Electron Density Measurement by Microwave Scattering from Underdense Cylindrical Plasmas

DOI Web Site BIBCODE 参考文献8件
  • Shiobara Shinji
    Thermonuclear Fusion Laboratory, The Institute of Physical and Chemical Research

説明

From Midzuno’s scattering theory in the Born approximation, formulas are derived for the phase shift of coherent microwaves caused by cylindrical plasmas. Experiments are made on helium plasmas of 17 to 96 mm diameter at 34GC and on a 45 mm diameter plasma at 9GC with standard type micro-wave interferometers to examine the applicability of the formulas. Agreement between the values of phase shift predicted by theory and those obtained by experiment is remarkably good when judged from the calibration by Langmuir probe. By the use of the derived formulas, a new method of analysis is proposed for measuring the electron density of underdense cylindrical plasmas for which the phase shift analysis based on the plane slab approximation may not simply be applied. It is found by experiment that the effect of glass wall of the discharge tube on the phase shift is only to shift the point of balance of the interferometer bridge.

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