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Description
A kicker magnet system is under development for the Shanghai High repetition rate X-ray Free Electron Laser and Extreme Light Facility (SHINE) at the Shanghai Advanced Research Institute, Chinese Academy of Sciences (SARI, CAS). Mitigating thermal drift during extended operation is essential to maintain the beam distribution stability. A high-precision current feedback control system has been designed to regulate the kicker power supply at 1 MHz with an amplitude stability below 100 ppm. The system integrates a differential amplification circuit using a low-thermal-coefficient resistor network for real-time drift compensation, together with a proportional–integral–derivative (PID) control operating at a response time of ~100 ms to stabilize the output current. This approach supports current measurement resolution on the order of ~10 ppm. Under1 MHz pulsed operation, the experimental results achieve a pulse-to-pulse amplitude stability of 63.7 ppm over 30 minutes with closed-loop feedback, and maintain stability within 150 ppm after 8 hours of continuous running. The design, implementation, and tested performance of the system are reported and discussed.
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