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Related Experiment Video

Updated: May 28, 2026

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
08:10

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas

Published on: May 25, 2021

Electron current extraction from a permanent magnet waveguide plasma cathode.

B R Weatherford1, J E Foster, H Kamhawi

  • 1University of Michigan, Ann Arbor, Michigan 48109, USA. brweathe@umich.edu

The Review of Scientific Instruments
|October 7, 2011
PubMed
Summary
This summary is machine-generated.

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This study explores electron cyclotron resonance plasma as a novel plasma cathode electron source. The device achieved over 4 A extraction currents without an internal antenna, enhancing operational lifespan.

Area of Science:

  • Plasma physics
  • Electron sources
  • Microwave plasma

Background:

  • Traditional plasma cathodes often use antennas that erode, limiting lifespan.
  • Electron cyclotron resonance (ECR) plasma offers a potential antenna-free solution.

Purpose of the Study:

  • Investigate ECR plasma in a waveguide as a plasma cathode electron source.
  • Evaluate extraction current capabilities and compare with theoretical estimations.

Main Methods:

  • Generated ECR plasma using external permanent magnets in a cylindrical waveguide.
  • Measured plasma bulk density and extracted electron currents.
  • Used Langmuir probes for current estimation.

Main Results:

  • Achieved overdense plasma bulk density.

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  • Extracted electron currents exceeding 4 A.
  • Experimental currents closely matched Langmuir probe estimations.

    • Conclusions:

    • ECR plasma is a viable antenna-free electron source.
    • The device demonstrates high extraction current potential.
    • Further analysis of facility effects and trace ionization is warranted.