Operation and Performance of the CMS Level-1 Trigger during 7 TeV Collisions

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• 作者：Pamela Klabbers ; for the CMS Collaboration
• 关键词：Trigger ; LHC ; CMS
• 刊名：Physics Procedia
• 出版年：2012
• 出版时间：2012
• 年：2012
• 卷：37
• 期：Complete
• 页码：1908-1916
• 全文大小：3033 K

文摘

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.