有限源低杂波对等离子体的能量和动量沉积

N. Nakajima, H. Abe, R. Itatani
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引用次数: 15

摘要

采用粒子模拟的方法研究了低杂波的加热和电流产生。与以往只处理单一模态的工作不同,本工作的主要兴趣集中在由许多傅里叶展开模态组成的传播锥的物理问题上。研究发现,冷等离子体近似和WKB方法都能很好地描述到混合共振下层的传播锥轨迹。观察到离子因质动势引起的跨场漂移。这项工作的一个主要发现是,天线频谱上部的模式在离子高能尾的产生中起着关键作用。这一过程不能用线性理论来解释,从各模态阻尼的时变来判断,称为级联过程。采用拉长网格和二次空间插值对粒子模型进行了改进。该模型在其他问题模拟中的应用…
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Energy and Momentum Deposition to Plasmas due to the Lower Hybrid Wave by a Finite Source
Heating and current generation due to the lower hybrid wave are studied using particle simulation. In contrast with previous work, where only a single mode is treated, the main interest of this work is focused on the physical problems of a propagation cone consisting of many Fourier‐expanded modes. It is found that the trajectory of the propagation cone is well described up to the lower hybrid resonance layer using both the cold plasma approximation and the WKB method. An ion cross‐field drift due to the ponderomotive force is observed. A main discovery of this work is that the modes in the upper portion of the spectrum of the antenna play a key role in the creation of the ion high‐energy tail. This process cannot be explained by the linear theory and is called the cascade process judging from the time variation of the damping of each mode. The particle model is significantly improved using the elongated grid and the quadratic spatial interpolation. Applications of this model to simulations of other probl...
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