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One-dimensional particle simulation of the filamentation instability: Electrostatic field driven by the magnetic pressure gradient force

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Dieckmann, M. E., Kourakis, I., Borghesi, M. and Rowlands, G. (George) (2009) One-dimensional particle simulation of the filamentation instability: Electrostatic field driven by the magnetic pressure gradient force. Physics of Plasmas, Vol.16 (No.7). Article no. 074502 . doi:10.1063/1.3160629 ISSN 1070-664X.

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Official URL: http://dx.doi.org/10.1063/1.3160629

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Abstract

Two counterpropagating cool and equally dense electron beams are modeled with particle-in-cell simulations. The electron beam filamentation instability is examined in one spatial dimension, which is an approximation for a quasiplanar filament boundary. It is confirmed that the force on the electrons imposed by the electrostatic field, which develops during the nonlinear stage of the instability, oscillates around a mean value that equals the magnetic pressure gradient force. The forces acting on the electrons due to the electrostatic and the magnetic field have a similar strength. The electrostatic field reduces the confining force close to the stable equilibrium of each filament and increases it farther away, limiting the peak density. The confining time-averaged total potential permits an overlap of current filaments with an opposite flow direction.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: Physics of Plasmas
Publisher: American Institute of Physics
ISSN: 1070-664X
Official Date: July 2009
Dates:
DateEvent
July 2009Published
Volume: Vol.16
Number: No.7
Number of Pages: 4
Page Range: Article no. 074502
DOI: 10.1063/1.3160629
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Queen's University Belfast, VetenskapsrAdet, DFG
Grant number: FOR1048

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