Simulation study of the filamentation of counter-streaming beams of the electrons and positrons in plasmas

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Dieckmann, Mark E,1969-Linköpings universitet,Visuell informationsteknologi och applikationer,Tekniska högskolan (författare)

Simulation study of the filamentation of counter-streaming beams of the electrons and positrons in plasmas

Artikel/kapitelEngelska2009

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2009-04-30
Institute of Physics Publishing (IOPP),2009
printrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:umu-116002
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-116002URI
https://doi.org/10.1088/0741-3335/51/6/065015DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-18901URI

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Språk:engelska
Sammanfattning på:engelska

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Anmärkningar

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/
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.

Ämnesord och genrebeteckningar

NATURVETENSKAP Fysik Fusion, plasma och rymdfysik hsv//swe
NATURAL SCIENCES Physical Sciences Fusion, Plasma and Space Physics hsv//eng
magnetic-field generation
relativistic pair plasma
Weibel instability
electromagnetic instabilities
evolution
shocks
codes
NATURAL SCIENCES

Biuppslag (personer, institutioner, konferenser, titlar ...)

Shukla, Padma KantUmeå universitet,Institutionen för fysik,Institute of Theoretical Physics IV, Ruhr-University Bochum, D-44780 Bochum, Germany; SUPA Department of Physics, University of Strathclyde, Glasgow, Scotland(Swepub:umu)pash0006 (författare)
Stenflo, LennartLinköpings universitet,Teoretisk Fysik,Tekniska högskolan(Swepub:liu)lenst65 (författare)
Linköpings universitetVisuell informationsteknologi och applikationer (creator_code:org_t)

Sammanhörande titlar

Ingår i:Plasma Physics and Controlled Fusion: Institute of Physics Publishing (IOPP)51:60741-33351361-6587

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Av författaren/redakt...: Dieckmann, Mark ...; Shukla, Padma Ka ...; Stenflo, Lennart

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NATURVETENSKAP: NATURVETENSKAP; och Fysik; och Fusion plasma oc ...

Artiklar i publikationen: Plasma Physics a ...

Av lärosätet: Umeå universitet; Linköpings universitet

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