ATLAS LAr calorimeter performance and LHC Run-2 commissioning

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• 作者：Fabian Spettel ^{fspettel@mpp.mpg.de" class="auth_mail" title="E-mail the corresponding author} ; On behalf of the ATLAS Collaboration
• 关键词：ATLAS ; Liquid Argon ; Calorimetry
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：11 July 2016
• 年：2016
• 卷：824
• 期：Complete
• 页码：47-49
• 全文大小：1211 K

文摘

The ATLAS detector was built to study proton–proton collisions produced by the Large Hadron Collider (LHC) at a center of mass energy of up to 14 TeV. The Liquid Argon (LAr) calorimeters are used for all electromagnetic calorimetry as well as the hadronic calorimetry in the endcap and forward regions. They have shown excellent performance during the first LHC data taking campaign, from 2010 to 2012, so-called Run 1, at a peak luminosity of source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168900215013406&_mathId=si0003.gif&_user=111111111&_pii=S0168900215013406&_rdoc=1&_issn=01689002&md5=241e4b68ff1f516e7edfe4da337a8ee2">source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0168900215013406-si0003.gif">$8\times {10}^{33}{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$. During the next run, peak luminosities of source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168900215013406&_mathId=si0004.gif&_user=111111111&_pii=S0168900215013406&_rdoc=1&_issn=01689002&md5=412edb1ebff3b91a60f7c467278bc4ff">source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0168900215013406-si0004.gif">$1.5\times {10}^{34}{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$ and even higher are expected at a 25 ns bunch spacing. Such a high collision rate may have an impact on the quality of the energy reconstruction which is attempted to be maintained at a high level using a calibration procedure described in this contribution. It also poses major challenges to the first level of the trigger system which is constrained to a maximal rate of 100 kHz. For Run-3, scheduled to start in 2019, instantaneous luminosity as high as source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168900215013406&_mathId=si0005.gif&_user=111111111&_pii=S0168900215013406&_rdoc=1&_issn=01689002&md5=2100d22adc0d40fad9128ecc11dc67ce">source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0168900215013406-si0005.gif">$3\times {10}^{34}{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$ are foreseen imposing an upgrade of the LAr trigger system to maintain its performance. A demonstrator containing prototypes of the upgraded trigger electronic architecture has been installed on one of the barrel electromagnetic calorimeter readout front end crates to test it during the Run-2 campaign. The new architecture and its benefits for data taking will be discussed below as well as the results from first beam splash events.