摘要
利用再发射技术能够有效测量早期辐射驱动对称性。2011年在神光Ⅱ激光装置上,采用Bi替代靶,通过改变靶丸的支撑方式和优化探测器配置,利用分幅相机获得较高信噪比的Bi球表面再发射图像。利用实验结果获得了入射流不对称性P2分量随时间的变化,对比两种腔长的黑腔,P2分量随时间的变化存在明显差别。两种腔P2分量随时间的变化趋势与采用视角因子模拟的结果基本一致。
Indirectly driven capsule implosions are driven by four shock waves whose strength and relative timing must be controlled to high precision to keep the fuel on a low adiabat. The symmetry during the first 2 ns should be tuned carefully. The mainline tuning targets chosen are the high Z re-emission spheres. For record of instantaneous asymmetry during the first 2 ns, multiple images in the time of the soft X-ray re emission from a non-imploding Bi ball on SGⅡ facility were taken in 2011. The re-emitted images with hohlraum lengths of 1350μm and 1500 μm were obtained and the experimental P2/Po and P4/Po time his tories were deduced. A simple analytical view-factor model is established, and the simulation result of P2/Po is in agreement with the measured P2/Po.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2013年第2期385-388,共4页
High Power Laser and Particle Beams
基金
国家高技术发展计划项目
关键词
再发射
早期不对称性
P2分量
Bi替代靶
re emission
early time hohlraum symmetry
P2 Legendre component
Bi alternative target
