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