Design and cold test of S-BAND cavity BPM for HLS  

作　　者：LUO Qing SUN BaoGen JIA QiKa HE DuoHui FANG Jia 

机构地区：[1]National Synchrotron Radiation Laboratory,School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230029,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2011年第S2期292-295,共4页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 10875117 and 11005106);National "985 Project" (Grnat No. 173123200402002);China Postdoctoral Science Foundation (Grant No. 20100470853);"the Fundamental Research Funds for the Central Universities"

摘　　要：An S-band cavity BPM is designed for a new injector in National Synchrotron Radiation Laboratory. A re-entrant position cavity is tuned to the TM110 mode as position cavity. Cut-through waveguides are used as pickups to suppress the monopole signal. Theoretical resolution of this design is 31 nm. A prototype cavity BPM system is manufactured for off-line cold tests. The wire scanning method is used to calibrate the BPM and estimate the performance of the on-line BPM system. A cross-talk problem has been detected during the cold test. Racetrack cavity BPM design can be used to suppress the cross-talk. With the nonlinear effect being ignored, transform matrix can be used to correct cross-talk. Analysis of cold test results shows that the position resolution of prototype BPM is better than 3 μm.An S-band cavity BPM is designed for a new injector in National Synchrotron Radiation Laboratory. A re-entrant position cavity is tuned to the TM110 mode as position cavity. Cut-through waveguides are used as pickups to suppress the monopole signal. Theoretical resolution of this design is 31 nm. A prototype cavity BPM system is manufactured for off-line cold tests. The wire scanning method is used to calibrate the BPM and estimate the performance of the on-line BPM system. A cross-talk problem has been detected during the cold test. Racetrack cavity BPM design can be used to suppress the cross-talk. With the nonlinear effect being ignored, transform matrix can be used to correct cross-talk. Analysis of cold test results shows that the position resolution of prototype BPM is better than 3 μm.

关 键 词：CAVITY BPM RE-ENTRANT cut-through waveguide cold test wire scanning resolution CROSS-TALK 

分 类 号：N[自然科学总论]