Floating potential of large dust grains in a collisionless flowing plasma

Details Floating potential of large dust grains in a collisionless flowing plasma Floating potential of large dust grains in a collisionless flowing plasma

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012phrve..85c6403w&link_type=abstract

Physical Review E, vol. 85, Issue 3, id. 036403

Physics

Dusty Or Complex Plasmas, Plasma Crystals, Interplanetary Dust And Gas, Spacecraft Sheaths, Wakes, And Charging

Scientific paper

Dust immersed in plasma quickly charges to a potential where the ion and electron currents to its surface balance; this is the floating potential. In order to accurately determine dust behavior, the floating potential must be known. The charging of dust grains that are small with respect to electron Debye length (λD) may be adequately approximated using the orbital-motion-limited (OML) approach. A modified version of OML is presented for large dust grains in both stationary and flowing plasmas. This modified OML is compared with simulation and found to be in good agreement. The modified OML is applied to large grains charging under tokamak conditions and found to have an appreciable effect on the drag force.

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