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Quasineutral plasma models.

R F Fernsler1, S P Slinker, G Joyce

  • 1Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 24, 2005
PubMed
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The quasineutral plasma model, widely used for decades, has limitations. New fluid and kinetic models overcome these, offering a more accurate approach to plasma behavior without problematic singularities.

Area of Science:

  • Plasma Physics
  • Computational Physics

Background:

  • The established quasineutral plasma model relies on charge neutrality and the electron Boltzmann relationship.
  • The Boltzmann relationship is often unjustified and limits kinetic treatments, causing singularities in the Bohm condition.

Purpose of the Study:

  • To develop and evaluate more general quasineutral plasma models.
  • To overcome the limitations of the traditional Boltzmann relationship in plasma simulations.

Main Methods:

  • Development of two new fluid-based quasineutral models.
  • Development of a third, fully kinetic quasineutral model.
  • Comparison of models using fluid simulations.

Main Results:

  • The kinetic model and one fluid model directly yield the Bohm condition.

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  • The new models avoid the singularities associated with the traditional approach.
  • Fluid simulations validate the performance of the developed models.

    • Conclusions:

    • General quasineutral models offer significant improvements over the traditional Langmuir model.
    • Kinetic and advanced fluid approaches provide singularity-free derivations of the Bohm condition.
    • These new models enhance the accuracy and applicability of plasma simulations.