The Split Field Magnet Detector at the CERN ISR has been used in recent years to study events wit... more The Split Field Magnet Detector at the CERN ISR has been used in recent years to study events with a high tranvserse momentum charged particle. As a first level computer based trigger a linear estimate of the track momentum by fixed point arithmethic was calculated on-line by a minicomputer. In addition appreciable further rejection was obtained by off-line filtering on the IBM-370/168, using pattern recognition and a fit of the triggering particle in the magnetic field. The availability of the 168/E emulator makes it possible to transfer the proven methods used off-line to real time data reduction. Preliminary results on filter efficiency and speed for an experiment triggering on a high pj hadron at 10 to 20° with respect to the outgoing beam (Exp. R419) are given. Possible improvements and extensions are discussed.
The Split Field Magnet Detector at the CERN ISR has been used in recent years to study events wit... more The Split Field Magnet Detector at the CERN ISR has been used in recent years to study events with a high tranvserse momentum charged particle. As a first level computer based trigger a linear estimate of the track momentum by fixed point arithmethic was calculated on-line by a minicomputer. In addition appreciable further rejection was obtained by off-line filtering on the IBM-370/168, using pattern recognition and a fit of the triggering particle in the magnetic field. The availability of the 168/E emulator makes it possible to transfer the proven methods used off-line to real time data reduction. Preliminary results on filter efficiency and speed for an experiment triggering on a high pj hadron at 10 to 20° with respect to the outgoing beam (Exp. R419) are given. Possible improvements and extensions are discussed.
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