Present status of the J-PARC RCS paint bump power supply

Ueno, Tomoaki; Takayanagi, Tomohiro   ; Horino, Koki; Tobita, Norimitsu*; Yamamoto, Kazami   ; Kinsho, Michikazu  

The horizontal and vertical paint bump magnets of the J-PARC (Japan Proton Accelerator Research Complex) 3-GeV RCS (Rapid Cycling Synchrotron) realize the uniform beam distribution of the RCS circulating beam by a small injection beam of the emittance form the Linac (Linear Accelerator). The power supply of the horizontal painting magnet has been performed a good accuracy less than 1% deviation to programmed pattern. However, the fluctuation of the output current less than 1% is equivalent to 1 mm displacement of the beam orbit and it increases the beam loss. This paper reports the present status and the result of the fluctuation measures of the painting bump power supply system.