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Title: Dynamics of magnetic islands in large Δ{sup ′} regimes

Saturation of magnetic islands at large values of the tearing mode stability parameter Δ{sup ′} is investigated numerically. In such regimes, the island dynamics exhibit a number of transient features such as coalescence instability, X-point collapse, and plasmoid generation. It is shown that while conditions for these transient instabilities to appear depend on the viscosity and resistivity, the final width of the saturated island is independent of such phenomena, as well as viscosity and resistivity values. It is found that the saturated island width is strongly influenced by global properties of the current profile and related to the equilibrium reconnected flux across the magnetic island.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. CNRS, Aix-Marseille Université, PIIM UMR 7345, 13397 Marseille (France)
  2. Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2 (Canada)
  3. CEA, IRFM, F-13108 Saint Paul Lez Durance (France)
Publication Date:
OSTI Identifier:
22252021
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COALESCENCE; EQUILIBRIUM; MAGNETIC ISLANDS; SATURATION; STABILITY; TEARING INSTABILITY; VISCOSITY