13 September 2005 Hot dense plasma opacity measurements using x-ray lasers
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Abstract
Experimental measurements of the opacity of plasmas at densities close to solid state and temperatures ~ 60 - 300 eV using a probing X-ray laser are presented. Utilizing thin targets, opacities of iron have been measured using x-ray lasers of photon energy 89 eV created by pumping with the VULCAN RAL laser. The thin targets are separately heated by spot focus laser pulses. We have demonstrated that X-ray laser brightness is sufficient to overcome the self-emission of hot plasma so that useful opacity measurements can be made. Due to their high brightness, x-ray lasers can fulfill a useful niche in measuring opacity and other phenomena associated with laser-plasma interactions. Quantities such as opacity measured in laser-plasmas are useful elsewhere. For example, plasma opacity is important in understanding radiative transfer in the sun.
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G. J. Tallents, M. H. Edwards, P. Mistry, D. S. Whittaker, N. Booth, G. J. Pert, B. Rus, T. Mocek, M. Kozlova, C. L. S. Lewis, C. McKenna, A. Delseriey, M. Notley, D. Neely, "Hot dense plasma opacity measurements using x-ray lasers", Proc. SPIE 5919, Soft X-Ray Lasers and Applications VI, 59190G (13 September 2005); doi: 10.1117/12.619259; https://doi.org/10.1117/12.619259
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