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Magnetic field effe...
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Bret, AntoineETSI Ind Univ Castilla-La Mancha
(author)
Magnetic field effects on instabilities driven by a field-aligned relativistic warm electron beam and warm bulk electrons
- Article/chapterEnglish2007
Publisher, publication year, extent ...
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Warsaw :European Physical Society,2007
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:liu-38879
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https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-38879URI
Supplementary language notes
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Language:English
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Summary in:English
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Classification
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Subject category:ref swepub-contenttype
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Subject category:kon swepub-publicationtype
Notes
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Instabilities driven by relativistic electron beams are being investigated due to their importance for plasma heating and electromagnetic field generation in astrophysical and laboratory plasmas. Particle-in-cell (PIC) simulations of initially unmagnetized colliding plasmas have demonstrated the generation of strong magnetic fields and a moderate electron acceleration. The inclusion of a flow-aligned magnetic field suppresses the electromagnetic filamentation instability and PIC simulations have shown that the plasma dynamics turns quasi-electrostatic. To quantify the impact of the magnetic field, we have analyzed numerically a magnetized multi-fluid model that includes a kinetic pressure term. This fluid model allows us to examine the beam-driven instability at all angles between the wavevector and the magnetic field vector. More accurate kinetic models typically focus only on the filamentation instability, due to the increased analytical complexity. We present here the fluid model and a growth rate map of the entire k-space for a beam Lorentz factor 4. We verify that the two-stream, mixed mode and filamentation instability belong to the same wave branch and that the magnetic field selects the fastest-growing mode. We estimate the magnetic fields required to suppress the filamentation and the mixed mode instabilities.
Subject headings and genre
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plasma physics
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TECHNOLOGY
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TEKNIKVETENSKAP
Added entries (persons, corporate bodies, meetings, titles ...)
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Dieckmann, Mark E,1969-Linköpings universitet,Visuell informationsteknologi och applikationer,Tekniska högskolan(Swepub:liu)mardi06
(author)
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Deutsch, ClaudePhys Gas Plasma Lab Univ Paris 11, Orsay
(author)
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ETSI Ind Univ Castilla-La ManchaVisuell informationsteknologi och applikationer
(creator_code:org_t)
Related titles
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In:34th European Physical Society Conference on Plasma Physics,2007Warsaw : European Physical Society, s. P2.079-
Internet link
To the university's database