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A Multi-processor Camac-based On-line System For The Ps 199 Experiment

The Data Acquisition System for the PS 199 experiment is described. It is based on CAMAC modules with three J11 Starburst pmessors used for parallel event reduction and event building. A MicroVAX I1 and two Vaxstations perform the run control and monitoring. A PC takes care of the laser calibration. pick-up strips to measure the x and y coordinates, for a total of about 14000 channels. The scintillator counters are mainly for trigger purposes. They are also used to reject, by means of time-of-flight, the photons escaping the veto box around the target. The neutron detectors are three scintillator hodoscopes made of 19,24, 10 vertical bars respectively. Both the ANC and the NC scintillators are viewed by photomultipliers at both ends.