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The Run-2 ATLAS Trigger System
The ATLAS trigger successfully collected collision data during the first run of the LHC between 2009-2013 at different centre-of-mass energies between 900 GeV and 8 TeV. The trigger system consists of a hardware Level-1 and a software-based high level trigger (HLT) that reduces the event rate from t...
Autores principales: | , |
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Lenguaje: | eng |
Publicado: |
2016
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1088/1742-6596/762/1/012003 http://cds.cern.ch/record/2133909 |
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author | Ruiz-Martinez, Aranzazu ATLAS Collaboration |
author_facet | Ruiz-Martinez, Aranzazu ATLAS Collaboration |
author_sort | Ruiz-Martinez, Aranzazu |
collection | CERN |
description | The ATLAS trigger successfully collected collision data during the first run of the LHC between 2009-2013 at different centre-of-mass energies between 900 GeV and 8 TeV. The trigger system consists of a hardware Level-1 and a software-based high level trigger (HLT) that reduces the event rate from the design bunch-crossing rate of 40 MHz to an average recording rate of a few hundred Hz. In Run-2, the LHC will operate at centre-of-mass energies of 13 and 14 TeV and higher luminosity, resulting in roughly five times higher trigger rates. A brief review of the ATLAS trigger system upgrades that were implemented between Run-1 and Run-2, allowing to cope with the increased trigger rates while maintaining or even improving the efficiency to select physics processes of interest, will be given. This includes changes to the Level-1 calorimeter and muon trigger systems, the introduction of a new Level-1 topological trigger module and the merging of the previously two-level HLT system into a single event filter farm. A few examples will be shown, such as the impressive performance improvements in the HLT trigger algorithms used to identify leptons, hadrons and global event quantities like missing transverse energy. Finally, the status of the commissioning of the trigger system and its performance during the 2015 run will be presented. |
id | cern-2133909 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2016 |
record_format | invenio |
spelling | cern-21339092019-09-30T06:29:59Zdoi:10.1088/1742-6596/762/1/012003http://cds.cern.ch/record/2133909engRuiz-Martinez, AranzazuATLAS CollaborationThe Run-2 ATLAS Trigger SystemDetectors and Experimental TechniquesThe ATLAS trigger successfully collected collision data during the first run of the LHC between 2009-2013 at different centre-of-mass energies between 900 GeV and 8 TeV. The trigger system consists of a hardware Level-1 and a software-based high level trigger (HLT) that reduces the event rate from the design bunch-crossing rate of 40 MHz to an average recording rate of a few hundred Hz. In Run-2, the LHC will operate at centre-of-mass energies of 13 and 14 TeV and higher luminosity, resulting in roughly five times higher trigger rates. A brief review of the ATLAS trigger system upgrades that were implemented between Run-1 and Run-2, allowing to cope with the increased trigger rates while maintaining or even improving the efficiency to select physics processes of interest, will be given. This includes changes to the Level-1 calorimeter and muon trigger systems, the introduction of a new Level-1 topological trigger module and the merging of the previously two-level HLT system into a single event filter farm. A few examples will be shown, such as the impressive performance improvements in the HLT trigger algorithms used to identify leptons, hadrons and global event quantities like missing transverse energy. Finally, the status of the commissioning of the trigger system and its performance during the 2015 run will be presented.ATL-DAQ-PROC-2016-003oai:cds.cern.ch:21339092016-02-24 |
spellingShingle | Detectors and Experimental Techniques Ruiz-Martinez, Aranzazu ATLAS Collaboration The Run-2 ATLAS Trigger System |
title | The Run-2 ATLAS Trigger System |
title_full | The Run-2 ATLAS Trigger System |
title_fullStr | The Run-2 ATLAS Trigger System |
title_full_unstemmed | The Run-2 ATLAS Trigger System |
title_short | The Run-2 ATLAS Trigger System |
title_sort | run-2 atlas trigger system |
topic | Detectors and Experimental Techniques |
url | https://dx.doi.org/10.1088/1742-6596/762/1/012003 http://cds.cern.ch/record/2133909 |
work_keys_str_mv | AT ruizmartinezaranzazu therun2atlastriggersystem AT atlascollaboration therun2atlastriggersystem AT ruizmartinezaranzazu run2atlastriggersystem AT atlascollaboration run2atlastriggersystem |