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One-dimensional steady-state model for stimulated Raman and Brillouin backscatter processes in laser-irradiated plasmas

Published online by Cambridge University Press:  16 July 2020

Zhe Yi Ge
Affiliation:
College of Liberal Arts and Science, National University of Defense Technology, Changsha410073, China
Guo Bo Zhang*
Affiliation:
College of Liberal Arts and Science, National University of Defense Technology, Changsha410073, China
Yan Zhao Ke
Affiliation:
College of Liberal Arts and Science, National University of Defense Technology, Changsha410073, China
Xiao Hu Yang
Affiliation:
College of Liberal Arts and Science, National University of Defense Technology, Changsha410073, China Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai200240, China
Fu Yuan Wu
Affiliation:
College of Liberal Arts and Science, National University of Defense Technology, Changsha410073, China
Shi Jia Chen
Affiliation:
College of Liberal Arts and Science, National University of Defense Technology, Changsha410073, China
Yan Yun Ma
Affiliation:
College of Liberal Arts and Science, National University of Defense Technology, Changsha410073, China Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai200240, China
*
Author for correspondence: G.B. Zhang, National University of Defense Technology, Changsha410074, China. E-mail: zgb830@163.com

Abstract

A one-dimensional steady-state model for stimulated Raman backscatter (SRS) and stimulated Brillouin backscatter (SBS) processes in laser-irradiated plasmas is presented. Based on a novel “predictor-corrector” method, the model is capable to deal with broadband scattered light and inhomogeneous plasmas, exhibiting robustness and high efficiency. Influences of the electron density and temperature on the linear gains of both SRS and SBS are investigated, which indicates that the SRS gain is more sensitive to the electron density and temperature than that of the SBS. For the low-density case, the SBS dominates the scattering process, while the SRS exhibits much higher reflectivity in the high-density case. The nonlinear saturation mechanisms and competition between SRS and SBS are included in our model by a phenomenological method. The typical anti-correlation between SRS and SBS versus electron density is reproduced in the model. Calculations of the reflectivities are qualitatively in agreement with the typical results of experiments and simulations.

Type
Research Article
Copyright
Copyright © The Author(s) 2020. Published by Cambridge University Press

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