The CDF silicon detector upgrade

A major silicon upgrade project is under way for the CDFII experiment that will operate during Run II of the Tevatron in the year 2000. The innermost detector, SVXII, will cover the interaction region with three barrels of five layers of double-sided microstrip detectors. In the radial gap between the SVXII and the new main tracking chamber (COT) will be located the ISL that consists of two planes of double-sided microstrip detectors at large pseudorapidity and one in the central region. A description of the project design and its motivation is presented here.