Graduate School in Nonlinear Science

Sponsored by the Danish Research Academy

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 Silvia Valeria Annibaldi
School of Cosmic Physics,

Tuesday January 18, 2000, 13.00 h
at OFD-Meeting Room, Bld. 130,
Risø National Laboratory, Roskilde

Abstract: It is important to understand the basic features of particle transport in a strongly turbulent plasma. For magnetically confined plasmas, a relatively simple and flexible two dimensional model for the turbulent electrostatic field, in the plane perpendicular to the magnetic field, is provided by the Hasegawa-Mima equation, which also has many wider physical applications. We have studied the poloidal transport of test particles moving in such field. As a result of the interplay of the nonlinear and linear term in the Hasegawa-Mima equation (the strength of the latter being determined by the background density gradient), `strange kinetics' emerge: the poloidal particle transport undergoes a qualitative transition from diffusive, through supradiffusive, to ballistic.