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An overview of the first and second leveltrigger of Delphi

Conference · · IEEE Trans. Nucl. Sci.; (United States)
OSTI ID:6330424
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Delphi is one of the experiments at the Large Electron Positron (LEP) collider being constructed at CERN. The technical proposal provides a general description of the experiment. The Delphi trigger is organized in four levels. The first two triggers are synchronous with the Beam Cross-Over, every 22..mu..s, and are implemented in hardware. The first level trigger decision is taken at 3..mu..s and is used primarily as a fast trigger to gate the Time Projection Chamber. Gating this detector off on rejected events reduces space charge build up. If the first level decision is positive the following Beam Cross-Over will be lost to allow the inclusion of data from long drift time detectors in the second level trigger. The second level decision is taken at 39..mu..s. If this decision is positive a front-end readout is initiated and up to 500..mu..s is required to free the front end buffers. To limit the deadtime fraction for each trigger to the order of 2% the first level trigger rate has to be held to 1Khz and the second level rate to 20Hz.

Research Organization:
Rutherford Appleton Lab., Chilton, Didcot (GB); INFN, Instituto Superiore di Sanita, Roma (IT); EP Division, CERN, Geneva (CH); Stockholms Univ., Fysika Institutionsgruppen, Stockholm (SE); Dipartimento di Fisica, Universita di Trieste, Trieste (IT)
OSTI ID:
6330424
Report Number(s):
CONF-881103-
Journal Information:
IEEE Trans. Nucl. Sci.; (United States), Journal Name: IEEE Trans. Nucl. Sci.; (United States) Vol. 36:1; ISSN IETNA
Country of Publication:
United States
Language:
English

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Related Subjects

43 PARTICLE ACCELERATORS
430400 -- Particle Accelerators-- Storage Rings
440104* -- Radiation Instrumentation-- High Energy Physics Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCELERATOR FACILITIES
ACCELERATORS
BEAM DYNAMICS
CERN
COMPUTER CODES
EXPERIMENT PLANNING
GAS TRACK DETECTORS
HIGH ENERGY PHYSICS
INTERNATIONAL ORGANIZATIONS
LEP STORAGE RINGS
LINEAR ACCELERATORS
MEASURING INSTRUMENTS
PERFORMANCE
PHYSICS
PLANNING
PROJECTION SPARK CHAMBERS
RADIATION DETECTORS
SPARK CHAMBERS
STANFORD LINEAR COLLIDER
STORAGE RINGS