Abstract
The Tile Calorimeter is the central section of the ATLAS hadronic calorimeter at the Large Hadron Collider. This detector is instrumented for the measurements of hadrons, jets, tau leptons and missing transverse energy. Scintillation light produced in the tiles is transmitted by wavelength shifting fibers to photomultiplier tubes (PMTs). The resulting electronic signals from approximately 10000 PMTs are measured and digitized before being transferred to off- detector data-acquisition systems. After an initial setting of the absolute energy scale in test beams with particles of well-defined momentum, the calibrated scale is transferred to the rest of the detector via the response to radioactive sources. The calibrated scale is validated in situ with muons and single hadrons whereas the timing performance is checked with muons and jets. The data quality procedures used during the LHC data-taking and the evolution of the detector status during the LHC Run 1 are presented. The energy and the time reconstruction performance of the digitized signals is summarized and the calorimeter response to hadrons is investigated with collision data.
Highlights
The ATLAS Tile Calorimeter (TileCal) is the barrel hadronic calorimeter of the ATLAS experiment at the Large Hadron Collider
The TileCal is a sampling calorimeter using plastic scintillator as active material and lowcarbon steel as the absorber. It is divided into a long barrel (LB) in the central region (-1.0 < η < 1.0) and two extended barrels (EB) spanning 0.8 < |η| < 1.7
At the end of the LHC Run 1, in February 2013, about 3% of TileCal cells were masked
Summary
The ATLAS Tile Calorimeter (TileCal) is the barrel hadronic calorimeter of the ATLAS experiment at the Large Hadron Collider (see figure 1). The fraction of masked cells changed over time, increasing during the periods when the LHC was operational and decreasing to almost 0% during the maintenance period when the front-end electronics could be accessed and repaired. At the end of the LHC Run 1, in February 2013, about 3% of TileCal cells were masked The majority of these were due to six modules being powered off because of failures in the LVPS. During the current LHC shutdown of 2013-2014, TileCal is undergoing major maintenance interventions to repair and consolidate all 256 modules and replace all LVPS with the upgraded ones. These activities aim to ensure high performance, high quality and robust operations during Run 2
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