The COMPASS trigger system for muon scattering

C. Bernet, A. Bravar, J. Hannappel, D. V. Harrach, R. Hermann, E. Kabuß, F. Klein, A. Korzenev, M. Leberig, M. Ostrick, J. Pretz, R. Windmolders, J. Zhao

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The trigger system of the COMPASS experiment at the CERN polarized muon beam is presented. It detects muon scattering events on (polarized) nucleons with a relative energy loss exceeding a selectable value ymin independent of the four-momentum transfer. The requirement of a minimum energy deposit in a hadron calorimeter rejects background events like scattering on electrons, elastic and quasi-elastic radiative events as well as events from beam halo tracks. The trigger system which can be considered as a tagger for quasi-real photon events is now, along with larger trigger hodoscope system for deep inelastic scattering events, in regular use for the measurement of the gluon polarisation ΔG/G.

Original languageEnglish
Pages (from-to)217-240
Number of pages24
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume550
Issue number1-2
DOIs
StatePublished - Sep 11 2005
Externally publishedYes

Funding

Supported by the Bundesministerium für Bildung und Forschung.

Keywords

  • COMPASS spectrometer
  • Calorimeter
  • Muon beam
  • Polarised deep inelastic lepton scattering
  • Scintillators
  • Trigger

Fingerprint

Dive into the research topics of 'The COMPASS trigger system for muon scattering'. Together they form a unique fingerprint.

Cite this