A high sensitivity tune measurement system for BEPCII

• Published in: Radiation detection technology and methods Vol. 6; no. 1; pp. 88 - 96
• Main Authors: He, Jun, Sui, Yan-feng, Lu, Yan-hua, Du, Yao-yao, Wang, Lin, Ma, Hui-zhou, Li, Yong, Zhao, Ying, Yu, Ling-da, Xu, Tao-guang, Yue, Jun-hui, Cao, Jian-she
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01.03.2022
• Subjects: Beam Physics; Hadrons; Heavy Ions; Nuclear Energy; Nuclear Physics; Original Paper; Particle Acceleration and Detection; Physics; Physics and Astronomy; Red Pitaya; Real-time tune; Collider; Direct diode detection; High sensitivity
• ISSN: 2509-9930; 2509-9949
• DOI: 10.1007/s41605-021-00300-6

Background The tune is one of the most important parameters of the storage ring which play a crucial role in the brightness optimization. The synchrotron radiation will suppress the oscillation and make the detection unusual difficulty without any kicker excitation. Purpose A new high sensitivity tune measurement system is developed to show the real-time tune during the colliding. Method Peak diode detectors are used to convert short beam pulses from a button BPM into slowly varying signals. Their DC components, constituting a large background related to beam offsets, are suppressed by series capacitors, while the small signals related to beam oscillations are passed to the subsequent stages for amplification and filtering. Conclusion A direct diode detection technique based on the diode peak hold circuit could increase the sensitivity by hundreds time which gets a clearly tune peak even with synchrotron radiation and bunch-by-bunch feedback damping.