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Comparison of probe and microwave measurements of electron density in plasmatic cylinder

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Abstract

The paper deals with a comparison of the measurement of the electron density of a plasmatic cylinder in a weak magnetic field (radius of cyclotron rotation of ionsr Hi is larger than radius of probea) parallel to the axis of the plasma by means of a cylindrical Langmuir probe and a microwave interferometer in the X band. A Langmuir probe is used to measure the electron density distribution across the cross-section of the plasmatic cylinder, i.e. in the plane perpendicular to the axis of the cylinder. The measured density distribution is used to determine the mean electron density over the cylinder cross-section. This mean electron density is compared with the density found with a microwave interferometer. In evaluating the measurements the concentration of the microwave energy through the antennas of the interferometer in the cross-section of the plasmatic cylinder is considered. The difference of the mean electron density found by the microwave method from the mean density found by the probe method was in the least favourable case 30%. In conclusion, the paper gives a comparison of the probe and microwave measurements of the plasma density in a stronger magnetic field, whenr Hi ≧a.

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Additional information

The authors thank J. Teichmann, C. Sc., R. Klíma, C.Sc. and other members of the department for discussions of the results, V. Kopecký for aid in the probe measurements and the director of the institute, Ing. J. Váňa, for his interest in the experiments.

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Musil, J., Ďatlov, J. & Žáček, F. Comparison of probe and microwave measurements of electron density in plasmatic cylinder. Czech J Phys 15, 391–398 (1965). https://doi.org/10.1007/BF01689249

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Keywords

  • Magnetic Field
  • Microwave
  • Density Distribution
  • Plasma Density
  • Measured Density