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Currently ALS is undergoing an upgrade to ALSU to produce 100 times brightersoft X-ray light. The LLRF system for Accumulator Ring (AR) is composed of twoidentical LLRF stations, for driving RF amplifiers. The closed loop RFamplitude and phase stability is measured as $< 0.1\%$ and $< 0.1^\circ$respectively, using the non-IQ digital down conversion together with analogup/down conversion, under a system-on-chip architecture. Realtime interlocksystem is implemented with $< 2 \mu$s latency, for machine protection againstarc flash and unexpected RF power. Control interfaces are developed to enablePLC-FPGA-EPICS communication to support operation, timing, cavity tuning, andinterlock systems. The LLRF system handles alignment of buckets to swap beamsbetween AR and Storage Ring by synchronous phase loop ramping between the twocavities. The system also includes an optimization routine to characterize theloop dynamics and determine optimal operating point using a built-in networkanalyzer feature. A cavity emulator of 31 kHz bandwidth is integrated with theLLRF system to validate the performance of the overall system being developed.

Digital Low-Level RF control system for Accumulator Ring at Advanced Light Source Upgrade Project