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

FENG Wu (冯武); LI Xibo (李希波); ZHENG Chunyang (郑春阳)

doi:10.1088/1009-0630/15/8/01

Plasma Science and Technology > 2013 > 15(8): 721-726. > DOI: 10.1088/1009-0630/15/8/01

FENG Wu (冯武), LI Xibo (李希波), ZHENG Chunyang (郑春阳). Spatiotemporal Evolution of Stimulated Raman Scattering in the Absolute and Convective Regimes¤[J]. Plasma Science and Technology, 2013, 15(8): 721-726. DOI: 10.1088/1009-0630/15/8/01

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

1 The Graduate School of China Academy of Engineering Physics, Beijing 100088, China 2 China University of Mining and Technology (Beijing), Beijing 100083, China 3 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China 4 Center for Applied Physics and Technology, Peking University, Beijing 100871, China

Funds: supported by Sci. & Tech. Funds of CAEP (Nos. 2010A0102004 and 2010B0102018), and National Natural Science Foundation of China (Nos. 11075025, 10975023, 10935003, 10835003)

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Received Date: March 23, 2012

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Abstract

Abstract

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 di?erent phases and di?erent instability regimes are investigated. It is found that the spatial factor is caused by the ˉnite velocity of the pump wave in the ˉrst 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 ˉnite frequency mismatch increases. Meanwhile, the e?ects of wave frequency mismatch on the temporal growth rate are also discussed.
- SRS,
- absolute and convective instability,
- temporal growth rate,
- spatial factor,
- frequency mismatch

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