SOME INVESTIGATIONS OF NONLINEAR BEHAVIOR IN ONE-DIMENSIONAL PLASMAS.
SOME INVESTIGATIONS OF NONLINEAR BEHAVIOR IN ONE-DIMENSIONAL PLASMAS.
复制标题
一维等离子体非线性行为的一些研究。
DOI：
10.1063/1.1692136
复制
发表时间：
1968
期刊：
影响因子：
--
通讯作者：
R. Shanny
中科院分区：
文献类型：
--
作者：
J. Dawson;R. Shanny
利用一维电子等离子体的数值实验对非线性等离子体现象进行了深入的研究。进行了三个实验。第一个是处理大振幅波的阻尼，发现它比线性理论预测的要强得多。提出了阻尼的粗略理论。第二个实验检验了模-模耦合。在采取预防措施以避免其他影响，特别是“被困”粒子的影响后，发现定量与理论一致。给出了“诱捕”的一个粗略理论。第三个实验检验了由分布函数尾部的一个小凸起产生的弱湍流，目前的理论似乎不足以描述这种行为。在初始生长后，不稳定模式在10ωp−1的时间尺度上波动。速度分布尾部的凸起在短时间内（20ωp−1）趋于平缓，然后演变成与主等离子体长期共存的热高斯尾巴（约1000 ωp−1）。P…
Numerical experiments on a one‐dimensional electron plasma were used to obtain an insight into nonlinear plasma phenomena. Three experiments were carried out. The first dealt with the damping of a large‐amplitude wave which is found to be much stronger than that predicted by linear theory. A rough theory for the damping is presented. The second experiment examined mode‐mode coupling. Quantitative agreement was found with theory after precautions were taken to avoid other effects, in particular, “trapped” particles. A rough theory for “trapping” is given. The third experiment examined the weak turbulence produced by a small bump in the tail of the distribution function, and present theory appears inadequate to describe this behavior. After initial growth, the unstable modes fluctuate on a time scale of 10ωp−1. The bump in the tail of the velocity distribution flattens out in a short time (20ωp−1), and then evolves into a hot Gaussian tail which coexists with the main plasma for a long time (≳ 1000 ωp−1). P...