Developments of residual gas ionization profile monitors for J-PARC RCS and 50 GeV MR

Sato, Kenichiro; Lee, S.*; Toyama, Takeshi*; Hayashi, Naoki  

3 GeV Rapid Cycling Synchrotron and 50 GeV Main Ring Synchrotron in J-PARC, which is under construction, are expected to accelerate high power proton beam of 1 MW and 0.75 MW class, respectively. To measure such a high intensity beam profile, we have been developing Residual Gas Ionization Profile Monitors (IPMs). To confirm the reliability of this type monitors, we constructed a prototype and installed in Main Ring of Proton Synchrotron at KEK and tested using proton beams for two different operation modes, that is ion and electron collection mode using magnetic guiding field. The obtained data are used to discuss the detection reliability of the real ones.