等离子体中强朗缪尔振荡不稳定性下密度空腔的形成机制

IF 2.8 4区 生物学
V. Kuklin
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引用次数: 0

摘要

本文研究了非等温(Zakharov模型)和冷(Silin模型)一维等离子体中剧烈朗缪尔振荡的不稳定性。主要关注的是在流体动力学和杂化(用流体动力学描述电子,用模型粒子描述离子)表示中等离子体密度空洞的形成。在流体力学表示中,在少量的谱模式下,观察到大规模的等离子体密度空洞,这些空洞迅速加深。小尺度扰动的出现支持了这一过程,并且观察到不稳定谱的Langmuir波的相位同步。这种光谱模式的相位同步非常有能力实现先前提出的仅用于由场从腔中挤出粒子的影响的作用。在混合模型中,在考虑的区域内,离子用模型粒子来描述,在一维情况下,模型粒子的个数为104-5*105(在三维情况下,模型粒子的个数为1012-1014)。扰动的初始谱非常宽且相当强烈,这导致了Zakharov模型中扰动的爆炸性增长和Silin模型中不稳定性的迅速发展。在这种情况下,在发达的不稳定状态下,观察到许多小规模等离子体密度空洞的形成。正是由于费米效应的这种小尺度调制的存在,迅速形成了离子在速度上的正态分布。在这种情况下,由于朗道阻尼引起的颗粒加热的影响失去了首要地位。结果表明,洞室实际上不改变其位置;未观察到等离子体密度光谱成分的相变。只有个别的小尺度洞室表现出与水动力学描述中洞室发展相似的动力学。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On the Mechanisms of Formation of Density Cavities under Instability of Intense Langmuir Oscillations in a Plasma
The paper considers the instability of intense Langmuir oscillations in nonisothermal (Zakharov's model) and cold (Silin's model) 1D plasma. The main attention is paid to the formation of plasma density caverns in the hydrodynamic and hybrid (electrons are described hydrodynamically, ions are described by model particles) representations. In the hydrodynamic representation, with a small number of spectrum modes, large-scale plasma density caverns are observed, which rapidly deepen. This process is supported by the appearance of small-scale perturbations, and phase synchronization of the Langmuir waves of the instability spectrum is observed. This phase synchronization of the spectrum modes is quite capable of fulfilling the role that was previously proposed to be given exclusively to the effect of extrusion of particles from the cavity by the field. In hybrid models, in the region of consideration, ions are described by model particles, the number of which in the one-dimensional case 104-5*105 (which in the three-dimensional case corresponds to the number of particles 1012-1014). The initial spectrum of perturbations is very wide and rather intense, which leads to an explosive growth of perturbations in the Zakharov model and a rapid development of instability in the Silin model. In this case, in the developed instability regime, the formation of many small-scale plasma density caverns is observed. It is the presence of this small-scale modulation due to the Fermi effect that quickly forms the normal distribution of ions over velocities. In this case, the effect of particle heating due to Landau damping loses its primacy. It is shown that the caverns practically do not change their position; phase changes for the spectral components of the plasma density were not observed. Only individual small-scale caverns demonstrate dynamics similar to the development of caverns in the hydrodynamic representation.
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来源期刊
3 Biotech
3 Biotech BIOTECHNOLOGY & APPLIED MICROBIOLOGY-
自引率
0.00%
发文量
314
期刊介绍: 3 Biotech publishes the results of the latest research related to the study and application of biotechnology to: - Medicine and Biomedical Sciences - Agriculture - The Environment The focus on these three technology sectors recognizes that complete Biotechnology applications often require a combination of techniques. 3 Biotech not only presents the latest developments in biotechnology but also addresses the problems and benefits of integrating a variety of techniques for a particular application. 3 Biotech will appeal to scientists and engineers in both academia and industry focused on the safe and efficient application of Biotechnology to Medicine, Agriculture and the Environment.
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