Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 2, Pages 274-277Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.274
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We have made the first detailed measurements of a diffusive supersonic radiation wave in the laboratory. A 10 mg/cm(3) SiO2 foam is radiatively heated by the x-ray flux from a laser-irradiated hohlraum. The resulting radiation wave propagates axially through the optically thick foam and is measured via time-resolved x-ray imaging as it breaks out the far end. The data show that the radiation wave breaks out at the center prior to breaking out at the edges, indicating a significant curvature in the radiation front. This curvature is primarily due to energy loss into the walls surrounding the foam.
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