Bunch charge monitoring system based on integrating current transformer

A bunch charge monitor system has been designed for the photocathode RF gun of Accelerator Laboratory, Tsinghua University. Integrating current transformer is the most important part of the system, and parts of the system after integrating current transformer consist of a preamplifier, an integrator, an AD converter and a data collection module. The system does not destroy the beam, and it can monitor the bunch charge in the high-radiation environment around accelerator. The results of some off-line tests show that the system is feasible.