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Relativistic self-focusing in the interaction of laser beam and plasma with periodical density ripple

Published online by Cambridge University Press:  14 October 2020

Geng Zhang Open the ORCID record for Geng Zhang [Opens in a new window] ,
Qiuqun Liang  and
Xiongping Xia Open the ORCID record for Xiongping Xia [Opens in a new window]
Geng Zhang
Affiliation:
College of Science, Guilin University of Technology, Guilin541004, China
Qiuqun Liang
Affiliation:
College of Science, Guilin University of Technology, Guilin541004, China
Xiongping Xia*
Affiliation:
College of Science, Guilin University of Technology, Guilin541004, China
*
Author for correspondence: X. Xia, College of Science, Guilin University of Technology, Guilin 541004, China. E-mail: [email protected]
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Abstract

In the paper, relativistic self-focusing in the interaction of laser beam and plasma with periodical density ripple has been studied by the applied WKB approximation and higher-order paraxial theory. The result shows that under the influence of relativistic nonlinear effect, the dielectric function shows the fierce oscillational variation with similar periodicity, which then leads to the intense relativistic beam self-focusing along the propagation distance, such self-focusing also presents similar periodic variation. Besides, in the plasma with periodical density ripple, the initial density and the density ripple amplitude have obvious influence on self-focusing. When the two factors increase, then there will be more strength self-focusing. Choosing the appropriate initial density and the periodic density parameter is benefit to the formation of the more stable self-focusing.

Keywords

High-order paraxial theoryperiodical density ripplerelativistic nonlinearityself-focusingWKB approximation
Type
Research Article
Information
Laser and Particle Beams , Volume 38 , Issue 4 , December 2020 , pp. 244 - 250
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Copyright
Copyright © The Author(s) 2020. Published by Cambridge University Press

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