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Title: Non-linear magnetohydrodynamic simulations of density evolution in Tore Supra sawtoothing plasmas

Abstract

The plasma density evolution in sawtooth regime on the Tore Supra tokamak is analyzed. The density is measured using fast-sweeping X-mode reflectometry which allows tomographic reconstructions. There is evidence that density is governed by the perpendicular electric flows, while temperature evolution is dominated by parallel diffusion. Postcursor oscillations sometimes lead to the formation of a density plateau, which is explained in terms of convection cells associated with the kink mode. A crescent-shaped density structure located inside q = 1 is often visible just after the crash and indicates that some part of the density withstands the crash. 3D full MHD nonlinear simulations with the code XTOR-2F recover this structure and show that it arises from the perpendicular flows emerging from the reconnection layer. The proportion of density reinjected inside the q = 1 surface is determined, and the implications in terms of helium ash transport are discussed.

Authors:
; ; ; ;  [1]; ;  [2];  [3];  [4]
  1. CEA, IRFM, F-13108 Saint-Paul-Lez-Durance (France)
  2. Centre de Physique Theorique, Ecole Polytechnique, CNRS, F-91128 Palaiseau Cedex (France)
  3. Aix-Marseille University, IIFS-PIIM, UMR 7345, F-13397 Marseille (France)
  4. (Brazil)
Publication Date:
OSTI Identifier:
22068886
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 11; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONVECTION; DENSITY; DIFFUSION; HELIUM ASH; KINK INSTABILITY; MAGNETIC RECONNECTION; MAGNETOHYDRODYNAMICS; NONLINEAR PROBLEMS; PLASMA; PLASMA DENSITY; PLASMA SIMULATION; SAWTOOTH OSCILLATIONS; TORE SUPRA TOKAMAK

Citation Formats

Nicolas, T., Sabot, R., Garbet, X., Decker, J., Merle, A., Luetjens, H., Luciani, J.-F., Guimaraes-Filho, Z., and Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo. Non-linear magnetohydrodynamic simulations of density evolution in Tore Supra sawtoothing plasmas. United States: N. p., 2012. Web. doi:10.1063/1.4766893.
Nicolas, T., Sabot, R., Garbet, X., Decker, J., Merle, A., Luetjens, H., Luciani, J.-F., Guimaraes-Filho, Z., & Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo. Non-linear magnetohydrodynamic simulations of density evolution in Tore Supra sawtoothing plasmas. United States. doi:10.1063/1.4766893.
Nicolas, T., Sabot, R., Garbet, X., Decker, J., Merle, A., Luetjens, H., Luciani, J.-F., Guimaraes-Filho, Z., and Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo. Thu . "Non-linear magnetohydrodynamic simulations of density evolution in Tore Supra sawtoothing plasmas". United States. doi:10.1063/1.4766893.
@article{osti_22068886,
title = {Non-linear magnetohydrodynamic simulations of density evolution in Tore Supra sawtoothing plasmas},
author = {Nicolas, T. and Sabot, R. and Garbet, X. and Decker, J. and Merle, A. and Luetjens, H. and Luciani, J.-F. and Guimaraes-Filho, Z. and Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo},
abstractNote = {The plasma density evolution in sawtooth regime on the Tore Supra tokamak is analyzed. The density is measured using fast-sweeping X-mode reflectometry which allows tomographic reconstructions. There is evidence that density is governed by the perpendicular electric flows, while temperature evolution is dominated by parallel diffusion. Postcursor oscillations sometimes lead to the formation of a density plateau, which is explained in terms of convection cells associated with the kink mode. A crescent-shaped density structure located inside q = 1 is often visible just after the crash and indicates that some part of the density withstands the crash. 3D full MHD nonlinear simulations with the code XTOR-2F recover this structure and show that it arises from the perpendicular flows emerging from the reconnection layer. The proportion of density reinjected inside the q = 1 surface is determined, and the implications in terms of helium ash transport are discussed.},
doi = {10.1063/1.4766893},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 11,
volume = 19,
place = {United States},
year = {2012},
month = {11}
}