New injection bump power supply of the J-PARC RCS

Takayanagi, Tomohiro   ; Hayashi, Naoki  ; Ueno, Tomoaki*; Horino, Koki; Okabe, Kota  ; Kinsho, Michikazu  ; Irie, Yoshiro*

The new injection bump power supply for the shift bump (SB) magnet of the beam injection system at the J-PARC (Japan Proton Accelerator Research Complex) 3-GeV RCS (Rapid-Cycling Synchrotron) has been developed and manufactured. The power capacity of the new power supply demand doubling with the injection beam energy upgrading of the LIANC (Linear Accelerator) from 181 MeV to 400 MeV. Furthermore, the low ripple noise on the output current was required to prevent the occurrence of the resonation between the excitation magnetic field and the RF shield loop covered the ceramics duct at the magnet. The power supply newly adopted a capacitor commutation method to form the trapezoid waveform pattern (bump waveform). This paper reports characteristic about the new shift bump power supply.