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CERN Accelerating science

ATLAS Slides
Report number ATL-DAQ-SLIDE-2016-458
Title Physics performances with the new ATLAS Level-1 Topological trigger in the LHC High-Luminosity Era
Author(s) Artz, Sebastian (Institut fuer Physik, Universitaet Mainz)
Corporate author(s) The ATLAS collaboration
Collaboration ATLAS Collaboration
Submitted to 4th Conference on Large Hadron Collider Physics 2016 (LHCP 2016), Lund, Sweden, 13 - 18 Jun 2016
Submitted by sebastian.artz@cern.ch on 11 Aug 2016
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords L1Topo ; trigger ; topological trigger
Abstract The ATLAS trigger system aim at reducing the 40 MHz protons collision event rate to a manageable event storage rate of 1 kHz, preserving events with valuable physics meaning. The Level-1 trigger is the first rate-reducing step in the ATLAS trigger system, with an output rate of 100 kHz and decision latency of less than 2.5 micro seconds. It is composed of the calorimeter trigger, muon trigger and central trigger processor. During the last upgrade, a new electronics element was introduced to Level-1: L1Topo, the Topological Processor System. It will make it possible to use detailed realtime information from the Level-1 calorimeter and muon triggers, processed in individual state of the art FPGA processors to determine angles between jets and/or leptons and calculate kinematic variables based on lists of selected/sorted objects. Over hundred VHDL algorithms are producing trigger outputs to be incorporated into the central trigger processor. Such information will be essential to improve background rejection and increase the significance of a large spectrum of the ATLAS physics measurements. An overview of the firmware implementation, algorithms performance and their impact over physics results will be illustrated.



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