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arXiv 1905.12929physics.plasm-ph
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束-等离子体不稳定性的准线性模型:自洽演化分析

Quasi-linear model for the beam-plasma instability: analysis of the self-consistent evolution

Giovanni Montani, Francesco Cianfrani, Nakia Carlevaro

摘要:

我们重新分析了准线性自洽动力学的束等离子体不稳定性,通过比较相应的哈密顿系统的理论预测和数值模拟。虽然渐近动力学的扩散功能的可靠预测,早期的时间中尺度输送出现不太有效地再现对流功能的自洽方案。其结果是,我们确定的基础准线性模型假设的分布函数是准平稳的观察到的差异的起源。此外,我们提供了一个修正的瞬时准线性增长率的基础上的线性扩展的分布函数的时间依赖性,我们成功地测试了这个修订后的配方在时间的中尺度谱演化。

英文摘要:

We re-analyze the quasi-linear self consistent dynamics for the beam-plasma instability, by comparing the theory predictions to numerical simulations of the corresponding Hamiltonian system. While the diffusive features of the asymptotic dynamics are reliably predicted, the early temporal mesoscale transport appears less efficient in reproducing the convective feature of the self-consistent scenario. As a result, we identify the origin of the observed discrepancy in the underlying quasi-linear model assumption that the distribution function is quasi-stationary. Furthermore, we provide a correction to the instantaneous quasi-linear growth rate based on a linear expansion of the distribution function time dependence, and we successfully test this revised formulation for the spectral evolution during the temporal mesoscale.

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