强流质子RFQ加速器高频数字低电平控制系统
Digital low-level RF control system for high intensity proton RFQ accelerator
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摘要: 强流质子RFQ加速器加速场的频率为352.2 MHz，加速场幅度和相位的精度分别要求控制在±1%和±1°的范围，为了达到这一要求，设计了一套数字低电平控制系统，该系统包括加速场的幅度和相位控制、腔体的谐振频率控制和高功率射频连锁保护３个部分。腔体采样信号的下变频及反馈激励信号的上变频由模拟器件来完成。幅相实时反馈处理过程采用数字I/Q解调的方法，在1块stratixⅡ的FPGA板上实现，板上另有3块DSP用于通信和协助FPGA进行数据处理。系统完成后与RFQ加速器进行联机调试，测试结果基本满足控制精度的要求。Abstract: The resonant frequency of the high intensity proton RFQ accelerator at the Institute of High Energy Physics is 352.2 MHz, and the control precision of the accelerating field is ±1% in amplitude and ±1° in phase, respectively. In order to accomplish these requirements, a digital low-level RF(LLRF) control system is adopted. This system includes three parts: the accelerating field amplitude and phase control, the cavity resonant frequency control and the high power interlock protection. The down-conversion of the cavity sampling signal and the up-conversion of the feedback excitation signal are realized by the analog devices. The real time feedback control of amplitude and phase adopts digital I/Q demodulation, and is assembled in a FPGA block, where three DSP blocks are used for communic
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Key words:
- digital low-level rf control /
- amplitude and phase control /
- vector rotation /
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