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Title: Viscous relaxation of drift-Alfven waves in tokamaks and its application for triggering improved confinement regimes

Abstract

Viscous damping of the drift-Alfven modes in tokamaks and its application for triggering improved confinement regimes are considered. It is shown that these waves are effectively damped by the neoclassical viscosity with the upper limit for their frequency {omega} equal to the collision frequency of slow ions {nu}{sub i}/{epsilon}, where {epsilon} is the inverse aspect ratio. Quasistationary plasma poloidal and toroidal velocities and current drive produced by damping of these waves are estimated. Evaluations of the viscosity effects on the Alfven waves which were induced by the dynamic ergodic divertor in the Tokamak Experiment for Technology Oriented Research tokamak [K. H. Finken et al., Phys. Rev. Lett. 94, 015003 (2005)] are made.

Authors:
; ;  [1];  [2]
  1. Institute of Physics, University of Sao Paulo, Cidade Universitaria, 05508-900, Sao Paulo (Brazil)
  2. (Brazil)
Publication Date:
OSTI Identifier:
20960132
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 1; Other Information: DOI: 10.1063/1.2434792; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALFVEN WAVES; ASPECT RATIO; COLLISIONS; CURRENTS; DAMPING; DIVERTORS; IONS; NEOCLASSICAL TRANSPORT THEORY; PLASMA; PLASMA CONFINEMENT; PLASMA DRIFT; RELAXATION; TOKAMAK DEVICES; VISCOSITY

Citation Formats

Tsypin, V. S., Elfimov, A. G., Galvao, R. M. O., and Institute of Physics, University of Sao Paulo, Cidade Universitaria, 05508-900, Sao Paulo, Brazil and Centro Brasileiro de Pesquisas em Fisica, Rua Xavier Sigaud 150, Rio de Janeiro, BR-22290180. Viscous relaxation of drift-Alfven waves in tokamaks and its application for triggering improved confinement regimes. United States: N. p., 2007. Web. doi:10.1063/1.2434792.
Tsypin, V. S., Elfimov, A. G., Galvao, R. M. O., & Institute of Physics, University of Sao Paulo, Cidade Universitaria, 05508-900, Sao Paulo, Brazil and Centro Brasileiro de Pesquisas em Fisica, Rua Xavier Sigaud 150, Rio de Janeiro, BR-22290180. Viscous relaxation of drift-Alfven waves in tokamaks and its application for triggering improved confinement regimes. United States. doi:10.1063/1.2434792.
Tsypin, V. S., Elfimov, A. G., Galvao, R. M. O., and Institute of Physics, University of Sao Paulo, Cidade Universitaria, 05508-900, Sao Paulo, Brazil and Centro Brasileiro de Pesquisas em Fisica, Rua Xavier Sigaud 150, Rio de Janeiro, BR-22290180. Mon . "Viscous relaxation of drift-Alfven waves in tokamaks and its application for triggering improved confinement regimes". United States. doi:10.1063/1.2434792.
@article{osti_20960132,
title = {Viscous relaxation of drift-Alfven waves in tokamaks and its application for triggering improved confinement regimes},
author = {Tsypin, V. S. and Elfimov, A. G. and Galvao, R. M. O. and Institute of Physics, University of Sao Paulo, Cidade Universitaria, 05508-900, Sao Paulo, Brazil and Centro Brasileiro de Pesquisas em Fisica, Rua Xavier Sigaud 150, Rio de Janeiro, BR-22290180},
abstractNote = {Viscous damping of the drift-Alfven modes in tokamaks and its application for triggering improved confinement regimes are considered. It is shown that these waves are effectively damped by the neoclassical viscosity with the upper limit for their frequency {omega} equal to the collision frequency of slow ions {nu}{sub i}/{epsilon}, where {epsilon} is the inverse aspect ratio. Quasistationary plasma poloidal and toroidal velocities and current drive produced by damping of these waves are estimated. Evaluations of the viscosity effects on the Alfven waves which were induced by the dynamic ergodic divertor in the Tokamak Experiment for Technology Oriented Research tokamak [K. H. Finken et al., Phys. Rev. Lett. 94, 015003 (2005)] are made.},
doi = {10.1063/1.2434792},
journal = {Physics of Plasmas},
number = 1,
volume = 14,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}