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

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...

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Detalles Bibliográficos
Autor principal: Aad, G.
Formato: JOUR
Materias:
Beam-intensity monitors
Beam-line instrumentation (beam position and profile monitors
Bunch length monitors)
Data analysis
Performance of high energy physics detectors
Cosmology
Data reduction
High energy physics
Intelligent systems
Monte Carlo methods
Beam intensity
Beam positions
Bunch length
Cosmic Ray Background
Cosmic-ray muons
High energy physics detector
Radio frequencies
Residual pressures
Cosmic rays
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_17480221_v11_n5_p_Aad
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_17480221_v11_n5_p_Aad
record_format dspace
spelling todo:paper_17480221_v11_n5_p_Aad2023-10-03T16:32:08Z Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period Aad, G. Beam-intensity monitors Beam-line instrumentation (beam position and profile monitors Bunch length monitors) Data analysis Performance of high energy physics detectors Cosmology Data reduction High energy physics Intelligent systems Monte Carlo methods Beam intensity Beam positions Bunch length Cosmic Ray Background Cosmic-ray muons High energy physics detector Radio frequencies Residual pressures Cosmic rays 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. © 2016 CERN for the benefit of the ATLAS collaboration. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_17480221_v11_n5_p_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Beam-intensity monitors
Beam-line instrumentation (beam position and profile monitors
Bunch length monitors)
Data analysis
Performance of high energy physics detectors
Cosmology
Data reduction
High energy physics
Intelligent systems
Monte Carlo methods
Beam intensity
Beam positions
Bunch length
Cosmic Ray Background
Cosmic-ray muons
High energy physics detector
Radio frequencies
Residual pressures
Cosmic rays
spellingShingle Beam-intensity monitors
Beam-line instrumentation (beam position and profile monitors
Bunch length monitors)
Data analysis
Performance of high energy physics detectors
Cosmology
Data reduction
High energy physics
Intelligent systems
Monte Carlo methods
Beam intensity
Beam positions
Bunch length
Cosmic Ray Background
Cosmic-ray muons
High energy physics detector
Radio frequencies
Residual pressures
Cosmic rays
Aad, G.
Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period
topic_facet Beam-intensity monitors
Beam-line instrumentation (beam position and profile monitors
Bunch length monitors)
Data analysis
Performance of high energy physics detectors
Cosmology
Data reduction
High energy physics
Intelligent systems
Monte Carlo methods
Beam intensity
Beam positions
Bunch length
Cosmic Ray Background
Cosmic-ray muons
High energy physics detector
Radio frequencies
Residual pressures
Cosmic rays
description 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. © 2016 CERN for the benefit of the ATLAS collaboration.
format JOUR
author Aad, G.
author_facet Aad, G.
author_sort Aad, G.
title Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period
title_short Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period
title_full Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period
title_fullStr Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period
title_full_unstemmed Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period
title_sort beam-induced and cosmic-ray backgrounds observed in the atlas detector during the lhc 2012 proton-proton running period
url http://hdl.handle.net/20.500.12110/paper_17480221_v11_n5_p_Aad
work_keys_str_mv AT aadg beaminducedandcosmicraybackgroundsobservedintheatlasdetectorduringthelhc2012protonprotonrunningperiod
_version_ 1782024130623700992

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