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Numerical modeling of a 2D wave of electron thermal conductivity produced by a laser beam in targets of subcritical density

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Journal of Russian Laser Research Aims and scope

Abstract

Radiation absorption, energy transport, and plasma production due to the interaction of a laser beam with a homogeneous medium of light elements is considered on the basis of 2D numerical calculations. We assume that the density of this medium is lower than the critical density of plasma corresponding to the plasma resonance for the wavelength of the laser radiation. Calculations are performed within the framework of the HEAT-3D program which includes the equation for 2D thermal conductivity with the source of energy provided by the inverse bremsstrahlung absorption of the laser beam in the medium.

Modeling of the interaction of laser beams of intensity 1014–5·1015 W/cm2, wavelengths λ=1.053 μm and 0.527 μm, and radii 10−2–6·10−2 cm with media of light elements of density 10−3–10−2 g/cm3 is realized. An analysis of the calculation results showed that the space temperature distribution in the plasma is determined by the energy-transport anisotropy. The degree of anisotropy depends, in turn, on the ratio of the beam radius to the length of laser-radiation absorption, which is a function of density and temperature of the plasma produced. The calculation results are compared with experimental data on the laser-beam interaction with low-density targets.

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Authors and Affiliations

  1. P. N. Lebedev Physical Institute, Russian Academy of Sciences, Leninskii Pr. 53, 117924, Moscow, Russia

    S. Yu. Gus'kov & V. B. Rozanov

  2. Institute of Mathematical Modeling, Russian Academy of Sciences, Miusskaya Pl. 4, 125047, Moscow, Russia

    I. V. Popov, V. F. Tishkin & N. V. Zmitrenko

Authors
  1. S. Yu. Gus'kov
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  2. I. V. Popov
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  3. V. B. Rozanov
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  4. V. F. Tishkin
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  5. N. V. Zmitrenko
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Translated from a manuscript submitted October 23, 1999.

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Gus'kov, S.Y., Popov, I.V., Rozanov, V.B. et al. Numerical modeling of a 2D wave of electron thermal conductivity produced by a laser beam in targets of subcritical density. J Russ Laser Res 21, 157–167 (2000). https://doi.org/10.1007/BF02508567

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  • DOI: https://doi.org/10.1007/BF02508567

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