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Proposal of a new principle of cyclotron emission from neutralized electron beams

Published online by Cambridge University Press:  01 August 2007

KAZUO MINAMI ,
YADUVENDRA CHOYAL  and
TSUGUHIRO WATANABE
KAZUO MINAMI
Affiliation:
Faculty of Engineering, Tokyo Denki University, Chiyoda-Ku, Tokyo 101-8457, Japan (kminami@msa.biglobe.ne.jp)
YADUVENDRA CHOYAL
Affiliation:
School of Physics, Devi Ahilya University, Indore 452 017, India
TSUGUHIRO WATANABE
Affiliation:
Professor Emeritus, National Institute for Fusion Science, Toki City 509-5292, Japan
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Abstract

Radiation from a loosely constrained cyclotron motion of mono-energetic electrons on a common large orbit (LO) circle in a uniform axial magnetic field and in a right-hand circularly polarized field of plane electromagnetic waves has been studied numerically by particle simulation. A restoring force caused by neutralizing ions against the displacements of gyrating electrons from the original LO circle is introduced by a phenomenological potential well in the radial direction. It is shown that, in high-density beams such as ωb2 ≫~Ω2, Cherenkov instability in the azimuthal direction with ω <~ω+Vzkz leads to the excitation of microwaves. Here, ωb, ~ω, ω, Vz and kz are, respectively, relativistic beam plasma frequency, relativistic electron cyclotron frequency, oscillation angular frequency, axial component of beam velocity and axial wavenumber.

Type
Papers
Information
Journal of Plasma Physics , Volume 73 , Issue 4 , August 2007 , pp. 523 - 541
Copyright
Copyright © Cambridge University Press 2006

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