FPGA-based storage ring beam orbit interlock system design

The beam orbit interlock system is one of the most important components of the machine protection system (MPS) of Shanghai Synchrotron Radiation Facility(SSRF). The daily research asks for recording the interlock signal coming from different Libera BPM in the beam position measurement system, and lathing turn by turn data in Post Mortem buffer in Libera electronics when interlock occurs. This will be helpful to distinguish mistaken interlock signal and improve the stability of the accelerator. In our system, we use NI PXI-7813R DAQ equipment based on FPGA to achieve these functions. This system will be integrated to EPICS control system. The laboratory test results show that the system is able to distinguish the simulated interlock signal in the range of tens of nanoseconds, and output specific trigger signal to the corresponding Libera electronics, which prove that the system meets the designed requirements.