Title :
2-D plasma dust crystal compression in a parabolic well
Author :
Hebner, G.A. ; Riley, M.E. ; Johnson, D.S. ; Ho, Pauline ; Buss, R.J.
Author_Institution :
Sandia Nat. Labs., Albuquerque, NM, USA
fDate :
2/1/2002 12:00:00 AM
Abstract :
A spherically curved (locally parabolic) electrode with a conformal plasma sheath can be used to directly test two-dimensional (2-D) plasma crystal particle-particle interaction models and to derive the screening length and the charge on the particles. By using such a well, the lateral interaction potential was isolated and accessible. Good agreement was obtained between measured and calculated single particle trajectories using measured gas densities and temperatures to determine the neutral gas drag. Plasma crystal compression in the parabolic potential was demonstrated to be in good agreement with that predicted by an equation of state for the 2-D dust layer incorporating Debye shielding of the charges
Keywords :
dusty plasmas; plasma density; plasma diagnostics; plasma sheaths; plasma temperature; 2-D dust layer; 2-D plasma dust crystal compression; Debye shielding; conformal plasma sheath; equation of state; gas densities; gas temperatures; lateral interaction potential; locally parabolic electrode; neutral gas drag; parabolic potential; parabolic well; particle charge; plasma crystal compression; screening length; single particle trajectories; spherically curved electrode; two-dimensional plasma crystal particle-particle interaction models; Density measurement; Dusty plasma; Electrodes; Particle measurements; Plasma density; Plasma displays; Plasma measurements; Plasma sheaths; Plasma temperature; Testing;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2002.1003940
