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

Collaboration
May 26, 2023
233 pages
Published in:
  • JINST 19 (2024) 05, P05063
  • Published: May 23, 2024
e-Print:
DOI:
Report number:
  • CERN-EP-2022-259
Experiments:
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Abstract: (IOP)
The ATLAS detector is installed in its experimental cavernat Point 1 of the CERN Large Hadron Collider. During Run 2 of theLHC, a luminosity of ℒ = 2 × 1034^{34} cm−2^{-2} s−1^{-1} wasroutinely achieved at the start of fills, twice the designluminosity. For Run 3, accelerator improvements, notably luminositylevelling, allow sustained running at an instantaneous luminosity of ℒ = 2 × 1034^{34} cm−2^{-2} s−1^{-1},with an average of up to 60 interactions per bunch crossing. TheATLAS detector has been upgraded to recover Run 1 single-leptontrigger thresholds while operating comfortably under Run 3 sustainedpileup conditions. A fourth pixel layer 3.3 cm from the beam axiswas added before Run 2 to improve vertex reconstruction andb-tagging performance. New Liquid Argon Calorimeter digitaltrigger electronics, with corresponding upgrades to the Trigger andData Acquisition system, take advantage of a factor of 10 finergranularity to improve triggering on electrons, photons, taus, andhadronic signatures through increased pileup rejection. The innermuon endcap wheels were replaced by New Small Wheels with Micromegasand small-strip Thin Gap Chamber detectors, providing both precisiontracking and Level-1 Muon trigger functionality. Trigger coverage ofthe inner barrel muon layer near one endcap region was augmentedwith modules integrating new thin-gap resistive plate chambers andsmaller-diameter drift-tube chambers. Tile Calorimeter scintillationcounters were added to improve electron energy resolution andbackground rejection. Upgrades to Minimum Bias Trigger Scintillatorsand Forward Detectors improve luminosity monitoring and enable totalproton-proton cross section, diffractive physics, and heavy ionmeasurements. These upgrades are all compatible with operation inthe much harsher environment anticipated after the High-Luminosityupgrade of the LHC and are the first steps towards preparing ATLASfor the High-Luminosity upgrade of the LHC. This paper describesthe Run 3 configuration of the ATLAS detector.
Note:
  • Calorimeter methods
  • Large detector systems for particle and astroparticle physics
  • Muon spectrometers
  • Particle tracking detectors
  • activity report
  • upgrade
  • scintillation counter
  • trigger
  • energy resolution
  • calorimeter: liquid argon