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During the data taking period from 2009 until 2012, the ATLAS trigger has been used very successfully to collect proton–proton data at LHC center-of-mass energies between 900GeV and 8TeV. Using custom electronics with input from the calorimeter and muon detectors, the first level rejects most background collisions in less than 2.5μs. Then follow two levels of software-based triggers. The trigger system...
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