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Related Experiment Videos

Anomalous atomic hydrogen shock pattern in a supersonic plasma Jet

Mazouffre1, Boogaarts, van Der Mullen JA

  • 1Department of Applied Physics, Eindhoven University of Technology, P. O. Box 513, 5600 MB Eindhoven, The Netherlands.

Physical Review Letters
|October 4, 2000
PubMed
Summary

Atomic hydrogen transport in supersonic plasma jets shows unexpected behavior. H atoms escape the expansion via diffusion, not following standard shock wave physics, due to density gradients.

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Area of Science:

  • Plasma Physics
  • Atomic Physics
  • Fluid Dynamics

Background:

  • Supersonic plasma jets are crucial for various applications.
  • Understanding atomic hydrogen transport is key in plasma dynamics.
  • Standard fluid dynamics models may not fully capture complex plasma behaviors.

Purpose of the Study:

  • Investigate the transport of ground-state atomic hydrogen in an argon-hydrogen supersonic plasma jet.
  • Analyze the observed shock pattern and its deviation from established theories.
  • Determine the mechanism behind atomic hydrogen behavior in the plasma jet.

Main Methods:

  • Utilized two-photon laser-induced fluorescence (TALIF) spectroscopy.
  • Generated a supersonic plasma jet from an argon-hydrogen (Ar-H2) mixture.

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  • Measured axial-velocity, temperature, and density profiles of hydrogen atoms.

    • Main Results:

    • Observed an unexpected shock pattern in the atomic hydrogen transport.
    • Axial-velocity and temperature profiles aligned with supersonic expansion predictions.
    • Hydrogen atom density profiles violated the Rankine-Hugoniot relation, indicating non-conservation of forward flux.

    Conclusions:

    • Atomic hydrogen escapes the supersonic expansion through diffusion.
    • Strong density gradients between the jet core and periphery drive this diffusion.
    • The findings highlight limitations of standard fluid dynamics in describing certain plasma phenomena.