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Dissipative instability under weak beam–plasma coupling

Published online by Cambridge University Press:  07 March 2012

EDUARD V. ROSTOMYAN
EDUARD V. ROSTOMYAN*
Affiliation:
Institute of Radiophysics & Electronics, National Academy of Sciences of Armenia, Alikhanyan Str. 1, Ashtarak, 0203, Armenia ([email protected])
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Abstract

Beam–plasma interaction is investigated in a model of plasma microwave oscillator: waveguide with spatially separated plasma and beam layers of finite thicknesses. Investigation is carried out in general form without specifying shape of the waveguide in cross section. Approach is based on perturbation theory over wave coupling. Spatial separation implies weak beam–plasma interaction that exhibits many specific features. Developing instability is caused by the growth of the negative energy beam wave. It is shown that upon weak coupling presence, dissipation leads to a new type of dissipative beam instability. Its maximal growth rate is inversely proportional to collision frequency in plasma. The growth rate of this instability is obtained for an arbitrary level of dissipation. Basic parameters of instability show that its properties cannot be neglected upon design of high-power, high-frequency plasma-filled generators/amplifiers based on relativistic e-beams.

Type
Papers
Information
Journal of Plasma Physics , Volume 78 , Issue 5 , October 2012 , pp. 531 - 535
Copyright
Copyright © Cambridge University Press 2012

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