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Abstract

Radial propagation of turbulence could explain a non local dependence of the fluctuation spectra and transport coefficients on plasma parameters. It is shown in this work that such a propagation could be due to toroidal coupling or non-linear mode coupling. In the first case, the propagation is characterised by a group velocity whereas both ballistic and diffusive behaviours are possible when non-linearities are involved. A numerical simulation shows that a strong perturbation radially diffuses in non-linear regime.

Additional information

Authors: GARBET X, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);LAURENT L, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);ROUBIN J P, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);SAMAIN A, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: 14th International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Würzburg (DE), September 30 - October 7, 1992
Availability: Available from (1) as Paper EN 37028 ORA
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