L. Antoniazzi et al., FNAL E771 FAST MUON TRIGGER, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 355(2-3), 1995, pp. 320-328
A fast first level muon trigger, developed for and used in experiment
E771 at Fermilab, for selecting events containing high energy muons, i
s described. The trigger finds events by matching the hits information
received from three planes of resistive plate counters. The entire pr
ocess, accomplished within 450 ns, reduces the total interaction rate
by a factor of similar to 10(2) for the single muon trigger and a fact
or of similar to 10(4) for the dimuon trigger. The trigger logic is pr
ogrammable, and it allows for an optimization of the signal to backgro
und ratio. The capability and performances of the trigger system are a
lso described.