Commissioning of the ATLAS Level-1 Trigger with Cosmic Rays

Details Commissioning of the ATLAS Level-1 Trigger with Cosmic Rays Commissioning of the ATLAS Level-1 Trigger with Cosmic Rays

2007-11-06

arxiv.org/abs/0711.0938v1

J.Phys.Conf.Ser.110:092023,2008

Physics

Instrumentation and Detectors

On behalf of the ATLAS TDAQ Level-1 Trigger Group. Proceedings for 2007 Europhysics Conference on High Energy Physics, Manches

Scientific paper

10.1088/1742-6596/110/9/092023

The ATLAS detector at CERN's Large Hadron Collider will be exposed to proton-proton collisions from beams crossing at 40 MHz. A three-level trigger system was designed to select potentially interesting events and reduce the incoming rate to 100-200 Hz. The first trigger level (LVL1) is implemented in custom-built electronics, the second and third trigger levels are realized in software. Based on calorimeter information and hits in dedicated muon-trigger detectors, the LVL1 decision is made by the central-trigger processor yielding an output rate of less than 100 kHz. The allowed latency for the trigger decision at this stage is less than 2.5 microseconds. Installation of the final LVL1 trigger system at the ATLAS site is in full swing, to be completed later this year. We present a status report of the main components of the first-level trigger and the in-situ commissioning of the full trigger chain with cosmic-ray muons.

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