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Simulation study of the filamentation of counter-streaming beams of the electrons and positrons in plasmas
Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology.ORCID iD: 0000-0003-4055-0552
Ruhr University Bochum.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics . Linköping University, The Institute of Technology.
2009 (English)In: PLASMA PHYSICS AND CONTROLLED FUSION, ISSN 0741-3335, Vol. 51, no 6, 065015- p.Article in journal (Refereed) Published
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
2009. Vol. 51, no 6, 065015- p.
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Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-18901DOI: 10.1088/0741-3335/51/6/065015OAI: oai:DiVA.org:liu-18901DiVA: diva2:222100
Note
Original Publication: Mark E Dieckmann, P K Shukla and Lennart Stenflo, Simulation study of the filamentation of counter-streaming beams of the electrons and positrons in plasmas, 2009, PLASMA PHYSICS AND CONTROLLED FUSION, (51), 6, 065015. http://dx.doi.org/10.1088/0741-3335/51/6/065015 Copyright: Institute of Physics Publishing http://www.iop.org/ Available from: 2009-06-22 Created: 2009-06-05 Last updated: 2017-11-03Bibliographically approved

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Dieckmann, Mark EStenflo, Lennart

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