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

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arxiv 1910.07175 v2 pith:LDAHDCWU submitted 2019-10-16 physics.acc-ph

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

classification physics.acc-ph
keywords systemadvancedcontroldigitallightllrfmeasuredring
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have commissioned the digital Low Level RF (LLRF) system for storage ring RF at Advanced Light Source at Lawrence Berkeley National Lab (LBNL). The system is composed of 42 synchronous sampling channels for feedback control, diagnostics, and interlocks. The closed loop RF amplitude and phase stability is measured as < 0.1% and < 0.1 degree respectively, and the real-time machine protection interlock latency is measured < 2.5 microsecond. We have also developed PLC-FPGA-EPICS interfaces to support system configurations between hybrid operation modes using two klystrons driving two RF cavities at 500MHz resonance frequency. The deployed LLRF system has been operating since March 2017.

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