Orateur
Description
The CEA Paris-Saclay Irfu is responsible for most of the EPICS control system for the Saraf Linac accelerator. This scope includes the control and the tuning of the beam, the machine protection system (MPS) and the timing system (TMG).
The machine protection system prevents any damage in the accelerator by shutting down the beam in case of detection of risky incidents like interceptive diagnostics in the beam, vacuum or cooling defects. So far, the system has been used successfully up to the MEBT. It will be tested soon for the super conducting Linac consisting of 4 cryomodules and 27 cavities. It relies on three sets: the MRF timing system that is the messenger of the “shut beam” messages coming from any devices, IOxOS MTCA boards with custom FPGA developments that monitor the Section Beam Current Transmission (SBCT) along the accelerator and a Beam Destination Master (BDM) that manages the beam destination required. This Destination Master is based on a master PLC. It permanently monitors Siemens PLCs that are in charge of the “slow” detection for fields such as vacuum, cryogenic and water cooling system.
We have developed a high-level application that can activate a set of subsystems to prepare the accelerator for the desired configuration. This application, called Beam Operation Mode (BOM), transmits and controls the operator requests of beam mode and destination to a set of subsystems. The BDM to check that conditions are good according to the destination. The SBCT must be configured for the desired destinations. The Cavity Phasing system verifies that the cavities are properly conditioned. The TMG network must be monitored and operational. The Max Pulse Width (MPW) application limits the beam power by restricting the pulse width, according to the inserted devices.