玻璃箱内垂直粉尘链的相互作用力
Interaction force in a vertical dust chain inside a glass box
摘要：
少量的尘埃粒子团簇可用作等离子体诊断的探针。尘埃颗粒的数量以及簇的大小和形状可以很容易地控制，采用玻璃盒放置在GEC射频参考室内，以提供限制的灰尘。该盒内和较大等离子体室内的等离子体参数尚未充分确定。调整射频功率会改变等离子体的条件，从而导致团簇的结构变化。这种效应可以用来探测射频功率与等离子体其它参数之间的关系。本实验利用小团簇振荡的晃动和呼吸模式，研究了系统射频功率与玻璃盒内粒子电荷和等离子体屏蔽长度之间的关系。实验结果表明，随着箱内射频功率的增加，屏蔽长度和粉尘荷电量均减小。尘埃电荷随着功率的增加而减少，这可能表明离子捕获在鞘层中起着重要作用。
英文摘要：
Small number dust particle clusters can be used as probes for plasma diagnostics. The number of dust particles as well as cluster size and shape can be easily controlled employing a glass box placed within a GEC rf reference chamber to provide confinement of the dust. The plasma parameters inside this box and within the larger plasma chamber have not yet been adequately defined. Adjusting the rf power alters the plasma conditions causing structural changes of the cluster. This effect can be used to probe the relationship between the rf power and other plasma parameters. This experiment employs the sloshing and breathing modes of small cluster oscillations to examine the relationship between system rf power and the particle charge and plasma screening length inside the glass box. The experimental results provided indicate that both the screening length and dust charge decrease as rf power inside the box increases. The decrease in dust charge as power increases may indicate that ion trapping plays a significant role in the sheath.
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