Formation and stability of polarization sheaths of a cross-field beam
Formation and stability of polarization sheaths of a cross-field beam
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交叉场光束偏振鞘的形成和稳定性
DOI：
10.1063/1.860226
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
O. Buneman
中科院分区：
文献类型：
--
作者：
D. Cai;O. Buneman
如果等离子体层（例如与航天飞机一起运动的等离子体层）两侧有“极化鞘”，从而产生 E×B 漂移所需的 E 场，则它可以穿过磁场。这些正负鞘层的自发演化和稳定性都可以通过与磁控管型电子器件中的电荷配置的类比来研究。也就是说，正则动量守恒导致“布里渊流”，即中性等离子体束一侧的纯离子鞘层和另一侧的纯电子鞘层中的剪切流。获得了该流动的平衡参数并分析了平衡的稳定性。人们发现离子和电子鞘层在一种被称为“磁控管”、“滑流”或“双电子管”的模式下是一维稳定的和二维不稳定的。这种模式与中性物质中的开尔文-亥姆霍兹不稳定性有关。分析结果得到了定性和定量的证实...
A layer of plasma (such as that comoving with the space shuttle) can travel across a magnetic field if it is flanked by ‘‘polarization sheaths’’ that create the E field necessary for E×B drift. Both the spontaneous evolution and the stability of these positive and negative sheaths can be studied by their analogy with the charge configuration in magnetron‐type electron devices. That is, conservation of canonical momentum results in ‘‘Brillouin flow,’’ i.e., shear flows in a pure ion sheath on one side and a pure electron sheath on the other side of the neutral plasma beam. The equilibrium parameters of this flow were obtained and the stability of the equilibria was analyzed. Both the ion and electron sheaths were found to be one‐dimensionally stable and two‐dimensionally unstable in a mode variously known as ‘‘magnetron,’’ ‘‘slipping stream,’’ or ‘‘diocotron.’’ This mode connects up with the Kelvin–Helmholtz instability in neutral matter. The analytical results were confirmed both qualitatively and quantit...