The Residual Gas Ionization Profile Monitor in the J-PARC 3-GeV Rapid Cycling Synchrotron

The residual gas Ionization Profile Monitor (IPM) is developed in the J-PARC 3-GeV RCS. The IPM is a non-destructive beam profile monitor to observe a circulating transverse beam profile in the ring. It is very important to observe the beam profile turn-by-turn in the ring for identification of the beam loss and emittance growth source because beam loss is always issue in increasing the beam power in terms of keeping hands on maintenance. The IPM has been continuously upgraded since 2008. The recent progress of the IPM is reported together with the outline of IPM system.