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arXiv 2109.12959physics.plasm-ph
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尘埃声孤波在尘埃等离子体中的反射

Reflection of a dust acoustic solitary wave in a dusty plasma

Krishan Kumar, P. Bandyopadhyay, Swarnima Singh, Garima Arora, A. Sen

摘要:

我们报告的第一个实验观测的反射尘埃声孤波从一个潜在的障碍在尘埃等离子体介质。实验是在一个倒置的$Π$形状的尘埃等离子体实验(DPEx)设备中进行的,在直流辉光放电等离子体环境中。尘埃声孤波是通过叠加在放电电压上的短负高斯脉冲调制等离子体激发的。孤立波结构被认为是朝着一个潜在的障碍,产生的鞘周围偏置的电线,并返回后反射的障碍。记录了孤子的振幅、宽度和速度随时间的变化。对不同势垒强度和不同初始孤立波振幅的情况重复实验。发现孤立波最接近势垒中心的距离随势垒强度的增大而增大,随初始波幅的减小而减小。发射探针用于测量鞘层电位及其厚度,通过测量连接到偏置线的电阻范围内的轴向方向上的等离子体电位分布。修正的Korteweg de Vries方程的推导和数值求解定性地了解实验结果。

英文摘要:

We report the first experimental observations of the reflection of a dust acoustic solitary wave from a potential barrier in a dusty plasma medium. The experiments have been carried out in an inverted $Π$-shaped Dusty Plasma Experimental (DPEx) device in a DC glow discharge plasma environment. The dust acoustic solitary wave is excited by modulating the plasma with a short negative Gaussian pulse that is superimposed over the discharge voltage. The solitary wave structure is seen to move towards a potential barrier, created by the sheath around a biased wire, and turn back after reflecting off the barrier. The amplitude, width, and velocity of the soliton are recorded as a function of time. The experiment is repeated for different strengths of the potential barrier and for different initial amplitudes of the solitary wave. It is found that the distance of the closest approach of the solitary wave to the centre of the barrier increases with the increase of the strength of the potential barrier and with the decrease of the initial wave amplitude. An emissive probe is used to measure the sheath potential and its thickness by measuring the plasma potential profile in the axial direction over a range of resistances connected to the biased wire. A modified Korteweg de Vries equation is derived and numerically solved to qualitatively understand the experimental findings.

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