Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2012, Vol. 23 ›› Issue (5): 257-260 doi: 10.13538/j.1001-8042/nst.23.257-260


Design of large aperture 500 MHz 5-cell superconducting cavity

WEI Yelong 1,2,3 LIU Jianfei 1,3,* HOU Hongtao 1,3 MA Zhenyu 1,3 MAO Dongqing 1,3 FENG Ziqiang 1,3 LU Changwang 1,2,3 YU Haibo 1,2,3   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China 2 University of Chinese Academy of Sciences, Beijing 100049, China 3 Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology, Shanghai 201800, China
WEI Yelong, LIU Jianfei, HOU Hongtao, MA Zhenyu, MAO Dongqing, FENG Ziqiang, LU Changwang, YU Haibo . Design of large aperture 500 MHz 5-cell superconducting cavity.Nuclear Science and Techniques, 2012, 23(5): 257-260     doi: 10.13538/j.1001-8042/nst.23.257-260


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.

Key words: High current, Superconducting cavity (SC), HOMs, Loss factor