Spatiotemporal Evolution of Stimulated Raman Scattering in the Absolute and Convective Regimes

Spatiotemporal Evolution of Stimulated Raman Scattering in the Absolute and Convective Regimes
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绝对和对流状态下受激拉曼散射的时空演化

DOI:
10.1088/1009-0630/15/8/01
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发表时间:
2013-08
影响因子:
1.7
通讯作者:
C.Y. Zheng
C.Y. Zheng
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
W. Feng;X.B. Li;C.Y. Zheng

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利用三波相互作用(3WI)程序研究了绝对和对流两种情况下的受激拉曼散射(SRS)。在模拟中,等离子体波的时间和空间演化分别由时间增长率和空间因子来描述。研究了不同阶段和不同不稳定区域的空间因素。研究发现,空间因子是由第一相位的有限泵浦波速度和最后相位的阻尼引起的。随着空间因子的加入,时间增长率降低,有限频率失配的SRS阈值增加。同时,还讨论了波频失配对时间增长率的影响。
A three-wave interaction (3WI) code is developed to study the stimulated Raman scattering (SRS) in both absolute and convective regimes. In the simulations, the time and spatial evolutions of a plasma wave are described by temporal growth rate and spatial factor, respectively. The spatial factors in different phases and different instability regimes are investigated. It is found that the spatial factor is caused by the finite velocity of the pump wave in the first phase and by damping in the last phase. With inclusion of the spatial factor, the temporal growth rate decreases and the threshold for SRS for a finite frequency mismatch increases. Meanwhile, the effects of wave frequency mismatch on the temporal growth rate are also discussed.
DOI: 10.1063/1.2811121
发表时间: 2019-05
期刊: --
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