强激光与粒子束, 2013, 25 (2): 385, 网络出版: 2013-01-07   

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
作者单位
中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621900
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。
Abstract
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 1350 μm and 1500 μm were obtained and the experimental P2/P0 and P4/P0 time histories were deduced. A simple analytical viewfactor model is established, and the simulation result of P2/P0 is in agreement with the measured P2/P0.

陈伯伦, 蒋炜, 景龙飞, 袁铮, 黎航, 余波, 蒲昱东, 苏明, 晏骥, 黄天晅, 江少恩, 刘慎业, 杨家敏, 丁永坤. 再发射技术测量SGⅡ黑腔靶早期对称性[J]. 强激光与粒子束, 2013, 25(2): 385. Chen Bolun, Jiang Wei, Jing Longfei, Yuan Zheng, Li Hang, Yu Bo, Pu Yudong, Su Ming, Yan Ji, Huang Tianxuan, Jiang Shaoen, Liu Shenye, Yang Jiamin, Ding Yongkun. Reemission technique for early time, hohlraum radiation symmetry measurements on SGⅡ facility[J]. High Power Laser and Particle Beams, 2013, 25(2): 385.

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