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

Humboldt-Universität zu Berlin | Mathematisch-Naturwissen­schaft­liche Fakultät | Institut für Physik | Experimentelle Elementarteilchenphysik | ATLAS | Theses | Energy Loss Measurements with the ATLAS Transition Radiation Tracker Using Test Beam Data

Daniel Richter (2008)

Energy Loss Measurements with the ATLAS Transition Radiation Tracker Using Test Beam Data

Diplom Thesis, Humboldt Universität zu Berlin.

The Transition Radiation Tracker is the outer drift chamber of the ATLAS inner detector,  employing thin and independent drift tubes. The energy loss of particles in the drift tubes is measured, using the Time-over-Threshold as an estimator for the width of the induced signals. Combined Test Beam data is analysed and complemented by both official and customised Monte Carlo simulations. Systematic studies are carried out with respect to the geometry dependence of the Time-over-Threshold and the methods used to obtain the latter from the raw data. The currently used method is shown to systematically overestimate the Time-over-Threshold and to be significantly affected by noise. A procedure of correcting the Time-over-Threshold for the distance of the particle track to the sense wire is developed. The corrected variable is shown to be independent of the distance of closest approach to the wire within ±6 % variation at most momenta. A track-based estimator for the energy loss in the drift tubes is established and the achievable electron-pion separation power is measured using Combined Test Beam data. A separation of more than one  at particle momenta between 1 and 180 GeV is obtained.