  We propose to construct a heavy flavor tracker for the STAR experiment at
RHIC in order to measure the elliptic flow of charmed hadrons in the low pt
region and identify B-meson contributions in the region pt > 4 GeV/c. In this
talk, we will present the design of the detector in-depth and its expected
performance as studied in detailed simulations and analytic calculations.
Physics potentials of the detector will also be discussed.
