介质颗粒在尘埃等离子体金属棘轮中的运动  

Motion of dielectric particles in dust plasma metal ratchet

作　　者：宋超 戴超星 王瑞琦[1] 孙文涛 郭志强 刘富成[1] 贺亚峰[1] SONG Chao;DAI Chaoxing;WANG Ruiqi;SUN Wentao;GUO Zhiqiang;LIU Fucheng;HE Yafeng(College of Physics Science and Technology,Hebei University,Baoding 071002,China)

机构地区：[1]河北大学物理科学与技术学院

出　　处：《河北大学学报（自然科学版）》2020年第1期7-11,共5页Journal of Hebei University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11975089);河北省自然科学基金资助项目(A2017201099);河北省教育厅重点项目(ZD2015025);河北省青年拔尖人才基金资助项目

摘　　要：通过实验研究了等离子体环境中金属棘轮对介质尘埃颗粒的整流过程.单分散聚苯乙烯颗粒悬浮在处于等离子体环境中的金属棘轮通道内,通过调节气压和放电功率实现了对颗粒的整流,颗粒在锯齿通道内做可控性定向运动.实验中只观察到颗粒的逆向运动.由于金属棘轮电势低,其表面较厚的鞘层对颗粒形成较强的约束,颗粒受到的非平衡切向离子拖曳合力更大,这将引起颗粒更快的定向运动.实验结果为建立尘埃等离子体棘轮模型奠定基础.The rectification of dust particles in a metal ratchet in plasma environment is studied experimentally.The monodisperse polystyrene particles are suspended in a metal ratchet channel.The direction of particle flows can be controlled by adjusting the gas pressure and the discharge power.In the experiment,only the negative motion of the particles occurs.Due to the low potential of the metal ratchet,the thicker sheath on the surface forms a strong constraint on the particles.Therefore,the nonequilibrium force of ion drag in the azimuthal direction becomes stronger,which results in fast flow of dust particles along the saw channel.The experimental results lay the foundation for the establishment of a dust plasma ratchet model.

关 键 词：尘埃等离子体 金属棘轮 离子拖曳力 

分 类 号：O531[理学—等离子体物理]