Instability-Triggered Phase Transition to a Dusty Plasma Condensate

Details Instability-Triggered Phase Transition to a Dusty Plasma Condensate Instability-Triggered Phase Transition to a Dusty Plasma Condensate

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apro16003l&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Highly charged dust grains in plasma discharges reside at the sheath edge, where the ions stream toward the electrode at a speed of order of the ion sound speed. Experiments indicate that at pressures above a critical pressure Pcrit, the grains lose their initial kinetic energy and reach a strongly coupled crystalline state, but for pressures below Pcrit the grains acquire a large random kinetic energy and act like a fluid or gas. In the latter case, the kinetic temperature of the grains is typically hundreds to thousands of eV, far higher than the temperature of any other plasma component. We use simulation and analysis to show that the dust heating in the fluid phase is due to an ion-dust two-stream instability, which is stabilized at pressures above Pcrit by the combined effect of ion-molecule and grain-molecule collisions.

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