复杂（尘埃）等离子体中大浮球周围的空腔理论
Theory of a cavity around a large floating sphere in complex (dusty) plasma
摘要：
在国际空间站上的PK-3 Plus实验室的最后一次实验中，研究了毫米级金属球与复杂等离子体的相互作用。Schwabe { \it等人}，New J. Phys. { \bf 19}，103019（2017）]。观察到的现象之一是在球体周围形成空腔（没有形成复杂等离子体的微粒的区域）。空腔的尺寸由空腔边缘处的微粒所经受的力的平衡决定。在这篇文章中，我们开发了一个详细的理论模型描述的腔的大小，并证明它同意与实验测量的大小。该模型是基于一个简单的实用表达式的离子拖曳力，这是构造考虑到同时考虑到非线性离子粒子耦合和离子中性碰撞的影响。所开发的模型可以用于描述大质量体和周围的复杂等离子体之间的相互作用，在一个相当宽的参数制度。
英文摘要：
In the last experiment with the PK-3 Plus laboratory onboard the International Space Station, interactions of millimeter-size metallic spheres with a complex plasma were studied~[M. Schwabe {\it et al.}, New J. Phys. {\bf 19}, 103019 (2017)]. Among the phenomena observed was the formation of cavities (regions free of microparticles forming a complex plasma) surrounding the spheres. The size of the cavity is governed by the balance of forces experienced by the microparticles at the cavity edge. In this article we develop a detailed theoretical model describing the cavity size and demonstrate that it agrees well with sizes measured experimentally. The model is based on a simple practical expression for the ion drag force, which is constructed to take into account simultaneously the effects of non-linear ion-particle coupling and ion-neutral collisions. The developed model can be useful for describing interactions between a massive body and surrounding complex plasma in a rather wide parameter regime.
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