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Heat flow diagnostics for helicon plasmas.

Daniel F Berisford1, Roger D Bengtson, Laxminarayan L Raja

  • 1The University of Texas at Austin, Austin, Texas 78712, USA.

The Review of Scientific Instruments
|December 3, 2008
PubMed
Summary

Experimental studies reveal that dielectric tube heating in argon helicon discharges increases with lower magnetic fields and higher gas flow rates. These findings suggest cross-field particle diffusion significantly impacts energy flux to the wall.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research

Background:

  • Helicon discharges are a type of radio frequency (RF) plasma source used in various applications, including space propulsion and materials processing.
  • Understanding power balance in these discharges is crucial for optimizing their performance and efficiency.
  • Previous studies have focused on different aspects of helicon discharge physics, but detailed measurements of power loss to the dielectric walls are less common.

Purpose of the Study:

  • To experimentally investigate the power balance in an argon helicon discharge.
  • To quantify the heating of the dielectric tube walls as an indicator of power loss.
  • To identify operating conditions that influence energy transfer to the tube walls.

Main Methods:

  • Utilized an infrared camera to measure surface temperature profiles of the dielectric tube before and after RF pulse application.

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  • Employed thermocouples and probes to measure power losses downstream from the antenna.
  • Conducted experiments on two distinct helicon systems: the 10 kW VASIMR VX-50 and a 1 kW system at the University of Texas at Austin.
  • Varied operating parameters such as magnetic field strength, gas flow rate, and gas type (argon).

    • Main Results:

    • Dielectric tube heating was observed to increase as magnetic field strength decreased.
    • Higher gas flow rates led to increased dielectric tube heating.
    • The heating of the dielectric tube was also found to increase with higher molecular mass gases.
    • Preliminary results indicate that cross-field particle diffusion plays a significant role in the energy flux reaching the wall.

    Conclusions:

    • Cross-field particle diffusion is a substantial contributor to the energy flux impacting the dielectric walls in helicon discharges.
    • The experimental methodology provides a valuable tool for diagnosing power losses in RF plasma systems.
    • Further research is warranted to fully elucidate the mechanisms of energy transport and loss in helicon discharges under various conditions.