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

The 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

The ATLAS collaboration

Aix-Marseille Université and CNRS/IN2P3
University of Oklahoma
University of Iowa
Azerbaijan National Academy of Sciences
Université Paris-Sud and CNRS/IN2P3
University of Amsterdam
Michigan State University
University of California at Santa Cruz
University of Sussex
Tel Aviv University
Technion-Israel Institute of Technology
University of Oregon
Stockholm University
The Oskar Klein Centre
National Institute for Nuclear Physics
King's College London
Abdus Salam International Centre for Theoretical Physics
AGH University of Krakow
Brookhaven National Laboratory
Northern Illinois University
Ludwig Maximilian University of Munich
Didcot
University of Liverpool
University of Belgrade
University of Göttingen
Laboratório de Instrumentação e Física Experimental de Partículas
University of Granada
NOVA University Lisbon
Boston University
Joint Institute for Nuclear Research
University of Rome Tor Vergata
Lund University
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
University of Bologna
University of Victoria BC
Université Grenoble Alpes
Instituto de Física La Plata
CERN
Transilvania University of Brasov
Horia Hulubei National Institute of Physics and Nuclear Engineering
National Technical University of Athens
University of Salento
The University of Chicago
Columbia University
University of Birmingham
University of Naples Federico II
University of Copenhagen
Kobe University
University of Washington
University of Valencia
Lawrence Berkeley National Laboratory
High Energy Accelerator Research Organization, Tsukuba
Universidade Federal do Rio de Janeiro
Brandeis University
University of Michigan, Ann Arbor
University of Coimbra
University of Lisbon
University of Sheffield
University of Geneva
University of Texas at Austin
Heidelberg University
University of Milan
National and Kapodistrian University of Athens
Technische Universität Dresden
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Novosibirsk State University
Institute for High Energy Physics
University of Pisa
Moscow Engineering Physics Institute
Slovak Academy of Sciences
Duke University
University of Montreal
Bogazici University
Queen Mary University of London
University of Freiburg
University of Cambridge
University of Bonn
Alikhanov Institute for Theoretical and Experimental Physics
University of Oxford
Johannes Gutenberg University Mainz
The University of Tokyo
German Electron Synchrotron
Comenius University
University of Illinois at Urbana-Champaign
University of Siegen
Czech Technical University in Prague
TRIUMF
CEA Saclay (Commissariat a lʼEnergie Atomique)
University of Rome La Sapienza
CAS - Institute of High Energy Physics
Yale University
Charles University
Stony Brook University
University of Pennsylvania
Polish Academy of Sciences
University of Wisconsin-Madison
University of Louisville
University of Wuppertal
University of Melbourne
University of Genoa
Max Planck Institute for Physics (Werner Heisenberg Institute)
SLAC National Accelerator Laboratory
University of Manchester
Université Savoie Mont Blanc
Universidad Autónoma de Madrid
Lancaster University
Russian Research Centre Kurchatov Institute
University of Glasgow
University of Toronto
California State University Fresno
Ohio State University
Laboratoire de Physique Nucléaire et de Hautes Energies
Tufts University
University of Bern
University of Fribourg
University of Warwick
New York University
Bahcesehir University
Gaziantep University
McGill University
University College London
Carleton University
University of Massachusetts
University of Hassan II Casablanca
York University Toronto
Uppsala University
Royal Holloway University of London
University of Pittsburgh
Humboldt University of Berlin
University of Sydney
Argonne National Laboratory
Pontificia Universidad Católica de Chile
University of Udine
Institute for High Energy Physics of National Research Centre ‘Kurchatov Institute’
Chinese University of Hong Kong
The University of Hong Kong
Hong Kong University of Science and Technology
Universidad de Buenos Aires
SUNY Albany
Université Clermont Auvergne
University of Texas at Arlington
Tokyo Metropolitan University
Weizmann Institute of Science
University of Edinburgh
Universidad Técnica Federico Santa Maria
University of Bergen
Simon Fraser University
University of Oslo
TU Dortmund University
University of Alberta
University of Calabria
Ankara University
Shanghai Jiao Tong University
Southern Methodist University
Radboud University Nijmegen
Autonomous University of Barcelona
University of California at Irvine
University of Cape Town
University of Porto
Roma Tre University
Universidade Federal de Juiz de Fora
Istanbul Bilgi University
Harvard University
Tomsk State University
Iowa State University
Nanjing University
Tsinghua University
Mohammed V University in Rabat
University of Arizona
Indiana University Bloomington
Czech Academy of Sciences
Palacký University Olomouc
University of Ljubljana
University of Johannesburg
University of Pavia
University of Naples Parthenope
Institute of Particle Physics
University of British Columbia
Mohamed I University
Ivane Javakhishvili Tbilisi State University
Universidade Federal de São João del-Rei
Universidade de São Paulo
Shandong University
Justus Liebig University Giessen
Cadi Ayyad University
The University of Osaka
Peter the Great St. Petersburg Polytechnic University
Nagasaki Institute of Applied Science
University of Science and Technology of China
National Center for Energy, Nuclear Science and Technology
Aristotle University of Thessaloniki
Lomonosov Moscow State University
University of New Mexico
Louisiana Tech University
ICREA
A. Alikhanian Yerevan Institute of Physics
Oklahoma State University
University of Tsukuba
Belarus Academy of Sciences
Shinshu University
Institute of Science Tokyo
Nagoya University
Academia Sinica - Institute of Physics
Belarusian State University
University of the Witwatersrand
National Tsing Hua University
Waseda University
Kyoto University
University of Texas at Dallas
Adelaide University
Innsbruck Medical University
Ilia State University
Kyushu University
Georgian Technical University
Ochanomizu University
Manhattan College
Istanbul Aydin University
University of Würzburg
Hellenic Open University
Universidad Antonio Nariño
KTH Royal Institute of Technology
Hampton University
Moscow Institute of Physics and Technology
Hiroshima Institute of Technology
Okayama University
University of Minho
Jagiellonian University in Kraków
Eötvös Loránd University
International School for Advanced Studies
National Institute for Research and Development of Isotopic and Molecular Technologies
National University of Science and Technology POLITEHNICA Bucharest
West University of Timisoara
University of South Carolina
CNRS/IN2P3
Sun Yat-Sen University
Bulgarian Academy of Sciences
TOBB University of Economics and Technology
Kyoto University of Education
Stanford University
Wigner Research Centre for Physics
Flensburg University of Applied Sciences
University of Malaya

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

20 Scopus citations

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.

Original language	English
Article number	P05013
Journal	Journal of Instrumentation
Volume	11
Issue number	5
DOIs	https://doi.org/10.1088/1748-0221/11/05/P05013
State	Published - 20 May 2016
Externally published	Yes

Keywords

Beam-intensity monitors
Beam-line instrumentation (beam position and profile monitors
Bunch length monitors)
Data analysis
Performance of high energy physics detectors

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10.1088/1748-0221/11/05/P05013

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@article{b3baedd036a647928811ec032fc447ba,

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.",

keywords = "Beam-intensity monitors, Beam-line instrumentation (beam position and profile monitors, Bunch length monitors), Data analysis, Performance of high energy physics detectors",

author = "\{The ATLAS collaboration\} and G. Aad and B. Abbott and J. Abdallah and O. Abdinov and B. Abeloos and R. Aben and M. Abolins and AbouZeid, \{O. S.\} and Abraham, \{N. L.\} and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and Acharya, \{B. S.\} and L. Adamczyk and Adams, \{D. L.\} and J. Adelman and S. Adomeit and T. Adye and Affolder, \{A. A.\} and T. Agatonovic-Jovin and J. Agricola and Aguilar-Saavedra, \{J. A.\} and Ahlen, \{S. P.\} and F. Ahmadov and G. Aielli and H. Akerstedt and {\AA}kesson, \{T. P.A.\} and Akimov, \{A. V.\} and Alberghi, \{G. L.\} and J. Albert and S. Albrand and \{Alconada Verzini\}, \{M. J.\} and M. Aleksa and Aleksandrov, \{I. N.\} and C. Alexa and G. Alexander and T. Alexopoulos and M. Alhroob and M. Aliev and G. Alimonti and J. Alison and Alkire, \{S. P.\} and Allbrooke, \{B. M.M.\} and Allen, \{B. W.\} and Allport, \{P. P.\} and A. Aloisio and A. Alonso and F. Alonso and L. Yuan",

note = "Publisher Copyright: {\textcopyright} 2016 CERN for the benefit of the ATLAS collaboration.",

year = "2016",

month = may,

day = "20",

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

language = "英语",

volume = "11",

journal = "Journal of Instrumentation",

issn = "1748-0221",

publisher = "Institute of Physics",

number = "5",

}

TY - JOUR

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

AU - The ATLAS collaboration

AU - Aad, G.

AU - Abbott, B.

AU - Abdallah, J.

AU - Abdinov, O.

AU - Abeloos, B.

AU - Aben, R.

AU - Abolins, M.

AU - AbouZeid, O. S.

AU - Abraham, N. L.

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abreu, R.

AU - Abulaiti, Y.

AU - Acharya, B. S.

AU - Adamczyk, L.

AU - Adams, D. L.

AU - Adelman, J.

AU - Adomeit, S.

AU - Adye, T.

AU - Affolder, A. A.

AU - Agatonovic-Jovin, T.

AU - Agricola, J.

AU - Aguilar-Saavedra, J. A.

AU - Ahlen, S. P.

AU - Ahmadov, F.

AU - Aielli, G.

AU - Akerstedt, H.

AU - Åkesson, T. P.A.

AU - Akimov, A. V.

AU - Alberghi, G. L.

AU - Albert, J.

AU - Albrand, S.

AU - Alconada Verzini, M. J.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

AU - Alexa, C.

AU - Alexander, G.

AU - Alexopoulos, T.

AU - Alhroob, M.

AU - Aliev, M.

AU - Alimonti, G.

AU - Alison, J.

AU - Alkire, S. P.

AU - Allbrooke, B. M.M.

AU - Allen, B. W.

AU - Allport, P. P.

AU - Aloisio, A.

AU - Alonso, A.

AU - Alonso, F.

AU - Yuan, L.

PY - 2016/5/20

Y1 - 2016/5/20

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.

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.

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

UR - https://www.scopus.com/pages/publications/85009065117

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

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

M3 - 文章

AN - SCOPUS:85009065117

SN - 1748-0221

VL - 11

JO - Journal of Instrumentation

JF - Journal of Instrumentation

IS - 5

M1 - P05013

ER -

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

Abstract

Keywords

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