ATLAS Tile calorimeter calibration and PMT response
| Autor: | D. Boumediene |
|---|---|
| Přispěvatelé: | Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), ATLAS, Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Photomultiplier
Physics::Instrumentation and Detectors measurement methods Scintillator 7. Clean energy 01 natural sciences 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Optics calorimeter: hadronic 0103 physical sciences Calibration [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] Instrumentation Mathematical Physics scintillation counter Physics Scintillation Large Hadron Collider photomultiplier Calorimeter (particle physics) 010308 nuclear & particles physics business.industry calorimeter: design ATLAS experiment Astrophysics::Instrumentation and Methods for Astrophysics ATLAS stability efficiency: quantum monitoring Scintillation counter High Energy Physics::Experiment calorimeter: calibration business Particle Physics - Experiment performance |
| Zdroj: | JINST 3rd Conference on Calorimetry for the High Energy Frontier 3rd Conference on Calorimetry for the High Energy Frontier, Nov 2019, Fukuoka, Japan. pp.C04051, ⟨10.1088/1748-0221/15/04/C04051⟩ |
| DOI: | 10.1088/1748-0221/15/04/C04051⟩ |
| Popis: | International audience; The ATLAS Tile Calorimeter (TileCal) is the central section of the hadronic calorimeter of the ATLAS experiment at the Large Hadron Collider. It provides important information for reconstruction of hadrons, jets, hadronic decays of tau leptons and missing transverse energy. This sampling calorimeter uses steel plates as absorber and scintillating tiles as active medium. Scintillating light is transmitted by wavelength shifting fibres to photomultiplier tubes (PMTs) in the rear girders of the wedge-shaped calorimeter modules. Photomultiplier signals are then digitized at 40 MHz and stored on-detector in digital pipelines. Event data are transmitted off-detector upon a first level trigger acceptance, at a maximum rate of 100 kHz. The readout is segmented into about 5000 cells, each read out by two PMTs on opposite sides of the cells. To calibrate and monitor the stability and performance of each part of the readout chain during the data taking, a set of calibration systems is used. The TileCal calibration system comprises Cesium radioactive sources, a laser, a charge injection system and an integrator based readout system. Combined information from all systems allows the calorimeter response to be monitored and equalised at each stage of the signal production, from scintillation light to digitisation. After exposure to scintillator light for almost 10 years, variations in gain have been observed when the PMTs are exposed to large light currents. These variations have been studied and correlated to some intrinsic properties of the PMTs, including the quantum efficiency, as well as operation conditions like the High Voltage. Latest results and conclusions are presented. |
| Databáze: | OpenAIRE |
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