Abstract
The Tile Calorimeter (TileCal) is the hadronic calorimeter covering the central region of the ATLAS experiment at the LHC. This sampling device is made of plastic scintillating tiles alternated with iron plates and its response is calibrated to electromagnetic scale by means of several dedicated calibration systems.The accurate time calibration is important for the energy reconstruction, non-collision background removal as well as for specific physics analyses. The initial time calibration with so-called splash events and subsequent fine-tuning with collision data are presented. The monitoring of the time calibration with laser system and physics collision data is discussed as well as the corrections for sudden changes performed still before the recorded data are processed for physics analyses. Finally, the time resolution as measured with jets and isolated muons is presented.
Highlights
The Tile Calorimeter is part of the ATLAS experiment [1], which explores the proton-proton collisions at unprecedented high energies achieved at the LHC
Tile Calorimeter (TileCal) surrounds the liquid-argon electromagnetic and hadronic end-cap calorimeters and it spans over the ATLAS central region (|η| < 1.7)
The readout cells are organized into 3 radial layers of the total depth of 7.4 λint
Summary
The Tile Calorimeter is part of the ATLAS experiment [1], which explores the proton-proton (and lead-lead) collisions at unprecedented high energies achieved at the LHC. The aim of the time calibration is to set the phase in each channel so that a particle travelling from the ATLAS interaction point at the speed of light produces the signal with measured time equal to zero. Large signals are observed during splash events in all calorimeter cells, allowing a precise time measurement of the pulses.
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