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Relativistic electron beam driven instabilities in the presence of an arbitrarily oriented magnetic field
ETSI Industriales Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain.
Linköpings universitet, Institutionen för teknik och naturvetenskap, Visuell informationsteknologi och applikationer. Linköpings universitet, Tekniska högskolan.ORCID-id: 0000-0003-4055-0552
2008 (engelsk)Inngår i: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 15, nr 6, s. 062102-1-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The electromagnetic instabilities driven by a relativistic electron beam, which moves through a magnetized plasma, are analyzed with a cold two-fluid model. It allows for any angle B between the beam velocity vector and the magnetic field vector and considers any orientation of the wavevector in the two-dimensional plane spanned by these two vectors. If the magnetic field is strong, the two-stream instability dominates if B=0 and the oblique modes grow faster at larger B. A weaker magnetic field replaces the two-stream modes with oblique modes as the fastest-growing waves. The threshold value separating both magnetic regimes is estimated. A further dimensionless parameter is identified, which determines whether or not the wavevector of the most unstable wave is changed continuously, as B is varied from 0 to /2. The fastest growing modes are always found for a transverse propagation of the beam with B=/2, irrespective of the magnetic field strength. ©2008 American Institute of Physics

sted, utgiver, år, opplag, sider
2008. Vol. 15, nr 6, s. 062102-1-
Emneord [en]
plasma physics
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-42496DOI: 10.1063/1.2926634Lokal ID: 65120OAI: oai:DiVA.org:liu-42496DiVA, id: diva2:263353
Tilgjengelig fra: 2009-10-10 Laget: 2009-10-10 Sist oppdatert: 2017-12-13

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