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The Tile Calorimeter (TileCal) is a hadron calorimeter covering the central region of the ATLAS experiment. It provides important information for the reconstruction of hadrons, jets, hadronic decays of tau leptons, missing transverse energy, and assists in muon identification. The light produced by the passage of charged particles through the scintillating tiles acting as the active material sandwiched between slabs of steel absorber is collected by 9852 photomultipliers. Each stage of the signal production from scintillation light to the signal reconstruction is monitored and calibrated. The data collected during the LHC Run-2 were used for detailed analyses of the TileCal performance. The effects of prolonged exposure to intense radiation on the TileCal response have been studied. The understanding of the aging of the detector components is crucial concerning the Run-3 and HL-LHC. High-momentum isolated muons have been used to study and validate the electromagnetic scale, while the hadronic response has been probed with isolated hadrons. The calorimeter time resolution has been studied with multi-jet events. A summary of the performance results including the calibration, stability, absolute energy scale, uniformity, time resolution, and aging of the scintillating tiles and wave-length-shifting fibers will be presented. The first results using the LHC Run-3 data will also be shown.
Stanislav Polacek (Wed,) studied this question.