基于MicroTCA的自动频率控制系统  

An automatic frequency control system based on MicroTCA

作　　者：唐兴海[1,2] 刘亚娟[1] 张俊强[1] 李林[1] 顾强[1] 

机构地区：[1]中国科学院上海应用物理研究所嘉定园区,上海201800 [2]中国科学院大学,北京100049

出　　处：《核技术》2016年第7期9-14,共6页Nuclear Techniques

摘　　要：高品质的束流是产生高品质同步辐射光或自由电子激光的关键,电子直线加速器作为同步辐射光源的注入器,其性能表现直接影响到束流品质。为降低噪声(温度变化、机械振动等)的干扰,本文研究和实现了一个通用、鲁棒、高效、可扩展性好的电子直线加速器低电平控制系统。目前已经实现了自动频率控制(Automatic Frequency Control,AFC)功能,更多控制功能将会陆续实现。该系统基于MicroTCA,选用实验物理与工业控制系统(Experimental Physics and Industrial Control System,EPICS)架构,采用C/C++开发,利用PID(ProportionIntegral-Differential)算法和最小二乘法,能够采用两种不同的方法进行自动频率控制。在巴西Sirius光源直线加速器实验装置上对该控制系统进行调试和测试,结果表明,两种AFC方法都是有效的,且存在明显差异,未来将进一步优化和完善。Background： High quality electronic beam is the key to produce high quality synchrotron radiation or free-electron laser （FEL）. Microwave electronic LINAC plays the role of injector, whose performance influences the quality of electronic beam deeply. Purpose： In order to minimize the noise interference （temperature, microphonics, etc）, we develop a universal, robust, efficient and extendible Low Level Radio Frequency （LLRF） control system, in which automatic frequency control （AFC） function is already implanted and more functions will be embedded in the future. Methods： This system, based on MicroTCA, adopts Experimental Physics and Industrial Control System （EPICS） structures, and develops in C/C＋＋. The core algorithms are Proportion-Integral-Differential （PID） and Least-Squares method. Results： Two different ways of AFC were realized and the system was tested on Sirius-LINAC test facility. Conclusion： The result shows that the cavity is well tuned when the AFC system is on, and obvious differences are found. This system will be optimized and enlarged in the future.

关 键 词：电子直线加速器 MicroTCA 实验物理与工业控制系统 自动频率控制 最小二乘法 PID算法 

分 类 号：TL503.6[核科学技术—核技术及应用]