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Enhanced Raman Scattering of Elliptical Laser Beam in a Collisionless Plasma

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Abstract

This paper presents the Enhanced Raman scattering of a elliptical laser beam in a collisionless plasma. The transverse intensity gradient of a pump beam generates a Ponderomotive force, which modifies the background plasma density profile in a direction transverse to pump beam axis. This modification in density effects the incident laser beam, plasma wave and back-scattered beam. Non-linear differential equations for the beam width parameters of pump laser beam, plasma wave and back-scattered beam are set up and solved numerically. The interplay between the self-focusing of the main beam and SRS has been studied in detail. The analysis clearly shows a coupling between the main beam and the plasma wave, therefore an increase in the self-focusing of the pump beam at lower intensities increases the self-focusing of the plasma wave which inturn leads to an increase in the back-reflectivity of the scattered wave. Further, it is also predicted that strong self-focusing of the pump beam at higher plasma density leads to strong self-focusing of the plasma wave and results in an increase in SRS reflectivity.

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Acknowledgments

The authors would like to thank Ministry of Human Resources and Development of India for the support of this work.

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Authors and Affiliations

  1. Department of Physics, National Institute of Technology, Jalandhar, India

    Arvinder Singh & Keshav Walia

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  1. Arvinder Singh
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  2. Keshav Walia
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Correspondence to Arvinder Singh.

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Singh, A., Walia, K. Enhanced Raman Scattering of Elliptical Laser Beam in a Collisionless Plasma. J Fusion Energ 31, 21–29 (2012). https://doi.org/10.1007/s10894-011-9413-4

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  • DOI: https://doi.org/10.1007/s10894-011-9413-4

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