Natural fluctuations in un-magnetized and magnetized plasmas
Natural fluctuations in un-magnetized and magnetized plasmas
复制标题
非磁化和磁化等离子体的自然波动
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
U. Angelis
中科院分区：
文献类型：
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作者：
P. Tolias;S. Ratynskaia;A. Panarese;S. Longo;U. Angelis
在等离子体的涨落理论中仍然存在一些悬而未决的问题，因为在特定的区域内很难形成适当的理论方法和求解相关的方程。一个有前途的替代方法是基于第一性原理的直接微物理建模，成功地应用于中性稀薄流体。在这种方法中，一个大的合奏的带电粒子的运动方程数值求解，而相关性从统计分析的合奏在不同的时间。作为第一步，在这项工作中，我们验证的数据分析技术，在这种数值方案的情况下，忽略库仑相互作用的电子系综。模拟结果进行了比较与非磁化和磁化等离子体的“自然”波动的分析理论。对于后者，给出了任意平均分布函数的推导。
There are still open issues within the fluctuation theory of plasmas, in view of the difficulty of formulating adequate theoretical approaches and solving the related equations in particular regimes. A promising alternative approach is direct microphysical modeling based on first principles, as successfully applied to neutral rarefied fluids. Within this approach, the equations of motion of a large ensemble of charged particles are solved numerically while correlations are obtained from statistical analysis of the ensemble at different times. As a first step, in this work we validate the data analysis technique adopted in this numerical scheme for the case of an electron ensemble neglecting Coulomb interactions. The simulation results are compared with the analytical theory of ‘natural’ fluctuations for both un-magnetized and magnetized plasmas. For the latter, the derivations for arbitrary average distribution functions are presented.