Effects of compressibility on the finite Larmor radius stabilized Rayleigh-Taylor instability in Z-pinch implosions
Effects of compressibility on the finite Larmor radius stabilized Rayleigh-Taylor instability in Z-pinch implosions
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DOI：
10.1063/1.2837514
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发表时间：
2008-02-01
影响因子：
2.2
通讯作者：
Wang, S. A.
中科院分区：
文献类型：
--
作者：
Huang, L.;Jian, G. D.;Wang, S. A.
研究了压缩性对雷诺-泰勒（RT）不稳定性的影响。利用有限拉莫尔半径（FLR）磁流体动力学（MHD）理论，研究了磁场加速的FLR等离子体。通过引入各向异性离子应力张量，在MHD理论的动量方程中引入了FLR效应。导出了包含主要平衡量及其高阶微分项的线性模态方程。数值求解色散方程。结果表明：在可压缩FLR等离子体中，RT不稳定性的增长速率更快，波数范围更宽;在可压缩FLR等离子体中发现了一个新的分支，其真实的频率为正（与RT不稳定性的负真实的频率相反）。也就是说，等离子体压缩性是FLR稳定的RT不稳定性和新的不稳定性分支的不稳定因素。(c)2008年美国物理学会。
The effects of compressibility on the Rayleigh-Taylor (RT) instability in a. finite Larmor radius (FLR) plasma of magnetic field acceleration are studied by means of FLR magnetohydrodynamic (MHD) theory. FLR effects are introduced in the momentum equation of MHD theory through an anisotropic ion stress tensor. The linear mode equation which includes main equilibrium quantities and their high-order differential terms is derived. The dispersion equation is solved numerically. The main results indicate that in the compressible FLR plasma the growth rate of the RT instability displays faster growing and broader wavenumber range; and a new branch of low-frequency and long-wavelength instability, whose real frequency is positive (opposite from the negative real frequency of the RT instability), is found in the compressible FLR plasma. That is, plasma compressibility is a destabilizing factor for both the FLR stabilized RT instability and the new branch of instability. (c) 2008 American Institute of Physics.