The imposition of a hollow longitudinal beam of 2-kV electrons about a Q-machine potassium plasma column serves to deepen the radial potential well across that column. Transverse plasma flux is consequently decreased, while the peak ion density and end-plate collector current rise an order of magnitude. A calculation is made of the transverse flux of ions in the plasma column with energy sufficient to surmount the potential well.
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Cataldo et al. (1971) studied this question.
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