The CDF Run II silicon detector: aging studies

The CDF Run II silicon detector is the largest operating silicon detector in High Energy Physics. Its 722,000 channels spread over 7 m² of silicon micro-strip sensors allow precision tracking and vertexing. The CDF silicon detector played a critical role in the discovery of B_s mixing and is used extensively for the current Higgs Boson searches. Over the last 5 years, the detector efficiency has remained stable at 95% after the Run II commissioning period. The observed effects of aging are presented followed by the expected performance to the end of the Tevatron Run II program, where 5.5 - 6.5 fb^-1 is expected to be delivered. The impact of radiation damage upon the performance of the detector is shown including the status and expectations of the two inner most layers which have already inverted. The infrastructure (cooling, power supplies) aging problems dealt with during the 2007 sumer shutdown are discussed.