再发射技术测量SGⅡ黑腔靶早期对称性  

Re-emission technique for early time,hohlraum radiation symmetry measurements on SGⅡ facility

作　　者：陈伯伦[1] 蒋炜[1] 景龙飞[1] 袁铮[1] 黎航[1] 余波[1] 蒲昱东[1] 苏明[1] 晏骥[1] 黄天晅[1] 江少恩[1] 刘慎业[1] 杨家敏[1] 丁永坤[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》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

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.

关 键 词：再发射 早期不对称性 P2分量 Bi替代靶 

分 类 号：TN244[电子电信—物理电子学]