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| 1 | 激光等离子体不稳定性及其抑制方案研究显示文摘受激拉曼散射、受激布里渊散射等激光等离子体不稳定性(LPI)是激光等离子体物理领域最重要的研究课题之一。特别是在激光驱动的惯性约束聚变中,LPI会造成相当份额的激光能量损失,破坏辐射对称性,产生的超热电子还会预热靶丸,进而影响压缩效率和聚变能量增益。近期,在美国国家点火装置上开展的实验表明对LPI物理过程的充分理解和有效控制对成功实现ICF点火至关重要。我们对近期LPI方面的一系列研究进展进行了简单介绍与讨论。首先,回顾了描述LPI过程的三波耦合理论,由此得出了LPI在线性阶段的增长率。接着讨论了一些复杂情景下的LPI物理过程,譬如LPI的非线性发展阶段、级联LPI、多光束LPI以及LPI间的非线性耦合。最后,着重介绍了一系列抑制LPI的技术方案,包括束匀滑技术、光束时域整形、宽带激光、偏振旋转激光以及外加磁场等。 | 余诗瀚 李晓锋 翁苏明 赵耀 马行行 陈民 盛政明 | 2021 | 强激光与粒子束2021，33，1： | 4 |
| 2 | Convective amplification of stimulated Raman rescattering in a picosecond laser plasma interaction regime显示文摘We present particle-in-cell(PIC)simulations of laser plasma instabilities(LPIs)with a laser pulse duration of a few picoseconds.The simulation parameters are appropriate to the planar-target LPI experimental conditions on SG-II.In this regime,the plasmas are characterized by a long electron density scale length and a large electron density range.It is found that when the incident laser intensity is well above its backward stimulated Raman scattering(backward SRS,BSRS)threshold,the backscattered light via the primary BSRS is intense enough to excite secondary SRS(Re-SRS)in the region below one-ninth of the critical density of the incident laser.The daughter light wave via the secondary BSRS(Re-BSRS)is amplified as it propagates toward the higher-density region in the bath of broadband light generated through the primary BSRS process.A higher intensity of the incident laser not only increases the amplitude of the BSRS light but also increases the convective amplification lengths of the Re-BSRS modes by broadening the spectrum of the BSRS light.Convective amplification of Re-BSRS causes pump depletion of the primary BSRS light and may lead to an underestimate of the primary BSRS level in SP-LPI experiments.Asignificant fraction of the generation of energetic electrons is strongly correlated with the Re-BSRS modes and should be considered as a significant energy loss. | Yu Ji Chang-Wang Lian Rui Yan Chuang Ren Dong Yang Zhen-Hua Wan Bin Zhao Chen Wang Zhi-Heng Fang Jian Zheng | 2021 | Matter and Radiation at Extremes2021，6，1： | 0 |
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