Experiments and gyrokinetic simulations of the nonlinear interaction between spinning magnetized plasma pressure filaments

IF 2 3区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS
R. D. Sydora, T. Simala-Grant, S. Karbashewski, F. Jimenez, B. Van Compernolle, M. J. Poulos
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Abstract

A set of experiments using controlled, skin depth-sized plasma pressure filaments in close proximity have been carried out in a large linear magnetized plasma device. Two- and three-filament configurations have been used to determine the scale of cross field nonlinear interaction. When the filaments are separated by a distance of approximately five times the size of a single filament or less, a significant transfer of charge and energy occurs, leading to the generation of inter-filament electric fields. This has the effect of rotating the filaments and influencing the merging dynamics. Nonlinear gyrokinetic simulations using seeded filaments confirm the presence of unstable drift-Alfvén modes driven by the steep electron temperature gradient. When the filaments are within a few collisionless electron skin depths (separations twice the size of a single filament), the unstable perturbations drive the convective mixing of the density and temperature and rearrange the gradients such that they maximize in the region surrounding the filament bundle.
旋转磁化等离子体压力丝之间非线性相互作用的实验和陀螺动力学模拟
我们在一个大型线性磁化等离子体装置中进行了一系列实验,使用了受控的、皮深大小的等离子体压力丝。双丝和三丝配置用于确定交叉磁场非线性相互作用的规模。当灯丝之间的距离约为单根灯丝的五倍或更小时,电荷和能量就会发生大量转移,从而产生灯丝间电场。这将使灯丝旋转并影响合并动力学。利用种子细丝进行的非线性陀螺动力学模拟证实,在陡峭的电子温度梯度驱动下,存在不稳定的漂移-阿尔夫文模式。当丝状体处于几个无碰撞电子皮深范围内(距离是单个丝状体大小的两倍)时,不稳定扰动会驱动密度和温度的对流混合,并重新排列梯度,使其在丝束周围区域达到最大。
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来源期刊
Physics of Plasmas
Physics of Plasmas 物理-物理:流体与等离子体
CiteScore
4.10
自引率
22.70%
发文量
653
审稿时长
2.5 months
期刊介绍: Physics of Plasmas (PoP), published by AIP Publishing in cooperation with the APS Division of Plasma Physics, is committed to the publication of original research in all areas of experimental and theoretical plasma physics. PoP publishes comprehensive and in-depth review manuscripts covering important areas of study and Special Topics highlighting new and cutting-edge developments in plasma physics. Every year a special issue publishes the invited and review papers from the most recent meeting of the APS Division of Plasma Physics. PoP covers a broad range of important research in this dynamic field, including: -Basic plasma phenomena, waves, instabilities -Nonlinear phenomena, turbulence, transport -Magnetically confined plasmas, heating, confinement -Inertially confined plasmas, high-energy density plasma science, warm dense matter -Ionospheric, solar-system, and astrophysical plasmas -Lasers, particle beams, accelerators, radiation generation -Radiation emission, absorption, and transport -Low-temperature plasmas, plasma applications, plasma sources, sheaths -Dusty plasmas
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