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国家自然科学基金(10835003)

作品数:5 被引量:31H指数:1
相关作者:朱少平裴文兵更多>>
相关机构:北京应用物理与计算数学研究所更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划国家高技术研究发展计划更多>>
相关领域:理学机械工程核科学技术电子电信更多>>

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Spatiotemporal Evolution of Stimulated Raman Scattering in the Absolute and Convective Regimes
2013年
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.
冯武李希波郑春阳
关键词:SRS
Preliminary experimental study and simulation of an energy-tunable quasi-monochromatic laser-Compton X/γ-ray source
2012年
We propose a slanting collision scheme for Compton scattering of a laser light against a relativistic electron beam. This scheme is suitable to generate an energy-tunable X/γ-ray source. In this paper, we present theoretical study and simulation of the spectral, spatial and temporal characteristics of such a source. We also describe two terms laser-Compton scattering (LCS) experiments at the 100 MeV Linac of Shanghai Institute of Applied Physics, where quasi-monochromatic LCS X-ray energy spectra with peak energies of ~ 30 keV are observed successfully. These preliminary investigations are carried out to understand the feasibility of developing an energy-tunable quasi-monochromatic X/γ-ray source, the future Shanghai Laser Electron Gamma Source.
罗文徐望卓红斌马燕司
关键词:LCS
Bursting behaviours in cascaded stimulated Brillouin scattering
2012年
Stimulated Brillouin scattering is studied by numerically solving the Vlasov Maxwell system. A cascade of stim- ulated Brillouin scattering can occur when a linearly polarized laser pulse propagates in a plasma. It is found that a stimulated Brillouin scattering cascade can reduce the scattering and increase the transmission of light, as well as intro- duce a bursting behaviour in the evolution of the laser-plasma interaction. The bursting time in the reflectivity is found to be less than half the ion acoustic period. The ion temperature can affect the stimulated Brillouin scattering cascade, which can repeat several times at low ion temperatures and can be completely eliminated at high ion temperatures. For stimulated Brillouin scattering saturation, higher-harmonic generation and wave wave interaction of the excited ion acoustic waves can restrict the amplitude of the latter. In addition, stimulated Brillouin scattering cascade can restrict. the amplitude of the scattered light.
Liu Zhan-JunHe Xian-TuZheng Chun-YangWang Yu-Gang
关键词:CASCADE
激光聚变中的科学计算被引量:31
2009年
科学计算在激光聚变研究中发挥着重要的作用.经过长期的努力,中国已形成了以LARED系列程序为核心的分段模拟激光聚变主要环节和关键问题的二维数值模拟能力.文章首先介绍了激光聚变的主要物理过程、主要物理过程的特征以及对科学计算的要求.其次,介绍了LARED系列程序的主要功能以及在激光聚变物理研究中的应用,介绍了正在研制和发展的模拟激光聚变全过程的新一代高性能并行应用程序的思路.最后,介绍了激光聚变科学计算中面临的一些挑战性问题.
裴文兵朱少平
关键词:激光聚变
Scattering of light waves by electron electrostatic waves in laser produced plasmas
2010年
The propagation of light waves in an underdense plasma is studied using one-dimensional Vlasov-Maxwell numerical simulation. It is found that the light waves can be scattered by electron plasma waves as well as other heavily and weakly damping electron wave modes, corresponding to stimulated Raman and Brilluoin-like scatterings. The stimu- lated electron acoustic wave scattering is also observed as a high scattering level. High frequency plasma wave scattering is also observed. These electron electrostatic wave modes are due to a non-thermal electron distribution produced by the wave-particle interactions. The collision effects on stimulated electron acoustic wave and the laser intensity effects on the scattering spectra are also investigated.
刘占军项江郑春阳朱少平曹莉华贺贤土王宇钢
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