BNL, Upton, Long Island, New York, USA
We present a brief overview of distributed feedback systems based on the RHIC LLRF Platform. The general architecture and sub-system components of a complex feedback system are described, emphasizing the techniques and features employed to achieve deterministic and low latency data and timing delivery between local and remote sub-systems: processors, FPGA fabric components and the high level control system. In particular, we will describe how we make use of the platform to implement a widely distributed multi-processor and FPGA based longitudinal damping system, which relies on task sharing, tight synchronization and integration to achieve the desired functionality and performance.
