2MeV行波电子直线加速器自动频率控制系统  

An automatic frequency control system of 2-MeV electronic LINAC

作　　者：胡雪[1,2] 张俊强[1] 钟少鹏[1] 赵明华[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》2013年第7期31-34,共4页Nuclear Techniques

摘　　要：在电子直线加速器中,微波功率源输出频率的稳定性非常重要,它直接影响到加速器整机的物理性能指标。由于微波功率源磁控管的输出频率会随外部工作环境变化而发生漂移,所以必需在电子直线加速器中采用自动频率控制(AFC)系统。讨论了2MeV小型行波电子直线加速器AFC系统的设计要素,分析了微波信号的鉴频原理及鉴频模块的测试结果。结合实际的工作环境,测试了信号处理单元主要功能模块的输出,并对测量结果的精度进行了分析。Background： In electronic LINAC, the magnetron is often used as power source. The output frequency of magnetron always changes with the environment and the frequency difference between the output of magnetron and the frequency of accelerator, which will result in the bad performance of L1NAC systems. Purpose： To ensure the performance of the work of entire LINAC system effectively, an automatic frequency control system is necessary. Methods： A phase locked frequency discriminator is designed to discriminate the frequency of accelerator guide and magnetron, and analogue circuit is used to process the output signals of frequency discriminator unit. Results： Working with the automatic frequency control （AFC） system, the output frequency of magnetron can be controlled in the range of （2 998 MHz, 2998 MHz＋70 kHz） and （2 998 MHz, 2 998 MHz-30 kHz）. Conclusions： Under the measurement and debug, the functionality of frequency discriminator unit and signal processor circuit is tested effectively.

关 键 词：鉴频模块 行波电子直线加速器 自动频率控制(AFC) 信号处理 

分 类 号：TL53[核科学技术—核技术及应用] TN709[电子电信—电路与系统]