Abstract
Results from T-10 experiments in regimes with nonmonotonic plasma current profiles are presented. The possibility of controlling the current profile j(r) by electron-cyclotron current drive is demonstrated experimentally. Nonmonotonic q profiles with the reversed shear are obtained in which the q min value varies in a wide range, q min=1–2.3. It is shown that the current profiles with q min∼2 (in this case, there are two resonant magnetic surfaces q=2 in the plasma) can cause the onset of MHD instabilities. The possibility of the formation of an internal transport barrier in reversed-shear discharges in the T-10 tokamak is analyzed. In T-10, electron transport is governed by short-wavelength electron turbulence. As a result, there is no clear evidence of the formation of an inner transport barrier in these experiments.
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Translated from Fizika Plazmy, Vol. 26, No. 3, 2000, pp. 195–208.
Original Russian Text Copyright © 2000 by Alikaev, Borshchegovski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \), Dremin, Esipchuk, Kalupin, Kirneva, A. Kislov, D. Kislov, Martynov, Myalton, Notkin, Poznyak, Pavlov, Ro\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \), Stepanenko, Sushkov, Trukhin, Chistyakov.
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Alikaev, V.V., Borshchegovskii, A.A., Dremin, M.M. et al. Reversed-shear experiments in the T-10 tokamak. Plasma Phys. Rep. 26, 177–190 (2000). https://doi.org/10.1134/1.952849
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DOI: https://doi.org/10.1134/1.952849