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首页> 外文期刊>Plasma physics and controlled fusion >Pressure triggered collective oscillations of a dust crystal in a capacitive RF plasma
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Pressure triggered collective oscillations of a dust crystal in a capacitive RF plasma

机译：压力触发电容式RF等离子体中尘埃晶体的集体振荡

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摘要

Experimental results of vertical oscillations of dust grains in the driven electrode sheath of a capacitive RF plasma are presented. Below a certain pressure, waves suddenly start to propagate in the lower planes of a plasma crystal. Further decreasing the pressure causes the waves to spread in the entire dust cloud. The waves are found to propagate at constant frequency but with a higher phase velocity as the pressure is reduced. A mechanism based on the ion-dust two-stream instability is proposed to explain the observations. From the numerical solution the wave frequency is found to be highly dependent on the value chosen for the dust charge and so gives a diagnostic method for determining the charge on the dust.
机译：给出了电容式射频等离子体的驱动电极护套中尘粒垂直振动的实验结果。在一定压力以下，波突然开始在等离子晶体的下平面传播。进一步降低压力会导致波在整个尘埃云中传播。发现这些波以恒定的频率传播，但是随着压力的降低，它们具有更高的相速度。提出了一种基于离子粉尘两流不稳定性的机理来解释这些现象。从数值解中，发现波频率高度依赖于为粉尘电荷选择的值，因此提供了一种确定粉尘电荷的诊断方法。

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