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Title: Is it possible that MHD instability triggers a transition into the improved confinement regime of toroidal plasmas?

Abstract

Analyzing the experimental data from L-2M stellarator and performing appropriate theoretical analysis, the authors affirmatively answer the question raised in the title of the article. The external peeling mode is proposed as the instability triggering the transition. Peeling mode stability in magnetic-hill Mercierstable plasmas is analyzed analytically. It is shown that correctly taking into account vacuum region forbids internal peeling modes, while the external peeling mode has a threshold with respect to the plasma pressure gradient. Calculations and experimental data are in reasonable agreement.

Authors:
;  [1]
  1. Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22760319
Resource Type:
Journal Article
Journal Name:
Plasma Physics Reports
Additional Journal Information:
Journal Volume: 43; Journal Issue: 7; Other Information: Copyright (c) 2017 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-780X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONFINEMENT; INSTABILITY; MAGNETOHYDRODYNAMICS; PRESSURE GRADIENTS; STABILITY; STELLARATORS

Citation Formats

Shchepetov, S. V., E-mail: shch@fpl.gpi.ru, and Vasilkov, D. G. Is it possible that MHD instability triggers a transition into the improved confinement regime of toroidal plasmas?. United States: N. p., 2017. Web. doi:10.1134/S1063780X1707011X.
Shchepetov, S. V., E-mail: shch@fpl.gpi.ru, & Vasilkov, D. G. Is it possible that MHD instability triggers a transition into the improved confinement regime of toroidal plasmas?. United States. doi:10.1134/S1063780X1707011X.
Shchepetov, S. V., E-mail: shch@fpl.gpi.ru, and Vasilkov, D. G. Sat . "Is it possible that MHD instability triggers a transition into the improved confinement regime of toroidal plasmas?". United States. doi:10.1134/S1063780X1707011X.
@article{osti_22760319,
title = {Is it possible that MHD instability triggers a transition into the improved confinement regime of toroidal plasmas?},
author = {Shchepetov, S. V., E-mail: shch@fpl.gpi.ru and Vasilkov, D. G.},
abstractNote = {Analyzing the experimental data from L-2M stellarator and performing appropriate theoretical analysis, the authors affirmatively answer the question raised in the title of the article. The external peeling mode is proposed as the instability triggering the transition. Peeling mode stability in magnetic-hill Mercierstable plasmas is analyzed analytically. It is shown that correctly taking into account vacuum region forbids internal peeling modes, while the external peeling mode has a threshold with respect to the plasma pressure gradient. Calculations and experimental data are in reasonable agreement.},
doi = {10.1134/S1063780X1707011X},
journal = {Plasma Physics Reports},
issn = {1063-780X},
number = 7,
volume = 43,
place = {United States},
year = {2017},
month = {7}
}