Targets for laser-driven opacity measurements

Statistics – Applications

Scientific paper

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Hohlraums, Inertial Confinement Fusion, Laser Applications, Laser Targets, Opacity, Optical Measurement, Product Development, X Ray Lasers, Fabrication, High Temperature Environments, Illuminating, Niobium, Silver, X Rays

Scientific paper

Special laser targets have been designed and fabricated which allow the opacity of materials to be experimentally determined at elevated temperatures (kT less than or equal to 200 eV). A general description of the technique is presented, as well as the fabrication steps necessary to produce the targets. A uniform high temperature environment is provided by the use of small millimeter-sized hohlraums driven by the Nova laser at Lawrence Livermore National Laboratory. The material sample is placed within the hohlraum and is further illuminated by the x-rays produced by one or two of the Nova beams incident on a second material known as a back lighter. Thus far, silver and niobium opacity samples have been used, and each has required a different fabrication technique.

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