基于准同视轴的热斑电子温度高空间分辨探测技术研究

The high-space-resolving information of hot spot electron temperature is the foundation and key of the further research on implosion physical processes in Inertial Confinement Fusion. Internationally, multiple pinholes imaging is usually applied to the detection of the space-resolving emissivity ratio of Lyβ/Heβ from the hot spot doping element. And then, the electron temperature space-resolving information of hot spot could be extracted. However, the size of hot spot caused by the implosion compression is so small (30～60μm) and the space resolution provided by the pinhole imaging is so low (10～25μm) that it is very hard to meet the diagnosis requirements of the high-space-resolving electron temperature of precise physical researches, such as implosion hot-spot mixture, drive symmetry and so on. This application has proposed a new method, which uses two-channel KB microscopes to detect the electron temperature of hot spot with a high space resolution. In the study, optical quasi-coaxis method is used to eliminate the strong impact from viewing field difference, on the high space resolution and the correctness of electron temperature diagnosis in order to obtain two high-space-resolving (better than 2.5μm) X-ray emitting images of different energy points and high-space-resolving electron temperature detection results. Thus, this study will make a foundation for uncovering the pattern of impacts of asymmetric implosion drive in ICF on the hot-spot electron temperature distribution, which has an important significance on the further understanding of the process relevant to the implosion-physics.

获取热斑电子温度的高空间分辨信息，是深入研究惯性约束聚变内爆物理过程的基础和关键。国际上通常采用多针孔成像技术，测量空间分辨的热斑掺杂元素发射线强比Lyβ/Heβ，提取热斑电子温度空间分辨信息。然而，内爆压缩热斑尺寸小（30～60μm），针孔成像能够提供的空间分辨低（10～25μm），难以满足内爆热斑混合、驱动对称性等精密物理研究中对高空间分辨电子温度的诊断需求。本项目提出了一种新的利用两通道KB镜进行高空间分辨热斑电子温度探测的方法。研究中利用准同视轴方法消除视场差异对电子温度诊断高空间分辨以及正确性的显著影响，以获得热斑上两幅高空间分辨（优于2.5μm）不同能点X射线发光图像及高空间分辨电子温度诊断结果，为揭示ICF中非对称内爆驱动对热斑电子温度分布的影响规律奠定基础，对深入理解内爆物理相关过程具有重要意义。

获取热斑电子温度的高空间分辨信息，是深入研究惯性约束聚变内爆物理过程的基础和关键。然而国际上通常采用的探测方法具有空间分辨低，引起辐射致冷效应等不足。本项目提出了一种新的利用两通道KB镜进行高空间分辨热斑电子温度探测的方法。研究中利用准同视轴方法消除视场差异对电子温度诊断高空间分辨以及正确性的显著影响。通过获取热斑上高空间分辨准单能X射线自发光图像，提取了一维高空间分辨（3～5μm）电子温度诊断结果。同时还深入研究了与之密切相关的内爆驱动X射线源对辐射温度的定量化影响。为校验内爆理论模拟程序提供了重要的定量参数，为揭示ICF中非对称内爆驱动对热斑电子温度分布的影响规律奠定了基础，对深入理解内爆物理相关过程具有重要意义。

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