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 . ISSN 1070-664X

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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 > Physics
Journal or Publication Title:	Physics of Plasmas
Publisher:	American Institute of Physics
ISSN:	1070-664X
Official Date:	July 2009
Volume:	Vol.16
Number:	No.7
Number of Pages:	4
Page Range:	Article no. 074502
Identification Number:	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
URI:	http://wrap.warwick.ac.uk/id/eprint/17498

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