Design and test of SX-FEL cavity BPM  

作　　者：袁任贤 周伟民 陈之初 俞路阳 王宝鹏 冷用斌 

机构地区：[1]Shanghai Institute of Applied Physics

出　　处：《Chinese Physics C》2013年第11期100-103,共4页中国物理C（英文版）

摘　　要：This paper reports the design and cold test of the cavity beam position monitor （CBPM） for SX-FEL to fulfill tile requirement of beam position measurement resolution of less than 1 p_m, even 0.1 btm. The CBPM was optimized by using a coupling slot to damp the TM010 mode in the output signal. Tile isolation of TM01o mode is about 117 dB, and the shunt impedance is about 200 ~@4.65 GHz with the quality factor 80 from MAFIA simulation and test result. A special antenna was designed to load power for reducing excitation of other modes in the cavity. The resulting output power of TM110 mode was about 90 mV/mm when the source was 6 dBm, and the accomplishable minimum voltage was about 200 btV. The resolution of the CBPM was about 0.1 btm from the linear fitting result based on the cold test.This paper reports the design and cold test of the cavity beam position monitor （CBPM） for SX-FEL to fulfill tile requirement of beam position measurement resolution of less than 1 p_m, even 0.1 btm. The CBPM was optimized by using a coupling slot to damp the TM010 mode in the output signal. Tile isolation of TM01o mode is about 117 dB, and the shunt impedance is about 200 ~@4.65 GHz with the quality factor 80 from MAFIA simulation and test result. A special antenna was designed to load power for reducing excitation of other modes in the cavity. The resulting output power of TM110 mode was about 90 mV/mm when the source was 6 dBm, and the accomplishable minimum voltage was about 200 btV. The resolution of the CBPM was about 0.1 btm from the linear fitting result based on the cold test.

关 键 词：cavity BPM RESOLUTION cold test ANTENNA 

分 类 号：TN24[电子电信—物理电子学]