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

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

doi:10.1063/1.5100728

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

Journal Article · 07 October 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5100728 · OSTI ID:1604929

^[1]; Kuranz, Carolyn ^[2]; Handy, Timothy ^[2];

^[3];

^[4]

Univ. of Michigan, Ann Arbor, MI (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
Univ. of Michigan, Ann Arbor, MI (United States); General Atomics, San Diego, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)

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 counterstreaming plasmas. In this paper, we perform analytical and numerical analyses 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. Furthermore, 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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States); University of Rochester, NY (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC02-76SF00515; NA0001944; NA0002956; NA0003869

OSTI ID:: 1604929

Report Number(s):: arXiv:1910.04070v1

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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