Bulletin of the American Physical Society
49th Annual Meeting of the Division of Plasma Physics
Volume 52, Number 11
Monday–Friday, November 12–16, 2007; Orlando, Florida
Session JO7: Dusty and Complex Plasmas
2:00 PM–5:00 PM,
Tuesday, November 13, 2007
Rosen Centre Hotel Room: Salon 7/8
Chair: Ed Thomas, Auburn University
Abstract ID: BAPS.2007.DPP.JO7.5
Abstract: JO7.00005 : Heat transport in a two-dimensional complex (dusty) plasma at melting conditions*
2:48 PM–3:00 PM
Preview Abstract Abstract
(Max-Planck-Institute for Extraterrestrial Physics)
(Dept. of Physics \& Astronomy, Univ. of Iowa)
(Christian-Albrechts University, Kiel, Germany)
The heat transport in a two-dimensional complex (dusty) plasma undergoing a phase transition was studied experimentally. A single layer of highly charged polymer microspheres was suspended in a plasma sheath. In the absence of manipulation, the suspension forms a 2D triangular lattice. To melt this lattice and form a liquid, we used a laser-heating method. Two focused laser beams were moved rapidly around in the monolayer. The kinetic temperature of the particles increased with the laser power applied, and above a threshold a melting transition occurred. We used video microscopy for direct imaging and particle tracking. The spatial profiles of the particle kinetic temperature were calculated. Using the heat transport equation with an additional term to account for the energy dissipation due to the gas drag, we analyzed the temperature profiles to find a thermal conductivity, which did not depend on temperature.
*Work in Iowa supported by DOE and NASA.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.DPP.JO7.5
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