title: Effect of trapped ions on shielding of a charged spherical object in a plasma.
abstract: 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.
authors.affiliation: Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375-5346, USA. lampe@ppd.nrl.navy.mil
authors.forename: M
authors.initials: M
authors.lastname: Lampe
authors.forename: V
authors.initials: V
authors.lastname: Gavrishchaka
authors.forename: G
authors.initials: G
authors.lastname: Ganguli
authors.forename: G
authors.initials: G
authors.lastname: Joyce