Monitoring system of number of particles in J-PARC Linac and RCS

Takahashi, Hiroki  ; Sawabe, Yuki; Ishiyama, Tatsuya*; Sakaki, Hironao*

In J-PARC Linac and RCS, beam operation that does not exceed the allowable (limit) amount of integrated particles per hour must be performed. Then, to measure and monitor the integrated particles for each beam destination, the monitoring system of number of particles was developed. In this system, in order to monitor the number of particles correctly and reliably, it is indispensable to eliminate the mistake (error) of beam current measurement. Therefore, we have developed a particle counter that measures the number of particles correctly and reliably at a 25 Hz period by supervising the timing signals for beam measurement. In this paper, the functions of the monitoring system of number of particles will be described focusing on the timing signal supervising function of the particle counter.