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中国科学院近代物理研究所自主研发的ADS注入器Ⅱ第一代高频低电平(LLRF)控制系统,工作频率为162.5 MHz;LLRF系统是由基于I/Q采样的正交解调技术构成的全数字闭环反馈控制系统,其主要功能是实现超导腔腔体电压幅值稳定控制、相位稳定控制与腔体谐振频率控制;LLRF控制系统在液氦温区超导腔上进行了系统稳定度和性能的在线测试,根据实验数据计算得超导腔体电压幅度稳定度为±3.4‰,相位稳定度为±0.3°,腔体表面峰值电场(Epk)能长时间稳定在25.1 MV/m。通过实验测试,检验了LLRF控制系统的性能,并对测试过程中出现的问题进行了分析,为将来超导腔LLRF控制系统运行积累了经验。
The first generation of high frequency and low level (LLRF) control system developed by the Institute of Modern Physics, Chinese Academy of Sciences, has an operating frequency of 162.5 MHz. The LLRF system is composed of quadrature demodulation based on I / Q sampling The full digital closed-loop feedback control system, its main function is to achieve the superconducting cavity voltage amplitude stability control, phase stability control and cavity resonance frequency control; LLRF control system in the liquid helium temperature superconducting cavity on the system stability According to the experimental data, the voltage amplitude stability of the superconducting cavity is ± 3.4 ‰ and the phase stability is ± 0.3 °. The Epk energy of the cavity can be stabilized at 25.1 MV / m for a long time. Through the test, the performance of LLRF control system was tested, and the problems in the process of testing were analyzed. It has accumulated experience for the future operation of LLRF control system.