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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Experimentelle Elementarteilchenphysik

Yohany Rodríguez García (2011)

Test of an ALFA Prototype Detector at the CERN SPS

Master thesis, Humboldt-Universität zu Berlin.

ALFA (Absolute Luminosity for ATLAS) is a high-precision scintillating fibre detector which has been designed to determine the LHC absolute luminosity at the ATLAS interaction point. This detector consists of eight Roman Pots arranged in four pairs of detector modules on each side of ATLAS at a distance of 240 m. Each detector module is made of ten layers of two times 64 scintillating fibres each (U and V planes). The fibres are coupled to 64 channels Multi-Anodes PhotoMultipliers Tubes read out by compact front-end electronics. The detector modules approach the LHC beam axis up to 1.5 mm to determine the luminosity from the differential spectrum of elastically scattered protons using the optical theorem. This Master thesis deals with the study of hit multiplicity, layer efficiency and spatial resolution of an ALFA prototype using the data obtained during the test beam performed in 2009 at Super Proton Synchrotron (SPS) of CERN.