Abstract
The Mark-III is a third generation solenoidal magnetic detector designed for investigation of the production and decay of particles at 3 to 5 GeV center of mass energy. It is located at the SPEAR electron-position storage ring at Stanford University. Information from events consists of signal times and areas from each of the elements of the detector: the tracking drift chamber, time-of-flight scintillation counters, an electromagnetic shower calorimeter, and single-wire proportional tube muon detectors. The function of the trigger is to select interesting events in a bias free manner while efficiently rejecting backgrounds. It does this by finding tracks made by charged particles coming from the interaction region, where the electrons and positrons collide.
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