Operation And Performance Of The Cms Level-1 Trigger During 7 Tev Collisions Pamela Klabbers For The Cms Collaboration
PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON TECHNOLOGY AND INSTRUMENTATION IN PARTICLE PHYSICS (TIPP 2011)(2012)
摘要
The Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) has been collecting data at center-of-mass energy 7 TeV since March 2010. CMS detects the products of LHC proton beams colliding at a rate of 40 MHz. The Level-1 trigger reduces this collision rate to an output rate of 100 kHz, which is forwarded to the High-Level trigger, a dedicated computer farm, which reduces that further to a rate of a few hundreds of Hz, suitable for storage of full event data. The Level-1 trigger uses high-speed custom electronics to combine information from electromagnetic and hadronic calorimeters and three muon detection systems and identifies potential physics objects of interest in only a few microseconds. To ensure good performance of the Level-1 trigger hardware, robust configuration and monitoring software is also required. The talk and these proceedings concentrate on the performance of the Level-1 trigger in the 2010 and on-going 2011 collision runs, as well as presenting an overall picture of the hardware and operation. (C) 2012 Published by Elsevier B.V. Selection and/or peer review under responsibility of the organizing committee for TIPP 11.
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关键词
Trigger, LHC, CMS
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