A New Inner Layer Silicon Micro-strip Detector for D0

The D0 experiment at the Fermilab Tevatron has built a new inner layer detector (Layer 0) which is being installed inside the existing D0 Silicon Micro-strip Tracker. This one layer detector will reside inside the 2.2cm radius opening and will provide superior radiation hardness to the existing silicon detector, thus insuring that the silicon tracker remains viable through Tevatron Run II. There are several unique features to the design of the detector, which resides on a carbon fiber support structure, which maximize the signal-to-noise characteristics and reduce sensitivity to pickup. We also review radiation damage measurements of the current detector at an integrated luminosity of one inverse femtobarn