  WIMP-nucleon cross sections in the range 10^{-46} - 10^{-44} cm^2 may be
probed by a ton-scale experiment with low energy thresholds and excellent
discrimination of backgrounds. Because CDMS ZIP detectors are the most proven
means of achieving such good discrimination, we intend to scale CDMS up to a
ton detector mass. Development of this experiment, dubbed "SuperCDMS," is
discussed. Improved analysis and optimization of the charge collection and
athermal phonon sensors should improve surface-background rejection by over two
orders of magnitude. Siting the SuperCDMS experiment deep enough to remove the
fast neutron background, and reducing radioactive beta contamination near or on
the detectors, should sufficiently reduce these otherwise troubling
backgrounds. The primary challenge is making the experiment easy enough to
build. We discuss methods of improving the detector manufacturability, removing
the need for large-scale cryogenic detector testing, and allowing simplified
infrastructure by using more sophisticated readout.
