Revisit of electron temperature effect on stimulated Brillouin scattering in homogenous plasma

Author:

Liu Z.12ORCID,Weng S. M.12ORCID,Ma H. H.123ORCID,Yew S. H.12ORCID,Li X. F.4ORCID,Jiang X. Y.12ORCID,Zhou H. Y.5ORCID,Sheng Z. M.123ORCID

Affiliation:

1. Key Laboratory for Laser Plasmas (MOE), School of Physics and Astronomy, Shanghai Jiao Tong University 1 , Shanghai 200240, China

2. Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University 2 , Shanghai 200240, China

3. Tsung-Dao Lee Institute, Shanghai Jiao Tong University 3 , Shanghai 200240, China

4. State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences 4 , Shanghai 201800, China

5. Department of Physics, National University of Defense Technology 5 , Changsha 410073, China

Abstract

Stimulated Brillouin scattering (SBS) has complex dependence on the plasma electron temperature via the Landau damping, particle trapping, and consequent nonlinear frequency shift. It is found from our numerical simulation that the SBS reflectivity in its saturation stage tends to increase with the plasma electron temperature within a certain range, although the linear growth rate of SBS normally reduces with the increasing electron temperature. This is because the phase velocity of an ion acoustic wave (IAW) increases with the electron temperature, which tends to reduce the Landau damping of the IAWs and hence reduce ion trapping. In the nonlinear saturation stage, ion trapping will modify the ion distribution function and induce a negative frequency shift in the IAW. This nonlinear frequency shift will break the three-wave coupling, thereby causing saturation of the SBS. With further increase in the electron temperature, however, electron trapping will dominate over ion trapping, which induces a positive frequency shift in the IAW and can lead to the SBS saturation as well. As a result, the SBS reflectivity first increases and then decreases with increase in the electron temperature. At around the peak of the SBS reflectivity, the positive frequency shift of IAW induced by electron trapping roughly offsets the negative frequency shift induced by ion trapping.

Funder

Strategic Priority Research Program of Chinese Academy of Sciences

National Natural Science Foundation of China

Publisher

AIP Publishing

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