From the ALEPH experiment at the LEP to the design of the ATLAS detector for the LHC

This document summarizes ten years of activities in the field of experimental particle physics, which I have done just after my thesis defense in 1999. After a short introduction describing my thesis work and my activities during these ten years, the first chapter describes an analysis made in the ALEPH experiment about the measurement of the Bose-Einstein correlations in W pair decays, using an event mixing method. Nevertheless, the main part of the text is dedicated to the work I have done in the ATLAS experiment at the LHC, between the years 2000 and 2010. Four parts are distinguished. First, an analysis concerning some searches for possible supersymmetric top decays with R-parity violation is described. Then a second part is written about the test bench of the tile calorimeter front-end electronics, and its installation in the ATLAS experiment. Thirdly, the work done in the transition radiation tracker concerning the validation and the installation of the end-cap front-end electronics is fully explained. Finally, the activities of software development concerning the converted photon reconstruction are shown. The last chapter before the conclusion is a summary of my teaching, student supervision and outreach activities. (author)