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Abstract

A new mechanism for intermittent relaxations of transport barriers is found by using three dimensional fluid turbulence simulations. This mechanism is generic since it only requires a stationary E x B shear flow. It is found here that if the flow shear increases faster than linearly with heating power, the relaxation frequency decreases with power. An analytical study reveals that this nonlinear dynamics is governed by a time delay for effective velocity shear stabilization.

Additional information

Authors: BEYER P, Equipe Dynamique des Systèmes Complexes, LPIIM, CNRS-Université de Provence, Marseille (FR);BENKADDA S, Equipe Dynamique des Systèmes Complexes, LPIIM, CNRS-Université de Provence, Marseille (FR);FUHR-CHAUDIER G, Equipe Dynamique des Systèmes Complexes, LPIIM, CNRS-Université de Provence, Marseille (FR);GARBET X, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);GHENDRIH PH, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);SARAZIN Y, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Physical Review Letters, Vol. PRL 94 (2005), p. 105001-1 à 4
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://prl.aps.org/
Record Number: 200518099 / Last updated on: 2005-04-25
Category: PUBLICATION
Original language: en
Available languages: en