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The ATLAS experiment at the CERN Large Hadron Collider: a description of the detector configuration for Run 3

Aad, G ; Åkesson, T.P.A. LU orcid ; Corrigan, E.E. LU ; Doglioni, C. LU ; Ekman, P.A. LU ; Geisen, J. LU orcid ; Hedberg, V. LU ; Herde, H. LU orcid ; Jarlskog, G. LU and Konya, B. LU , et al. (2024) In Journal of Instrumentation 19(5).
Abstract
The ATLAS detector is installed in its experimental cavern at Point 1 of the CERN Large Hadron Collider. During Run 2 of the LHC, a luminosity of ℒ = 2 × 1034 cm-2 s-1 was routinely achieved at the start of fills, twice the design luminosity. For Run 3, accelerator improvements, notably luminosity levelling, allow sustained running at an instantaneous luminosity of ℒ = 2 × 1034 cm-2 s-1, with an average of up to 60 interactions per bunch crossing. The ATLAS detector has been upgraded to recover Run 1 single-lepton trigger thresholds while operating comfortably under Run 3 sustained pileup conditions. A fourth pixel layer 3.3 cm from the beam axis was added before Run 2 to improve vertex reconstruction and b-tagging performance. New Liquid... (More)
The ATLAS detector is installed in its experimental cavern at Point 1 of the CERN Large Hadron Collider. During Run 2 of the LHC, a luminosity of ℒ = 2 × 1034 cm-2 s-1 was routinely achieved at the start of fills, twice the design luminosity. For Run 3, accelerator improvements, notably luminosity levelling, allow sustained running at an instantaneous luminosity of ℒ = 2 × 1034 cm-2 s-1, with an average of up to 60 interactions per bunch crossing. The ATLAS detector has been upgraded to recover Run 1 single-lepton trigger thresholds while operating comfortably under Run 3 sustained pileup conditions. A fourth pixel layer 3.3 cm from the beam axis was added before Run 2 to improve vertex reconstruction and b-tagging performance. New Liquid Argon Calorimeter digital trigger electronics, with corresponding upgrades to the Trigger and Data Acquisition system, take advantage of a factor of 10 finer granularity to improve triggering on electrons, photons, taus, and hadronic signatures through increased pileup rejection. The inner muon endcap wheels were replaced by New Small Wheels with Micromegas and small-strip Thin Gap Chamber detectors, providing both precision tracking and Level-1 Muon trigger functionality. Trigger coverage of the inner barrel muon layer near one endcap region was augmented with modules integrating new thin-gap resistive plate chambers and smaller-diameter drift-tube chambers. Tile Calorimeter scintillation counters were added to improve electron energy resolution and background rejection. Upgrades to Minimum Bias Trigger Scintillators and Forward Detectors improve luminosity monitoring and enable total proton-proton cross section, diffractive physics, and heavy ion measurements. These upgrades are all compatible with operation in the much harsher environment anticipated after the High-Luminosity upgrade of the LHC and are the first steps towards preparing ATLAS for the High-Luminosity upgrade of the LHC. This paper describes the Run 3 configuration of the ATLAS detector. © 2024 CERN for the benefit of the ATLAS collaboration. (Less)
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Contribution to journal
publication status
published
subject
keywords
Calorimeter methods, Large detector systems for particle and astroparticle physics, Muon spectrometers, Particle tracking detectors, Colliding beam accelerators, Data acquisition, Electron energy levels, Energy dissipation, Hadrons, Heavy ions, Liquefied gases, Luminance, Particle detectors, Wheels, Astroparticle physics, ATLAS detectors, Calorimeter method, Detector systems, Large detector system for particle and astroparticle physic, Large detectors, Muon spectrometer, Particle tracking, Particle tracking detector, Tracking detectors, Calorimeters
in
Journal of Instrumentation
volume
19
issue
5
article number
P05063
publisher
IOP Publishing
external identifiers
  • scopus:85196183700
ISSN
1748-0221
DOI
10.1088/1748-0221/19/05/P05063
language
English
LU publication?
yes
id
431a8d85-9870-433b-9a68-1eb8290164af
date added to LUP
2024-08-29 13:01:27
date last changed
2024-08-29 13:02:38
@article{431a8d85-9870-433b-9a68-1eb8290164af,
  abstract     = {{The ATLAS detector is installed in its experimental cavern at Point 1 of the CERN Large Hadron Collider. During Run 2 of the LHC, a luminosity of ℒ = 2 × 1034 cm-2 s-1 was routinely achieved at the start of fills, twice the design luminosity. For Run 3, accelerator improvements, notably luminosity levelling, allow sustained running at an instantaneous luminosity of ℒ = 2 × 1034 cm-2 s-1, with an average of up to 60 interactions per bunch crossing. The ATLAS detector has been upgraded to recover Run 1 single-lepton trigger thresholds while operating comfortably under Run 3 sustained pileup conditions. A fourth pixel layer 3.3 cm from the beam axis was added before Run 2 to improve vertex reconstruction and b-tagging performance. New Liquid Argon Calorimeter digital trigger electronics, with corresponding upgrades to the Trigger and Data Acquisition system, take advantage of a factor of 10 finer granularity to improve triggering on electrons, photons, taus, and hadronic signatures through increased pileup rejection. The inner muon endcap wheels were replaced by New Small Wheels with Micromegas and small-strip Thin Gap Chamber detectors, providing both precision tracking and Level-1 Muon trigger functionality. Trigger coverage of the inner barrel muon layer near one endcap region was augmented with modules integrating new thin-gap resistive plate chambers and smaller-diameter drift-tube chambers. Tile Calorimeter scintillation counters were added to improve electron energy resolution and background rejection. Upgrades to Minimum Bias Trigger Scintillators and Forward Detectors improve luminosity monitoring and enable total proton-proton cross section, diffractive physics, and heavy ion measurements. These upgrades are all compatible with operation in the much harsher environment anticipated after the High-Luminosity upgrade of the LHC and are the first steps towards preparing ATLAS for the High-Luminosity upgrade of the LHC. This paper describes the Run 3 configuration of the ATLAS detector. © 2024 CERN for the benefit of the ATLAS collaboration.}},
  author       = {{Aad, G and Åkesson, T.P.A. and Corrigan, E.E. and Doglioni, C. and Ekman, P.A. and Geisen, J. and Hedberg, V. and Herde, H. and Jarlskog, G. and Konya, B. and Lytken, E. and Mjörnmark, J.U. and Poettgen, R. and Simpson, N.D. and Skorda, E. and Smirnova, O. and Zwalinski, L.}},
  issn         = {{1748-0221}},
  keywords     = {{Calorimeter methods; Large detector systems for particle and astroparticle physics; Muon spectrometers; Particle tracking detectors; Colliding beam accelerators; Data acquisition; Electron energy levels; Energy dissipation; Hadrons; Heavy ions; Liquefied gases; Luminance; Particle detectors; Wheels; Astroparticle physics; ATLAS detectors; Calorimeter method; Detector systems; Large detector system for particle and astroparticle physic; Large detectors; Muon spectrometer; Particle tracking; Particle tracking detector; Tracking detectors; Calorimeters}},
  language     = {{eng}},
  number       = {{5}},
  publisher    = {{IOP Publishing}},
  series       = {{Journal of Instrumentation}},
  title        = {{The ATLAS experiment at the CERN Large Hadron Collider: a description of the detector configuration for Run 3}},
  url          = {{http://dx.doi.org/10.1088/1748-0221/19/05/P05063}},
  doi          = {{10.1088/1748-0221/19/05/P05063}},
  volume       = {{19}},
  year         = {{2024}},
}