The development of beam current monitors in the APS

Abstract

The Advanced Photon Source (APS) is a third-generation 7-GeV synchrotron radiation source. The precision measurement of beam current is a challenging task in high energy accelerators, such as the APS, with a wide range of beam parameters and complicated noise, radiation, and thermal environments. The beam pukes in the APS injector and storage ring have charge ranging from 5OpC to 25nC with pulse durations varying from 30ps to 3011s. A total of nine non-intercepting beam current monitors have been installed in the APS facility (excluding those in the linac) for general current measurement. In addition, several independent current monitors with specially designed redundant interlock electronics are installed for personnel safety and machine protection. This paper documents the design and development of current monitors in the APS, discusses the commissioning experience in the past year, and presents the results of recent operations.

Commissioning results of the APS storage ring diagnostics systems

“…Monitoring of the currentkharge in the transport lines and injector rings is generally based on the use of fast current transforniers (FCTs) manufactured by Bergoz, shielded housings, and in-house electronics (6). In the storage ring a Bergoz parametric current transformer (PCT) Model PCT-S-175 is the basis of the DC current measurement.…”