Materials Problems with Inertial Confinement Fusion Targets

摘要

Gold and tungsten were investigated for use as inner, high-Z shells, and as yet unsolved problems were encountered with both materials. Pure electroplated gold lacks sufficient tensile strength to be useful by itself and in addition became porous foam when heated to 923 exp 0 K in hydrogen. Tungsten, which can be deposited by chemical reduction of WF sub 6 , does not show substantial morphological changes on exposure to hot hydrogen, but exhibits extremely low permeability to hydrogen in coatings thicker than 25 mu m. This low permeability limits the maximum achievable fuel content to an amount that can be contained by a shell with wall thickness less than or equal to 25 mu m. (ERA citation 04:025055)