A new inner layer silicon micro-strip detector for Dط

The Dط experiment at the Fermilab Tevatron is building a new inner layer detector (Layer-0) to be installed inside the existing Dط Silicon Micro-strip Tracker (SMT). The Layer-0 detector is based on R&D performed for the RunIIb silicon upgrade, which was cancelled in the fall of 2003. Layer-0 will be installed between the beam pipe and the 2.2 cm radius opening available in the SMT support structure. The radius of the first sampling will be reduced from 2.7 to 1.6 cm. Layer-0 will be radiation harder than the current SMT, thus ensuring that the silicon tracker remains viable through Tevatron RunII.