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Whistler wave emission by a modulated electron beam injected into a plasma column surrounded by a uniform medium

Published online by Cambridge University Press:  01 December 2007

C. KRAFFT  and
T. M. ZABORONKOVA
C. KRAFFT
Affiliation:
Laboratoire de Physique et Technologie des Plasmas, Ecole Polytechnique, 91128 Palaiseau Cedex, France
T. M. ZABORONKOVA
Affiliation:
Department of Applied Physics, Technical University of Nizhny Novgorod, 24 Minin Street, Nizhny Novgorod 603950, Russia
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Abstract

The efficiency of whistler wave radiation by a density modulated and thin electron beam of finite length injected parallel with respect to the constant ambient magnetic field into a cylindrical plasma column surrounded by a uniform isotropic medium and aligned along the magnetic field is studied. A rigorous analytical derivation of the wave fields excited by the beam in the plasma column is presented. The time-averaged power radiated by the beam at the modulation frequency is determined. In particular, numerical calculations performed for physical conditions relevant to laboratory magnetized discharge plasmas show that, in the presence of a plasma column, the power lost by the modulated beam can be efficiently enhanced owing to resonant Cherenkov excitation of guided whistler modes at the beam modulation frequency.

Type
Papers
Information
Journal of Plasma Physics , Volume 73 , Issue 6 , December 2007 , pp. 967 - 980
Copyright
Copyright © Cambridge University Press 2007

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