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The ATLAS liquid argon calorimeter high-voltage system: commissioning, optimisation, and LHC relative luminosity measurement

Abstract : The main goals of the ATLAS scientific programme are the observation or exclusion of physics beyond the Standard Model (SM), as well as the measurement of production cross-sections of SM processes. In order to do so, it is important to measure the lumi- nosity at the interaction point with great precision. The ATLAS luminosity is extracted using several detectors with varying efficiencies and acceptances. Different methods, such as inclusive - or coincidence - event counting and calorimeter integrated current measurements, are calibrated and cross-compared to provide the most accurate lumi- nosity determination. In order to provide more cross-checks and a better control on the systematic uncertainties, an independent measurement using the liquid argon (LAr) for- ward calorimeter (FCal), based on the readout current of its high-voltage system, has been developed. This document describes how the LAr calorimeter high-voltage system has been installed and commissioned, as well as its application to a relative luminosity determination.
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https://tel.archives-ouvertes.fr/tel-00658194
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Submitted on : Tuesday, January 10, 2012 - 11:08:30 AM
Last modification on : Thursday, January 18, 2018 - 2:21:26 AM
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Samir. Arfaoui. The ATLAS liquid argon calorimeter high-voltage system: commissioning, optimisation, and LHC relative luminosity measurement. Instrumentation and Detectors [physics.ins-det]. Université de la Méditerranée - Aix-Marseille II, 2011. English. ⟨tel-00658194⟩

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