Readiness of the ATLAS liquid argon calorimeter for LHC collisions

The ATLAS collaboration

    Research output: Contribution to journalArticle

    Abstract

    The ATLAS liquid argon calorimeter has been operating continuously since August 2006. At this time, only part of the calorimeter was readout, but since the beginning of 2008, all calorimeter cells have been connected to the ATLAS readout system in preparation for LHC collisions. This paper gives an overview of the liquid argon calorimeter performance measured in situ with random triggers, calibration data, cosmic muons, and LHC beam splash events. Results on the detector operation, timing performance, electronics noise, and gain stability are presented. High energy deposits from radiative cosmic muons and beam splash events allow to check the intrinsic constant term of the energy resolution. The uniformity of the electromagnetic barrel calorimeter response along η (averaged over Φ) is measured at the percent level using minimum ionizing cosmic muons. Finally, studies of electromagnetic showers from radiative muons have been used to cross-check the Monte Carlo simulation. The performance results obtained using the ATLAS readout, data acquisition, and reconstruction software indicate that the liquid argon calorimeter is well-prepared for collisions at the dawn of the LHC era.

    Original languageEnglish (US)
    Pages (from-to)723-753
    Number of pages31
    JournalEuropean Physical Journal C
    Volume70
    Issue number3
    DOIs
    StatePublished - Dec 2010

    Fingerprint

    Calorimeters
    calorimeters
    Argon
    argon
    collisions
    muons
    Liquids
    liquids
    readout
    electromagnetism
    Readout systems
    showers
    data acquisition
    Data acquisition
    Electronic equipment
    Deposits
    actuators
    deposits
    time measurement
    Calibration

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)
    • Engineering (miscellaneous)

    Cite this

    Readiness of the ATLAS liquid argon calorimeter for LHC collisions. / The ATLAS collaboration.

    In: European Physical Journal C, Vol. 70, No. 3, 12.2010, p. 723-753.

    Research output: Contribution to journalArticle

    The ATLAS collaboration. / Readiness of the ATLAS liquid argon calorimeter for LHC collisions. In: European Physical Journal C. 2010 ; Vol. 70, No. 3. pp. 723-753.
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    abstract = "The ATLAS liquid argon calorimeter has been operating continuously since August 2006. At this time, only part of the calorimeter was readout, but since the beginning of 2008, all calorimeter cells have been connected to the ATLAS readout system in preparation for LHC collisions. This paper gives an overview of the liquid argon calorimeter performance measured in situ with random triggers, calibration data, cosmic muons, and LHC beam splash events. Results on the detector operation, timing performance, electronics noise, and gain stability are presented. High energy deposits from radiative cosmic muons and beam splash events allow to check the intrinsic constant term of the energy resolution. The uniformity of the electromagnetic barrel calorimeter response along η (averaged over Φ) is measured at the percent level using minimum ionizing cosmic muons. Finally, studies of electromagnetic showers from radiative muons have been used to cross-check the Monte Carlo simulation. The performance results obtained using the ATLAS readout, data acquisition, and reconstruction software indicate that the liquid argon calorimeter is well-prepared for collisions at the dawn of the LHC era.",
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