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Impact of the electron to ion mass ratio on unstable systems in particle-in-cell simulations
University of Bordeaux, Centre Lasers Intenses et Applications, CNRS, CEA, UMR 5107, Talence, France.
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten. (Scientific Visualization)ORCID-id: 0000-0003-4055-0552
University of Bordeaux, Centre Lasers Intenses et Applications, CNRS, CEA, UMR 5107, Talence, France.
University of Bordeaux, Centre Lasers Intenses et Applications, CNRS, CEA, UMR 5107, Talence, France.
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2018 (engelsk)Inngår i: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 25, nr 6, artikkel-id 062125Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The evolution of the Buneman and two-stream instabilities driven by a cold dilute mildly relativistic electron beam is studied as a function of the ion-to-electron mass ratio. The growth rates of both instabilities are comparable for the selected parameters if the realistic ion-to-electron mass ratio is used and the Buneman instability outgrows the two-stream instability for an artificially reduced mass ratio. Particle-in-cell simulations show that both instabilities grow independently during their linear growth phase. The much lower saturation amplitude of the Buneman instability implies that it saturates first even if the linear growth rates of both instabilities are equal. The electron phase space holes it drives coalesce. Their spatial size increases in time and they start interacting with the two-stream mode, which results in the growth of electrostatic waves over a broad range of wave numbers. A reduced ion-to-electron mass ratio results in increased ion heating and in an increased energy loss of the relativistic electron beam compared to that in a simulation with the correct mass ratio.

sted, utgiver, år, opplag, sider
American Institute of Physics (AIP), 2018. Vol. 25, nr 6, artikkel-id 062125
Emneord [en]
PIC simulation, beam instability
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-149657DOI: 10.1063/1.5027913ISI: 000437193700039Scopus ID: 2-s2.0-85049080685OAI: oai:DiVA.org:liu-149657DiVA, id: diva2:1233114
Tilgjengelig fra: 2018-07-16 Laget: 2018-07-16 Sist oppdatert: 2018-08-28bibliografisk kontrollert

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