Wave mode instabilities in a two-stream free-electron laser with a background plasma

A theory is presented for a two-stream free-electron laser (FEL) with a background plasma. A dispersion relation (DR) for the unstable couplings of wave modes is derived using fluid formulation. This DR is solved numerically to find the unstable modes and their growth rate. The effect of the velocit...

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Bibliographic Details
Published inPlasma physics and controlled fusion Vol. 55; no. 2; pp. 25012 - 6
Main Authors Nadrifard, Shabnam, Maraghechi, B, Mohsenpour, T
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.02.2013
Subjects
Computational fluid dynamics
Controlled fusion
Couplings
Dispersion relation
Dispersions
Free electron lasers
Free-electron laser
Growth rate
Instability
Plasma (physics)
Self-fields
Stability
Two-stream instability
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Summary:A theory is presented for a two-stream free-electron laser (FEL) with a background plasma. A dispersion relation (DR) for the unstable couplings of wave modes is derived using fluid formulation. This DR is solved numerically to find the unstable modes and their growth rate. The effect of the velocity difference of the two electron beams as well as the background plasma on the FEL resonance and the two-stream instability is studied. It is shown that their separate as well as combined effects can increase the growth rates.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0741-3335
1361-6587
DOI:10.1088/0741-3335/55/2/025012