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arXiv 1910.04070physics.plasm-ph
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用质子图像的傅里叶分析表征逆流等离子体中的磁性结构

Characterizing filamentary magnetic structures in counter-streaming plasmas by Fourier analysis of proton images

Joseph Levesque, Carolyn Kuranz, Timothy Handy, Mario Manuel, Frederico Fiuza

摘要:

质子成像是探测等离子体中电磁场的有力工具,可提供场拓扑的路径集成图。然而,在场结构高度不均匀的情况下,从质子图像推断基础场的空间特性可能是困难的。这个问题的例子是最近的实验,使用质子成像探测的无碰撞逆流等离子体中的韦伯不稳定性所产生的附加磁场结构。在本文中,我们进行分析和数值分析的质子图像的系统包含许多磁丝。我们发现,在一般情况下,质子图像上观察到的功能并不直接对应于磁丝之间的间距(磁波长),如先前所假设的,而是对应于细丝的大小。我们证明了这一结果的合成质子图像的傅立叶分析许多随机配置的磁丝。我们的结果有助于指导解释实验质子图像的等离子体中的磁性结构。

英文摘要:

Proton imaging is a powerful tool for probing electromagnetic fields in a plasma, providing a path-integrated map of the field topology. However, in cases where the field structure is highly inhomogeneous, inferring spatial properties of the underlying field from proton images can be difficult. This problem is exemplified by recent experiments which used proton imaging to probe the filamentary magnetic field structures produced by the Weibel instability in collisionless counter-streaming plasmas. In this paper, we perform analytical and numerical analysis of proton images of systems containing many magnetic filaments. We find that, in general, the features observed on proton images do not directly correspond to the spacing between magnetic filaments (the magnetic wavelength) as has previously been assumed, and that they instead correspond to the filament size. We demonstrate this result by Fourier analysis of synthetic proton images for many randomized configurations of magnetic filaments. Our results help guide the interpretation of experimental proton images of filamentary magnetic structures in plasmas.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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