REVIEW OF THE APS SR RF SYSTEMS

The Advanced Photon Source (APS) is a 7-GeV full en- ergy storage ring (SR) for generating synchrotron radiation with an injector. The storage ring cavities consist of four groups of four single cells powered by up to four 1-MW klystrons for up to 300-mA operation. A review of the operation of the rf system as well as rf-related beam dy- namics is presented (1). This review includes rf power distribution, low-level feedback, control law, beam load- ing, beam instabilities, higher-order modes, and beam- induced multipactoring.