Access control and interlock system at the Advanced Photon Source

Abstract

The Advanced Photon Source ( U S ) consists of a linac, position accumulator ring (PAR), booster synchrotron, storage ring, and up to 70 experimental beamlines. The Access Control and Interlock System (ACIS) utilizes redundant programmable logic controllers (PLCs) and a third hard-wired chain to protect personnel from prompt radiation generated by the linac, PAR, synchrotron, and storage ring. This paper describes the ACIS's design philosophy, configuration, hardware, functionality, validation requirements, and operational experience.

The Linac Extension Area at the Advanced Photon Source

“…The room is fully-enclosed, with entry through a vestibule. A laser safety system is installed which is capable of interfacing directly with the APS Access Control and Interlock System (ACIS) [28]. This interoperability allows the future possibility of providing laser beams to the LEA enclosure with safe control of laser hazards.…”

“…The ACIS is used across accelerators at the APS to control and facilitate access to the accelerator enclosures [28]. The ACIS is a personnel safety system employing programmable logic controllers to monitor inputs such as door switches and control accelerator equipment.…”