Abstract
A model is suggested that shows that in a plasma with a group of fast (non-Maxwellian) electrons, a nonmonotonic distribution of the potential can be formed inside the ion sheath with the potential maximum larger than the biased electrode potential. It was shown that the excess of the maximum potential above the biased electrode potential value depends on the ratio between the density of non-Maxwellian electrons and the density of the plasma bulk electrons. The results obtained in experiments with a hollow anode plasma source, which is characterized by the existence of a fast electron group, qualitatively agree with the model predictions.
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