Comparison between simulated and observed LHC beam backgrounds in the ATLAS experiment at Ebeam=4 TeV

ATLAS Collaboration, Paul Newman (Contributor)

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2 Citations (Scopus)
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Abstract

Results of dedicated Monte Carlo simulations of beam-induced background (BIB) in the ATLAS experiment at the Large Hadron Collider (LHC) are presented and compared with data recorded in 2012. During normal physics operation this background arises mainly from scattering of the 4 TeV protons on residual gas in the beam pipe. Methods of reconstructing the BIB signals in the ATLAS detector, developed and implemented in the simulation chain based on the \textsc{Fluka} Monte Carlo simulation package, are described. The interaction rates are determined from the residual gas pressure distribution in the LHC ring in order to set an absolute scale on the predicted rates of BIB so that they can be compared quantitatively with data. Through these comparisons the origins of the BIB leading to different observables in the ATLAS detectors are analysed. The level of agreement between simulation results and BIB measurements by ATLAS in 2012 demonstrates that a good understanding of the origin of BIB has been reached.
Original languageEnglish
Article numberP12006
JournalJournal of Instrumentation
Volume13
DOIs
Publication statusPublished - 4 Dec 2018

Bibliographical note

44 pages in total, author list starting on page 28, 14 figures, 4 tables, submitted to JINST, figures available on https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/DAPR-2017-01

Keywords

  • hep-ex

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