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On the decay of a dipole pump wave to half-harmonics

Published online by Cambridge University Press:  13 March 2009

J. A. Heikkinen ,
T. J. H. Pättikangas  and
G. Devillers
J. A. Heikkinen
Affiliation:
Technical Research Centre of Finland, Nuclear Engineering Laboratory, P.O. Box 208, SF-02150 Espoo, Finland
T. J. H. Pättikangas
Affiliation:
Helsinki University of Technology, Department of Technical Physics, SF-02150 Espoo, Finland
G. Devillers
Affiliation:
JET Joint Undertaking, Abingdon, Oxfordshire 0X14 3EA, England
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Abstract

Starting from a three-wave interaction coefficient for a homogeneous Vlasov plasma, we show that the parametric decay to half-harmonics has zero growth rate if the wavenumber of the pump wave vanishes. Earlier proofs of this fact for electrostatic decay modes are thus extended for a general case. As a specific example, we study the decay of a fast magnetosonic wave to two slow waves.

Type
Research Article
Information
Journal of Plasma Physics , Volume 46 , Issue 2 , October 1991 , pp. 231 - 236
Copyright
Copyright © Cambridge University Press 1991

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