Parametric instabilities in finite inhomogeneous media
Parametric instabilities in finite inhomogeneous media
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DOI：
10.1103/physrevlett.33.1013
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发表时间：
1974-10
影响因子：
8.6
通讯作者：
D. Dubois;D. Forslund;E. Williams
中科院分区：
文献类型：
--
作者：
D. Dubois;D. Forslund;E. Williams
对有限尺寸非均匀等离子体的一般一阶参数不稳定性方程进行了解析和数值求解。结果表明，波数失配引入等离子体梯度并不一定转化为对流不稳定的绝对不稳定性，即使是大系统。当系统的长度由增长率的平滑空间依赖性决定时，也会出现绝对不稳定性。
The general first-order parametric-instability equations for an inhomogeneous finite-size plasma are solved both analytically and numerically. It is shown that the wave-number mismatch introduced by plasma gradients does not necessarily convert absolute instability into convective instability, even for large systems. Absolute instability can also occur when the length of the system is determined by a smooth spatial dependence of the growth rate.