Development of Low Background Components for the MAJORANA DEMONSTRATOR

The MAJORANA collaboration will search for neutrinoless double beta decay ($0\nu\beta\beta$) of $^{76}$Ge using high purity germanium detectors. In order to achieve a sensitivity of up to $10^{28}$ years in the $0\nu\beta\beta$ half-life, background contributions in the 4 keV region of interest around the 2039 keV Q-value of the decay will need to be below $\sim$1 count per tonne-year. Radio-purity constraints require novel designs for many components of the detector and the development of improved assay capabilities. I will present some of the design challenges and solutions of the MAJORANA experiment, with a focus on the signal cables developed at the University of Washington.