title: Fully self-consistent ion-drag-force calculations for dust in collisional plasmas with an external electric field.
abstract: The ion drag force on a spherical dust particle immersed in a flowing plasma with an external electric field is self-consistently calculated using the particle-in-cell code SCEPTIC in the entire range of charge-exchange collisionality. Our results, not based on questionable approximations, extend prior analytic calculations valid only in a few limiting regimes. Particular attention is given to the force direction, shown never to be directed opposite to the flow except in the continuum limit, where other forces are of a much stronger magnitude.
authors.affiliation: Plasma Science and Fusion Center and Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Leonardo
authors.initials: L
authors.lastname: Patacchini
authors.forename: Ian H
authors.initials: IH
authors.lastname: Hutchinson