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Description
The Accumulator Ring (AR), a key component of the Advanced Light Source Upgrade (ALS-U) project at Lawrence Berkeley National Laboratory (LBNL), is currently under installation and scheduled for commissioning with beam after the 2026 summer shutdown. To support safe commissioning and eventual routine operation, the Personnel Protection Systems (PPS) team is developing a Beam Charge Monitoring Interlock System (BCMIS). The BCMIS is designed to ensure that operation of the accelerator remains within the defined limits of the ALS Accelerator Safety Envelope (ASE). It will provide critical interlock functionality by monitoring beam charge levels and triggering protective actions if thresholds are exceeded. Besides that, BCMIS will be the first safety-rated, PLC-based system developed by the PPS team and integrated into the existing relay-based ALS safety infrastructure. This paper presents the high-level requirements, key assumptions and preliminary design for BCMIS.
