Small-scale dynamo action in multi-scale magnetohydrodynamic and micro-turbulence

被引：14

作者：

Li, Jiquan ^{[1
]}

Kishimoto, Y. ^{[1
]}

机构：

[1] Kyoto Univ, Grad Sch Energy Sci, Kyoto 6110011, Japan

来源：

PHYSICS OF PLASMAS | 2012年 / 19卷 / 03期

关键词：

Discussions with Z. X. Wang are acknowledged. We are grateful to the referee for useful comments. This work is supported by the [!text type='JS']JS[!/text]PS-CAS (Japan–China) Core University Program on Plasma and Nuclear Fusion and by the [!text type='JS']JS[!/text]PS Asian CORE program on Plasma and Nuclear Fusion;

D O I：

10.1063/1.3698111

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Nonlinear interplay between resistive magnetohydrodynamic (MHD) magnetic island and drift wave micro-turbulence is investigated using direct Landau-fluid simulations. A twisting oscillation of magnetic island associated with the driving force of micro-turbulence is observed, which is referred to as magnetic island seesaw. In the initiating phase of the seesaw oscillation, small-scale current and magnetic field fluctuations increase dramatically while the magnetic induction grows exponentially at small-scales corresponding to the spatial scale of micro-turbulence, showing a small-scale dynamo action. A minimal model consisting of reduced MHD turbulence and a micro-instability is proposed to elucidate the underlying mechanism. It is identified that the island seesaw is driven by a net oscillatory electromagnetic torque, which results from small-scale dynamo-generated current and magnetic field. The dynamo mechanism may offer an important energy exchange channel between MHD and micro-turbulence in magnetic fusion plasmas. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3698111]

引用

页数：4

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