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Development of a Concept for the Muon Trigger of the ATLAS Detector at the HL-LHC

Highly selective first level triggers are essential to exploit the full physics potential of the ATLAS experiment at the High Luminosity-Large Hadron Collider, where the instantaneous luminosity will exceed the LHC Run 1 instantaneous luminosity by almost an order of magnitude. The ATLAS experiment...

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Autor principal: Gadow, Paul Philipp
Lenguaje:eng
Publicado: 2016
Materias:
Acceso en línea:http://cds.cern.ch/record/2162398
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author Gadow, Paul Philipp
author_facet Gadow, Paul Philipp
author_sort Gadow, Paul Philipp
collection CERN
description Highly selective first level triggers are essential to exploit the full physics potential of the ATLAS experiment at the High Luminosity-Large Hadron Collider, where the instantaneous luminosity will exceed the LHC Run 1 instantaneous luminosity by almost an order of magnitude. The ATLAS experiment plans to increase the rate of the first trigger level to 1 MHz at 6 µs latency. The momentum resolution of the existing first level muon trigger is limited by the moderate position resolution of the trigger chambers. Including the data of the precision Monitored Drift Tube (MDT) chambers in the first level muon trigger decision will increase the selectivity of the first level muon trigger substantially. Run 1 LHC data with a centre-of-mass energy of $\sqrt{s} = 8\, \textrm{TeV}$ and a bunch spacing of 25 ns was used to study the achievable selectivity of a muon trigger making use of the MDT data. It could be shown that it is not necessary to fully reconstruct the muon trajectory. The position and direction information of the straight track segments reconstructed in the MDT chambers is sufficient to measure the momentum with a precision that allows for a rate reduction compared to the expected Phase-I trigger rate of over 70 % for the whole ATLAS muon spectrometer. Fast algorithms employed in the trigger electronics are required for the reconstruction of the track segments within the trigger latency. For the end-cap ($1.05 < |\eta| < 2.4$) the ATLAS collaboration considered a 1-dimensional Hough transform algorithm, which is seeded by the trigger chamber data. The algorithm is not applicable in the barrel region ($0 < |\eta| < 1.05$) because of the lower spatial resolution of the trigger chambers in the barrel region than in the end-cap region. Extending the algorithm to a Binned 2D-Hough Transform, which improves the track segment reconstruction quality sufficiently for all regions apart from the outer barrel MDT chambers. In this thesis, a new track segment finding algorithm, that makes use of tangents to drift radii, was developed and shown to be applicable to the entire muon spectrometer ($ |\eta| < 2.4$).
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spelling cern-21623982019-09-30T06:29:59Zhttp://cds.cern.ch/record/2162398engGadow, Paul PhilippDevelopment of a Concept for the Muon Trigger of the ATLAS Detector at the HL-LHCDetectors and Experimental TechniquesHighly selective first level triggers are essential to exploit the full physics potential of the ATLAS experiment at the High Luminosity-Large Hadron Collider, where the instantaneous luminosity will exceed the LHC Run 1 instantaneous luminosity by almost an order of magnitude. The ATLAS experiment plans to increase the rate of the first trigger level to 1 MHz at 6 µs latency. The momentum resolution of the existing first level muon trigger is limited by the moderate position resolution of the trigger chambers. Including the data of the precision Monitored Drift Tube (MDT) chambers in the first level muon trigger decision will increase the selectivity of the first level muon trigger substantially. Run 1 LHC data with a centre-of-mass energy of $\sqrt{s} = 8\, \textrm{TeV}$ and a bunch spacing of 25 ns was used to study the achievable selectivity of a muon trigger making use of the MDT data. It could be shown that it is not necessary to fully reconstruct the muon trajectory. The position and direction information of the straight track segments reconstructed in the MDT chambers is sufficient to measure the momentum with a precision that allows for a rate reduction compared to the expected Phase-I trigger rate of over 70 % for the whole ATLAS muon spectrometer. Fast algorithms employed in the trigger electronics are required for the reconstruction of the track segments within the trigger latency. For the end-cap ($1.05 < |\eta| < 2.4$) the ATLAS collaboration considered a 1-dimensional Hough transform algorithm, which is seeded by the trigger chamber data. The algorithm is not applicable in the barrel region ($0 < |\eta| < 1.05$) because of the lower spatial resolution of the trigger chambers in the barrel region than in the end-cap region. Extending the algorithm to a Binned 2D-Hough Transform, which improves the track segment reconstruction quality sufficiently for all regions apart from the outer barrel MDT chambers. In this thesis, a new track segment finding algorithm, that makes use of tangents to drift radii, was developed and shown to be applicable to the entire muon spectrometer ($ |\eta| < 2.4$).CERN-THESIS-2016-056oai:cds.cern.ch:21623982016-06-20T15:56:13Z
spellingShingle Detectors and Experimental Techniques
Gadow, Paul Philipp
Development of a Concept for the Muon Trigger of the ATLAS Detector at the HL-LHC
title Development of a Concept for the Muon Trigger of the ATLAS Detector at the HL-LHC
title_full Development of a Concept for the Muon Trigger of the ATLAS Detector at the HL-LHC
title_fullStr Development of a Concept for the Muon Trigger of the ATLAS Detector at the HL-LHC
title_full_unstemmed Development of a Concept for the Muon Trigger of the ATLAS Detector at the HL-LHC
title_short Development of a Concept for the Muon Trigger of the ATLAS Detector at the HL-LHC
title_sort development of a concept for the muon trigger of the atlas detector at the hl-lhc
topic Detectors and Experimental Techniques
url http://cds.cern.ch/record/2162398
work_keys_str_mv AT gadowpaulphilipp developmentofaconceptforthemuontriggeroftheatlasdetectoratthehllhc