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Raman gain against a background of non-thermal ion fluctuations in a plasma

Published online by Cambridge University Press:  23 July 2001

H. C. BARR ,
T. J. M. BOYD  and
A. V. LUKYANOV
H. C. BARR
Affiliation:
Physics Department, University of York, York YO10 5DD, UK
T. J. M. BOYD
Affiliation:
Physics Department, University of Essex, Colchester CO4 3SQ, UK
A. V. LUKYANOV
Affiliation:
MIS, University of Coventry, Priory Street, Coventry CV1 5FB, UK
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A complex stimulated Raman scattering event against a background of non-thermal ion acoustic waves in an inhomogeneous plasma is described. We obtain analytic forms for the Raman gain due to a five-wave interaction consisting of conventional three-wave Raman scattering followed by the decay of the Raman Langmuir wave into a second Langmuir wave (or a second scattered light wave) and an ion acoustic wave. Very modest levels of ion waves produce a significant effect on Raman convective gain. A combination of plasma inhomogeneity and suprathermal ion fluctuations may offer a means for the control of Raman gain.

Type
Research Article
Information
Journal of Plasma Physics , Volume 64 , Issue 5 , November 2000 , pp. 623 - 630
Copyright
© 2000 Cambridge University Press