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Whistler and electron-cyclotron instabilities in a plasma duct

Published online by Cambridge University Press:  13 March 2009

Litty James ,
Lalita Jassal  and
V. K. Tripathi
Litty James
Affiliation:
Department of Physics, Indian Institute of Technology, Hauz khas, New Delhi 110 016, India
Lalita Jassal
Affiliation:
Department of Physics, Indian Institute of Technology, Hauz khas, New Delhi 110 016, India
V. K. Tripathi
Affiliation:
Department of Physics, Indian Institute of Technology, Hauz khas, New Delhi 110 016, India
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Abstract

A gyrating electron beam propagating through a planar plasma duct can excite a whistler wave or an electron-cyclotron wave, depending on the plasma- density profile of the duct and the energy of the beam. The gyrational motion of the electron beam supplies energy to the wave. In the case of a whistler wave the interaction occurs via coupling of the fast cyclotron beam mode (ω ≈ k2vb + ωc/γ0) to the electromagnetic whistler mode through the Weibel instability mechanism, whereas for an electron-cyclotron wave the coupling is through the negative-mass instability mechanism. It is seen that there exist two diflerent beam-energy regimes for excitation of these waves. The growth rate and the efficiency of conversion for both waves are calculated for typical parameters of a gyrotron and a large-orbit gyrotron.

Type
Research Article
Information
Journal of Plasma Physics , Volume 54 , Issue 1 , August 1995 , pp. 119 - 128
Copyright
Copyright © Cambridge University Press 1995

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References

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