Experimental research on high-pressure loading technology of multiple thermodynamic paths on 10 kJ-level laser facility
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摘要: 针对极端高压条件物质特性研究需求，在我国万焦耳激光装置上利用其高能量、高功率、任意整形长脉冲输出的技术优势先后开展了冲击压缩、准等熵压缩以及“预冲击准等熵压缩”复合热力学路径压缩等多种热力学路径的高压加载技术研究，建立了实用的高压加载设计方法，重点优化了高压加载源的平面性和干净性，发展了高压状态精密表征技术，实现了1011 Pa以上准等熵，1012 Pa以上冲击以及两种路径之间的宽区高压加载状态能力，为激光装置上的高压状态方程及相变动力学研究提供了重要的技术基础。Abstract: In order to carry out scientific research on the properties of materials under extremely high pressure conditions, a series of laser-driven high pressure loading technology based on Hügoniot, quasi-isentropic compression and “shock+quasi-isentropic” composite thermodynamic path compression have been developed on 10 kJ-level laser facility. The practical high-pressure loading design method has been established and optimization research on planarity, cleanness of compression wave has been performed. High-pressure state generation capability in wide parameter area which covers from above 1011 Pa of quasi-isentropic compression to above 1012 Pa of Hügoniot compression has been implemented, which provides an important technical foundation for the study of the high-pressure state equation and phase transition dynamics on the laser device.
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图 1 激光装置上三种典型热力学路径高压加载路线的示意图：（a）冲击压缩路径；（b）准等熵压缩路径；（c）预冲击准等熵压缩路径
Figure 1. Schematic diagram of high-pressure loading routes based on three typical thermodynamic paths on the laser facility：（a）shock compression path；（b）quasi-isentropic compression path；（c）“shock+quasi-isentropic” composite thermodynamic path
图 2 万焦耳激光装置典型冲击压缩实验布局图：（a）实验设置；（b）VISAR测量结果；（c）PSBO测量结果
Figure 2. Typical shock compression experiment lasyout：（a）experimental setup；（b）shock velocity detected by VISAR；（c）shock breakout detected by PSBO
图 3 万焦耳激光装置典型间接驱动冲击加载源平面性测量结果
Figure 3. Experimental result of indirectly laser-driven shock planarity
图 4 高灵敏度干净性实验表征技术
Figure 4. Experimental characterization technology of shock cleanness with high sensitivity
图 6 基于辐射流体程序的非稳冲击加载技术分析[23]
Figure 6. Analysis of unsteady shock loading technology based on the radiation hydrodynamic simulation
图 7 基于铁材料的典型激光间接驱动冲击压缩实验结果
Figure 7. Typical indirectly-laser-driven shock Hügoniot experimental result of iron，where Ds represents shock velocity with relative uncertainty components such as sample height，transit time，shock planarity，shock stability
图 8 激光驱动准等熵加载验证性实验
Figure 8. Verification experiment of laser-driven quasi-isentropic loading technology
图 9 激光驱动铝准等熵压缩实验[34]
Figure 9. Laser-driven quasi-isentropic compression experiment of Aluminum
图 10 激光驱动准等熵压缩实验LiF窗口致盲现象优化研究
Figure 10. Optimization of LiF window blinding in laser-driven quasi-isentropic compression experiment
图 11 激光间接驱动准等熵压缩实验布局
Figure 11. Layout of indirectly laser-driven quasi-isentropic compression experiment
图 12 “预冲击准等熵压缩”的复合热力学路径设计示意图
Figure 12. Schematic diagram of high pressure loading along “shock + quasi-isentropic” composite thermodynamic path
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