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基于稠密物质辐射不透明度的理论计算目前有相当大的难度, 而稠密物质高精度不透明度数据又对聚变研究中的理论设计和模拟以及状态诊断等方面非常有用. 在神光II激光装置上建立一发次中能同时测量背光谱、 样品自发谱和吸收谱的大谱窗高分辨椭圆弯晶测谱系统, 并利用一维辐射流体力学程序MULTI仿真冲击波碰撞压缩样品的过程.在测量中, 用点投影背光法、激光烧蚀冲击波碰撞压缩产生稠密铝(Al)样品, 激光镱等离子体3d4f 跃迁辐射为短脉冲背光提供样品吸收谱时空分辨诊断, 在一发次打靶中得到了背光谱、样品自发谱和X射线吸收精细结构谱, 以及稠密Al辐射吸收谱向长波偏移.实验结果给出了诊断能谱区稠密Al相对透射率分布和吸收谱偏移量. 这些工作都有益于丰富不透明度这一基础研究领域和进一步开拓许多重要应用.The high-precise opacity of the dense plasma has important applications in the design and simulation of fusion research, and in plasma diagnostics. Base on the novel technique of point-projection backlighting, a broadband high-resolution elliptical crystal X-ray spectrometer, which is used to measure simultaneously the self-emission spectrum, the backlighting source spectrum, and the transmission spectrum in one shot, is designed on the Shengguang-II laser facility. The process of the colliding-shock-compressed sample by laser-driven shock waves is also investigated using a one-dimensional radiation hydrodynamics code MULTI. In the measurement, the dense plasma, produced in aluminum by colliding shocks driven by laser beams, reaches a peak density several times that of a solid, and the short backlighting from the 3d-4f transition bands of ytterbium is used as an absorption source for time- and space-resolving diagnostics. Several experimental results are obtained, they are the X-ray source spectrum, the transmission spectrum, and the self-emission spectrum of the dense Al sample in one shot obtained by using the point-projection method, as well as X-ray-absorption fine-structure spectra, and the changes in the K-shell photo-absorption edge of aluminum as it was compressed by a laser-driven shock waves. The transmissivity distribution and red- shift around 80 m (with respect to the cold value of 1.56 keV) of the dense aluminum are also obtained. The data obtained are further analysed. As a result, a new theoretical model is developed.
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Keywords:
- plasma production by shock waves and compression /
- X-ray absorption spectra /
- line shift /
- fine structure
[1] DaSilva L, Ng A, Godwal B K, Chiu G, Cottet F, Richardson M C, Jaanimagi P A, Lee Y T 1989 Phys. Rev. Lett. 62 1623
[2] Campbell E M, Holmes N C, Libby S B, Remington B A, Teller E 1997 Laser and Particle Beams 15 607
[3] Stewart J, Pyatt K 1996 J. Astrophys. 144 1203
[4] Christian R H, Yarger F L 1955 J. Chem. Phys. 23 2042
[5] Wang F H, Chen J P, Meng X J, Zhou X M, Li X J, Sun Y S, Jing F Q 2001 Acta Phys. Sin. 50 1308 (in Chinese) [王藩侯, 陈敬平, 孟续军, 周显明, 李西军, 孙永盛, 经福谦 2001 物理学报 50 1308]
[6] Pisani F, Koening M 1999 Rev. Sci. Instrum. 70 3314
[7] Zhang J Y, Yang J M, Xu Y, Yang G H, Yan J, Meng G W, Ding Y N, Wang Y 2008 Acta Phys. Sin. 57 689 (in Chinese) [张继彦, 杨家敏, 许琰, 杨国洪, 颜君, 孟广为, 丁耀南, 汪艳 2008 物理学报 57 689]
[8] Anderson S G, Heeter R F, Booth R, Eming J, Fulkerson S, McCarville T, Norman D, Young B K F 2006 Rev. Sci. Instrum. 77 063115
[9] Audebert P, Renaudin P, Ceccotti S B, Geindre J P, Popovics C C, Tzortzakis S, Silvert V N, Shepherd R, Matsushima I, Gary S, Girard F, Peyrusse O, Gauthier J C 2005 Phys. Rev. Lett. 94 025004
[10] Zhao Y, Yang J M, Zhang J Y, Liu J S, Yuan X, Jin F T 2009 Rev. Sci. Instrum. 80 043505
[11] Cai L C, Chen Q F, Gu Y J, Jing F Q 2005 At. Mol. Phys. 22 43 (in Chinese) [蔡灵仓, 陈其峰, 顾云军, 经福谦 2005 原子与分子物理学报 22 43]
[12] Kuzee J A, Hall T A, Frey H D 1998 Phys. Rev. E 57 7060
[13] Godwal B K, Ng A, Silva L D, Lee Y T, Liber 1989 Phys. Rev. A 40 4521
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[1] DaSilva L, Ng A, Godwal B K, Chiu G, Cottet F, Richardson M C, Jaanimagi P A, Lee Y T 1989 Phys. Rev. Lett. 62 1623
[2] Campbell E M, Holmes N C, Libby S B, Remington B A, Teller E 1997 Laser and Particle Beams 15 607
[3] Stewart J, Pyatt K 1996 J. Astrophys. 144 1203
[4] Christian R H, Yarger F L 1955 J. Chem. Phys. 23 2042
[5] Wang F H, Chen J P, Meng X J, Zhou X M, Li X J, Sun Y S, Jing F Q 2001 Acta Phys. Sin. 50 1308 (in Chinese) [王藩侯, 陈敬平, 孟续军, 周显明, 李西军, 孙永盛, 经福谦 2001 物理学报 50 1308]
[6] Pisani F, Koening M 1999 Rev. Sci. Instrum. 70 3314
[7] Zhang J Y, Yang J M, Xu Y, Yang G H, Yan J, Meng G W, Ding Y N, Wang Y 2008 Acta Phys. Sin. 57 689 (in Chinese) [张继彦, 杨家敏, 许琰, 杨国洪, 颜君, 孟广为, 丁耀南, 汪艳 2008 物理学报 57 689]
[8] Anderson S G, Heeter R F, Booth R, Eming J, Fulkerson S, McCarville T, Norman D, Young B K F 2006 Rev. Sci. Instrum. 77 063115
[9] Audebert P, Renaudin P, Ceccotti S B, Geindre J P, Popovics C C, Tzortzakis S, Silvert V N, Shepherd R, Matsushima I, Gary S, Girard F, Peyrusse O, Gauthier J C 2005 Phys. Rev. Lett. 94 025004
[10] Zhao Y, Yang J M, Zhang J Y, Liu J S, Yuan X, Jin F T 2009 Rev. Sci. Instrum. 80 043505
[11] Cai L C, Chen Q F, Gu Y J, Jing F Q 2005 At. Mol. Phys. 22 43 (in Chinese) [蔡灵仓, 陈其峰, 顾云军, 经福谦 2005 原子与分子物理学报 22 43]
[12] Kuzee J A, Hall T A, Frey H D 1998 Phys. Rev. E 57 7060
[13] Godwal B K, Ng A, Silva L D, Lee Y T, Liber 1989 Phys. Rev. A 40 4521
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