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Title: Response of microscale turbulence and transport to the evolution of resistive magnetohydrodynamic magnetic island

Nonlinear evolution of microscale turbulence interacting with a naturally growing MHD magnetic island is simulated based on a Landau-fluid model. Here, we report on a new short wavelength magnetic-island-induced ion temperature gradient (ITG) instability triggered by a critical threshold of magnetic island width in multiscale turbulence, which is referred to as sw-MITG mode. The sw-MITG mode is characterized by a substantially low stability threshold and a global structure propagating along the ion diamagnetic drift direction. Its generation results from the response of microscale fluctuations to turbulent cross-field heat transport associated with increasing boundary layer width about the island separatrix. An intermittency of heat transport is caused by the sw-MITG mode interacting with dynamical magnetic island and microturbulence.
Authors:
;  [1] ;  [2]
  1. Graduate School of Energy Science, Kyoto University, Uji, Kyoto 611-0011 (Japan)
  2. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)
Publication Date:
OSTI Identifier:
22252079
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; BOUNDARY LAYERS; EVOLUTION; FLUCTUATIONS; HEAT TRANSFER; ION TEMPERATURE; MAGNETIC ISLANDS; MAGNETOHYDRODYNAMICS; NONLINEAR PROBLEMS; PLASMA INSTABILITY; SIMULATION; TEMPERATURE GRADIENTS; TURBULENCE