In-situ characterization technology for shock wave loading symmetry of small-sized target
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摘要: 双轴VISAR诊断技术能够同时诊断靶丸不同区域的冲击波速度历程，对内爆冲击波加载过程的含时不对称性进行原位表征，是惯性约束聚变实验研究中的重要诊断技术。神光十万焦耳装置综合内爆实验通常采用直径约为850 µm的靶丸，更小的靶丸尺寸为双轴VISAR诊断技术建立带来更高的挑战。面向十万焦耳激光装置所使用的小尺寸靶丸开展双轴诊断技术研究，建立了成像仿真模型，基于该模型对三类典型的影响因素进行细致分析并指导靶丸设计。结合模拟分析及优化设计结果，基于小靶丸腔靶结构建立了双轴VISAR诊断技术，并诊断获得赤道及极区的冲击波速度历程，完成不同驱动方式下的冲击波加载对称性对比。通过本文研究，基于模拟仿真及优化设计解决了双轴VISAR诊断技术难题，通过实验对冲击波加载对称性原位表征技术进行了验证，为后续腔型结构及驱动波形优化设计奠定了诊断基础。
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关键词:
- 任意反射面速度干涉仪 /
- 双轴VISAR /
- 冲击波加载对称性 /
- 内爆压缩
Abstract:Background The dual-axis VISAR diagnostic technology can simultaneously diagnose the shock wave velocity history in different regions of the target and perform in-situ characterization of the temporal asymmetry during the implosion shock wave loading process. It is an important diagnostic technology in inertial confinement fusion (ICF) experimental research.Purpose The integrated implosion experiments of the Shenguang Ten-Thousand-Joule Facility typically use target pellets with an inner diameter of approximately 850 micrometers (μm), and smaller target sizes pose greater challenges to the establishment of the dual-axis VISAR diagnostic technology. Focusing on the small-sized target used in small laser facilities, this paper conducts research on the dual-axis VISAR diagnostic technology.Methods We established an imaging simulation model. Based on this model, a detailed analysis of three typical influencing factors is conducted, which provides guidance for target design.Results Relying on the cavity target structure of small target, the shock wave velocity histories in the equatorial and polar regions are obtained through diagnostics. The comparison of shock wave loading symmetry under different driving conditions is completed.Conclusions Based on this study, the technical challenges of dual-axis VISAR diagnostics have been addressed through simulation and optimization design. Experiments validated in-situ characterization techniques for shock-wave loading symmetry, establishing a diagnostic foundation for subsequent optimization of cavity structures and drive waveforms. -
图 2 双轴VISAR诊断原理示意图
Figure 2. Schematic diagram of the dual-axis VISAR diagnostic principle
图 3 大靶丸及小靶丸结构下双轴VISAR诊断图像模拟结果
Figure 3. Simulation results of dual-axis VISAR under the structures of large target and small target
图 4 双轴VISAR成像光路仿真模型
Figure 4. Simulation model of dual-axis VISAR imaging optical path
图 5 制靶过程中可能存在的偏离因素示意图
Figure 5. Schematic diagram of possible deviation factors during target fabrication
图 7 各装配情形下，极区信号横向尺寸仿真结果
Figure 7. Simulation results of the dimensions of polar signals
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