TITLE

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

AUTHOR(S)
Dieckmann, M. E.; Kourakis, I.; Borghesi, M.; Rowlands, G.
PUB. DATE
July 2009
SOURCE
Physics of Plasmas;Jul2009, Vol. 16 Issue 7, p074502
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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.
ACCESSION #
43493827

 

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