Author:
Agaras M.N.,Ahmad A.,Blanco A.,Boumediene D.,Bonnefoy R.,Calvet D.,Calvetti M.,Chadelas R.,Conde Muino P.,Cortes Gonzalez A.,Crouau M.,Crozatier C.,Daudon F.,Davidek T.,Di Gregorio G.,Fiorini L.,Galhardo B.,Gris Ph.,Klimek P.,Lafarguette P.,Lambert D.,Leone S.,Maio A.,Marjanovic M.,Martins F.,Mlynarikova M.,Pereira B.,Pedro R.,Petukhova K.,Polacek S.,Rosten R.,Santoni C.,Scuri F.,Simon D.,Smirnov Y.,Solodkov A.,Solovyanov O.,Van Woerden M.,Veloso F.,Wilkens H.
Abstract
Abstract
This article reports the laser calibration of the hadronic
Tile Calorimeter of the ATLAS experiment in the LHC Run 2 data
campaign. The upgraded Laser II calibration system is described. The
system was commissioned during the first LHC Long Shutdown,
exhibiting a stability better than 0.8% for the laser light
monitoring. The methods employed to derive the detector calibration
factors with data from the laser calibration runs are also
detailed. These allowed to correct for the response fluctuations of
the 9852 photomultiplier tubes of the Tile Calorimeter with a total
uncertainty of 0.5% plus a luminosity-dependent sub-dominant
term. Finally, we report the regular monitoring and performance
studies using laser events in both standalone runs and during proton
collisions. These studies include channel timing and quality
inspection, and photomultiplier linearity and response dependence on
anode current.
Subject
Mathematical Physics,Instrumentation