HAL : in2p3-00260521, version 1
 International Conference on Computing in High Energy and Nuclear Physics (CHEP-07), Victoria : Canada (2007)
 The ATLAS Trigger - Commissioning with cosmic rays
 ATLAS Collaboration(s)
 (2008)
 The ATLAS detector at CERN's LHC will be exposed to proton-proton collisions from beams crossing at 40 MHz. At the design luminosity there are roughly 23 collisions per bunch crossing. ATLAS has designed a three-level trigger system to select potentially interesting events. The first-level trigger, implemented in custom-built electronics, reduces the incoming rate to less than 100 kHz with a total latency of less than 2.5$\mu$s. The next two trigger levels run in software on commercial PC farms. They reduce the output rate to 100-200 Hz. In preparation for collision data-taking which is scheduled to commence in May 2008, several cosmic-ray commissioning runs have been performed. Among the first sub-detectors available for commissioning runs are parts of the barrel muon detector including the RPC detectors that are used in the first-level trigger. Data have been taken with a full slice of the muon trigger and readout chain, from the detectors in one sector of the RPC system, to the second-level trigger algorithms and the data-acquisition system. The system is being prepared to include the inner-tracking detector in the readout and second-level trigger. We will present the status and results of these cosmic-ray based commissioning activities. This work will prove to be invaluable not only during the commissioning phase but also for cosmic-ray data-taking during the normal running for detector performance studies.
 Thème(s) : Physique/Physique/Instrumentations et Détecteurs
 Lien vers le texte intégral : http://cdsweb.cern.ch/record/1057779
 in2p3-00260521, version 1 http://hal.in2p3.fr/in2p3-00260521 oai:hal.in2p3.fr:in2p3-00260521 Contributeur : Nicole Berger <> Soumis le : Mardi 4 Mars 2008, 13:49:24 Dernière modification le : Mercredi 7 Janvier 2009, 11:08:48