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We have commissioned the digital Low Level RF (LLRF) system for storage ringRF at Advanced Light Source at Lawrence Berkeley National Lab (LBNL). Thesystem is composed of 42 synchronous sampling channels for feedback control,diagnostics, and interlocks. The closed loop RF amplitude and phase stabilityis measured as < 0.1% and < 0.1 degree respectively, and the real-time machineprotection interlock latency is measured < 2.5 microsecond. We have alsodeveloped PLC-FPGA-EPICS interfaces to support system configurations betweenhybrid operation modes using two klystrons driving two RF cavities at 500MHzresonance frequency. The deployed LLRF system has been operating since March2017.

Digital Low-Level RF control system for Advanced Light Source Storage Ring