CERN Accelerating science

Article
Report number arXiv:1512.08014
Title MPX Detectors as LHC Luminosity Monitor
Author(s) Sopczak, Andre (IEAP CTU, Prague) ; Ali, Babar (IEAP CTU, Prague) ; Asbah, Nedaa (Montreal U.) ; Bergmann, Benedikt (IEAP CTU, Prague) ; Bekhouche, Khaled (Biskra U.) ; Caforio, Davide (IEAP CTU, Prague) ; Campbell, Michael (CERN) ; Heijne, Erik (IEAP CTU, Prague) ; Leroy, Claude (Montreal U.) ; Lipniacka, Anna (Bergen U.) Show all 18 authors
Publication 2015
Imprint 25 Dec 2015
Number of pages 17
Note Comments: Presented at the IEEE 2015 Nuclear Science Symposium, San Diego, USA
In: IEEE Trans. Nucl. Sci. 62 (2015) pp.3225-3241
In: 2015 IEEE Nuclear Science Symposium and Medical Imaging Conference, San Diego, CA, USA, 31 Oct - 7 Nov 2015
DOI 10.1109/TNS.2015.2496316
Subject category Detectors and Experimental Techniques
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Abstract A network of 16 Medipix-2 (MPX) silicon pixel devices was installed in the ATLAS detector cavern at CERN. It was designed to measure the composition and spectral characteristics of the radiation field in the ATLAS experiment and its surroundings. This study demonstrates that the MPX network can also be used as a self-sufficient luminosity monitoring system. The MPX detectors collect data independently of the ATLAS data-recording chain, and thus they provide independent measurements of the bunch-integrated ATLAS/LHC luminosity. In particular, the MPX detectors located close enough to the primary interaction point are used to perform van der Meer calibration scans with high precision. Results from the luminosity monitoring are presented for 2012 data taken at sqrt(s) = 8 TeV proton-proton collisions. The characteristics of the LHC luminosity reduction rate are studied and the effects of beam-beam (burn-off) and beam-gas (single bunch) interactions are evaluated. The systematic variations observed in the MPX luminosity measurements are below 0.3% for one minute intervals.
Copyright/License arXiv nonexclusive-distrib. 1.0
publication: © 2016-2024 The Author(s) (License: CC-BY-3.0)



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 Záznam vytvorený 2015-12-29, zmenený 2023-09-14


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