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arXiv 1604.07985physics.plasm-ph
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束流等离子体不稳定性单波模型的可行性

On the viability of the single wave model for the beam plasma instability

Nakia Carlevaro, Giovanni Montani, Davide Terzani

摘要:

我们分析了冷快电子束与热化等离子体的相互作用,在许多朗缪尔模式的存在。这项工作的目的是在表征系统的行为从单模近似的偏差,无论是相对于最不稳定的模式谐波和相对于一个密集的频谱的存在下,包含线性不稳定和稳定的模式的一致的频谱分析。我们演示了如何,一方面,谐波吸收的总能量分数是可以忽略不计的(通过评估其总量),另一方面,额外的朗缪尔模式可以通过雪崩机制,负责在粒子速度空间中的运输被激发。特别是,我们表明,光谱展宽概述了一个普遍的形状和分布函数,相关的雪崩机制,有一个渐近高原,不同的相干结构表征的单波模型。

英文摘要:

We analyze the interaction of a cold fast electron beam with a thermalized plasma, in the presence of many Langmuir modes. The work aims at characterizing the deviation of the system behavior from the single mode approximation, both with respect to a consistent spectral analysis of the most unstable mode harmonics and with respect to the presence of a dense spectrum, containing linearly unstable and stable modes. We demonstrate how, on the one hand, the total energy fraction absorbed by the harmonics is negligible at all (by evaluating its total amount) and, on the other hand, the additional Langmuir modes can be excited via an avalanche mechanism, responsible for a transport in the particle velocity space. In particular, we show that the spectral broadening outlines a universal shape and the distribution function, associated to the avalanche mechanism, has an asymptotic plateau, differently from the coherent structures characterizing the single wave model.

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