Implosion ablated convergence measurement on Shenguang laser facilities
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摘要: 间接驱动惯性约束聚变研究中，获得高内爆速度是实现点火，提升聚变增益的关键。通过对内爆烧蚀压缩过程的测量，能够获得内爆速度和剩余质量等内爆动力学重要的物理量，实现烧蚀层材料、厚度以及激光波形等参数的优化。近几年在神光系列装置上，演示了常规的应用狭缝成像的内爆烧蚀压缩过程测量技术，发展了基于球面弯晶成像的高分辨单能内爆烧蚀压缩过程测量技术。通过对球面弯晶成像系统设计的持续改进以及内爆烧蚀压缩过程测量技术的优化，结合实验室和系统原位标定结果，建立了高分辨的内爆压缩流线诊断技术，采用替代靶方式，实现内了爆速度不确定度2.1%的测量精度。Abstract: For ignition and high fusion gain, it’s the key issue to achieve high implosion velocity in inertial confinement fusion. The important implosion dynamics quantities like implosion velocity and residual mass can be diagnosed by implosion ablated convergence measurement. The measured results will be used to modify the point design, optimizing the ablator materials, thickness and laser pulse profiles. In recent years, we demonstrated the conventional implosion ablated convergence measurement on Shenguang laser facilities with the slit imaging technique. The high spatial resolution monochromatic imaging technique based on the spherically bent crystal was developed and used for the implosion ablated convergence measurement. With the continuing improvements of the imaging system and the modification of the diagnostics, a high spatial resolution implosion trajectory diagnosis has been implemented. The implosion velocities are measured with high precision while the uncertainties are not greater than 2.1%.
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Key words:
- implosion trajectory /
- implosion velocity /
- residual mass /
- monochromatic imaging
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图 1 内爆烧蚀压缩过程测量原理演示
Figure 1. Principle of the implosion ablated convergence measurement
图 2 不同密度分布拟合结果与模拟结果对比
Figure 2. Comparison with the simulation density profile and different fitting density profiles
图 3 神光系列装置上基于狭缝成像的内爆烧蚀压缩过程测量结果
Figure 3. Image of ablated convergence measurement based on slit radiography on Shenguang laser facilities
图 4 神光系列装置上基于弯晶成像的内爆烧蚀压缩过程测量结果
Figure 4. Image of ablated convergence measurement based on spherically bent crystal imager on Shenguang laser facilities
图 5 55 μm CH烧蚀层内爆靶与内层2.5 μm SiO2替代靶时透过率对比
Figure 5. Transmission comparison with 55 μm CH ablator and ablator subsituted by 2.5 μm SiO2 at inner interface
图 6 替代靶设计内爆烧蚀压缩过程测量结果
Figure 6. Image of ablated convergence measurement with the subsituted capsule design
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