磁化电子流体涡旋中单开尔文-亥姆霍兹高阶波的共振激发

IF 2.1 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
G. Maero, N. Panzeri, L. Patricelli, M. Romé
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引用次数: 0

摘要

由于漂泊松方程和欧拉方程之间的同构性,可以在Penning-Malmberg陷阱中磁化的单组分等离子体中进行无粘二维流体实验。在这个类比中,一个被捕获的电子等离子体柱相当于一个二维涡旋。在这里,我们将注意力集中在v态的产生上,即$l$ -fold对称旋转涡量斑块,其中相对于圆形截面的变形已经达到非线性状态。我们详细介绍了线性理论分析,并设计了一个实验程序,通过在磁化电子等离子体中精确激发单开尔文-亥姆霍兹微扰来产生v态。该技术利用合适的多极旋转电场,可以选择所需的波模。特别是在旋转场中,消除了最高可达模式的硬件限制,可以获得一般阶$l$的非线性开尔文-亥姆霍兹波,这为进一步研究v态的演化和稳定性特性铺平了道路。讨论了在线性和非线性状态下直至饱和和崩溃的选择模式生长的系统实验结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Resonant excitation of single Kelvin–Helmholtz high-order waves in a magnetized electron fluid vortex
Thanks to the isomorphism between the drift-Poisson and Euler equations, inviscid two-dimensional fluid experiments can be performed in magnetized, single-component plasmas in Penning–Malmberg traps. Within this analogy, a trapped electron plasma column is equivalent to a two-dimensional vortex. Here, we focus our attention on the generation of V-states, i.e. $l$ -fold symmetric rotating vorticity patches where the deformation with respect to the circular cross-section has reached the nonlinear regime. We detail a linear theoretical analysis and devise an experimental routine to generate V-states through the precise excitation of single Kelvin–Helmholtz perturbations in a magnetized electron plasma. This technique makes use of suitable multipolar rotating electric fields, which are shown to be able to select the desired wavemode. In particular, with rotating fields, a hardware limitation in the highest accessible mode is removed and nonlinear Kelvin–Helmholtz waves of generic order $l$ can be attained, which pave the way for further investigations on the evolution and stability properties of V-states. Systematic experimental results for the selective mode growth in the linear and nonlinear regimes up to saturation and collapse are discussed.
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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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