Masahiro  ; Schnase, A.; Shimada, Taihei ; Tamura, Fumihiko   ; Ezura, Eiji*; Hara, Keigo*; Hasegawa, Katsushi*; Omori, Chihiro*; Takagi, Akira*; Takata, Koji*; Toda, Makoto*; Toyama, Takeshi*; Yoshii, Masahito*

In J-PARC RCS, the high intensity beam is delivered to the MR. The longitudinal beam emittance at the RCS extraction should be optimized to avoid the beam loss after the MR injection. In order to match the longitudinal emittance shape between the RCS and the MR, it is desirable to enlarge the longitudinal emittance during the RCS acceleration. We have performed the particle tracking simulation for the controlled longitudinal emittance blow up in the RCS.