Design of large aperture 500 MHz 5-cell superconducting cavity

Design of large aperture 500 MHz 5-cell superconducting cavity 1 2 3 first-author 1 3 corresp Corresponding author. E-mail address: liujianfei@sinap.ac.cn Corresponding author. E-mail address: liujianfei@sinap.ac.cn liujianfei@sinap.ac.cn 1 3 1 3 1 3 1 3 1 2 3 1 2 3 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China University of Chinese Academy of Sciences, Beijing 100049, China University of Chinese Academy of Sciences, Beijing 100049, China Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology, Shanghai 201800, China Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology, Shanghai 201800, China 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 Ω 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. High current Superconducting cavity (SC) HOMs Loss factor References Hiroshi S , Takaaki F , Takeshi T , et al . IPAC-WEPEC028: Cavity diagnostics using rotating mapping system for 1.3 GHz ERL 9-cell superconducting cavity , Proceedings of IPAC10 , Kyoto , 2010 , 2950 - 2952 . IPAC-WEPEC028: Cavity diagnostics using rotating mapping system for 1.3 GHz ERL 9-cell superconducting cavity Marhauser F , Clemens W , Cheng G , et al . EPAC-MOPP140: Status and test results of high crrent 5-cell SRF cavities developed at JLab , Proceedings of EPAC08 , Italy , 2008 , 886 - 888 . EPAC-MOPP140: Status and test results of high crrent 5-cell SRF cavities developed at JLab Rama R C . Linear beam dynamics and ampere class superconducting RF cavity @ RHIC, PhD. Thesis . State University of New York at Stony Brook , 2006 , 107 - 109 . Linear beam dynamics and ampere class superconducting RF cavity @ RHIC, PhD. Thesis Wang H P , Robert R , Frank M , et al . PAC-WEPMS070: Simulations and measurements of a heavily HOM-Damped multi-cell SRF cavity , Proceedings of PAC07 , New Mexico , 2007 , 2496 - 2498 . PAC-WEPMS070: Simulations and measurements of a heavily HOM-Damped multi-cell SRF cavity Sergey B , Valery S . 12th International Workshop on RF Superconductivity. SRF 060424-03: High-β Cavity Design-A Tutorial , SRF , Ithaca , July, 2005 . Song C , Hoffstaetter G . PAC-TUPMS022: Beam break up simulations for the Cornell X-ray ERL , Proceedings of PAC07 , New Mexico , 2007 , 1227 - 1229 . PAC-TUPMS022: Beam break up simulations for the Cornell X-ray ERL Liu Z C . Study and design of high current SC RF cavity, PhD. Thesis of Peking University , 2009 , 56 - 59 . Study and design of high current SC RF cavity, PhD. Thesis Bruno W Z and Semyon A K . Impedance and Wakes in High-Energy Particle Accelerators . Singapore , World Scientific Publishing Co. Pte. Ltd , 1998 , 97 - 99 . ABCI, http://abci.kek.jp/abci.htm . Impedance and Wakes in High-Energy Particle Accelerators 10.13538/j.1001-8042/nst.23.257-260 Supported by Research on HOM damping for 500MHz 5cell superconducting rf cavity 2011-11-18 2012-10-20 2021-01-19 2012 Nuclear Science and Techniques 05 23