Dust charging and levitating in a sheath of plasma containing energetic particles  

作　　者：欧靖 赵晓云 林滨滨 

机构地区：[1]Institute of Plasma Physics, Chinese Academy of Sciences [2]Magnetic Fusion Theory, Chinese Academy of Sciences [3]School of Physics and Electronic Engineering, Fuyang Normal University

出　　处：《Chinese Physics B》2018年第2期435-445,共11页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11475223);the National Magnetic Confinement Fusion Science Program of China(Grant No.2015GB101003);the JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics(Grant Nos.11261140328 and2012K2A2A6000443)

摘　　要：The structure of the sheath in the presence of energetic particles is investigated in the multi-fluid framework. Based on the orbital motion limited（OML） theory, the dust grain charging inside the sheath of plasma containing energetic particles is examined for the carbon wall, and then the effect of the energetic particles on the stationary dust particle inside the sheath is discussed through the trapping potential energy. It is found that with the increase of energetic ion concentration or energy,the size of dust staying in levitation equilibrium decreases and the levitating position is much closer to the wall. In the case of deuterium ions as energetic ions, the bigger dust particle can be trapped by the sheath than in the case of hydrogen ions as energetic ions. When the energetic electron component is present, the levitating position of dust particle in the sheath depends strongly on the energetic electron. The levitating dust particle is closer to the wall as the energetic electron energy or concentration is increased. In addition, with the increase of temperature of thermal background ion, the size of dust particle trapped by the sheath decreases and the levitating positions of dust particles with the same size radius inside the sheath move toward the wall. Our results can be helpful in investigating the property of the sheath where the energetic particle component is present.The structure of the sheath in the presence of energetic particles is investigated in the multi-fluid framework. Based on the orbital motion limited（OML） theory, the dust grain charging inside the sheath of plasma containing energetic particles is examined for the carbon wall, and then the effect of the energetic particles on the stationary dust particle inside the sheath is discussed through the trapping potential energy. It is found that with the increase of energetic ion concentration or energy,the size of dust staying in levitation equilibrium decreases and the levitating position is much closer to the wall. In the case of deuterium ions as energetic ions, the bigger dust particle can be trapped by the sheath than in the case of hydrogen ions as energetic ions. When the energetic electron component is present, the levitating position of dust particle in the sheath depends strongly on the energetic electron. The levitating dust particle is closer to the wall as the energetic electron energy or concentration is increased. In addition, with the increase of temperature of thermal background ion, the size of dust particle trapped by the sheath decreases and the levitating positions of dust particles with the same size radius inside the sheath move toward the wall. Our results can be helpful in investigating the property of the sheath where the energetic particle component is present.

关 键 词：sheath energetic particles dust particle 

分 类 号：O53[理学—等离子体物理]