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Diocotron instability of a warm electron beam in crossed fields

Published online by Cambridge University Press:  13 March 2009

Hee J. Lee  and
Kwang-Sup Yang
Hee J. Lee
Affiliation:
Department of Physics, Hanyang University, Seoul 133–791, Korea
Kwang-Sup Yang
Affiliation:
Department of Physics, Hanyang University, Seoul 133–791, Korea
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Abstract

The warm-fluid equation derived from the drift kinetic equation is solved numerically to investigate the electrostatic low-frequency stability of an electron ribbon beam drifting in the crossed-fields of a planar magnetron. The temperature effect is manifested only for oblique propagation with respect to the drifting beam direction. The dispersion relation takes the form ω = ω(k⊥/ks∥) = ω(ks∥/k⊥), where k⊥ and k⊥ are respectively the components of the surface wave vector k parallel and perpendicular to the magnetic field. The obliqueness of the propagation direction and the non-zero temperature give rise to a resonant instability, in addition to the diocotron instability, and the wavenumber corresponding to the maximum diocotron growth rate shifts as the temperature changes.

Type
Research Article
Information
Journal of Plasma Physics , Volume 55 , Issue 1 , February 1996 , pp. 131 - 142
Copyright
Copyright © Cambridge University Press 1996

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