Injection energy recovery of J-PARC RCS

Hayashi, Naoki  ; Hotchi, Hideaki  ; Kamiya, Junichiro   ; Saha, P. K.   ; Takayanagi, Tomohiro   ; Yamamoto, Kazami   ; Yamamoto, Masanobu   ; Yamazaki, Yoshio 

The J-PARC RCS is a high beam power Rapid-Cycling Synchrotron (RCS). The original designed injection energy is 400 MeV, although presently it is 181 MeV, and its beam power is limited to 0.6 MW. Works to recover the Linac energy are ongoing and injection magnets power supplies upgrade for two bump and new knob are required in the RCS. In order to achieve 1 MW designed beam power, new instrumentation, like quadrupole corrector or to reduce kicker impedance, are also planned simultaneously. Activities related injection energy recovery in the J-PARC RCS are presented.