Design of large aperture 500 MHz 5-cell superconducting cavity

作     者：WEI Yelong LIU Jianfei HOU Hongtao MA Zhenyu MAO Dongqing FENG Ziqiang LU Changwang YU Haibo WEI Yelong;LIU Jianfei;HOU Hongtao;MA Zhenyu;MAO Dongqing;FENG Ziqiang;LU Changwang;YU Haibo

作者机构：Shanghai Institute of Applied Physics Chinese Academy of Sciences Jiading Campus Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology Shanghai 201800 China 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2012年第23卷第5期

页      面：257-260页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 0810[工学-信息与通信工程] 080801[工学-电机与电器] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080402[工学-测试计量技术及仪器] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 081001[工学-通信与信息系统] 

基　　金：Supported by Research on HOM damping for 500MHz 5cell superconducting rf cavity 

主　　题：超导腔 设计 直线加速器 光圈 无线电频率 能量回收 几何因子 模拟技术 

摘      要：With the potential application of Energy Recovery Linac (ERL), the superconducting (SC) cavities were developed to deliver much higher current than before. Nowadays, the current of the international SC accelerator designed has already exceeded 100 mA. This paper presents the design of a new 500 MHz 5-cell SC cavity (SINAP 5-cell cavity), in which the parameters r/Q= 515.5 of the fundamental mode and the geometry factor G=275.8 are under an acceptable Radio Frequency (RF) field level (B peak /E acc =4.31 mT/MV/m and E peak /E acc =2.48). This design employs a larger beam pipe to propagate the Higher Order Modes (HOMs) out of the cavity and increases the damping efficiently for the dangerous HOMs. By simulation technique, it has been found that almost all the dangerous HOMs (including TE 111 , TM 110 , and TM 011 ) can be propagated into the beam pipe and are absorbed by ferrite absorbers, when the beam pile is enlarged. Finally, the loss factor for the new 5-cell cavity is also calculated.