Aad, G;
Abbott, B;
Abdallah, J;
Abdinov, O;
Abeloos, B;
Aben, R;
Abolins, M;
... Zwalinski, L; + view all
(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. 10.1088/1748-0221/11/05/P05013.
![[thumbnail of Korn_Aad_2016_J._Inst._11_P05013.pdf]](https://discovery.ucl.ac.uk/style/images/fileicons/text.png) |
Text
Korn_Aad_2016_J._Inst._11_P05013.pdf - Published Version Download (2MB) |
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.
| Type: | Article |
|---|---|
| Title: | Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1748-0221/11/05/P05013 |
| Publisher version: | https://doi.org/10.1088/1748-0221/11/05/P05013 |
| Language: | English |
| Additional information: | Published under the terms of the Creative Commons Attribution 3.0 License (http://creativecommons.org/licenses/by/3.0/) by IOP Publishing Ltd and Sissa Medialab srl. Any further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation and DOI. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10080182 |
Archive Staff Only
 |
View Item |
