Report of the temperature problem of new horizontal shift bump power supply at the J-PARC RCS

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

In 3-GeV RCS of J-PARC, the new shift bump power supply has been development and manufactured according to upgrading of 400 MeV injection beam energy of the LINAC. However, the trouble of the DC charger of the FT-unit, which did not occur in the factory, was frequent. Therefore, in user operation, the power supply was operated only with the R/F-unit without using the FT unit. As a result, the flat-top part of the bump waveform was to be a downward. The electrolytic capacitor of the R/F-unit can be not regenerated the energy of this flat top part and the operation time of the DC charger was became usually longer than time. The DC charger was overloaded and the temperature of the circuit parts was higher.