Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2014-02-01

Journal: PHYSICS OF PLASMAS

Included Journals: Scopus、EI、SCIE

Volume: 21

Issue: 2

ISSN: 1070-664X

Abstract: 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. (C) 2014 AIP Publishing LLC.