One-dimensional particle simulation of the filamentation instability: Electrostatic field driven by the magnetic pressure gradient force
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 1070-664XFull text not available from this repository.
Official URL: http://dx.doi.org/10.1063/1.3160629
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|
|Number of Pages:||4|
|Page Range:||Article no. 074502|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||Queen's University Belfast, VetenskapsrAdet, DFG|
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