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Fast shower simulation in the ATLAS calorimeter

Barberio, E. and Boudreau, J. and Butler, B. and Cheung, S. L. and Dell'Acqua, A. and Di Simone, A. and Ehrenfeld, W. and Gallas, M. V. and Glazov, A. and Marshall, Z. and Mueller, J. and Placakyte, R. and Rimoldi, A. and Savard, P. and Tsulaia, V. and Waugh, A. and Young, C. C. (2008) Fast shower simulation in the ATLAS calorimeter. Journal of Physics: Conference Series, 119 . 032008. ISSN 1742-6596. doi:10.1088/1742-6596/119/3/032008.

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The time to simulate pp collisions in the ATLAS detector is largely dominated by the showering of electromagnetic particles in the heavy parts of the detector, especially the electromagnetic barrel and endcap calorimeters. Two procedures have been developed to accelerate the processing time of electromagnetic particles in these regions: (1) a fast shower parameterisation and (2) a frozen shower library. Both work by generating the response of the calorimeter to electrons and positrons with Geant 4, and then reintroduce the response into the simulation at runtime. In the fast shower parameterisation technique, a parameterisation is tuned to single electrons and used later by simulation. In the frozen shower technique, actual showers from low-energy particles are used in the simulation. Full Geant 4 simulation is used to develop showers down to ~1 GeV, at which point the shower is terminated by substituting a frozen shower. Judicious use of both techniques over the entire electromagnetic portion of the ATLAS calorimeter produces an important improvement of CPU time. We discuss the algorithms and their performance in this paper.

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Mueller, J.0000-0002-4808-2223
Additional Information:Accepted papers received: 23 June 2008. Published online: 31 July 2008. © 2008 IOP Publishing Ltd. International Conference on Computing in High Energy and Nuclear Physics (CHEP '07) Victoria, BC, Canada, 2-7 September 2007.
Subject Keywords:high energy physics instrumentation computing; particle calorimetry; position sensitive particle detectors; proton-proton inclusive interactions.
Record Number:CaltechAUTHORS:BARjpcs08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13539
Deposited By: Ruth Sustaita
Deposited On:17 Jun 2009 18:47
Last Modified:12 Jul 2022 19:49

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