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Effect of self-focusing on parametric back-scattering and absorptive instabilities in a plasma

Published online by Cambridge University Press:  13 March 2009

M. S. Sodha ,
S. C. Kaushik  and
R. P. Sharma
M. S. Sodha
Affiliation:
Department of Electrical Engineering, Drexel University, Philadelphia 19104, U.S.A.
S. C. Kaushik
Affiliation:
Physics Department, Indian Institute of Technology, New Delhi-110029, India
R. P. Sharma
Affiliation:
Physics Department, Indian Institute of Technology, New Delhi-110029, India
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Abstract

This paper presents an investigation of the effect of self-focusing on the absolute growth rates of parametric back-scattering (e.g. stimulated Raman and Brillouin scatterings) and absorptive instabilities (e.g. two-plasmon decay and ion–plasmon decay) in a homogeneous and collisionless plasma. Gaussian intensity distribution of the pump laser beam causes the redistribution of carriers in the plane transverse to the beam propagation on account of the ponderomotive force, and leads the beam to propagate in an oscillatory wave guide mode. The modifications in plasma frequency and intensity of the beam cause the growth rates of the above parametric instabilities to show an oscillatory behaviour with the distance of propagation.

Type
Research Article
Information
Journal of Plasma Physics , Volume 18 , Issue 3 , December 1977 , pp. 551 - 561
Copyright
Copyright © Cambridge University Press 1977

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References

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