APS Storage Ring Monopulse RF BPM Upgrade

The Advanced Photon Source (APS) is a third‐generation synchrotron light source in its ninth year of operation. The storage ring monopulse radio frequency (rf) beam position monitor (BPM) was designed to measure single‐turn and multi‐turn beam positions for operations and machine physics studies. Many of the components used in the original design are obsolete and costly to replace. In this paper we present a proposal to upgrade the monopulse rf BPMs in which the existing system hardware is repartitioned and the aging data acquisition system is replaced. By replacing only the data acquisition system, we will demonstrate a cost‐effective approach to improved beam stability, reliability, and enhanced postmortem capabilities. An eight‐channel ADC/digitizer VXI board with sampling rate of up to 105 MHz (per channel) and 14‐bit resolution coupled with a field‐programmable gate array and embedded central processing will provide the flexibility to revitalize this system for another decade of operation. We will di...