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New improvements leading to higher polarization frozen spin improvements are being implemented to improve the operating parameters of polarized HD targets. These include the Solid Hydrogen Deuteride (HD) as a material long spin–lattice relaxation times were obtained near 1 K in a few early studies [2–4]. Small ARTICLE IN PRESSfor highly polarized frozen-spin targets was (B0:3 mm diameter) polarized frozen-spin HD samples were subsequently developed for use in the Inertially Confinement-Fusion experiment at the Laboratory for Laser Energetics in the University of Rochester [5]. In 1993, a joint program bega