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Level-1 Trigger:
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The ATLAS Level-1 Trigger algorithms are carried out by a Calorimeter Trigger processor (electrons and photons, jets, taus, missing and total transverse energy) and a Muon Trigger processor (high transverse-momentum muons in barrel and endcaps). Logic on the results of these two processors to produce triggers is done by the Central Trigger Processor (CTP). Trigger results, precise timing information, and control signals are distributed to all ATLAS subsystems by the Timing, Trigger and Control (TTC) system. Level-1 must reduce the raw rate of 1 GHz proton-proton interactions and 40 MHz beam-beam bunch crossings to 75 kHz within a total latency including cable delays of 2 µs maximum.

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