Description
The superconducting third harmonic cavity which has developed in Shanghai Synchrotron Radiation Facility (SSRF) has passed tests. A digital low level radio frequency (DLLRF) controller has been developed and achieved the goal of stretching beam cluster and improving beam life. The controller based on a Field-Programmable Gate Array (FPGA) board and a front-end board which adjust the stepper motor and piezoelectric ceramic. When the state is in top-up mode over 120mA, the amplitude stability has improved form ±5% with open loop to less than ±1% with close loop, the voltage of piezo has varies smoothly and stably within 120V, and the beam life has improved more than doubled.
Primary authors
Zhigang Zhang
Mr
Yubin Zhao
Xuefang Huang
(Shanghai Advanced Research Institude, Chinese Academy of Saiences)
Xiang Zheng
(Shanghai advanced research institute. CAS)
Mr
Yan Wang
(Shanghai Advanced Research Institute)
Kai Xu
(Shanghai Advanced Research Institute, Chinese Academy of Sciences)
Hongtao Hou
(Shanghai Advanced Research Institute, Chinese Academy of Sciences)
