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How large can the electron to proton mass ratio be in particle-in-cell simulations of unstable systems?
Universidad de Castilla-La Mancha, Spain. (ETSI Industriales)
Linköpings universitet, Institutionen för teknik och naturvetenskap, Visuell informationsteknologi och applikationer. Linköpings universitet, Tekniska högskolan.ORCID-id: 0000-0003-4055-0552
2010 (engelsk)Inngår i: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 17, nr 3, s. 032109-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Particle-in-cell simulations are widely used as a tool to investigate instabilities that develop between a collisionless plasma and beams of charged particles. However, even on contemporary supercomputers, it is not always possible to resolve the ion dynamics in more than one spatial dimension with such simulations. The ion mass is thus reduced below 1836 electron masses, which can affect the plasma dynamics during the initial exponential growth phase of the instability and during the subsequent nonlinear saturation. The goal of this article is to assess how far the electron to ion mass ratio can be increased, without changing qualitatively the physics. It is first demonstrated that there can be no exact similarity law, which balances a change in the mass ratio with that of another plasma parameter, leaving the physics unchanged. Restricting then the analysis to the linear phase, a criterion allowing to define a maximum ratio is explicated in terms of the hierarchy of the linear unstable modes. The criterion is applied to the case of a relativistic electron beam crossing an unmagnetized electron-ion plasma.

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American Institute of Physics , 2010. Vol. 17, nr 3, s. 032109-
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URN: urn:nbn:se:liu:diva-54417DOI: 10.1063/1.3357336ISI: 000276210100010OAI: oai:DiVA.org:liu-54417DiVA, id: diva2:303563
Merknad
Original Publication: Antoine Bret and Mark Eric Dieckmann, How large can the electron to proton mass ratio be in particle-in-cell simulations of unstable systems?, 2010, Physics of Plasmas, (17), 3, 032109. http://dx.doi.org/10.1063/1.3357336 Copyright: American Institute of Physics http://www.aip.org/ Tilgjengelig fra: 2010-03-13 Laget: 2010-03-13 Sist oppdatert: 2017-12-12

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