激光-等离子体相互作用非特征模式下的双质子衰减不稳定性

IF 2 3区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS
Charles F. Wu, Yao Zhao, Hang-Hang Ma, Xu-Yan Jiang, Xiao-Feng Li, Su-Ming Weng, Min Chen, Zheng-Ming Sheng
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引用次数: 0

摘要

理论证明,激光与等离子体相互作用中的双等离子体衰减不稳定性(TPD)可在等离子体密度大于四分之一临界密度的非特征模式下被激发。当激光振幅大于某个阈值时,就会出现这种情况,而这个阈值会随着等离子体密度的增加而增大。在这种情况下,受激静电模式的频率恒定在入射光频率的一半左右。粒子入胞模拟验证了这一理论模型。模拟结果表明,在四分之一临界密度以上的等离子体中,非特征模式 TPD 比非特征模式受激拉曼散射(SRS)具有更高的泵浦激光阈值振幅。在不均匀等离子体中,非特征模式 TPD 和非特征模式 SRS 之间会发生竞争,因为前者的激发通常伴随着后者。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Two-plasmon-decay instability in the non-eigenmode regime in laser–plasma interaction
It is shown theoretically that the two-plasmon-decay instability (TPD) in laser–plasma interaction can be excited in the non-eigenmode regime, where the plasma density is larger than the quarter critical density. This appears when the laser amplitude is larger than a certain threshold value, which is found to increase with the plasma density. In this regime, the excited electrostatic modes have a constant frequency around half of the incident light frequency. The theoretical model is validated by particle-in-cell simulations. The simulation results show that the non-eigenmode TPD has a higher threshold amplitude for the pump laser than the non-eigenmode stimulated Raman scattering (SRS) excited in the plasma above the quarter critical density. In inhomogeneous plasma, competition between non-eigenmode TPD and non-eigenmode SRS occurs since the excitation of the former is normally accompanied by the latter.
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来源期刊
Physics of Plasmas
Physics of Plasmas 物理-物理:流体与等离子体
CiteScore
4.10
自引率
22.70%
发文量
653
审稿时长
2.5 months
期刊介绍: Physics of Plasmas (PoP), published by AIP Publishing in cooperation with the APS Division of Plasma Physics, is committed to the publication of original research in all areas of experimental and theoretical plasma physics. PoP publishes comprehensive and in-depth review manuscripts covering important areas of study and Special Topics highlighting new and cutting-edge developments in plasma physics. Every year a special issue publishes the invited and review papers from the most recent meeting of the APS Division of Plasma Physics. PoP covers a broad range of important research in this dynamic field, including: -Basic plasma phenomena, waves, instabilities -Nonlinear phenomena, turbulence, transport -Magnetically confined plasmas, heating, confinement -Inertially confined plasmas, high-energy density plasma science, warm dense matter -Ionospheric, solar-system, and astrophysical plasmas -Lasers, particle beams, accelerators, radiation generation -Radiation emission, absorption, and transport -Low-temperature plasmas, plasma applications, plasma sources, sheaths -Dusty plasmas
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