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INCOHERENT SCATTERING OF MICROWAVES FROM ENHANCED DENSITY FLUCTUATIONS IN A DC DISCHARGE,
ILLINOIS UNIV URBANA COORDINATED SCIENCE LAB
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Radiation of 9375 MHz is incident on a cylindrical neon discharge enclosed in a 1 inch square waveguide and incoherent scattering in the upper sideband is investigated. Scattering is observed in the backward and forward directions from the naturally enhanced density fluctuations in two electron plasma modes for gas pressures between 3.8X0.001 Toor and 8.0X0.001 Toor. The measured electron mode frequencies are in general agreement with other experiments. The enhancement, varying between 30 and 8000 times the estimated thermal value is correlated over most of the pressure range to excess super-thermal electrons present in the discharge, as measured by a Langmuir probe. Author
APPROVED FOR PUBLIC RELEASE