Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period

ATLAS Collaboration; M Ishino; T Kunigo; R Monden; T Sumida; R Takashima; T Tashiro

doi:10.1088/1748-0221/11/05/P05013

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Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period

ATLAS Collaboration, M Ishino, T Kunigo, R Monden, T Sumida, R Takashima and T Tashiro

Journal of instrumentation, Vol.11(5), P05013

05/20/2016

DOI: 10.1088/1748-0221/11/05/P05013

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Abstract

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 β* are studied.

Data Analysis

Beam-line instrumentation (beam position and profile monitors; beam-intensity mon-itors; bunch length monitors)

Performance of High Energy Physics Detectors

Details

Title: Subtitle: Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period
Creators: ATLAS Collaboration
M Ishino - Kyoto University
T Kunigo - Kyoto University
R Monden - Kyoto University
T Sumida - Kyoto University
R Takashima - Kyoto University
T Tashiro - Kyoto University
Contributors: U Mallik (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: Journal of instrumentation, Vol.11(5), P05013
DOI: 10.1088/1748-0221/11/05/P05013
ISSN: 1748-0221
eISSN: 1748-0221
Publisher: IOP Publishing
Language: English
Date published: 05/20/2016
Academic Unit: Physics and Astronomy
Record Identifier: 9984199754802771

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