Intelligent trigger processor for the crystal box
A large solid angle modular NaI(Tl) detector with 432 phototubes and 88 trigger scintillators is being used to search simultaneously for three lepton flavor changing decays of muon. A beam of up to 10/sup 6/ muons stopping per second with a 6% duty factor would yield up to 1000 triggers per second from random triple coincidences. A reduction of the trigger rate to 10 Hz is required from a hardwired primary trigger processor described in this paper. Further reduction to < 1 Hz is achieved by a microprocessor based secondary trigger processor. The primary trigger hardware imposes voter coincidence logic, stringent timing requirements, and a non-adjacency requirement in the trigger scintillators defined by hardwired circuits. Sophisticated geometric requirements are imposed by a PROM-based matrix logic, and energy and vector-momentum cuts are imposed by a hardwired processor using LSI flash ADC's and digital arithmetic loci. The secondary trigger employs four satellite microprocessors to do a sparse data scan, multiplex the data acquisition channels and apply additional event filtering.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Stanford Univ., CA (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6569552
- Report Number(s):
- LA-UR-81-1323; CONF-810539-1; TRN: 81-009481
- Resource Relation:
- Conference: Conference on the application of microprocessors to high energy physics experiments, Geneva, Switzerland, 4 May 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MUON DETECTION
NAI DETECTORS
PERFORMANCE
LEPTONS
MUONS
SCINTILLATION COUNTERS
SWITCHES
CHARGED PARTICLE DETECTION
DETECTION
ELECTRICAL EQUIPMENT
ELEMENTARY PARTICLES
EQUIPMENT
FERMIONS
MEASURING INSTRUMENTS
RADIATION DETECTION
RADIATION DETECTORS
SOLID SCINTILLATION DETECTORS
440104* - Radiation Instrumentation- High Energy Physics Instrumentation