UCLA

We report our experience commissioning and operating the CDF Run II silicon detector during the first three years of Run II. The performance of the system and its impact on physics analysis are reviewed. As the luminosity delivered by the Tevatron increases, measurable effects of radiation damage have been observed. Studies of charge collection and noise versus applied bias voltage at several different integrated luminosities are presented. These results and their impact on the expected lifetime of the detector are discussed. (c) 2005 Elsevier B.V. All rights reserved.