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The ATLAS trigger system is based on three levels of event selection that selects the physics of interest from an initial bunch crossing rate of 40MHz to an output rate of ~200Hz compatible with the offline computing power and storage capacity. During nominal LHC operations at a luminosity of 1034cm-2s-1, decisions must be taken every 25ns.The LHC is expected to begin operations with a peak luminosity...
The ATLAS combined test beam in the second half of 2004 saw the first deployment of the ATLAS high-level triggers (HLT). The next steps are deployment on the pre-series farms in the experimental area during 2005, commissioning and cosmics tests in 2006 and collisions in 2007. This paper reviews the experience gained in the test beam, describes the current status and discusses the further enhancements...
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