Abstract
The Tile Calorimeter (TileCal) of the ATLAS experiment at the LHC is the central hadronic calorimeter designed for the reconstruction of hadrons, jets, tau-particles and missing transverse energy. This sampling calorimeter uses steel plates as absorber and scintillating tiles as active medium. The light produced by the passage of charged particles is transmitted by wavelength shifting fibers to photomultiplier tubes (PMTs). The readout is segmented into about 5000 cells, each of them being read out by two PMTs in parallel. The TileCal calibration system comprises Cesium radioactive sources, laser, charge injection elements, and an integrator based readout system. Combined information from all systems allows to monitor and to equalize the calorimeter response at each stage of the signal evolution, from scintillation light to digitization. The performance of the calorimeter has been established with cosmic ray muons and the large sample of the proton-proton collisions. The response of high momentum isolated muons is used to study the energy response at the electromagnetic scale, isolated hadrons are used as a probe of the hadronic response. The calorimeter time resolution is studied with multi-jet events. A description of the different TileCal calibration systems and the results on the calorimeter performance during the LHC Run 2 will be presented.
Highlights
A12 A13 A14TileCal – a central (|η| < 1.7) section of the hadronic calorimeter at the ATLAS experiment Measurement of energy deposited by hadrons reconstruction of jet 4-vectors, hadronically decaying τ -leptons, and missing transverse energy (MET)
PMT gains, fibers – CCs Laser system tests PMT response and provides additional checks of high voltage (HV) and time stability – Claser Charge Injection System (CIS) calibrates response of electronics to known charge in 2 read-out channels – CADC→pC Integrator (Minimum Bias) system monitors optical path and PMT gain provides measurement of instantaneous luminosity measuring signal from soft (MB) interactions
PMT drift, scintillator ageing CCs is used to equalize the response for all channels and setup EM scale
Summary
TileCal – a central (|η| < 1.7) section of the hadronic calorimeter at the ATLAS experiment Measurement of energy deposited by hadrons reconstruction of jet 4-vectors, hadronically decaying τ -leptons, and missing transverse energy (MET). PMT gains, fibers – CCs Laser system tests PMT response and provides additional checks of high voltage (HV) and time stability – Claser Charge Injection System (CIS) calibrates response of electronics to known charge in 2 read-out channels – CADC→pC Integrator (Minimum Bias) system monitors optical path and PMT gain provides measurement of instantaneous luminosity measuring signal from soft (MB) interactions. Moveable 137Cs radioactive γ-source (662 MeV) illuminates tiles System calibrates optic components and monitors the detector response (identify PMT drift, scintillator ageing) CCs system is used to equalize the detector response to the level of EM scale (CpC→GeV ) measured during test beams (by changing high voltage). Zero-bias data runs considered It depends on exposure to beam: the highest for E- and A-cells
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