Particle Levitation in a Plasma Sheath Above a Surface

Details Particle Levitation in a Plasma Sheath Above a Surface Particle Levitation in a Plasma Sheath Above a Surface

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..dppfp1063s&link_type=abstract

American Physical Society, 43rd Annual Meeting of the APS Division of Plasma Physics October 29 - November 2, 2001 Long Beach, C

Physics

Plasma Physics

Scientific paper

Dust grains suspended above the lunar surface have been observed on multiple occasions. Virtually all small, airless bodies in the solar system are coated with a dusty regolith; therefore, charged dust particle levitation and transport may also occur in planetary ring systems, on Mars, Mercury, planetary satellites, asteroids, and comets. The interaction between charged dust particles and a photoelectron layer or plasma sheath above the surface is the most likely explanation for these dust dynamics. We report the results of experiments on the levitation, dynamics, and charging of dust particles in an Ar plasma sheath above a flat plate. Types of particles tested include hollow and solid glass microballoons (<45 microns in diameter), polystyrene DVB beads (5 microns and 10 microns in diameter), and JSC-1, a lunar regolith simulant (<25 microns in diameter). Plasma and sheath characteristics are determined through Langmuir probe and floating potential probe sweeps. An agitator under the surface provides a disturbance to inject dust into the sheath. Dust particles levitating above the surface of the plate are illuminated by an Ar laser and observed by a video camera.

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