9-15 June 2018
Woodlands Conference Center
America/New_York timezone
**** See you at Real Time 2020 ****

Overview and performance of the ATLAS Level-1 Topological Trigger

12 Jun 2018, 14:40
1h 30m
Woodlands Conference Center

Woodlands Conference Center

159 Visitor Center Dr, Williamsburg, VA 23185
Poster presentation Trigger Systems Poster 1

Speaker

Johannes Frederic Damp (Johannes Gutenberg Universitaet Mainz (DE))

Description

In 2017 the LHC provided proton-proton collisions to the ATLAS experiment with high luminosity (up to 2.06x10^34), placing stringent operational and physical requirements on the ATLAS trigger system in order to reduce the 40 MHz collision rate to a manageable event storage rate of 1 kHz, while not rejecting interesting physics events. 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 μs. An important role is played by its newly commissioned component: the L1 topological trigger (L1Topo). This innovative system consists of two blades designed in AdvancedTCA form factor, mounting four individual state-of-the-art processors, and providing high input bandwidth and low latency data processing. Up to 128 topological trigger algorithms can be implemented to select interesting events by applying kinematic and angular requirements on electromagnetic clusters, jets, muons and total energy. This results in a significantly improved background event rejection and improved acceptance of physics signal events, despite the increasing luminosity. This is becoming more and more important for analyses making use of low pT objects, like the Heavy Flavour and Higgs physics programme.
In this talk, an overview of the L1Topo architecture, simulation and performance results in physics analyses is presented.

Institute CERN
Speaker ATLAS
Country Switzerland
Minioral Yes
Description system trigger

Primary author

Johannes Frederic Damp (Johannes Gutenberg Universitaet Mainz (DE))

Presentation Materials

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