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HK: Fachverband Physik der Hadronen und Kerne
HK 28: Instrumentierung VII
HK 28.3: Talk
Tuesday, March 22, 2011, 17:00–17:15, HS2
Large Angle Spectrometer Trigger at COMPASS — •Nicolas du Fresne von Hohenesche — for the COMPASS collaboration
Institut für Kernphysik Mainz, Johannes-Gutenberg-Universität Johann-Joachim-Becher-Weg 45, 55099 Mainz
The COMPASS collaboration (COmmon Muon Proton Apparatus for Structure and Spectroscopy) studies the structure of the nucleon using a fixed target experiment located at the M2 beam line of the Super Proton Synchrotron at CERN.
To access semi-inclusive events with a momentum transfer around 20 (GeV/c)2 at moderate values of the xBj scaling variable an adequate trigger system is needed. For future data taking programs, such as DVCS and Drell-Yan, a good coverage for large angle scattering is mandatory.
Thus, during 2010 data taking with a transverse polarized target, the new Large Angle Spectrometer Trigger (LAST) was set up, consisting of a pair of hodoscopes exploiting target pointing. First results will be presented on the performance, efficiency and acceptance of this new trigger.