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

作者：Luo Qing^*; Sun BaoGen; Jia QiKa; He DuoHui; Fang Jia

来源：Science China Physics,Mechanics & Astronomy, 2011, 54: S292-S295.

DOI：10.1007/s11433-011-4555-y

• cavity BPM
• re-entrant
• cut-through waveguide
• cold test
• wire scanning
• resolution
• cross-talk

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 mu m.

• 出版日期2011-12
• 单位中国科学技术大学