Modeling of magnetized collisional plasma sheath with nonextensive electron distribution and ionization source  

作　　者：陈龙 杨叶慧 安宇豪 段萍 孙少娟 崔作君 阚子晨 高维富 Long CHEN;Yehui YANG;Yuhao AN;Ping DUAN;Shaojuan SUN;Zuojun CUI;Zichen KAN;Weifu GAO(School of Science,Dalian Maritime University,Dalian 116026,People’s Republic of China)

机构地区：[1]School of Science,Dalian Maritime University,Dalian 116026,People’s Republic of China

出　　处：《Plasma Science and Technology》2023年第3期21-31,共11页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.11975062,11605021 and 11975088);the China Postdoctoral Science Foundation(No.2017M621120)。

摘　　要：The properties of an atmospheric-pressure collisional plasma sheath with nonextensively distributed electrons and hypothetical ionization source terms are studied in this work. The Bohm criterion for the magnetized plasma is extended in the presence of an ion–neutral collisional force and ionization source. The effects of electron nonextensive distribution, ionization frequency, ion–neutral collision, magnetic field angle and ion temperature on the Bohm criterion of the plasma sheath are numerically analyzed. The fluid equations are solved numerically in the plasma–wall transition region using a modified Bohm criterion as the boundary condition. The plasma sheath properties such as charged particle density, floating sheath potential and thickness are thoroughly investigated under different kinds of ion source terms, contributions of collisions, and magnetic fields. The results show that the effect of the ion source term on the properties of atmosphericpressure collisional plasma sheath is significant. As the ionization frequency increases, the Mach number of the Bohm criterion decreases and the range of possible values narrows. When the ion source is considered, the space charge density increases, the sheath potential drops more rapidly,and the sheath thickness becomes narrower. In addition, ion–neutral collision, magnetic field angle and ion temperature also significantly affect the sheath potential profile and sheath thickness.

关 键 词：plasma sheath Bohm criterion NONEXTENSIVITY ionization source 

分 类 号：O53[理学—等离子体物理]