Microstructure formation in radially counterstreaming electron flows

Iñigo Gamiz, Lucas I and Ersfeld, Bernhard and Brunetti, Enrico and Yoffe, Samuel R and Cairns, R Alan and Noble, Adam and Holt, George K and Jaroszynski, Dino A (2021) Microstructure formation in radially counterstreaming electron flows. New Journal of Physics, 23 (4). 043017. ISSN 1367-2630 (https://doi.org/10.1088/1367-2630/abe8f6)

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Abstract

A theoretical model is developed to describe the formation of microstructures due to plasma streaming instabilities in radially convergent geometries. Microstructures in the form of radial spokes are found experimentally in laser wakefield accelerators. The eigenvalues of a set of coupled linear ordinary differential equations are obtained and the complex wavenumbers calculated to give the local growth rates. The predictions are confirmed using particle-in-cell (PIC) simulations carried out for two counter-propagating converging/diverging plasma annuli. The simulations consistently demonstrate unstable growth for interactions between two counterpropagating annuli with different number densities. The growth rates obtained from the PIC simulations agree well with the growth rates from the semi-analytical model. The theory presented in this paper can provide powerful insight into converging plasma beams found in space and laboratory scale plasma.

ORCID iDs

Ersfeld, Bernhard ORCID: https://orcid.org/0000-0001-5597-9429

Brunetti, Enrico ORCID: https://orcid.org/0000-0001-8302-9762

Yoffe, Samuel R ORCID: https://orcid.org/0000-0002-6723-4990

Noble, Adam ORCID: https://orcid.org/0000-0002-8181-7076

Jaroszynski, Dino A ORCID: https://orcid.org/0000-0002-3006-5492

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• Item metadata

  Item type:	Article
  ID code:	75615
  Dates:	Date Event 7 April 2021 Published 23 February 2021 Published Online 23 February 2021 Accepted
  Subjects:	Science > Physics
  Department:	Faculty of Science > Physics
  Depositing user:	Pure Administrator
  Date deposited:	03 Mar 2021 12:38
  Last modified:	14 Dec 2024 01:28
  Related URLs:	Scopus publication
  URI:	https://strathprints.strath.ac.uk/id/eprint/75615