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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Hebei Key Laboratory of Optic-electronic Information Materials, College of Physics Science and Technology, Hebei UniversityHebei Key Laboratory of Optic-electronic Information Materials, College of Physics Science and Technology, Hebei University
张永亮
冯帆
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Hebei Key Laboratory of Optic-electronic Information Materials, College of Physics Science and Technology, Hebei UniversityHebei Key Laboratory of Optic-electronic Information Materials, College of Physics Science and Technology, Hebei University
机构:
Hebei Key Laboratory of Optic-electronic Information Materials, College of Physics Science and Technology, Hebei UniversityHebei Key Laboratory of Optic-electronic Information Materials, College of Physics Science and Technology, Hebei University
冯帆
张永亮
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Hebei Key Laboratory of Optic-electronic Information Materials, College of Physics Science and Technology, Hebei UniversityHebei Key Laboratory of Optic-electronic Information Materials, College of Physics Science and Technology, Hebei University
张永亮
闫佳
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Hebei Key Laboratory of Optic-electronic Information Materials, College of Physics Science and Technology, Hebei UniversityHebei Key Laboratory of Optic-electronic Information Materials, College of Physics Science and Technology, Hebei University
机构:
China Agr Univ, Coll Sci, Beijing 100083, Peoples R ChinaChina Agr Univ, Coll Sci, Beijing 100083, Peoples R China
Huang, F.
Peng, R. D.
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China Univ Min & Technol, State Key Lab Coal Resources & Safe Min, Beijing 100083, Peoples R ChinaChina Agr Univ, Coll Sci, Beijing 100083, Peoples R China
Peng, R. D.
Liu, Y. H.
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Qingdao Univ, Inst Complex Sci, Qingdao 266071, Peoples R ChinaChina Agr Univ, Coll Sci, Beijing 100083, Peoples R China
Liu, Y. H.
Chen, Z. Y.
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Beijing Univ Chem Technol, Dept Phys, Beijing 100029, Peoples R ChinaChina Agr Univ, Coll Sci, Beijing 100083, Peoples R China
Chen, Z. Y.
Ye, M. F.
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Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R ChinaChina Agr Univ, Coll Sci, Beijing 100083, Peoples R China