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Upstream ionization instability associated with a current-free double layer.

A Aanesland1, C Charles, M A Lieberman

  • 1SP3, Research School of Physical Sciences and Engineering, The Australian National University, Australian Capital Territory 0200, Australia. ane.aanesland@anu.edu.au

Physical Review Letters
|October 10, 2006
PubMed
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A low-frequency instability in helicon plasma is linked to current-free double layers. Electrons accelerated by the double layer cause upstream ionization, explaining the observed instability.

Area of Science:

  • Plasma Physics
  • Space Physics
  • Astrophysics

Background:

  • Helicon plasmas are widely used in various applications, including space propulsion and materials processing.
  • Low-frequency instabilities can degrade plasma performance and affect experimental outcomes.
  • Current-free double layers (DLs) are observed in various plasma environments and play a crucial role in particle acceleration.

Purpose of the Study:

  • To investigate the cause of a low-frequency instability observed in a low-pressure expanding helicon plasma.
  • To determine the relationship between the instability and the presence of a current-free double layer (DL).
  • To develop and validate a theoretical model explaining the observed phenomenon.

Main Methods:

  • Utilized electrostatic probes for plasma measurements.

Related Experiment Videos

  • Observed and characterized the low-frequency instability.
  • Measured the potential drop of the current-free double layer.
  • Developed a theoretical model for upstream ionization instability.

    • Main Results:

    • A low-frequency instability was observed and linked to a current-free double layer (DL).
    • The instability's frequency showed a linear dependence on the DL's potential drop.
    • Simultaneous measurements confirmed the coexistence of the instability and the DL.
    • The developed theory accurately predicted the experimental observations.

    Conclusions:

    • The observed low-frequency instability in helicon plasma is caused by an upstream ionization instability.
    • Electrons accelerated through the current-free double layer are responsible for enhanced upstream ionization.
    • The theoretical model provides a good explanation for the experimental findings, advancing understanding of plasma instabilities.