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Regularization of superdrift magnetic islands for finite electron temperature

Published online by Cambridge University Press:  17 June 2002

A. B. MIKHAILOVSKII ,
S. V. KONOVALOV ,
G. I. SURAMLISHVILI  and
V. S. TSYPIN
A. B. MIKHAILOVSKII
Affiliation:
Institute of Nuclear Fusion, Russian Research Centre ‘Kurchatov Institute’, Kurchatov Square, 1, Moscow, 123182, Russia
S. V. KONOVALOV
Affiliation:
Institute of Nuclear Fusion, Russian Research Centre ‘Kurchatov Institute’, Kurchatov Square, 1, Moscow, 123182, Russia
G. I. SURAMLISHVILI
Affiliation:
Andronikashvili Institute of Physics, Georgian Academy of Sciences, Tamarashvili Street 6, Tbilisi, 380077, Georgia
V. S. TSYPIN
Affiliation:
Institute of Physics, University of São Palo, Rua do Matão, Travessa R, 187, 05508-900 São Paulo, Brasil
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Abstract

The regularization of magnetic islands is studied for the case when the electron temperature is larger than the ion temperature. The slab approximation is used. Drift effects are neglected, i.e., the case of superdrift magnetic islands, SDMIs, is analyzed. Then the regularization problem reduces to, first, a spreading of the step-functional velocity profile and the conventional delta-functional polarization current profile in the region near the island separatrix; second, finding the dispersion terms of the polarization current in this region; and, third, calculating the total polarization current contribution to the generalized Rutherford equation for the island width. It is shown that this problem can be solved if one allows for the effects of the electron pressure gradient in the parallel Ohm's law. The polarization current contribution in the case of islands regularized due to these effects proves to be the same as that in the case of nonregularized islands.

Type
Research Article
Information
Journal of Plasma Physics , Volume 67 , Issue 2-3 , April 2002 , pp. 99 - 114
Copyright
2002 Cambridge University Press

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