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Counterstreaming beams in magnetized Vlasov plasma
Department of Mathematics, Iowa State University, Ames, USA.
Department of Physics, University of Pisa, Pisa, Italy.
Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering. (Scientific Visualization)ORCID iD: 0000-0003-4055-0552
Department of Physics, University of Pisa, Pisa, Italy.
2019 (English)In: Pramana (Bangalore), ISSN 0304-4289, E-ISSN 0973-7111, Vol. 93, p. 1-10, article id 87Article in journal (Refereed) Published
Abstract [en]

In this paper, we investigate nonrelativistic, kinetic, linear phase of the filamentation instability when an external magnetic field is present in the direction of the counterstreaming electron beams using Vlasov simulations in 1D-3V space. We first investigate the growth rate of instability. In the linear growth regime, our results correspond to the previous conclusions that with the increase in strength of the ambient magnetic field, there is a suppression of instability. Interestingly, we established that at a critical / threshold magnetic field, Vlasov simulations and particle-in-cell (PIC) simulations differ in their instability behaviour. At this particular magnetic field, there is a complete suppression of the growth of instability in Vlasov results compared to PIC simulations, where a strong growth of instability is shown. It is believed that thermal noise in the PIC leads to the growth. However, Vlasov simulations show wave–wave coupling which stabilises the modes. In this work, our focus is to demonstrate the difference in this behaviour and to thoroughly analyse the spectra and wave generation for the same.

Place, publisher, year, edition, pages
Bangalore, India: Indian Academy of Sciences , 2019. Vol. 93, p. 1-10, article id 87
Keywords [en]
PIC simulation, Vlasov simulation, beam instability
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:liu:diva-160749DOI: 10.1007/s12043-019-1854-8ISI: 000491299100010OAI: oai:DiVA.org:liu-160749DiVA, id: diva2:1358021
Available from: 2019-10-06 Created: 2019-10-06 Last updated: 2019-11-05Bibliographically approved

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Dieckmann, Mark E

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