Graduate School in Nonlinear Science

Sponsored by The Danish Research Agency

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.