Speaker
Mr
Timothée Nicolas
(France)
Description
In this contribution, the plasma density evolution in sawtooth regime on the Tore Supra tokamak is studied. The density is measured using a novel fast-sweeping X-mode reflectometry technique, which is fast enough to allow tomographic reconstructions. There is strong evidence that temperature and density are governed by different mechanisms. Postcursor oscillations sometimes lead to the formation of a density plateau, which is explained in terms of the convection cells associated with the kink mode. A crescent-shaped density structure located inside the q=1 surface is often visible just after the crash and indicates that a significant part of the density withstands the crash and is reinjected inside the surface. 3D full bifluid and nonlinear MHD simulations with the XTOR-2F code recover this structure and show that it arises from the perpendicular flows emerging from the reconnection layer.
Country or International Organization of Primary Author
France
Primary author
Mr
Xavier Garbet
(CEA, IRFM, F-13108 St-Paul-Lez-Durance, France)
Co-authors
Mr
Antoine Merle
(CEA, IRFM, F-13108 St-Paul-Lez-Durance, France)
Mr
Federico Halpern
(Centre de Recherches en Physique des Plasmas (CRPP), Ecole Polytechnique Fédérale de Lausanne (EPFL), Association Euratom–Suisse, CH-1015 Lausanne, Switzerland)
Mr
Hinrich Lutjens
(Centre de Physique Théorique, Ecole Polytechnique, CNRS, F-91128 Palaiseau Cedex, France)
Mr
Jean-François Luciani
(Centre de Physique Théorique, Ecole Polytechnique, CNRS, F-91128 Palaiseau Cedex, France)
Mr
Joan Decker
(CEA, IRFM, F-13108 St-Paul-Lez-Durance, France)
Mr
Roland Sabot
(CEA, IRFM, F-13108 St-Paul-Lez-Durance, France)
Mr
Rémy Guirlet
(CEA, IRFM, F-13108 St-Paul-Lez-Durance, France)
Mr
Timothée Nicolas
(France)
