DESIGN OF AN UPGRADED DØ SILICON MICROSTRIP TRACKER FOR FERMILAB RUN2B

The DØ collaboration has begun designing a new large scale silicon strip tracking system for the DØ detector for Run2b of the Fermilab Tevatron collider, which will deliver an integrated luminosity in excess of 15 fb^-1 to the experiment. The current design of the replacement detector will be presented with emphasis on those issues that drive the design. The tracker will employ about 2200 single sided silicon sensors. Detector readout will utilize the SVX4 chip that is currently being designed for the CDF and DØ Run2b upgrades.