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

Autor:	Guo Bo Zhang, Yan Yun Ma, X. H. Yang, Fuyuan Wu, Yan Zhao Ke, Shi Jia Chen, Zhe Yi Ge
Rok vydání:	2020
Předmět:	Electron density Materials science Backscatter Physics::Optics Steady State theory Plasma Condensed Matter Physics Laser Atomic and Molecular Physics and Optics law.invention Brillouin zone Physics::Plasma Physics law Irradiation Stimulated raman Electrical and Electronic Engineering Atomic physics
Zdroj:	Laser and Particle Beams. 38:169-175
ISSN:	1469-803X 0263-0346
DOI:	10.1017/s0263034620000191
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f7e120a308b44531c8bae1310ff30223 https://doi.org/10.1017/s0263034620000191 Zobrazit plný text záznamu