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Dense plasma opacity via the multiple-scattering method.

Nathaniel R Shaffer1, Charles E Starrett2

  • 1Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA and Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA.

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Summary
This summary is machine-generated.

Calculating optical properties of hot dense plasmas is challenging. A new electronic structure model shows good agreement for Cr and Ni opacities, but discrepancies remain for Fe.

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Area of Science:

  • High energy density physics
  • Plasma physics
  • Computational materials science

Background:

  • Accurate calculation of optical properties for hot dense plasmas is a significant challenge.
  • Existing models struggle with self-consistent plasma physics, impacting opacity predictions.
  • High energy density science requires reliable methods for understanding extreme states of matter.

Purpose of the Study:

  • To calculate the opacity of hot dense plasmas using a novel electronic structure model.
  • To validate the developed model against experimental opacity data.
  • To investigate the self-consistent plasma physics effects on opacity calculations for elements like Cr, Ni, and Fe.

Main Methods:

  • Utilized a recently developed electronic structure model incorporating multiple scattering theory.
  • Solved Kohn-Sham density functional theory equations for dense plasma conditions.
  • Calculated plasma opacities and compared them with experimental measurements.

Main Results:

  • The model demonstrated good agreement with experimental opacity data in the quasicontinuum region for Chromium (Cr) and Nickel (Ni).
  • Discrepancies were observed between the model's predictions and experimental results for Iron (Fe).
  • The study highlights the limitations of current self-consistent plasma physics models in explaining Fe opacity.

Conclusions:

  • The developed electronic structure model shows promise for calculating plasma opacities in hot dense regimes.
  • Further refinement of self-consistent plasma physics is needed to accurately model elements like Iron.
  • This work contributes to advancing the understanding of optical properties in high energy density plasmas.