Cycloid Motions of Aggregates in a Dust Plasma

Hypocycloid and epicycloid motions of aggregates consisted of one large and one small grains are experimentally observed in an rf dust plasma.The cycloid motions are regarded as combination of a primary circle and a secondary circle.Measurements with high spatiotemporal resolution show that the seco...

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Bibliographic Details
Published in:Plasma science & technology 2016, Vol.18 (1), p.67-71
Main Author: 冯帆 张永亮 闫佳 刘富成 董丽芳 贺亚峰
Format: Article
Language:English
Subjects:
Aggregates
Asymmetry
Cycloids
Dust
Epicycloids
Grains
Microspheres
Resonant frequency
固有频率
实验观察
对比实验
小晶粒
尘埃等离子体
摆线运动
时空分辨率
聚集体
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Summary:Hypocycloid and epicycloid motions of aggregates consisted of one large and one small grains are experimentally observed in an rf dust plasma.The cycloid motions are regarded as combination of a primary circle and a secondary circle.Measurements with high spatiotemporal resolution show that the secondary circle is determined by the initial angle velocity of the dropped aggregate.The primary circle originates from the asymmetry of the aggregate.The small grain in the aggregate always leads the large one as they travelling,which results from the difference of the natural frequency of the two grains.Comparative experiments with regular microspheres show that the cycloid motions are distinctive features of aggregates immersed in a plasma.
ISSN:1009-0630
DOI:10.1088/1009-0630/18/1/12