Design and preliminary performance of the new injection shift bump power supply at the J-PARC 3-GeV RCS

Takayanagi, Tomohiro   ; Hayashi, Naoki  ; Kinsho, Michikazu  ; Ueno, Tomoaki; Togashi, Tomohito; Horino, Koki; Irie, Yoshiro*

New power supply of the injection shift bump magnet at the J-PARC 3-GeV RCS has been designed with the energy upgrading of LINAC to 400 MeV. The power supply is required to output the maximum current of 32 kA, which is 1.6 times the present current. Moreover, both current ripple noise and deviation should be less than 0.2% in a range from 10 kA to 32 kA output current. The IGBT chopping system as in the present power supply occurs the continuous current ripple due to the switching. So the circuit structure of the power supply has been changed from the IGBT chopping system to the PFN system by switching the capacitors. The power panel is comprised of 16 banks, each of which outputs 2 kA at 14 kV at maximum. More than four banks have been manufactured and the characteristics were evaluated in the factory. This paper summarizes the design and the experimental results of the new power supply.