Response of microscale turbulence and transport to the evolution of resistive magnetohydrodynamic magnetic island
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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.
収録刊行物
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- Physics of Plasmas
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Physics of Plasmas 21 (2), 2014-02
AIP Publishing
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詳細情報
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- CRID
- 1050282810765509504
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- NII論文ID
- 120005399111
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- NII書誌ID
- AA10987555
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- ISSN
- 1070664X
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- HANDLE
- 2433/185158
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- IRDB
- CiNii Articles