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Nonlocal thermodynamic equilibrium self-consistent average-atom model for plasma physics.

G Faussurier1, C Blancard, E Berthier

  • 1Commissariat à l'Energie Atomique, 91680 Bruyères-le-Châtel, Boîte Postale 12, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 20, 2001
PubMed
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This study presents a time-dependent collisional-radiative average-atom model to analyze highly charged ion plasmas. The model captures off-equilibrium plasma dynamics, including atomic structure and key atomic processes.

Area of Science:

  • Plasma Physics
  • Atomic Physics
  • Computational Physics

Background:

  • Studying highly charged ion plasmas requires models that capture complex atomic processes.
  • Off-equilibrium conditions are crucial for understanding dynamic plasma behavior.

Purpose of the Study:

  • To develop and apply a time-dependent collisional-radiative average-atom model.
  • To investigate statistical properties of highly charged ion plasmas under off-equilibrium conditions.
  • To analyze the influence of atomic structure and specific atomic processes.

Main Methods:

  • A time-dependent collisional-radiative average-atom model was developed.
  • Electron populations and covariance matrix were approximated using a master equation.
  • Atomic structure was described using screened-hydrogenic models with l-splitting or self-consistent average-atom potentials.

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  • Collisional and radiative rates, including autoionization and dielectronic recombination, were formulated within an average-configuration framework.

    • Main Results:

    • The model provides time evolution of electron populations and covariance matrix for plasmas.
    • Steady-state solutions approximate local thermodynamic equilibrium.
    • Calculations explored the impact of atomic structure, autoionization, and dielectronic recombination on plasma properties.
    • Steady-state average ionization and ionization variance were computed for hot plasmas with and without radiation fields.

    Conclusions:

    • The developed model effectively studies statistical properties of highly charged ion plasmas in off-equilibrium states.
    • Atomic structure and processes like autoionization significantly influence plasma properties.
    • The model provides insights into plasma behavior under various conditions, including the presence of radiation.