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T: Fachverband Teilchenphysik

T 33: Detektorsysteme I

T 33.5: Vortrag

Montag, 29. Februar 2016, 17:50–18:05, VMP8 SR 205

MPX Detectors as LHC Luminosity Monitor — •Andre Sopczak¹, Babar Ali¹, Nedaa Ashba², Benedikt Bergmann¹, Khaled Bekhouche³, Davide Caforio¹, Michael Campbell⁴, Erik Heijne¹, Claude Leroy², Anna Lipniacka⁵, Marzio Nessi⁴, Stanislav Pospisil¹, Frank Seifert¹, Jaroslav Solc¹, Paul Soueid², Michal Suk¹, and Daniel Turecek¹ — ¹IEAP CTU in Prague — ²University of Montreal — ³Biskra University — ⁴CERN — ⁵Bergen University

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 √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.