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Low frequency microturbulence is commonly believed to explain the anomalous particle and heat transport in tokamaks. Up to now, electrostatic turbulence driven by trapped electrons (DTEM) has been the prevailing model. This success relies on turbulence measurements which are in qualitative agreement with this model. However, this theory hardly explains some well reproducible characteristics of the transport. The aim of this paper is to show that mode localisation can result from non-linear mode coupling. To demonstrate this, the derivation of non-linear equations describing the drift turbulence is required. Previous results are reviewed and discussed. A simplified version of the Hamiltonian technique used in this study is presented, and the basic equations are given. Finally the numerical and analytical results are detailed, and compared with those of other research efforts in this field.

Additional information

Authors: GARBET X ET AL., CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);MORROS TOSAS J, Rhône-Poulenc, Aubervillier Research Centre (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1470 EN (1992) 21 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
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