APPLIED PHYSICS

THE SCIENTIFIC AND TECHNICAL JOURNAL


No. 6 Founded in 1994 Moscow 2008


Research of transition in a condition of plasma keeping with a marginal transport barrier at electron-cyclotron heating in the L-2M stellarator

G. S. Voronov, D. K. Akulina, G. M. Batanov, M. S. Berezhetsky, D. G. Vasilkov, I. J. Vafin, E. V. Voronova, G. A. Gladkov, S. E. Grebenchikov, I. A. Grishin, L. V. Kolik, N. F. Larionov, A. A. Letunov, V. P. Logvinenko, A. I. Meshcheryakov, J. I. Nechaev, A. E. Petrov, K. A. Sarksyan, N. N. Skvortsova, O. I. Fedyanin, N. K. Kharchev, J. V. Kholnov, S. V. Shchepetov
A. M. Prokhorov General Physics Institute of the Russian Academy of Science, Moscow, Russia

   The mode of keeping the plasma with a marginal transport barrier (MTB) has been found out after boroning the L-2M stellarator vacuum chamber. Two modes of plasma keeping are realized depending on a specific power of heating: the MTB mode to be obviously expressed, in which a temperature jump and sharp increase of a Te gradient are observed on an edge of plasma, and the mode without MTB, in which Te smoothly falls down to the edge of plasma. The value of the threshold powder for transition in the MTB mode is Pth = 8·10-18ne kW. Value of Pth and a kind of dependence of Pth/ne coincides with scaling for tokamaks to 1.5. It is observed broadening a structure of Te(r) in the central part of plasma at the MTB mode.

PACS: 52.55.Hc

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