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

G Aad; B. Abbott; J Abdallah; O Abdinov; B Abeloos; R Aben; Torsten Åkesson; Simona Bocchetta; Lene Bryngemark; Caterina Doglioni; Anders Floderus; Anthony Hawkins; Vincent Hedberg; Jenny Ivarsson; Göran Jarlskog; Else Lytken; Ulf Mjörnmark; Oxana Smirnova; Oleksandr Viazlo; ATLAS Collaboration

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

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

G Aad, B. Abbott, J Abdallah, O Abdinov, B Abeloos, R Aben, Torsten Åkesson, Simona Bocchetta, Lene Bryngemark, Caterina Doglioni, Anders Floderus, Anthony Hawkins, Vincent Hedberg, Jenny Ivarsson, Göran Jarlskog, Else Lytken, Ulf Mjörnmark, Oxana Smirnova, Oleksandr Viazlo, ATLAS Collaboration

Research output: Contribution to journal › Article › peer-review

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. © 2016 CERN for the benefit of the ATLAS collaboration.

Original language	English
Journal	Journal of Instrumentation
Volume	11
Issue number	5
DOIs	https://doi.org/10.1088/1748-0221/11/05/P05013
Publication status	Published - 2016

Bibliographical note

Export Date: 23 May 2018

Subject classification (UKÄ)

Subatomic Physics

Free keywords

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

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10.1088/1748-0221/11/05/P05013

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Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., Aben, R., Åkesson, T., Bocchetta, S., Bryngemark, L., Doglioni, C., Floderus, A., Hawkins, A., Hedberg, V., Ivarsson, J., Jarlskog, G., Lytken, E., Mjörnmark, U., Smirnova, O., Viazlo, O., & ATLAS Collaboration (2016). Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period. Journal of Instrumentation, 11(5). https://doi.org/10.1088/1748-0221/11/05/P05013

@article{ce02b64675404ccf93094801a9c3e23f,

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

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. {\textcopyright} 2016 CERN for the benefit of the ATLAS collaboration.",

keywords = "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",

author = "G Aad and B. Abbott and J Abdallah and O Abdinov and B Abeloos and R Aben and Torsten {\AA}kesson and Simona Bocchetta and Lene Bryngemark and Caterina Doglioni and Anders Floderus and Anthony Hawkins and Vincent Hedberg and Jenny Ivarsson and G{\"o}ran Jarlskog and Else Lytken and Ulf Mj{\"o}rnmark and Oxana Smirnova and Oleksandr Viazlo and {ATLAS Collaboration}",

note = "Export Date: 23 May 2018",

year = "2016",

doi = "10.1088/1748-0221/11/05/P05013",

language = "English",

volume = "11",

journal = "Journal of Instrumentation",

issn = "1748-0221",

publisher = "IOP Publishing",

number = "5",

}

Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Abeloos, B, Aben, R, Åkesson, T, Bocchetta, S, Bryngemark, L , Doglioni, C, Floderus, A, Hawkins, A, Hedberg, V, Ivarsson, J, Jarlskog, G , Lytken, E, Mjörnmark, U, Smirnova, O, Viazlo, O & ATLAS Collaboration 2016, 'Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period', Journal of Instrumentation, vol. 11, no. 5. https://doi.org/10.1088/1748-0221/11/05/P05013

TY - JOUR

T1 - Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period

AU - Aad, G

AU - Abbott, B.

AU - Abdallah, J

AU - Abdinov, O

AU - Abeloos, B

AU - Aben, R

AU - Åkesson, Torsten

AU - Bocchetta, Simona

AU - Bryngemark, Lene

AU - Doglioni, Caterina

AU - Floderus, Anders

AU - Hawkins, Anthony

AU - Hedberg, Vincent

AU - Ivarsson, Jenny

AU - Jarlskog, Göran

AU - Lytken, Else

AU - Mjörnmark, Ulf

AU - Smirnova, Oxana

AU - Viazlo, Oleksandr

AU - ATLAS Collaboration

N1 - Export Date: 23 May 2018

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

KW - Beam-intensity monitors

KW - Beam-line instrumentation (beam position and profile monitors

KW - Bunch length monitors)

KW - Data analysis

KW - Performance of high energy physics detectors

KW - Cosmology

KW - Data reduction

KW - High energy physics

KW - Intelligent systems

KW - Monte Carlo methods

KW - Beam intensity

KW - Beam positions

KW - Bunch length

KW - Cosmic Ray Background

KW - Cosmic-ray muons

KW - High energy physics detector

KW - Radio frequencies

KW - Residual pressures

KW - Cosmic rays

U2 - 10.1088/1748-0221/11/05/P05013

DO - 10.1088/1748-0221/11/05/P05013

M3 - Article

SN - 1748-0221

VL - 11

JO - Journal of Instrumentation

JF - Journal of Instrumentation

IS - 5

ER -

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

Abstract

Bibliographical note

Subject classification (UKÄ)

Free keywords

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Cite this