Machine Protection System Design for the Taiwan Photon Source

A synchrotron light facility, Taiwan Photon Source (TPS), is being constructed at the campus of the NSRRC (National Synchrotron Radiation Research Center). In order to prevent damage to accelerator components induced by various events, design of the global machine protection system (MPS) is on-going. The MPS collects interlock signals and beam dump request from various subsystem, perform decision, transmit dump beam request to RF system. The MPS equipments are distributed on 24 CIAs (Control Instrumentation Areas) include a main PLC (Programmable Logic Controller) with remote I/Os, event receiver, transient capture module responsible for slow-interlock and fast-interlock, sequence events capture. Special input/output patch boards are designed for signal type conversion which is easily connectivity and trouble shooting. To protect the TPS accelerator equipments, the MPS should collect urgent beam dump requests to beam abort devices (most probably is RF system) within short and deterministic latency time (e.g. less than 10 msec). The PLC based system will be used as a slow MPS which can delivery less than 8 msec reaction time. The fast MPS will dependent on event based timing system to deliver response time less than 5 msec. Trigger signal for post-mortem will also be distributed by the fast MPS. To ensure alive of the system, several self-diagnostics mechanisms include heartbeat and transient capture will be implemented. The MPS architecture, plans and implementation were presented in this report.