Development for temperature measurement of the stripper foil in J-PARC RCS

Yoshimoto, Masahiro  ; Yamada, Ippei ; Nakanoya, Takamitsu ; Saha, P. K.   ; Hatakeyama, Shuichiro; Saeki, Riuji*; Kuramochi, Masaya*; Otsu, Satoru*

To achieve a high-intensity proton beam, the J-PARC 3-GeV rapid cycling synchrotron accelerator (RCS) adopts the multi-turn charge-exchange beam injection scheme, in which the carbon stripper foils remove the electron from the injected H beam to convert the H beam. Up to now, we have demonstrated that the foils have a sufficient lifetime for continuous beam operation at the design power of 1 MW. On the other hand, we are investigating the possibility of increasing the beam power at the J-PARC further; we hope to achieve a maximum output of 2 MW at the RCS. In general, the key issue for the stripper foil at higher power beam irradiation is the shortened lifetime due to the rising foil temperature. As it reaches the sublimation temperature, it is of concern that the foil's thickness is rapidly decreasing. In this presentation, we will report the simulation result of the rising foil temperature according to the RCS beam power upgrade plan and the recent status of the study for the versatile foil temperature measurement.