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arXiv 1502.03283physics.plasm-phastro-ph.HE
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离子韦伯位移不稳定性的非线性动力学:等离子体演化和光谱特性的分析模型

Nonlinear dynamics of the ion Weibel-filamentation instability: an analytical model for the evolution of the plasma and spectral properties

C. Ruyer, L. Gremillet, A. Debayle, G. Bonnaud

摘要:

我们提出了一个预测模型的非线性相位的韦伯不稳定性引起的两个对称的,逆流离子束在非相对论制度。这种自洽模型将Davidson等人[Phys. Fluids 15,317(1972)]的准线性动力学理论与电流丝聚结的简单描述相结合。它使我们能够遵循的离子参数的演变到一个阶段接近完成各向同性,因此是最感兴趣的了解碰撞冲击形成的动力学。它的预测支持的2-D和3-D粒子在细胞模拟的离子韦伯不稳定性。导出的近似解析解揭示了离子弛豫对各向同性的各种依赖关系。特别是,它被发现的电子屏蔽的影响,可以影响使用非物理的电子质量的模拟结果。

英文摘要:

We present a predictive model of the nonlinear phase of the Weibel instability induced by two symmetric, counter-streaming ion beams in the non-relativistic regime. This self-consistent model combines the quasilinear kinetic theory of Davidson et al. [Phys. Fluids 15, 317 (1972)] with a simple description of current filament coalescence. It allows us to follow the evolution of the ion parameters up to a stage close to complete isotropization, and is thus of prime interest to understand the dynamics of collisionless shock formation. Its predictions are supported by 2-D and 3-D particle-in-cell simulations of the ion Weibel instability. The derived approximate analytical solutions reveal the various dependencies of the ion relaxation to isotropy. In particular, it is found that the influence of the electron screening can affect the results of simulations using an unphysical electron mass.

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