Viscous effects on plasmoid formation from nonlinear resistive tearing growth in a Harris sheet

被引：0

作者：

Nisar AHMAD ^{[1
]}

朱平 ^{[2
,3
]}

Ahmad ALI ^{[4
]}

曾市勇 ^{[5
]}

机构：

[1] CAS Key Laboratory of Geospace Environment and Department of Engineering and Applied Physics,University of Science and Technology of China

[2] International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Tech

[3] Department of Engineering Physics, University of Wisconsin-Madison

[4] Pakistan Tokamak Plasma Research Institute

[5] Department of Plasma Physics and Fusion Engineering, University of Science and Technology of China

来源：

Plasma Science and Technology | 2022年 / 24卷 / 01期

基金：

中央高校基本科研业务费专项资金资助; 中国国家自然科学基金;

关键词：

D O I：

暂无

中图分类号：

O53 [等离子体物理学];

学科分类号：

070204 ;

摘要：

In this work, the evolution of a highly unstable m=1 resistive tearing mode, leading to plasmoid formation in a Harris sheet, is studied in the framework of full MHD model using the Non-Ideal Magnetohydrodynamics with Rotation, Open Discussion simulation. Following the initial nonlinear growth of the primary m=1 island, the X-point develops into a secondary elongated current sheet that eventually breaks into plasmoids. Two distinctive viscous regimes are found for the plasmoid formation and saturation. In the low viscosity regime(i.e.Pr■1), the plasmoid width increases sharply with viscosity, whereas in the viscosity dominant regime(i.e.Pr■1), the plasmoid size gradually decreases with viscosity. Such a finding quantifies the role of viscosity in modulating the plasmoid formation process through its effects on the plasma flow and the reconnection itself.

引用

页码：20 / 31

页数：12

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