Abstract
MHD oscillations with m/n = 4/1 and 3/1 that arise at the periphery of the TUMAN-3M tokamak in the initial stage of a discharge are investigated. It is found that these oscillations lead to a significant modulation of the electron density n e , which is attributable to the accumulation of plasma within a magnetic island. Numerical simulations of the modulation structure made it possible to determine the radius of the resonant surface and the radial width of the island and to evaluate the characteristic density gradient in the island. The gradient was found to be ten times larger than that of the unperturbed profile of n e (r) near the resonant surface. This points to reduced plasma transport within the magnetic island.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
S. V. Mirnov and I. B. Semenov, At. Énerg. 30, 20 (1971).
J. A. Wesson, Nucl. Fusion 18, 87 (1978).
N. Sauthoff, S. von Goeler, and W. Stodiek, Nucl. Fusion 18, 1445 (1978).
P. C. de Vries, A. J. H. Donne, S. H. Heijnen, et al., Nucl. Fusion 37, 1641 (1997).
A. N. Arbuzov and M. P. Gryaznevich, Preprint No. 1431 (Ioffe Physicotechnical Institute, Leningrad, 1990).
F. Troyon, R. Gruber, H. Saurenmann, et al., Plasma Phys. Controlled Fusion 26, 209 (1984).
S. V. Lebedev, L. G. Askinazi, V. E. Golant, et al., Plasma Phys. Controlled Fusion 40, 741 (1998).
L. G. Askinazi, M. I. Vild’junas, V. E. Golant, et al., in Proceedings of the 28th EPS Conference on Fusion and Plasma Physics, Funchal, 2001; ECA 25A, 101 (2001).
Yu. N. Dnestrovskij, E. S. Lyadina, and P. V. Savrukhin, in Proceedings of the 20th Conference on Phenomena in Ionized Gases, Piza, 1991, p. 802.
M. Kikuchi, Nucl. Fusion 26, 101 (1986).
A. Weller, A. D. Cheetham, A. W. Edwards, et al., Phys. Rev. Lett. 59, 2303 (1987).
Author information
Authors and Affiliations
Additional information
__________
Translated from Fizika Plazmy, Vol. 31, No. 10, 2005, pp. 867–872.
Original Russian Text Copyright © 2005 by Kornev, Askinazi, Vil’dzhyunas, Golant, Zhubr, Krikunov, Lebedev, Rozhdestvenski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \), Tukachinski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \).
Rights and permissions
About this article
Cite this article
Kornev, V.A., Askinazi, L.G., Vil’dzhyunas, M.I. et al. Electron density modulation in magnetic islands in the TUMAN-3M tokamak. Plasma Phys. Rep. 31, 803–808 (2005). https://doi.org/10.1134/1.2101967
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1134/1.2101967