Radiation Roles on Reduction of Initial Imprint in Foam-Buffered Targets

概要

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The initial imprint of mass perturbation on a target due to the spatial nonuniformity of laser intensity is a critical issue for laser fusion research. A foam-hybrid target with a low-density foam layer, and that was coated with high-Z material, was proposed to mitigate the laser imprint. In such a target, x-ray radiation played significant roles in the formation of the initial imprint. The perturbation in the absorbed laser energy is diffused by the radiation transport. For short wavelengths, a clear suppression of the perturbation growth was observed in the foam-hybrid target, although the growth rate of Rayleigh-Taylor instability was almost the same as that observed in conventional plastic targets. Hydrodynamic instability at the interface of the material was also suppressed with high-Z coating. Good agreement between the numerical results and the experimental findings suggests the validity of radiation hydrodynamic modeling.
社団法人プラズマ・核融合学会の論文
2001-10-25