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Homogeneous, Micron-Scale High-Energy-Density Matter Generated by Relativistic Laser-Solid Interactions.

N F Beier1,2, H Allison2, P Efthimion3

  • 1Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 2R3, Canada.

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|October 7, 2022
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Summary
This summary is machine-generated.

This study demonstrates uniform heating of keV plasmas using high-intensity lasers, enabling new insights into high-energy-density matter and atomic physics models.

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Area of Science:

  • Plasma Physics
  • High-Energy-Density (HED) Matter
  • Laser-Plasma Interactions

Background:

  • Laser-solid interactions are crucial for studying HED matter.
  • Previous studies faced challenges in achieving uniform heating in dense plasmas.

Purpose of the Study:

  • To demonstrate uniform heating of solid-density plasmas using short-pulse lasers.
  • To investigate the mechanisms behind bulk heating and ionization in HED environments.
  • To differentiate atomic physics models in HED conditions.

Main Methods:

  • Utilized a high-contrast, 400 nm wavelength laser at intensities up to 2x10^21 W/cm^2.
  • Employed high-resolution spectral analysis of X-ray emission.
  • Conducted particle-in-cell (PIC) simulations.

Main Results:

  • Achieved uniform heating of keV plasmas up to 3.0 keV over 1 micrometer depths.
  • PIC simulations predicted uniform heating to depths of 2 micrometers.
  • Observed significant bulk heating and highly ionized ions attributed to trapped hot electrons.

Conclusions:

  • Demonstrated a novel method for uniform plasma heating in HED regimes.
  • Provided experimental evidence supporting the role of electron refluxing in bulk heating.
  • Enabled critical evaluation of atomic physics models in extreme conditions.