Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (10): 100101-100101.doi: 10.11889/j.0253-3219.2015.hjs.38.100101


Storage ring beam orbit interlock system upgrade for SSRF

GENG Helong1 LENG Yongbin2 ZHOU Weimin2 LAI Longwei2 SHEN Tong2 YAN Yingbing2   

  1. 1(Kunming Shipbone Equipment Research and Test Center, Kunming 650051, China) 2(Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China)
  • Received:2015-06-26 Revised:2015-07-27 Online:2015-10-10 Published:2015-10-14

Abstract: Background: Required by machine malfunction analysis, the beam orbit interlock system for the storage ring needs to be upgraded at the Shanghai Synchrotron Radiation Facility (SSRF). Purpose: This study aims to implement an upgraded new interlock system that can label 140 interlock signals coming from different Beam Position Monitor (BPM) electronics and record all data in the new system. And the turn-by-turn data in the BPM electronics Post Mortem buffer will be latched whenever the interlock occurs. Methods: The interlock signals and the latch signals were transmitted through the optical fiber and processed in an NI PXI 7813R Field Programmable Gate Array (FPGA) board. NI PXI-8106 controller is configured to run Linux operation system for Input/Output Controller (IOC) of Experimental Physics and Industrial Control System (EPICS) and communicate with PXI 7813R board which processes all interlock signals. Results: All interlock signal processing and latched trigger signal output were achieved in the FPGA board. The new system was fully integrated to the main EPICS for the storage ring. And the system runs as expected. Conclusions: The online test data show that the new system can detect the first interlock signal caused by the machine abnormality while the turn-by-turn data are latched. The analysis of turn-by-turn data shows the first BPM electronics which sends the interlock signal. The result is consistent with the FPGA board. Meanwhile, beam orbit changes were observed during beam abortions.

Key words: SSRF, Beam diagnostics system, Beam orbit interlock, FPGA