CSNS-II超导椭球腔频率控制仿真研究  

Simulation Analysis on Frequency Control of Superconducting Elliptical Cavity for CSNS-II Linac

作　　者：李波[1,2] 刘华昌 王云[1,2] 瞿培华 李阿红[1,2] 吴小磊 樊梦旭[1,2] 陈强 

机构地区：[1]中国科学院高能物理研究所,北京 [2]散裂中子源科学中心,广东 东莞

出　　处：《核科学与技术》2020年第3期130-136,共7页Nuclear Science and Technology

摘　　要：超导椭球腔研制过程中工作频率的控制至关重要,工作频率偏差过大,可能会使腔体承受过大的调谐力,或者超出调谐器调谐范围,或者产生塑性形变,影响腔体模式和机械性能。因此,工作频率要控制到要求的调谐范围内,腔体才能很好的应用在实际工程上。本文使用COMSOL软件对影响CSNS-II (China Spallation Neutron Source upgrade)椭球腔工作频率的各个因素进行了仿真模拟,包括真空介质及抽真空形变,腔体2 K降温收缩,抛光的厚度,重力作用,频率随赤道半径的变化,调谐灵敏度进行了仿真分析,确保椭球腔最终工作频率的准确,能用于CSNS-II升级的实际工程。Controlling frequency drift is very important during superconducting elliptical cavity development. If the frequency deviation is too large, it may cause the cavity to bear too large tuning force, or exceed the tuning range of the tuner, or produce plastic deformation, which will affect the cavity mode and mechanical properties. So, only when the frequency reaches the required tuning range, the cavity can be applied in practical engineering. Factors that affect the frequency of elliptical cavity were simulated for China Spallation Neutron Source upgrade in this paper, including vacuum medium and vacuum deformation, 2 K cooling contraction, polishing, gravitation, variation of frequency with equator radius and tuning sensitivity. To ensure the accuracy of the final frequency of elliptical cavity, it can be used in the engineering of CSNS-II upgrading.

关 键 词：超导椭球腔 工作频率 真空 降温收缩 抛光 重力作用 调谐灵敏度 

分 类 号：TN9[电子电信—信息与通信工程]