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The Trigger for Early Running

The ATLAS trigger and data acquisition system is based on three levels of event selection designed to capture the physics of interest with high efficiency from an initial bunch crossing rate of 40 MHz. The selections in the three trigger levels must provide sufficient rejection to reduce the rate to...

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Autor principal: The ATLAS Collaboration
Lenguaje:eng
Publicado: 2009
Materias:
Acceso en línea:http://cds.cern.ch/record/1167692
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author The ATLAS Collaboration
author_facet The ATLAS Collaboration
author_sort The ATLAS Collaboration
collection CERN
description The ATLAS trigger and data acquisition system is based on three levels of event selection designed to capture the physics of interest with high efficiency from an initial bunch crossing rate of 40 MHz. The selections in the three trigger levels must provide sufficient rejection to reduce the rate to 200 Hz, compatible with offline computing power and storage capacity. The LHC is expected to begin its operation with a peak luminosity of 10^31 with a relatively small number of bunches, but quickly ramp up to higher luminosities by increasing the number of bunches, and thus the overall interaction rate. Decisions must be taken every 25 ns during normal LHC operations at the design luminosity of 10^34, where the average bunch crossing will contain more than 20 interactions. Hence, trigger selections must be deployed that can adapt to the changing beam conditions while preserving the interesting physics and satisfying varying detector requirements. In this paper, we provide a menu of trigger selections that can be deployed during the startup phase at each trigger level and show its evolution to higher luminosities. The studies presented in this paper are based on simulated data.
id cern-1167692
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2009
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spelling cern-11676922021-04-18T19:40:05Zhttp://cds.cern.ch/record/1167692engThe ATLAS CollaborationThe Trigger for Early RunningDetectors and Experimental TechniquesThe ATLAS trigger and data acquisition system is based on three levels of event selection designed to capture the physics of interest with high efficiency from an initial bunch crossing rate of 40 MHz. The selections in the three trigger levels must provide sufficient rejection to reduce the rate to 200 Hz, compatible with offline computing power and storage capacity. The LHC is expected to begin its operation with a peak luminosity of 10^31 with a relatively small number of bunches, but quickly ramp up to higher luminosities by increasing the number of bunches, and thus the overall interaction rate. Decisions must be taken every 25 ns during normal LHC operations at the design luminosity of 10^34, where the average bunch crossing will contain more than 20 interactions. Hence, trigger selections must be deployed that can adapt to the changing beam conditions while preserving the interesting physics and satisfying varying detector requirements. In this paper, we provide a menu of trigger selections that can be deployed during the startup phase at each trigger level and show its evolution to higher luminosities. The studies presented in this paper are based on simulated data.ATL-PHYS-PUB-2009-025ATL-COM-PHYS-2009-124oai:cds.cern.ch:11676922009-03-17
spellingShingle Detectors and Experimental Techniques
The ATLAS Collaboration
The Trigger for Early Running
title The Trigger for Early Running
title_full The Trigger for Early Running
title_fullStr The Trigger for Early Running
title_full_unstemmed The Trigger for Early Running
title_short The Trigger for Early Running
title_sort trigger for early running
topic Detectors and Experimental Techniques
url http://cds.cern.ch/record/1167692
work_keys_str_mv AT theatlascollaboration thetriggerforearlyrunning
AT theatlascollaboration triggerforearlyrunning