Development and Test of DC Current Transformer System for CYCIAE-100

The 100 MeV High-intensity Proton Cyclotron (CYCIAE-100) accelerates H^-. The proton beam energy is 75-100 MeV, and the maximum beam intensity is 200 μA. In order to measure the real-time proton beam intensity without disturbance, the DC current transformer system was chosen. The influence of space restriction, stray magnetic field and RF noise on detector was considered in the design of DC current transformer system, and three layers of magnetic shields were added out of the detector. One layer of brass electrical shield was outside the magnetic shields. An insulation gasket was used to interrupt the DC electrical conductivity of the beam line, and water cooling was used in the beam line pipe to keep the detector’s temperature stable. The capacitor was added to satisfy the demand of the detector at the gasket. PLC-AI module was used to get the output voltage from the DC current transformer system. The test result with simulating beam shows that the design of DC current transformer system is feasible, and the linearity and error of measurement result meet design demand.