Browsing by Author "Seabra, L.F.Oleiro"
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- The Laser calibration of the Atlas Tile Calorimeter during the LHC run 1Publication . ATLAS Tile Calorimeter system collaboration (238 authors); Santos, S.P.Amor Dos; Araque, J.P.; Castro, A.Blanco; Carvalho, J.; Castro, N.F.; De Sousa, M.J.Da Cunha Sargedas; Fiolhais, M.C.N.; Galhardo, B.; Gomes, A.; Jorge, P.M.; Martins, P.J.Magalhaes; Maio, A.; Maneira, J.; Seabra, L.F.Oleiro; Onofre, A.; Pedro, R.; Pina, J.; Santos, H.; Saraiva, J.G.; Silva, J.; Delgado, A.Tavares; Veloso, F.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.