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Kinetics of the Raman scattering in a laser corona using a transform method

Published online by Cambridge University Press:  06 November 2017

M. Mašek  and
K. Rohlena
M. Mašek*
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Rep., Na Slovance 2, 182 21 Prague 8, Czech Republic
K. Rohlena
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Rep., Na Slovance 2, 182 21 Prague 8, Czech Republic
*
Address correspondence and reprint requests to: M. Mašek, Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic. E-mail: [email protected]
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Abstract

This paper is an extension of our previous paper (Mašek and Rohlena, 2015), where we applied a transform method for the solution of Vlasov–Maxwell set of equations in a one-dimensional geometry to describe the Raman backscattering of the heating ns laser wave in the external corona of the generated laser plasma in a strongly non-linear regime. The method is stabilized by a simplified Fokker–Planck collision term, which, in turn, is used for a study of the influence of collisional and collisionless damping mechanisms of the daughter electron plasma wave (EPW) on the instability development and their competition resulting in a different instability behavior in various plasma configurations. The physics of trapped electrons is studied in detail and compared to the resulting Raman reflectivity. The Raman reflectivity was found to depend strongly on the intensity of laser irradiation in the different regions of the plasma corona. This is discussed in detail from the point of view of trapped electrons behavior in the EPW. Moreover, a study of the Raman reflectivity dependence on the electron–ion collision frequency (average plasma ionization) is presented, too. The results supplement the physical picture of the collision and collisionless processes influencing the Raman instability non-linear development.

Keywords

Stimulated Raman scatteringTransform methodVlasov equation
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 4 , December 2017 , pp. 687 - 698
Copyright
Copyright © Cambridge University Press 2017 

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