Physics
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..446...41m&link_type=abstract
Seventh workshop on the physics of dusty plasmas. AIP Conference Proceedings, Volume 446, pp. 41-48 (1998).
Physics
1
Impurities In Plasmas, Particle Orbits
Scientific paper
Electrostatic traps have been used to confine negatively charged dust particles to orbits about a central electrode in vacuum. The particles are glass microballoons about 50 microns in diameter charged to a potential of about -20 volts. The central electrode, at a potential of about +8 kV, is either a 6-mm diameter rod or a 12-mm diameter sphere. Particle orbits decay gradually until the particles strike the central electrode. Experiments with gas pressures from 10-4 to 10-7 Torr indicate that the confinement is limited by molecular drag. The longest confinement times are about 6 hours. At lower pressures, there may be dissipation caused by the motion of image charges in the walls of the traps. This is being investigated by varying the placement of the walls and by resistively loading the walls. Resistive dissipation may account for the orbits becoming circular more rapidly than predicted by molecular drag alone. As many as seven particles have been trapped simultaneously and collisions and resonances between particles have been observed.
Mahr Chance
Walch Bob
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