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.
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February 2014
Letter|
February 11 2014
Response of microscale turbulence and transport to the evolution of resistive magnetohydrodynamic magnetic island
Jiquan Li;
Jiquan Li
a)
1
Graduate School of Energy Science, Kyoto University
, Uji, Kyoto 611-0011, Japan
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Y. Kishimoto;
Y. Kishimoto
1
Graduate School of Energy Science, Kyoto University
, Uji, Kyoto 611-0011, Japan
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Z. X. Wang
Z. X. Wang
2
School of Physics and Optoelectronic Technology, Dalian University of Technology
, Dalian 116024, China
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a)
Electronic mail: [email protected]
Phys. Plasmas 21, 020703 (2014)
Article history
Received:
December 01 2013
Accepted:
January 30 2014
Citation
Jiquan Li, Y. Kishimoto, Z. X. Wang; Response of microscale turbulence and transport to the evolution of resistive magnetohydrodynamic magnetic island. Phys. Plasmas 1 February 2014; 21 (2): 020703. https://doi.org/10.1063/1.4865378
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