Design optimization and cold RF test of a 2.6-cell cryogenic RF gun  

作　　者：Cheng Wang Jian-Hao Tan Xiao-Xia Huang Yi-Xing Lu Lin Wang Wen-Cheng Fang Zhen-Tang Zhao 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Shanghai Synchrotron Radiation Facility,Chinese Academy of Sciences,Shanghai 201204,China

出　　处：《Nuclear Science and Techniques》2021年第9期84-93,共10页核技术（英文）

基　　金：supported by the National Key R&D Program of China(No.2018YFF0109203);ANSO(ANSO-CR-KP-2020-16).

摘　　要：To further improve the performance of acceler-ators,the first cryogenic normal-conducting RF gun in China was designed and manufactured.As a new and attractive trend,this optimized cryogenic RF gun can generate a low-emittance beam with a short-driven laser pulse because of its promising high gradient on the cath-ode.In this paper,optimization of the RF design and beam dynamics,including suppression of the peak RF field and elimination of the multipole mode,is presented.In addi-tion,the emittance growth caused by the alignment devi-ation and RF jitter is discussed.After the gun was manufactured,a cold test was conducted at both room temperature and cryogenic conditions.At room tempera-ture,the field distribution was obtained by the bead pull method.Under cryogenic conditions,the RF properties,such as the coupling coefficient and quality factor,varied with temperature.The test results agreed with the design.In the cryogenic test,vibration measurements were performed.Without vibration isolation,a maximum vibration of 50 lm was observed.These cold test results are the basis of the following high-power test.

关 键 词：PHOTOINJECTOR Cryogenic structure C-BAND Cold test 

分 类 号：TL50[核科学技术—核技术及应用]