Evolution of silicon sensor characteristics of the CMS silicon strip tracker

The CMS silicon strip tracker is the largest detector of its kind. It is expected to operate at the LHC for more than 10 years. In order to quantify aging effects, it is important to keep track of the evolution of fundamental detector properties under radiation and thermal fluctuations. In these proceedings we present our methods measuring the evolution of our sensors full depletion voltage and leakage current. We will also present a comparison between the change in detector properties as seen so far with the theoretical predictions. As an outlook we introduce our simulations of the evolution of the detector properties in the next 10 years.

► We developed procedures to determine the full depletion voltage of the silicon strip sensors of the CMS tracker in situ.
► We built a software tool to predict the evolution of the full depletion voltage and the leakage current in an integrated way (irradiation and annealing in parallel).
► We compared the leakage current evolution of the CMS strips tracker with the model prediction, and found a very good agreement.