Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 23, Pages 5278-5281Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.5278
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Collisions have traditionally been neglected in calculating the shielding around a small spherical collector in a plasma, and the plasma flow to the collector. We show analytically that, in dusty plasmas under typical discharge conditions, ion charge-exchange collisions lead to the buildup of negative-energy trapped ions which dominate the shielding cloud in the nonlinear region near a dust grain and substantially increase the ion current to the grain, even when the mean-free path is much greater than the Debye length.
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