Abstract
A hollow-cathode device has been shown to operate as a plasmareflector for electronic steering of radar beams using helium in the0.2-0.5 Torr pressure range. Compared to previous experiments, the use ofthis light gas significantly reduces the spurious sputtering effects on thecathode materials. A semi-quantitative physical model was developed todescribe the observed evolution of microwave beam transmissions through theplasma sheet as a function of frequency. This model stresses the importance ofelectron-ion recombination on the edge of the plasma sheet, due tosimultaneous low electron temperatures and high electron densities.
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