Experimental Dust Levitation in a Plasma Sheath near a Surface

Details Experimental Dust Levitation in a Plasma Sheath near a Surface Experimental Dust Levitation in a Plasma Sheath near a Surface

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..649..235s&link_type=abstract

DUSTY PLASMAS IN THE NEW MILLENNIUM: Third Conference on the Physics of Dusty Plasmas. AIP Conference Proceedings, Volume 649,

Physics

Dusty Or Complex Plasmas, Plasma Crystals, Impurities In Plasmas, Plasma Sheaths

Scientific paper

We report the results of experiments on the levitation of dust particles in an argon plasma sheath above a flat, conducting surface. Types of particles tested include hollow glass microballoons, polystyrene DVB (divinylbenzene) microbeads, and JSC-1, a lunar regolith simulant. Plasma characteristics are determined using a Langmuir probe, while the sheath potential profiles are measured by an emissive probe. Dust particles levitating above the surface of the plate are illuminated by an Ar laser and observed by a video camera. Our experimental results suggest the following: (1) various types and sizes of particles can levitate in a plasma sheath above a surface; (2) particle levitation height and corresponding charge are comparable to the values calculated from orbital motion limited (OML) theory; (3) exposure to a UV source slightly alters the particle levitation height; (4) a mechanism to inject particles into the sheath is not necessary given a large enough surface bias; (5) complex particle dynamics occur in the plasma, and horizontal transport across the surface has been measured.

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