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The first generation Low-Level radio frequency(LLRF) control systemindependently developed by IMPCAS, the operating frequency is 162.5MHz forChina ADS, which consists of superconducting cavity amplitude stabilitycontrol, phase stability control and the cavity resonance frequency control.The LLRF control system is based on four samples IQ quadrature demodulationtechnique consisting an all-digital closed-loop feedback control. This papercompleted the first generation of ADS LLRF control system in thelow-temperature superconducting cavities LLRF stability and performance onlinetests. Through testing, to verify the performance of LLRF control system, toanalysis on emerging issues, and in accordance with the experimental data, tosummarize LLRF control system performance to accumulate experience for thefuture control of superconducting cavities.

The Test of LLRF control system on superconducting cavity