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A topological trigger based on the Time-of-Flight detector for the ALICE experiment

Authors
Journal
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
0168-9002
Publisher
Elsevier
Publication Date
Volume
602
Issue
2
Identifiers
DOI: 10.1016/j.nima.2008.12.016
Keywords
  • Trigger
  • Tof
  • Heavy Ion
  • Mrpc
  • Fpga
Disciplines
  • Mathematics

Abstract

Abstract The goal of the ALICE Time-of-Flight detector, based on MRPC technology, is to perform the charged-particle identification at midrapidity, in the region | η|<0.9. This large area (∼150 m 2), finely segmented detector (∼157,000 channels), provides fast signals which will contribute to the Level 0 and Level 1 trigger decisions. We use the TOF detector information to perform an online estimate of the total track multiplicity and to identify simple and peculiar topologies, like those produced by minimum bias p–p, Ultra Peripheral ion–ion collisions and cosmic muons. The system architecture foresees a first layer of 72 VME boards interfacing the detector front-end to a second layer, which receives and processes all the information and takes trigger decisions.

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