Intensity dependence of the beam current monitors at J-PARC RCS

Hayashi, Naoki  

Measurement of beam intensity or beam current is the one of the most important beam diagnostic in an accelerator. At J-PARC Rapid-Cycling Synchrotron (RCS), there are two kinds of beam intensity monitors and multiple Current Transformers (CT) with various bandwidth. The RCS is a high intensity proton accelerator and its designed beam power of 1 MW. The beam power delivered to users gradually increases in the recent year. Single pulse or short term with designed beam power has been also demonstrated. In addition, beyond 1-MW equivalent intensity has been attempted. Through the experience with achievement of the design goal and the operation beyond it, intensity dependence of beam current measurement has been summarized.