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Laser calibration of the ATLAS Tile Calorimeter during LHC Run 2

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arxiv 2303.00121 v2 pith:BDECWIJS submitted 2023-02-28 physics.ins-det hep-ex

classification physics.ins-dethep-ex
keywords lasercalibrationcalorimeterduringtileatlasdatamonitoring
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Study of the Radiation Hardness of the ATLAS Tile Calorimeter Optical Instrumentation with Run 2 data

    physics.ins-det 2024-12 conditional novelty 4.0 of 10

    Run 2 calibration data show the TileCal optics lost up to 11 percent light in the hottest cells, with a dose-rate-dependent model predicting about half the light lost in the inner layer by the end of HL-LHC.

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