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Wuppertal 2015 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 15: Halbleiter: Laufende Experimente 1

T 15.1: Vortrag

Montag, 9. März 2015, 14:00–14:15, K.12.20 (K2)

Precision of MPX Detectors as LHC Luminosity Monitor — •Andre Sopczak1, Babar Ali1, Nedaa Asbah2, Petr Benes1, Benedikt Bergmann1, Bartolomej Biskup1, Michael Campbell3, Davide Caforio1, Erik Heijne1, Edward Kladiva4, Claude Leroy2, Marzio Nessi3, Stanislav Pospisil1, Frank Seifert1, Jaroslav Solc1, Paul Soueid2, Michal Suk1, Daniel Turecek1, and Zdenek Vykydal11IEAP CTU in Prague — 2University of Montreal — 3CERN — 4IEP SAS Kosice

A network consisting of MPX detectors based on Medipix2 silicon pixel devices were originally adapted for measuring the composition and spectral characteristics of the radiation field in the ATLAS experiment and its surroundings. We demonstrate that the MPX network, which consists of 16 MPX detectors, is a self-contained luminosity monitor system. As the MPX detectors are collecting data independently of the ATLAS data-recording chain, they provide independent measurements of the bunch-integrated ATLAS/LHC luminosity. In particular, the MPX detectors close enough to the primary interaction point are used to perform van der Meer calibration scans with good precision. Results from the luminosity monitoring are presented for 2012 data taken at √s=8 TeV proton-proton collisions. The characteristics of the LHC luminosity reduction are studied and the effects of beam-beam (burn-off) and beam-gas (single bunch) interactions are evaluated. The variations of the MPX luminosity measurements around the fitted curve lead to a relative uncertainty on the luminosity measurement below 0.3% for one minute time intervals.

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