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; M. Abolins; O.S. AbouZeid; Abraham Nitzan; H. Abramowicz; Mogens Dam; Jørn Dines Hansen; Jørgen Beck Hansen; Stefania Xella; Peter Henrik Hansen; Troels Christian Petersen; Almut Maria Pingel; Alejandro Alonso Diaz; James William Monk; Gorm Aske Gram Krohn Galster; Lotte Ansgaard Thomsen; Ask Emil Løvschall-Jensen; Almut Maria Pingel; Lars Egholm Pedersen; Graig Wiglesworth; Lars Egholm Pedersen

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, M. Abolins, O.S. AbouZeid, Abraham Nitzan, H. Abramowicz, Mogens Dam, Jørn Dines Hansen, Jørgen Beck Hansen, Stefania Xella, Peter Henrik Hansen, Troels Christian Petersen, Almut Maria Pingel, Alejandro Alonso Diaz, James William Monk, Gorm Aske Gram Krohn GalsterLotte Ansgaard Thomsen, Ask Emil Løvschall-Jensen, Almut Maria Pingel, Lars Egholm Pedersen, Graig Wiglesworth, Lars Egholm Pedersen

Experimental Particle Physics

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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.

Original language	English
Article number	P05013
Journal	Journal of Instrumentation
Volume	11
ISSN	1748-0221
DOIs	https://doi.org/10.1088/1748-0221/11/05/P05013
Publication status	Published - 20 May 2016

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Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., Aben, R., Abolins, M., AbouZeid, O. S., Nitzan, A., Abramowicz, H., Dam, M., Hansen, J. D., Hansen, J. B., Xella, S., Hansen, P. H., Petersen, T. C., Pingel, A. M., Alonso Diaz, A., Monk, J. W., ... Pedersen, L. E. (2016). Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period. Journal of Instrumentation, 11, Article P05013. https://doi.org/10.1088/1748-0221/11/05/P05013

Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Abeloos, B, Aben, R, Abolins, M, AbouZeid, OS, Nitzan, A, Abramowicz, H, Dam, M , Hansen, JD , Hansen, JB , Xella, S , Hansen, PH , Petersen, TC, Pingel, AM, Alonso Diaz, A, Monk, JW, Galster, GAGK, Thomsen, LA, Løvschall-Jensen, AE, Pingel, AM, Pedersen, LE, Wiglesworth, G & Pedersen, LE 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, P05013. https://doi.org/10.1088/1748-0221/11/05/P05013

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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.",

author = "G. Aad and B. Abbott and J. Abdallah and O. Abdinov and B Abeloos and R. Aben and M. Abolins and O.S. AbouZeid and Abraham Nitzan and H. Abramowicz and Mogens Dam and Hansen, {J{\o}rn Dines} and Hansen, {J{\o}rgen Beck} and Stefania Xella and Hansen, {Peter Henrik} and Petersen, {Troels Christian} and Pingel, {Almut Maria} and {Alonso Diaz}, Alejandro and Monk, {James William} and Galster, {Gorm Aske Gram Krohn} and Thomsen, {Lotte Ansgaard} and L{\o}vschall-Jensen, {Ask Emil} and Pingel, {Almut Maria} and Pedersen, {Lars Egholm} and Graig Wiglesworth and Pedersen, {Lars Egholm}",

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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 - Nitzan, Abraham

AU - Abramowicz, H.

AU - Dam, Mogens

AU - Hansen, Jørn Dines

AU - Hansen, Jørgen Beck

AU - Xella, Stefania

AU - Hansen, Peter Henrik

AU - Petersen, Troels Christian

AU - Pingel, Almut Maria

AU - Alonso Diaz, Alejandro

AU - Monk, James William

AU - Galster, Gorm Aske Gram Krohn

AU - Thomsen, Lotte Ansgaard

AU - Løvschall-Jensen, Ask Emil

AU - Pingel, Almut Maria

AU - Pedersen, Lars Egholm

AU - Wiglesworth, Graig

AU - Pedersen, Lars Egholm

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.

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

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

M3 - Journal article

SN - 1748-0221

VL - 11

JO - Journal of Instrumentation

JF - Journal of Instrumentation

M1 - P05013

ER -

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

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