Design and commissioning of the upgraded ALS SR RF cavity water control system

The Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory, a pioneering third-generation synchrotron light source, has been operational since 1992. The ALS storage ring RF cavity water control system, originally a 30-year-old relay-based chassis system, regulated the temperature of the two storage ring RF cavities while managing interlocks and operational functions. Aging instrumentation and the need for enhanced features, however, led to operational challenges. To address these issues, the system was upgraded to a PLC-based solution. This paper presents the design and commissioning results of the upgraded cavity water control system.