Quality assurance and irradiation studies on CMS silicon strip sensors

The high luminosity at the Large Hadron Collider at the European Particle Physics Laboratory CERN in Geneva causes a harsh radiation environment for the detectors. The most inner layers of the tracker are irradiated to an equivalent fluence of 1.6e14 1MeV-neutrons per cmˆ2. The radiation causes damage in the silicon lattice of the sensors. This increases the leakage current and changes the full depletion voltage. Both of these parameters are after irradiation neither stable with time nor with temperatures above 0oC. This thesis presents the changes of the leakage currents, the full depletion voltages, and all strip parameters of the sensors after proton and neutron irradiation. After irradiation annealing studies have been carried out. All observed effects are used to simulate the evolution of full depletion voltage for different annealing times and annealing temperatures in order to keep the power consumption as low as possible. From the observed radiation damage and annealing effects the sensors of the tracker are expected to have a sufficient signal to noise ratio after the service life of ten years.