Development of the Beam Diagnostics System for the J-PARC Rapid-Cycling Synchrotron

Development of the beam diagnostics system for the J-PARC Rapid-Cycling Synchrotron is described. The system consists of Beam Position Monitor (BPM), Beam Loss Monitor (BLM), Current monitors (DCCT, SCT, MCT, FCT, WCM), Tune monitor system, 324MHz-BPM, Profile monitors, and Halo monitor. The BPM is electro-static type and its electronics is designed for both COD and turn-by-turn measurements. Five current monitors have different time constants in order to cover wide frequency range. The tune monitor is consisted of the exciter and the beam pick-up electrode. For the continuous injected beam monitoring, 324MHz-BPM detects Linac frequency. Two types of profile monitor are multi-wire for low intensity tuning and the residual gas ionization monitor for non-destructive measurement.