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Related Experiment Videos

Parameters and equilibrium profiles for large-area surface-wave sustained plasmas.

I B Denysenko1, A V Gapon, N A Azarenkov

  • 1School of Physics and Technology, Kharkiv National University, 4 Svobody Square, 61077 Kharkiv, Ukraine.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 15, 2002
PubMed
Summary

This study explains deviations in plasma density profiles using a 2D fluid code. It accounts for diffusion and temperature variations, matching experimental data for large-area radio-frequency discharges.

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Area of Science:

  • Plasma Physics
  • Computational Fluid Dynamics
  • Radio-Frequency Discharges

Background:

  • Large-area radio-frequency (RF) discharges are crucial in various industrial applications.
  • Conventional linear diffusion models often fail to accurately predict plasma density profiles in these systems.
  • Experimental data frequently show deviations from these models, necessitating a more comprehensive approach.

Purpose of the Study:

  • To compute equilibrium plasma parameter profiles in finite-length, metal-shielded dielectric cylinders.
  • To investigate the influence of axial diffusion and radial electron temperature non-uniformity on plasma density profiles.
  • To reconcile simulation results with experimental observations in large-area surface-wave sustained plasmas.

Main Methods:

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  • Utilized a two-dimensional (2D) fluid code to simulate plasma behavior.
  • Modeled RF power coupling via edge-localized surface waves propagating azimuthally.
  • Incorporated self-consistent axial plasma diffusion and radial electron temperature variations into the model.

    • Main Results:

    • The study successfully computed equilibrium plasma parameter profiles.
    • Self-consistent modeling of axial diffusion and radial electron temperature non-uniformity explained observed deviations in radial density profiles.
    • Simulation outcomes demonstrated strong agreement with experimental data from large-diameter, surface-wave sustained plasmas.

    Conclusions:

    • The developed 2D fluid model provides a more accurate representation of plasma dynamics in large-area RF discharges.
    • Accounting for axial diffusion and radial electron temperature variations is essential for predicting plasma density profiles.
    • The findings validate the computational approach against experimental results, enhancing understanding of these complex plasmas.