Abstract
Low-level radio frequency (LLRF) control systems are used to achieve extremely precise field control of superconducting cavities in accelerators. Recently, a µTC-based LLRF system has been developed at compact energy recovery linac (cERL) at KEK. To improve the feedback control performance, we have developed some real-time digital signal processing (DSP) algorithms for applications with FPGA in the LLRF systems. We have surveyed the proportional and integral gains to optimized the feedback control. In the cERL, the existence of the parasitic mode in the nine-cell cavity limits the loop gain during the feedback operation. To solve this problem, a high-order IIR filter has been proposed and developed to suppress the parasitic modes. Here, we present these real-time DSP algorithms and FPGA works with preliminary results.
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