HWR010超导腔提取耦合器的优化设计  

Optimal Design of the Pick-up Coupler of the HWR010 Superconducting Cavity

作　　者：刘鑫萌 何源[2] 蒋天才[2] 高郑 薛纵横 李春龙[2] LIU Xinmeng;HE Yuan;JIANG Tiancai;GAO Zheng;XUE Zongheng;LI Chunlong(School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]中国科学院大学核科学与技术学院,北京100049 [2]中国科学院近代物理研究所,兰州730000

出　　处：《原子核物理评论》2021年第4期396-401,共6页Nuclear Physics Review

基　　金：基地人才专项(国家万人计划)(Y836050WR)。

摘　　要：我国自主研发的超导加速器CAFe是ADS加速器的前端示范装置,其对加速器的运行稳定性有非常高的要求。在CAFe的运行中存在场致发射效应干扰超导腔提取信号的问题,是造成超导腔运行故障最频繁的问题之一,这严重降低了加速器的稳定性。这一问题是由于超导腔内的场致发射电子在相关微波传输器件上引起了放电现象,干扰了信号的传输并造成低电平控制系统对超导腔的错误控制,最终导致超导腔失谐和加速器停机故障。本文通过优化提取天线的结构,避免场致发射电子进入提取耦合器,从而解决传输信号异常的问题。优化后的天线在线运行效果良好,解决了超导腔这种提取信号异常的问题,提高了加速器运行的稳定性。The China ADS Front-end demonstration facility(CAFe) is the prototype accelerator for the China Accelerator Driven Subcritical system(ADS), and exhibits extremely high requirement on operation stability. During the operation of CAFe, the field emission effect interferes with the pickup signal from the superconducting cavity,which is one of the most common causes for beam trips and other operation faults. Such interference seriously harmed the accelerator operation stability. The origin of the problem comes from the fact that field emission electrons cause discharge on the microwave transmission device, which interferes with the signal transmission and causes the low-level radio frequency system to control the superconducting cavity incorrectly, and finally leads to the superconducting cavity failure and accelerator shutdown. In this paper, the structure of the pick-up antenna was optimized to avoid the field emission electrons from entering the pick-up coupler, so as to solve the problem of abnormal signal. The optimized antenna showed desirable results during the online operation tests, the problem of abnormal signal extraction was solved, and the stability of accelerator operation was improved.

关 键 词：超导加速器 稳定运行 场致发射效应 沿面闪络 耦合器 

分 类 号：O572.211[理学—粒子物理与原子核物理]