MUON TRIGGER GROUP

The muon trigger group is (as the name implies) concerned with the construction, maintenance and running of the trigger system of the COMAPSS experiment, mainly for the muon program.

Purpose of this page

The purpose of this page is to give an access point to the available documentation of the trigger system, in the section "Downloads of trigger related documentation" you can find the public documentaion, the most interesting part there is "The trigger paper" as published in NIM A.

The section "Details of the trigger system" contains some more detailed documents and internals, acces thereto is therefore restricted to collaboration members.

Downloads of trigger related documentation

• The Trigger Paper:

  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 [Delta]G/G.

  C. Bernet, A. Bravar, J. Hannappel, D.v. Harrach, R. Hermann, E. Kabuß, F. Klein, A. Korzenev, M. Leberig, M. Ostrick et al.,
  The COMPASS trigger system for muon scattering,
  Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 550, Issues 1-2, , 11 September 2005, Pages 217-240.

  Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 550, Issues 1-2, , 11 September 2005, Pages 217-240. (LOCAL)

• An extensive documentation of the Muon trigger system, covering concept, hardware, electronics and studies performed so far.

  Available as PostScript version (2.6 MB), as compressed version (0.7 MB) and as pdf version (0.8 MB).

  Updated HO04 design (implemented since beginning of 2010). Updated Veto Inner 2 design (implemented since 2006).

• A detailed description of the calorimetric part of the trigger system is available as compressed Postscript version (still: 4.8 MB)

• A short note about veto geometries and suppresion factors available as PostScript version (0.13 MB)

• A short note about acceptance of the different hodoscope systems as PostScript version (0.39 MB)

• Talk given by M. Leberig at DIS2002 with the title "Status of the COMPASS experiment" compressed PostScript version (2.94 MB)

• Proceeding article of DIS2002 published as: M. Leberig, Acta Physica Polonica B 33/10 (2002) 3707 Title "Status of the COMPASS experiment". compressed PostScript version (0.15 MB)

• PHD Thesis by M. Leberig "Das COMPASS-Triggersystem zur Messung des Gluonbeitrags zum Protonspin" (submitted version, language: german). compressed PostScript version (8.7 MB)

• Diploma Thesis by R.Hermann "Entwicklung eines LED-Pulsersystems zur Kalibrierung des Triggers im COMPASS Experiment" (submitted version, language: german). compressed PostScript version (6.3 MB)

List of the Trigger Group members

Details of the trigger system

This page was updated on May 6th, 2006
by Local Webmaster