The Effect of an External Magnetic Field on the Plume Expansion Dynamics of Laser-Induced Aluminum Plasma
The Effect of an External Magnetic Field on the Plume Expansion Dynamics of Laser-Induced Aluminum Plasma
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DOI：
10.1088/1009-0630/17/8/14
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发表时间：
2015-03
影响因子：
1.7
通讯作者：
Atif Hussain;Q. Li 李;Z. Hao 郝;X. Gao 高;J. Lin 林
中科院分区：
文献类型：
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作者：
Atif Hussain;Q. Li 李;Z. Hao 郝;X. Gao 高;J. Lin 林
在这项工作中，我们研究了 Nd:YAG 激光诱导的等离子体形态，目的是提高对有磁场和无磁场两种情况下等离子体的形成和动力学的理解。使用空气中的铝靶在不存在和存在磁场的情况下产生等离子体的单激光脉冲。采用快速摄影技术来获取有关每种情况下铝等离子体的膨胀动力学和限制的信息。激光等离子体的产生被允许在具有不同磁场强度的两个位置处扩展，这对应于两个磁极中心的0.58T的强度和距上极（N）4mm处的0.83T的强度。当目标放置在两极的中心时，羽流在较长的延迟下显示出横向限制。当目标放置在距离上极 4 毫米处时，观察到羽流在初始阶段分为两个叶，并随着时间的推移向磁场中心移动。
In this work, we investigated the plasma morphology induced by a Nd:YAG laser with the aim of improving the understanding of the formation and dynamics of the plasma in two cases, with and without a magnetic field. Single laser pulse production of a plasma in the absence and presence of a magnetic field was performed with an aluminum target in air. A fast photography technique was employed to obtain information about the expansion dynamics and confinement of the aluminum plasma in each case. The generation of the laser plasma was allowed to expand at two locations with different magnetic field strengths, which correspond to the strength 0.58 T in the center of two magnetic poles and 0.83 T at a distance of 4 mm from the upper pole (N). The plume showed lateral confinement at longer delays when the target was placed at the center of the two poles. When the target was placed at a distance of 4 mm from the upper pole it was observed that the plume was divided into two lobes at the initial stage and traveled towards the center of the magnetic field with further elapse of time.