THE JET FAST CENTRAL ACQUISITION AND TRIGGER SYSTEM

This paper describes a new data acquisition system at JET which uses T exas TMS320C40 parallel digital signal processors and the HELIOS paral lel operating system to reduce the large amounts of experimental data produced by fast diagnostics. This unified system features a two level trigger system which performs real-time activity detection together w ith asynchronous event classification and selection. This provides aut omated data reduction during an experiment The system's application to future fusion machines which have almost continuous operation is disc ussed.