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

作　　者：慕振成[1,2] 李刚[3] 李健[1] 徐新安[1] 姚远[1] 乔际民[1] 张宗花[1] 刘少真[1,2] 

机构地区：[1]中国科学院高能物理研究所,北京100049 [2]中国科学院研究生院,北京100049 [3]中国航天科工集团第二研究院第二十三研究所,北京100854

出　　处：《强激光与粒子束》2010年第2期433-437,共5页High Power Laser and Particle Beams

基　　金：洁净核能ADS项目

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。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 communication and cooperate the FPGA to process data. The online debugging result satisfies the requirements of the control precision.

关 键 词：数字低电平控制 I/Q解调 幅相控制 矢量旋转 

分 类 号：TL503.6[核科学技术—核技术及应用]