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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)ORCID-id: 0000-0003-4055-0552
CPP, Queen's University Belfast, UK.
CPP, Queen's University Belfast, UK.
Physics Department, Warwick University, UK.
2009 (engelsk)Inngår i: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 16, nr 7, s. 074502-1-074502-4Artikkel i tidsskrift (Fagfellevurdert) 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.

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College Park, Maryland: American Institute of Physics , 2009. Vol. 16, nr 7, s. 074502-1-074502-4
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URN: urn:nbn:se:liu:diva-50698DOI: 10.1063/1.3160629OAI: oai:DiVA.org:liu-50698DiVA, id: diva2:271934
Tilgjengelig fra: 2009-10-13 Laget: 2009-10-13 Sist oppdatert: 2017-12-12

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