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@ARTICLE{Aad:589144,
      author       = {Aad, Georges and others},
      collaboration = {{ATLAS Collaboration}},
      title        = {{T}he {ATLAS} {E}xperiment at the {CERN} {L}arge {H}adron
                      {C}ollider: {A} {D}escription of the {D}etector
                      {C}onfiguration for {R}un 3},
      reportid     = {PUBDB-2023-05079, arXiv:2305.16623. CERN-EP-2022-259},
      year         = {2023},
      note         = {233 pages in total, author list starting page 214, 116
                      figures, 15 tables, submitted to JINST. All figures
                      including auxiliary figures are available at
                      http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/GENR-2019-02/},
      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.},
      keywords     = {activity report (INSPIRE) / upgrade (INSPIRE) /
                      scintillation counter (INSPIRE) / trigger (INSPIRE) / energy
                      resolution (INSPIRE) / calorimeter: liquid argon (INSPIRE) /
                      electronics: readout (INSPIRE) / vertex detector (INSPIRE) /
                      ATLAS (INSPIRE) / pile-up (INSPIRE) / data acquisition
                      (INSPIRE) / Micromegas (INSPIRE) / background (INSPIRE) /
                      performance (INSPIRE) / semiconductor detector: pixel
                      (INSPIRE) / detector: design (INSPIRE)},
      cin          = {ATLAS / FHTestBeam},
      cid          = {I:(DE-H253)ATLAS-20120731 / I:(DE-H253)FHTestBeam-20150203},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611)},
      pid          = {G:(DE-HGF)POF4-611},
      experiment   = {EXP:(DE-H253)LHC-Exp-ATLAS-20150101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2305.16623},
      howpublished = {arXiv:2305.16623},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2305.16623;\%\%$},
      doi          = {10.3204/PUBDB-2023-05079},
      url          = {https://bib-pubdb1.desy.de/record/589144},
}