Hall physics during magnetic reconnection with collision effect

IF 2.1 2区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
Yukang Shu, San Lu, Quanming Lu, Kai Huang, Rongsheng Wang, Weixing Ding
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Abstract

The Hall effect, decoupling between the ion and electron motions, is the core mechanism triggering fast reconnection. In plasmas with collision effects such as laboratory facilities, collision can suppress the Hall effect and influence the triggering of fast reconnection. Here, by conducting a series of kinetic simulations with varying collision parameters, we show that collisions can suppress the electron outflow, impairing the quadrupole Hall magnetic field. Besides, collision weakens the inflow of magnetic flux by reducing the charge separation and increasing the thermal pressure at the reconnection site, leading to a reduction of the Hall electric field. As the collisionality becomes larger, the Hall electric field diminishes more easily than the Hall magnetic field. We propose that the quadrupolar Hall magnetic field can be a significant indicator in reflecting Hall reconnection.
具有碰撞效应的磁重联过程中的霍尔物理学
霍尔效应是离子和电子运动之间的解耦,是触发快速重联的核心机制。在实验室设施等具有碰撞效应的等离子体中,碰撞会抑制霍尔效应并影响快速重联的触发。在这里,我们通过改变碰撞参数进行了一系列动力学模拟,结果表明碰撞可以抑制电子外流,损害四极霍尔磁场。此外,碰撞通过减少电荷分离和增加再连接点的热压来减弱磁通流入,从而导致霍尔电场减弱。随着碰撞性的增大,霍尔电场比霍尔磁场更容易减弱。我们认为四极霍尔磁场是反映霍尔重联的一个重要指标。
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来源期刊
Plasma Physics and Controlled Fusion
Plasma Physics and Controlled Fusion 物理-物理:核物理
CiteScore
4.50
自引率
13.60%
发文量
224
审稿时长
4.5 months
期刊介绍: Plasma Physics and Controlled Fusion covers all aspects of the physics of hot, highly ionised plasmas. This includes results of current experimental and theoretical research on all aspects of the physics of high-temperature plasmas and of controlled nuclear fusion, including the basic phenomena in highly-ionised gases in the laboratory, in the ionosphere and in space, in magnetic-confinement and inertial-confinement fusion as well as related diagnostic methods. Papers with a technological emphasis, for example in such topics as plasma control, fusion technology and diagnostics, are welcomed when the plasma physics is an integral part of the paper or when the technology is unique to plasma applications or new to the field of plasma physics. Papers on dusty plasma physics are welcome when there is a clear relevance to fusion.
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