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Self-interference patterns and their application to inertial-fusion target characterization

机译：自干扰模式及其在惯性融合目标表征中的应用

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摘要

The sphericity and wall-thickness uniformity requirements of direct-drive inertial-fusion targets are of the order of less than 1%. These shells display self-interference patterns (SIP's) when irradiated with a spatially incoherent, narrow-bandwidth light source and viewed with a compound microscope. These patterns are distinct concentric fringes when the target is uniform, whereas faint, distorted, or discontinuous fringes indicate a nonuniform target. We determined the wall thickness to within ±0.5 μm by counting the number of fringes in the SIP, independent of the outside diameter. Thickness uniformity is verified to an accuracy better than 0.05 μm. The wall thickness of gas-filled targets can be determined to tiffs accuracy without knowledge of the type of gas or its pressure. The SIP fringe technique is used to select polymer shells typically of 800- to 1000-μm diameter and 5- to 12-μm wall thickness. The fringe locations have been modeled by use of ray tracing and agree well with actual measurements of wellcharacterized shells. Details of the formation of the SIP fringes, a theoretical model, and the method used for quantitative measurement of the shell-wall thickness with the SIP are presented with validaticon examples.
机译：直接驱动惯性融合靶的球形度和壁厚均匀性要求小于1％。当用空间不连贯的窄带宽光源照射并用复合显微镜观察时，这些壳会显示出自干涉图案（SIP）。当目标均匀时，这些图案是截然不同的同心条纹，而模糊，扭曲或不连续的条纹则表示目标不均匀。通过计算SIP中条纹的数量，与外径无关，我们将壁厚确定在±0.5μm以内。验证厚度均匀性的精度优于0.05μm。可以确定充气目标的壁厚，以达到准确度，而无需了解气体的类型或压力。 SIP条纹技术用于选择直径通常为800至1000μm，壁厚为5至12μm的聚合物壳。边缘位置已通过光线追踪进行建模，并与特征明确的炮弹的实际测量结果非常吻合。结合有效的实例，详细介绍了SIP条纹的形成，理论模型以及用SIP定量测量壳壁厚度的方法。

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