MIDIT OFD CATS Modelling, Nonlinear Dynamics Optics and Fluid Dynamics Chaos and Turbulence Studies and Irreversible Thermodynamics Risø National Laboratory Niels Bohr Institute and Technical University of Denmark Building 128 Department of Chemistry Building 321 P.O. Box 49 University of Copenhagen DK-2800 Lyngby DK-4000 Roskilde DK-2100 Copenhagen Ø Denmark Denmark Denmark
By Nikhil Chakrabarti,
Saha Institute of Nuclear Physics,
1/AF, Bidhannagar,
Calcutta - 64, India
Wednesday, October 31, 2001, 10.00 h
at OFD Meeting Room, Building 130, Risø National Laboratory
Abstract: Plasmas are initially unstable and then become turbulent and chaotic. This phenomena has traditionally been investigated by linearizing relevant equations and testing for unstable eigenvalues of the linearized problem, but the results of such investigations agree in many cases poorly with experiment. Nevertheless, linear effects play an important role in plasma instabilities. A reconciliation of these findings with traditional analysis is presented based on three novel techniques of treating 1D, 2D and 3D vortex-flow in a density gradient driven drift wave model. The relevance of intermittent transport will be discussed.