Instability of Penning‐Type Discharges
Instability of Penning‐Type Discharges
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DOI：
10.1063/1.1706878
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发表时间：
1963
影响因子：
4.6
通讯作者：
F. C. Hoh
中科院分区：
文献类型：
--
作者：
F. C. Hoh
研究表明，在轴向磁场和向内指向的径向电场（较高气压下的潘宁放电）中的弱电离等离子体柱，对于宏观的m = 1扰动是不稳定的。通过量纲分析对这种不稳定性进行了分析。讨论了该方法的适用性。建立了一些实验性潘宁放电的稳态模型。基于此模型，理论所预测的不稳定性起始的临界磁场与观测值吻合良好。这里所讨论的不稳定性是由电子 - 离子等离子体中存在第三种流体（中性粒子）引起的。相同的机制也适用于一些单极型旋转等离子体的初始阶段。
It is shown that a weakly ionized plasma column in an axial magnetic field and an inward‐directed radial electric field—a Penning discharge at higher pressures—is unstable against a macroscopic m = 1 perturbation. The instability is analyzed by dimensional analysis. The applicability of this method is discussed. A steady‐state model of some experimental Penning discharges is developed. On the basis of this model, the critical magnetic field for the onset of instability as predicted by the theory agrees well with the values observed. The instability discussed here is caused by the presence of a third fluid, the neutrals, in an electron‐ion plasma. The same mechanism is also applicable to the initial phase of some rotating plasmas of the homopolar type.