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.