State-of-the-art developments in accelerator controls at the APS

The performance requirements of the Advanced Photon Source (APS) challenge the control system in a number of areas. This paper reviews a few applications of advanced technology in the control and monitoring of the APS. The application of digital signal processors (DSPs) and techniques are discussed, both from the perspective of a large distributed multiprocessor system and from that of embedded systems. In particular, two embedded applications are highlighted, a beam position monitor processor and a DSP-based power supply controller. Fast data distribution is often a requirement. The application of a high-speed network based on reflective memory is also discussed in the context of the APS global orbit feedback system. Timing systems provide opportunities to apply technologies such as high-speed logic and fiber optics. Examples of the use of these technologies are also included. Finally, every modern accelerator control system of any size requires networking. Features of the APS accelerator controls network are discussed