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Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 2864
2016 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 11, P05013Article in journal (Refereed) Published
Abstract [en]

This paper discusses various observations on beam-induced and cosmic-ray backgrounds in the ATLAS detector during the LHC 2012 proton-proton run. Building on published results based on 2011 data, the correlations between background and residual pressure of the beam vacuum are revisited. Ghost charge evolution over 2012 and its role for backgrounds are evaluated. New methods to monitor ghost charge with beam-gas rates are presented and observations of LHC abort gap population by ghost charge are discussed in detail. Fake jets from colliding bunches and from ghost charge are analysed with improved methods, showing that ghost charge in individual radio-frequency buckets of the LHC can be resolved. Some results of two short periods of dedicated cosmic-ray background data-taking are shown; in particular cosmic-ray muon induced fake jet rates are compared to Monte Carlo simulations and to the fake jet rates from beam background. A thorough analysis of a particular LHC fill, where abnormally high background was observed, is presented. Correlations between backgrounds and beam intensity losses in special fills with very high beta* are studied.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2016. Vol. 11, P05013
Keyword [en]
Beam-line instrumentation (beam position and profile monitors, beam-intensity monitors, bunch length monitors), Data analysis, Performance of High Energy Physics Detectors
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-189851DOI: 10.1088/1748-0221/11/05/P05013ISI: 000377851700036OAI: oai:DiVA.org:kth-189851DiVA: diva2:949268
Note

QC 20160718

Available from: 2016-07-18 Created: 2016-07-18 Last updated: 2016-07-18Bibliographically approved

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Lund-Jensen, BengtSidebo, EdvinStrandberg, Jonas
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