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
Reemission technique for early time, hohlraum radiation symmetry measurements on SGⅡ facility
再发射 早期不对称性 P2分量 Bi替代靶 reemission early time hohlraum symmetry P2 Legendre component Bi alternative target
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 reemission spheres. For record of instantaneous asymmetry during the first 2 ns, multiple images in the time of the soft Xray reemission from a nonimploding Bi ball on SGⅡ facility were taken in 2011. The reemitted 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 viewfactor 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. Reemission technique for early time, hohlraum radiation symmetry measurements on SGⅡ facility[J]. High Power Laser and Particle Beams, 2013, 25(2): 385.