The control system for the MIRI imager Ground Support Equipment

The Mid Infra Red Instrument (MIRI) is one of three instr uments to be built for the spatial telescope James Webb (JWST). Our division CEA Saclay/Dapnia is in charge of designing and delivering the imager of MIRI and developing its test bench cal led the Ground Support Equipment (GSE). This GSE is composed of a warm telescope simulator, a cryostat and an infrared detector. This paper will describe the control system for the GSE. This contro l system is composed of a fast acquisition system, a slow control and PLC’s for the cryostat i ncluding safety management. For the fast acquisition and images visualisation, the ESO data acquisi tion software IRACE (InfraRed Array Control Electronics) is used. The originality of this project lies in the simultaneous use of IRACE, of EPICS for the slow control and of the automatisms system based on the WoldFIP Fieldbus network and its WEB supervision. These three software subsystems will communicate and the supervision will be centralized on two redhat Linux PCs. All the boards are purely indu strial. This test bench should be put in operation at the beginning of 2006.