The ATLAS Experiment at the CERN Large Hadron Collider: A Description of the Detector Configuration for Run 3

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 $\mathcal{L}=2\times 10^{34}{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$ 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 $\mathcal{L}=2\times 10^{34}{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$, 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. 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.

233 pages in total, author list starting page 214, 116 figures, 15 tables, published in JINST. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/GENR-2019-02/

References in corpus (15)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• An Introduction to PYTHIA 8.2
• Study of the material of the ATLAS inner detector for Run 2 of the LHC
• Luminosity determination in pp collisions at $\sqrt{s}$ = 8 TeV using the ATLAS detector at the LHC
• Operation and performance of the ATLAS semiconductor tracker
• Further evaluation of a THGEM UV-photon detector for RICH - comparison with MWPC
• Monitoring and data quality assessment of the ATLAS liquid argon calorimeter
• The ALFA Roman Pot Detectors of ATLAS
• Modelling radiation damage to pixel sensors in the ATLAS detector
• Beam tests of an integrated prototype of the ATLAS Forward Proton detector
• Measurements of sensor radiation damage in the ATLAS inner detector using leakage currents
• New High-Precision Drift-Tube Detectors for the ATLAS Muon Spectrometer
• The BRAN luminosity detectors for the LHC
• The New Small Wheel electronics

Cited by in corpus (19)

• Software and computing for Run 3 of the ATLAS experiment at the LHC
• The ATLAS Trigger System for LHC Run 3 and Trigger performance in 2022
• Search for magnetic monopole pair production in ultraperipheral Pb+Pb collisions at $\sqrt{s_{{}_{\text{NN}}}}=5.36$ TeV with the ATLAS detector at the LHC
• Electroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHC
• Search for emerging jets in $pp$ collisions at $\sqrt{s}=13.6$ TeV with the ATLAS experiment
• Summary of the trigger systems of the Large Hadron Collider experiments ALICE, ATLAS, CMS and LHCb
• Evidence for the dimuon decay of the Higgs boson in pp collisions with the ATLAS detector
• Transforming jet flavour tagging at ATLAS
• Beam-induced backgrounds measured in the ATLAS detector during local gas injection into the LHC beam vacuum
• Configuration, Performance, and Commissioning of the ATLAS $b$-jet Triggers for the 2022 and 2023 LHC data-taking periods
• Extended thermal cycling of ATLAS ITk strip modules with and without stress mitigating interposers
• Search for displaced leptons in $\sqrt{s}=13$ TeV and $13.6$ TeV $pp$ collisions with the ATLAS detector
• Combination of measurements of CP properties of Higgs boson interactions with vector bosons using proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Study of the Radiation Hardness of the ATLAS Tile Calorimeter Optical Instrumentation with Run 2 data
• Threshold bounce -- occupancy-dependent modulation of the discriminating threshold in silicon detectors
• Search for squarks and gluinos in $pp$ collisions at $\sqrt{s}=13$ TeV and $13.6$ TeV in events with $\tau$-leptons, jets and missing transverse momentum using the ATLAS detector
• Octet scalars shaping LHC distributions in 4-jet final states
• Ultra Fast Calorimeter Simulation with Generative Machine Learning on FPGAs
• Photon production in top quark events at ATLAS and CMS