New injection bump power supply of the J-PARC RCS

Takayanagi, Tomohiro   ; Ueno, Tomoaki*; Horino, Koki; Tobita, Norimitsu; Hayashi, Naoki  ; Kinsho, Michikazu  ; Irie, Yoshiro*; Okabe, Kota  ; Tani, Norio  ; Naito, Shingo*; Shi, Harushige*; Toda, Katsunori*

The new injection bump power supply for the shift bump magnet of the beam injection sub-systems 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 was more than doubled with the injection beam energy upgrading of the LINAC (Linear Accelerator) from 181 MeV to 400 MeV. Furthermore, the low ripple noise on the output current was required to prevent the resonance of the RF shield loop at the ceramic duct with the excitation magnetic field. The power supply newly adopted a capacitor commutation method to form the trapezoid waveform pattern (bump waveform). This paper reports characteristic about the new power supply.