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Electromagnetic instability in plasmas heated by a laser field.

A Bendib1, K Bendib-Kalache1, B Cros2

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Laser heating of plasmas can cause electromagnetic instability. This study found high growth rates for unstable electromagnetic modes, especially with increasing laser intensity (α).

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Area of Science:

  • Plasma Physics
  • Laser-Plasma Interactions
  • Electromagnetic Instabilities

Background:

  • Homogeneous plasmas heated by laser waves exhibit complex electromagnetic behaviors.
  • Understanding electromagnetic instability is crucial for applications like inertial confinement fusion.

Purpose of the Study:

  • To investigate electromagnetic instability in laser-heated plasmas.
  • To analyze the effects of electron quiver velocity (v₀) and thermal velocity (vₜ) on instability growth rates.
  • To derive an advanced dispersion relation for electromagnetic waves.

Main Methods:

  • Numerical calculation of the anisotropic electron distribution function using the Vlasov-Landau equation.
  • High ion charge number approximation (Z).
  • Derivation of a dispersion relation including nonlinear terms of v₀².

Main Results:

  • High growth rates (>10¹² s⁻¹) for unstable quasistatic electromagnetic modes were observed for α ≥ 1.
  • Growth rates of approximately 10¹¹ s⁻¹ were found in the mildly collisional regime.
  • The wave-number range of instability significantly expands with increasing α.

Conclusions:

  • Electromagnetic instability is significant in laser-heated plasmas, particularly at higher laser intensities (α).
  • The derived dispersion relation provides a more comprehensive understanding of these instabilities.
  • Numerical simulations confirm substantial growth rates under relevant physical conditions.