Digital controller for Rapid Cycling Synchrotron magnet power supply with very high tracking precision

In Rapid Cycling Synchrotron, very high tracking precision is required for the magnets power supply, while the load is high order resonant network. In this paper, a digital PID controller combined with repetitive control algorithm is studied for such an application. Feedforward scheme is also adopted to reduce the tracking error under the periodical reference. A digital controller based on DSP is built and tested on a prototype power supply with emulated load. Experimental results show that the proposed control system achieves nearly 0.1% reference tracking precision.