中国物理B ›› 2016, Vol. 25 ›› Issue (2): 25201-025201.doi: 10.1088/1674-1056/25/2/025201
• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇 下一篇
Yong-Liang Zhang(张永亮), Fan Feng(冯帆), Fu-Cheng Liu(刘富成), Li-Fang Dong(董丽芳), Ya-Feng He(贺亚峰)
Yong-Liang Zhang(张永亮), Fan Feng(冯帆), Fu-Cheng Liu(刘富成), Li-Fang Dong(董丽芳), Ya-Feng He(贺亚峰)
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.
中图分类号: (Dusty or complex plasmas; plasma crystals)