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14th IEEE-NPSS Real Time Conference, 2005.
ATLAS is a multi-purpose particle physics detector at CERN's Large Hadron Collider where two pulsed beams of protons are brought to collision at very high energy. There are collisions every 25 ns, corresponding to a rate of 40 MHz. A three-level trigger system reduces this rate to about 200 Hz while keeping bunch crossings which potentially contain interesting processes. The Level-1 trigger, implemented in electronics and firmware, makes an initial selection in under 2.5 ¥ s with an output ratedoi:10.1109/rtc.2005.1547406 fatcat:xgonpzipobc23jkyh5sasoozm4