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首页> 外文期刊>Plasma physics and controlled fusion >Observation of the ion-ion instability and its suppression mechanism in a dusty double plasma device
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Observation of the ion-ion instability and its suppression mechanism in a dusty double plasma device

机译：尘土双等离子体装置中离子不稳定性及其抑制机理的观察

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摘要

In a plasma system, ion-ion instability is excited due to the counter streaming of ion beams. An experiment has been carried out to observe the ion-ion instability in a dusty plasma device and in the presence of Ar as a background gas. The experiment is performed in a double plasma device which is 90 cm in diameter and 120cm in length, separated by a mesh grid of 81% optical transparency. Glass beads of 4 gm average diameters are used as dust grains for the whole set of experiments and are allowed to fall within a particular region of the plasma column inside the system. The growth and decay rate of the ion-ion instability is observed by shifting a probe spatially away from the grid in the target section with changing dust density in the system. Experiments have been carried out under different dust density conditions. According to our experimental findings, the suppression mechanism can be discussed in terms of the dust density inside the system. The distributions of ions, which are taking part in the formation of the instability, are also observed at the respective dust composition. The instability is found to be suppressed completely at a certain critical value of the dust density (N-dcr).
机译：在等离子体系统中，由于离子束的逆流而激发了离子-离子的不稳定性。已经进行了实验，以观察在尘土飞扬的等离子体装置中以及在作为背景气体的氩气存在下的离子-离子不稳定性。该实验在直径90厘米，长度120厘米，由透光度为81％的网格隔开的双等离子体装置中进行。在整个实验组中，平均直径为4 gm的玻璃珠被用作尘粒，并被允许落入系统内部等离子柱的特定区域内。通过在系统中改变粉尘密度，将探针从目标区域的网格移开，即可观察到离子离子不稳定性的增长和衰减速率。已经在不同的粉尘密度条件下进行了实验。根据我们的实验发现，抑制机理可以从系统内部的粉尘密度方面进行讨论。在各个粉尘成分处也观察到了参与形成不稳定性的离子的分布。发现在一定的粉尘密度（N-dcr）临界值下，可以完全抑制不稳定性。

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