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Abstract
This article describes the Laser calibration system of the ATLAS hadronic Tile Calorimeter that has been used during the run 1 of the LHC . First, the stability of the system associated readout electronics is studied. It is found to be stable with variations smaller than 0.6 %. Then, the method developed to compute the calibration constants, to correct for the variations of the gain of the calorimeter photomultipliers, is described. These constants were determined with a statistical uncertainty of 0.3 % and a systematic uncertainty of 0.2 % for the central part of the calorimeter and 0.5 % for the end-caps. Finally, the detection and correction of timing mis-configuration of the Tile Calorimeter using the Laser system are also presented.
Highlights
The part of TileCal that is in the ATLAS barrel is called the long barrel (LB), while the parts that are in the endcaps are called the extended barrels (EB)
The Laser system is one of the three calibration systems of the ATLAS Tile Calorimeter. It is a key component for monitoring and calibrating the 9852 TileCal photomultipliers and their associated readout electronics
The Laser calibration constant fLas applied on each channel has been regularly measured, with a statistical uncertainty at the level of 0.3 %, and is one ingredient in the TileCal cell energy reconstruction
Summary
The ATLAS detector is made of a central part, called the barrel, and two endcaps. The TileCal is the only hadronic calorimeter of ATLAS. TileCal constitutes the external part of the hadronic calorimeter, the internal part using the liquid argon technology. The part of TileCal that is in the ATLAS barrel is called the long barrel (LB), while the parts that are in the endcaps are called the extended barrels (EB). The Tile Calorimeter is the result of a long process of R&D and construction. The Technical Design Report [3] has been completed in 1995 and the construction of the mechanical part ended in 2006. After a period of operation using cosmic muons, the TileCal was ready in 2009 to record the first LHC proton-proton collisions
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