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Title: Global magnetohydrodynamic instabilities in the L-2M stellarator

Analysis of global magnetohydrodynamic (MHD) instabilities in the L-2M stellarator (Prokhorov General Physics Institute, Russian Academy of Sciences) is presented. The properties of free-boundary equilibria states are outlined, the stability conditions for small-scale modes are briefly discussed, and the number of trapped particles is estimated. All the magnetic configurations under study are stable against ballooning modes. It is shown that global ideal internal MHD modes can be found reliably only in Mercier unstable plasmas. In plasma that is stable with respect to the Mercier criterion, global unstable modes that are localized in the vicinity of the free plasma boundary and are not associated with any rational magnetic surface inside the plasma (the so-called peeling modes) can be found. The radial structure of all perturbations under study is almost entirely determined by the poloidal coupling of harmonics. The results of calculations are compared with the available experimental data.
Authors:
 [1] ;  [2] ; ;  [3]
  1. National Research Centre Kurchatov Institute (Russian Federation)
  2. Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)
  3. Max-Planck-Institut für Plasmaphysik (Germany)
Publication Date:
OSTI Identifier:
22472013
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 41; Journal Issue: 12; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BALLOONING INSTABILITY; COUPLING; DISTURBANCES; EQUILIBRIUM; HARMONICS; L-2 STELLARATOR; MAGNETIC SURFACES; MAGNETOHYDRODYNAMICS; MERCIER CRITERION; PLASMA; TRAPPING