New technologies in the Dط central tracker upgrade

The Dط collaboration has undertaken an aggressive upgrade of its central tracking system. The existing tracker will be completely removed and replaced by a 2 T superconducting solenoidal magnet, an 837000 channel silicon vertex system, an 80 000 channel scintillating fiber tracker, followed by a 7680 channel central preshower detector and a 16 000 channel forward preshower detector. In this paper we shall discuss all of the subsystems of the Dط central tracker upgrade, but will emphasize those aspects which involve new technology: radiation hard scintillating fiber, VLPCs and extruded scintillating strips.