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Evolution of surface structure in laser-preheated perturbed materials.

C A Di Stefano1, E C Merritt1, F W Doss1

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87501, USA.

Physical Review. E
|March 17, 2017
PubMed
Summary
This summary is machine-generated.

Laser preheat significantly impacts material layer hydrodynamics. Surface perturbations lead to complex internal structures and instability-like surface behavior, influencing inertial confinement fusion and laser experiments.

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Area of Science:

  • Physics
  • Plasma Physics
  • Hydrodynamics

Background:

  • Laser-driven hydrodynamics is crucial for inertial confinement fusion (ICF) research.
  • Understanding material behavior under laser preheat is essential for ICF target design and diagnostics.
  • Surface perturbations can significantly alter hydrodynamic evolution.

Purpose of the Study:

  • To experimentally and computationally investigate the effects of laser preheat on a material layer's hydrodynamic behavior.
  • To analyze the complex interactions arising from surface perturbations under laser preheat.
  • To assess the validity of a uniform one-temperature preheat model in capturing observed phenomena.

Main Methods:

  • Experimental study of a material layer subjected to laser preheat.
  • Computational modeling to simulate hydrodynamic behavior.
  • Analysis of density, pressure, and temperature structures within the material layer.
  • Investigation of surface instability-like behavior and mode coupling.

Main Results:

  • Surface perturbations induce complex hydrodynamic responses, including internal structure formation (density, pressure, temperature).
  • The material surface exhibits instability-like behavior, characterized by mode coupling.
  • A uniform one-temperature preheat model successfully reproduces experimental observations.
  • Evidence of complexities within the preheat behavior was observed.

Conclusions:

  • Laser preheat significantly influences the hydrodynamic evolution of material layers, especially when surface perturbations are present.
  • The uniform one-temperature preheat model provides a viable framework for understanding these complex interactions.
  • These findings have critical implications for diagnosing ICF plasmas and interpreting laser hydrodynamics experiments.