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One-dimensional particle simulation of the filamentation instability: Electrostatic field driven by the magnetic pressure gradient force
Queen’s University Belfast. (Scientific Visualization)
CPP, Queen's University Belfast, UK.
CPP, Queen's University Belfast, UK.
Physics Department, Warwick University, UK.
2009 (English)In: Physics of Plasmas, ISSN 1070-664X, Vol. 16, no 7, 074502-1-074502-4 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
College Park, Maryland: American Institute of Physics , 2009. Vol. 16, no 7, 074502-1-074502-4 p.
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:liu:diva-50698DOI: 10.1063/1.3160629OAI: diva2:271934
Available from: 2009-10-13 Created: 2009-10-13 Last updated: 2010-06-14

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Dieckmann, Mark Eric
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