High Power Laser Science and Engineering, 2019, 7 (4): 04000e58, Published Online: Nov. 6, 2019
Burst behavior due to the quasimode excited by stimulated Brillouin scattering in high-intensity laser–plasma interactions 
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Fig. 1. Contours of solutions to the dispersion relations of (a) the fast IAW mode and the slow IAW mode without pump light and (b) the quasimode with strong pump light $I_{0}=1\times 10^{16}~\text{W}/\text{cm}^{2}$ . The red line is $\text{Re}[\unicode[STIX]{x1D716}]=0$ and the blue line is $\text{Im}[\unicode[STIX]{x1D716}]=0$ . The conditions are $T_{e}=5~\text{keV}$ , $T_{i}=0.2T_{e}$ , $n_{e}=0.3n_{c}$ and $k_{A}\unicode[STIX]{x1D706}_{De}=0.3$ in a $\text{C}_{2}\text{H}$ plasma.
Fig. 2. Frequency spectrum of $E_{y}$ with the time range $t\in [0,1\times 10^{5}]\unicode[STIX]{x1D714}_{0}^{-1}$ at $x_{0}=25c/\unicode[STIX]{x1D714}_{0}$ . The parameters are $n_{e}=0.3n_{c},T_{e}=5~\text{keV},T_{i}=0.2T_{e}$ and $I_{0}=1\times 10^{16}~\text{W}/\text{cm}^{2}$ in a $\text{C}_{2}\text{H}$ plasma, the same as in Figure 1 (b).
Fig. 3. (a) Evolution of the SBS reflectivities of different modes with time, where SBS is the total SBS with the frequency range $\unicode[STIX]{x1D714}\in [0.9\unicode[STIX]{x1D714}_{0},0.999\unicode[STIX]{x1D714}_{0}]$ , SBS of the fast mode with range $\unicode[STIX]{x1D714}\in [0.9968\unicode[STIX]{x1D714}_{0},0.9977\unicode[STIX]{x1D714}_{0}]$ and SBS of the quasimode with range $\unicode[STIX]{x1D714}\in [0.9960\unicode[STIX]{x1D714}_{0},0.9968\unicode[STIX]{x1D714}_{0}]$ . (b) Reflectivity and transmissivity of the total SBS. The condition is the same as in Figure 2 .
Fig. 5. (a) Early linear stage of SBS in different species plasmas. (b) Relation between the SBS reflectivity and SBS gain in different species plasmas, where the gains in multi-ion species plasmas, such as CH and $\text{C}_{2}\text{H}$ plasmas, are calculated by the kinetic theory, and the gains in single-ion species plasmas, such as H and C plasmas, are calculated by the fluid theory. The SBS reflectivities by the Vlasov simulation take the values at $t=1.3\times 10^{4}\unicode[STIX]{x1D714}_{0}^{-1}$ .
Table1. Frequencies of different modes and the corresponding scattered light. The conditions are $T_{e}=5~\text{keV}$ $T_{i}=0.2T_{e}$ $n_{e}=0.3n_{c}$ $k_{A}\unicode[STIX]{x1D706}_{De}=0.3$ $I_{0}=1\times 10^{16}~\text{W}/\text{cm}^{2}$ $\text{C}_{2}\text{H}$
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Q. S. Feng, L. H. Cao, Z. J. Liu, C. Y. Zheng, X. T. He. Burst behavior due to the quasimode excited by stimulated Brillouin scattering in high-intensity laser–plasma interactions[J]. High Power Laser Science and Engineering, 2019, 7(4): 04000e58.
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