Heating the gold walls of a Hohlraum with intense laser beams produces a rapidly expanding gold plasma. Eventually, the wall material will converge on the axis of the Hohlraum with a density sufficient to be opaque to any standard radiography source. The gold expansion makes radiography of the back wall through the laser entrance hole of a Hohlraum driven from one side difficult. This experiment demonstrates a reduction of influx when the Hohlraum walls are coated with of parylene-. The reduction is quantified, using an x-ray framing camera, in a cylindrical Hohlraum driven by of laser light.
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2004
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