The polarity dependent effect of gyroviscosity on the flow shear stabilized Rayleigh-Taylor instability
The polarity dependent effect of gyroviscosity on the flow shear stabilized Rayleigh-Taylor instability
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DOI：
10.1063/1.1637608
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发表时间：
2003-10
期刊：
影响因子：
--
通讯作者：
E. Ruden
中科院分区：
文献类型：
--
作者：
E. Ruden
导出了均匀引力场中平衡密度和水平流体速度随深度变化的等温有限Larmor半径不可压缩等离子体模的线性色散关系。假设速度和磁场分别平行于波数和横向于波数。在两个和三个区域分段均匀的情况下，导出了具有剪切流动的加速等离子体层的Rayleigh-Taylor/Kelvin-Helmholtz模的稳定性判据和不稳定增长率图。当磁场方向反转时，回转粘性对大于某一临界值的波数的影响是不同的，其他条件相同，随方向不同而稳定或不稳定。这意味着具有剪切流动的磁加速等离子体的电极极性依赖关系，这与观察到如果中心导体是阳极时等离子体焦点通常具有更好的性能是一致的。..。
The linear dispersion relation is derived for modes of an isothermal finite Larmor radius incompressible plasma with an equilibrium density and horizontal fluid velocity varying with depth in a uniform gravitational field. The velocity and magnetic field are assumed parallel and transverse to the wave number, respectively. Stability criteria are derived and unstable growth rate diagrams plotted for the combined Rayleigh–Taylor/Kelvin–Helmholtz modes for two and three region piecewise uniform cases representing an accelerated plasma layer with sheared flow. The effect of gyroviscosity on wave numbers larger than a critical value is shown to differ if the direction of the magnetic field is reversed, all else being equal, being either stabilizing or destabilizing depending on direction. This implies an electrode polarity dependence for a magnetically accelerated plasma with sheared flow consistent with the observation that plasma foci generally have superior performance if the center conductor is the anode. ...