Cycloid motions of grains in a dust plasma

被引:13
|
作者
Zhang, Yong-Liang [1 ]
Feng, Fan [1 ]
Liu, Fu-Cheng [1 ]
Dong, Li-Fang [1 ]
He, Ya-Feng [1 ]
机构
[1] Hebei Univ, Coll Phys Sci & Technol, Hebei Key Lab Opt Elect Informat Mat, Baoding 071002, Peoples R China
基金
中国国家自然科学基金;
关键词
dust plasma; irregular grain; cycloid motions; COMPLEX PLASMAS; PARTICLES; SHEATH;
D O I
10.1088/1674-1056/25/2/025201
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Hypocycloid and epicycloid motions of irregular grains (pine pollen) are observed for the first time in a dust plasma in a two-dimensional (2D) horizontal plane. These cycloid motions can be regarded as a combination of a primary circle and a secondary circle. An inverse Magnus force originating from the spin of the irregular grain gives rise to the primary circle. Radial confinement resulting from the electrostatic force and the ion drag force, together with inverse Magnus force, plays an important role in the formation of the secondary circle. In addition, the cyclotron radius is seen to change periodically during the cycloid motion. Force analysis and comparison experiments have shown that the cycloid motions are distinctive features of an irregular grain immersed in a plasma.
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页数:8
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