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Simulation study of the filamentation of counter-streaming beams of the electrons and positrons in plasmas
Umeå University, Faculty of Science and Technology, Department of Physics. Institute of Theoretical Physics IV, Ruhr-University Bochum, D-44780 Bochum, Germany; SUPA Department of Physics, University of Strathclyde, Glasgow, Scotland.
2009 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 51, no 6, 065015Article in journal (Refereed) PublishedText
Abstract [en]

The filamentation instability (FI) driven by two spatially uniform and counter-streaming beams of charged particles in plasmas is modelled by a particle-in-cell simulation. Each beam consists of electrons and positrons. The four species are equally dense and have the same temperature. The one-dimensional simulation direction is orthogonal to the beam velocity vector. The magnetic field grows spontaneously and rearranges the particles in space, such that the distributions of the electrons of one beam and the positrons of the second beam match. The simulation demonstrates that as a result no electrostatic field is generated by the magnetic field through its magnetic pressure gradient prior to its saturation. This electrostatic field would be repulsive at the centres of the filaments and limit the maximum charge and current density. The filaments of electrons and positrons in this simulation reach higher charge and current densities than in one with no positrons. The oscillations of the magnetic field strength induced by the magnetically trapped particles result in an oscillatory magnetic pressure gradient force. The latter interplays with the statistical fluctuations in the particle density and it probably enforces a charge separation, by which electrostatic waves grow after the FI has saturated.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2009. Vol. 51, no 6, 065015
Keyword [en]
magnetic-field generation, relativistic pair plasma, Weibel instability, electromagnetic instabilities, evolution, shocks, codes
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:umu:diva-116002DOI: 10.1088/0741-3335/51/6/065015ISI: 000266218300016OAI: diva2:905762
Available from: 2016-02-23 Created: 2016-02-08 Last updated: 2016-02-23Bibliographically approved

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Shukla, Padma Kant
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