Plasma-induced efficiency enhancement in a backward wave oscillator

The microwave generation from a vacuum backward-wave oscillator is simulated. The phase velocity of the most unstable mode is reduced to enhance efficiency. The results suggest that the relatively weak beam- backward plasma-wave instability introduced by the rippled waveguide wall exerts minimal imp...

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Bibliographic Details
Published in:Physical review letters 1989-12, Vol.63 (26), p.2808-2811
Main Authors: Lin, AT, Chen, L
Format: Article
Language:English
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Summary:The microwave generation from a vacuum backward-wave oscillator is simulated. The phase velocity of the most unstable mode is reduced to enhance efficiency. The results suggest that the relatively weak beam- backward plasma-wave instability introduced by the rippled waveguide wall exerts minimal impact on the interaction efficiency. It is found that a dense background plasma tends to reduce the phase velocity of the most unstable backward-wave oscillator mode and causes electrons to give up more energy to the wave. (R.B.)
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.63.2808