Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Ruiz-Martinez, Aranzazu, ATLAS Collaboration
Lenguaje:eng
Publicado: 2016
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1742-6596/762/1/012003
http://cds.cern.ch/record/2133909
_version_ 1780949867305107456
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