One-dimensional particle simulation of the filamentation instability: Electrostatic field driven by the magnetic pressure gradient force
2009 (English)In: Physics of Plasmas, ISSN 1070-664X, Vol. 16, no 7, 074502-1-074502-4 p.Article in journal (Refereed) Published
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.
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:liu:diva-50698DOI: 10.1063/1.3160629OAI: oai:DiVA.org:liu-50698DiVA: diva2:271934