Abstract
The TileCal section of the hadronic calorimeter of the ATLAS detector at the Large Hadron Collider (LHC), CERN, is a sampling calorimeter employing steel plates as absorber and plastic scintillator tiles read out by photomultiplier tubes (PMTs) as the active medium. We present an overview of the calibration system that enables the TileCal to meet its design goals of sub-1% level accuracy as well as excellent short- and long-term stability through constant monitoring.
Highlights
The TileCal section of the hadronic calorimeter of the ATLAS detector at the Large Hadron Collider (LHC), CERN, is a sampling calorimeter employing steel plates as absorber and plastic scintillator tiles read out by photomultiplier tubes (PMTs) as the active medium
ATLAS, one of four detectors to study the outcome of such collisions, has been collecting data smoothly 5 through its many subsystems working in tandem
The TileCal is the central section of the hadronic calorimeter of the ATLAS experiment [1]
Summary
Run 2 of the LHC has been delivering proton-proton, proton-ion, and ionion collisions at the highest-ever energies since 2015. ATLAS, one of four detectors to study the outcome of such collisions, has been collecting data smoothly 5 through its many subsystems working in tandem. The TileCal is the central section of the hadronic calorimeter of the ATLAS experiment [1]. It provides important information for reconstruction of hadrons, jets, hadronic decays of tau leptons and missing transverse energy in collision events. The light produced by the passage of charged particles through the active medium is collected and 10 transmitted by wavelength shifting (WLS) fibres to PMTs located on the outside of the calorimeter. The active volume is segmented longitudinally and transversally into about 5000 cells, each read out by two PMTs. Figure 1 shows. Hydraulic tubes carry movable capsules containing a radioactive source for scintillator calibration
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