New power supply of the injection bump magnet for upgrading the injection energy in the J-PARC 3-GeV RCS

Takayanagi, Tomohiro   ; Hayashi, Naoki  ; Ueno, Tomoaki; Togashi, Tomohito; Tani, Norio  ; Kinsho, Michikazu  ; Toda, Katsunori*

With the energy upgrading of LINAC to 400 MeV in the J-PARC, a new power supply of the injection bump magnet has been designed for the 3-GeV RCS. The new power supply of the shift bump magnet is composed with the capacitor bank which has function to form the output current pattern. This power supply is a commutation strategy using the electrical charge and discharge of the capacitor, and the frequency of the switch that becomes the source of the noise is a little. Comparing to the conventional switching-type power supply, this power supply is switched only three times for the pattern formation. Thus, the ripple due to the switching can be expected to be much lower. The 1/16 scale model was manufactured and the characteristics was evaluated. This paper summarizes the design parameter and the experimental result of the new power supply.