New insights into the physics of rotating spokes in partially magnetized E x B plasmas

被引：25

作者：

Boeuf, J. P. ^{[1
]}

Takahashi, M. ^{[2
]}

机构：

[1] Univ Toulouse, LAPLACE, CNRS, INPT,UPS, 118 Route Narbonne, F-31062 Toulouse, France

[2] Tohoku Univ, Dept Aerosp Engn, Sendai, Miyagi 9808579, Japan

来源：

PHYSICS OF PLASMAS | 2020年 / 27卷 / 08期

关键词：

DIOCOTRON INSTABILITY; ELECTRON;

D O I：

10.1063/5.0014357

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Regions of enhanced light emission rotating in the azimuthal direction ("rotating spokes") have been observed in different types of partially magnetized E x B plasma devices such as magnetron discharges and Hall thrusters. A two-dimensional Particle-In-Cell Monte Carlo Collision (PIC MCC) model is used to study the formation of these rotating structures. The model shows that these current driven rotating structures are the results of a Simon-Hoh instability evolving into an ionization instability. The spoke is sustained by local electron heating induced by del B drift along a double layer separating the cathodic presheath from the plasma at a potential close to the anode potential. The PIC MCC simulations predict that spoke rotation can take place in the +E x B direction and in the -E x B direction depending on the magnetic field intensity. Published under license by AIP Publishing.

引用

页数：14

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