Speaker
Description
A Fast Orbit Feedback (FOFB) system is being developed for the SSRF storage ring to suppress beam orbit disturbances and improve beam stability. The system adopts a distributed architecture based on FPGA and EPICS, integrating beam position monitor (BPM) data acquisition, orbit correction computation, and corrector magnet control within a real-time feedback loop. The feedback algorithm is based on the response matrix method. The pseudo-inverse of the response matrix is calculated offline using Singular Value Decomposition (SVD) and loaded into the controller. During operation, orbit deviations measured by BPMs are processed in real time, and the corresponding corrector strengths are calculated through matrix-vector multiplication implemented in FPGA programmable logic. The processing system manages system configuration, diagnostics, and communication with the EPICS control system, while latency-critical computations are executed in dedicated hardware. An EPICS soft IOC and GUI have been developed for system configuration, beam orbit monitoring, and system status monitoring.
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| Supervisor's name | Longwei Lai |
| Supervisor's email | lailw@sari.ac.cn |