多维性和能量交换对静电电流驱动等离子体不稳定性和湍流的影响

IF 2.1 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
Wai Hong Ronald Chan, Kentaro Hara, Iain D. Boyd
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引用次数: 0

摘要

在一维模拟中观测到了大振幅电流驱动的等离子体不稳定性,它可以过渡到布尼曼不稳定性,从而产生高能后流离子。我们研究了多维等离子体不稳定性的饱和及其对高能离子形成的影响。这类离子直接影响航天器推进器的寿命,并与磁重联和宇宙射线萌发有关。采用基于网格的直接动力学方法的欧拉 Vlasov-Poisson 求解器研究了 2D2V 无碰撞、静电流驱动不稳定性的增长和饱和,这些不稳定性分别跨越构型(D)和速度(V)空间的两个维度,支持离子和电子的相空间传输。此类不稳定性的电动势演变分为四个阶段:线性模态增长、谐波增长、通过准线性机制加速增长以及非线性填充和饱和湍流。其过渡和各向同性化过程与流体动力湍流的发展过程十分相似。虽然在等离子体波中观察到了各向同性的趋势,但在几个离子声周期之后,电子和离子相空间随之出现,高能后流离子的形成在 2D2V 模拟中比在 1D1V 模拟中受到更多限制。二维静电动能不稳定性形成的等离子体波可以沿垂直于电子净漂移的方向传播。因此,大振幅多维波会产生高能横向流离子,并最终限制高能逆向流离子沿纵向传播。这项多维研究揭示了纵向和横向静电等离子体不稳定性之间的相互作用,以及非磁化等离子体湍流萌发和维持的基本特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of multi-dimensionality and energy exchange on electrostatic current-driven plasma instabilities and turbulence
Large-amplitude current-driven plasma instabilities, which can transition to the Buneman instability, were observed in one-dimensional simulations to generate high-energy back-streaming ions. We investigate the saturation of multi-dimensional plasma instabilities and its effects on energetic ion formation. Such ions directly impact spacecraft thruster lifetimes and are associated with magnetic reconnection and cosmic ray inception. An Eulerian Vlasov–Poisson solver employing the grid-based direct kinetic method is used to study the growth and saturation of 2D2V collisionless, electrostatic current-driven instabilities spanning two dimensions each in the configuration (D) and velocity (V) spaces supporting ion and electron phase-space transport. Four stages characterise the electric potential evolution in such instabilities: linear modal growth, harmonic growth, accelerated growth via quasi-linear mechanisms alongside nonlinear fill-in and saturated turbulence. Its transition and isotropisation process bears considerable similarities to the development of hydrodynamic turbulence. While a tendency to isotropy is observed in the plasma waves, followed by electron and then ion phase spaces after several ion-acoustic periods, the formation of energetic back-streaming ions is more limited in the 2D2V than in the 1D1V simulations. Plasma waves formed by two-dimensional electrostatic kinetic instabilities can propagate in the direction perpendicular to the net electron drift. Thus, large-amplitude multi-dimensional waves generate high-energy transverse-streaming ions and eventually limit energetic backward-streaming ions along the longitudinal direction. The multi-dimensional study sheds light on interactions between longitudinal and transverse electrostatic plasma instabilities, as well as fundamental characteristics of the inception and sustenance of unmagnetised plasma turbulence.
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来源期刊
Journal of Plasma Physics
Journal of Plasma Physics 物理-物理:流体与等离子体
CiteScore
3.50
自引率
16.00%
发文量
106
审稿时长
6-12 weeks
期刊介绍: JPP aspires to be the intellectual home of those who think of plasma physics as a fundamental discipline. The journal focuses on publishing research on laboratory plasmas (including magnetically confined and inertial fusion plasmas), space physics and plasma astrophysics that takes advantage of the rapid ongoing progress in instrumentation and computing to advance fundamental understanding of multiscale plasma physics. The Journal welcomes submissions of analytical, numerical, observational and experimental work: both original research and tutorial- or review-style papers, as well as proposals for its Lecture Notes series.
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