The Physics Performance Of And Level 2 Trigger For The Inner Detector Of Atlas (particle Detector, Muon Tracking, Cern)

In this thesis I describe a study on the physics performance of the ATLAS inner detector and a study on aspects of the second level trigger for the ATLAS inner detector. I present a short discussion of the standard model of particle physics, the Large Hadron Collider (LHC) at CERN and the physics potential of LHC. I introduce the ATLAS experiment, which is one of the four future LHC experiments. The ATLAS detector consists of an inner tracker (inner detector), calorimeters and a muon spectrometer. I present a parameterisation of the reconstruction accuracy of the ATLAS inner tracker for muon tracks. A method is described for calculating from a given set of parameters, representing a muon track in the inner tracker, a smeared set of parameters, as would be obtained from real measurements. Results are presented. I shortly describe supersymmetry and discuss the possibility to find evidence for the existence of super-symmetry with ATLAS. I describe the ATLAS trigger and data acquisition system. The task of the ATLAS trigger system is the online selection of events potentially containing an interesting collision. The ATLAS trigger system consists of three levels. I discuss several options for the architecture of the second level trigger system. I shortly describe a small-scale prototype of the second level trigger system. I present results of calculations of the number of data buffers of the inner tracker that receive a request to supply data for analysis by the second level trigger system. I present second level trigger algorithms for reconstruction of tracks in the precision tracker (part of the inner tracker). These algorithms are optimised for execution speed. An analysis of the physics performance as well as the execution speed is presented.