Radiographs of pure-DT cryogenic imploding shells provide critical validation of progress toward ignition-scalable performance of inertial confinement fusion implosions [J. Nuckolls et al., Nature 239, 139 (1972)]. Cryogenic implosions on the OMEGA Laser System [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] can be self-radiographed by their own core spectral emission near ≈2 keV. Utilizing the distinct spectral dependences of continuum emissivity and opacity, the projected optical-thickness distribution of imploded shells, i.e., the shell radiograph, can be distinguished from the structure of the core emission distribution in images. Importantly, this can be done without relying on spectral additives (shell dopants), as in previous applications of implosion self-radiography [V. A. Smalyuk et al., Phys. Rev. Lett. 87, 155002 (2001); L. A. Pickworth et al., ibid. 117, 035001 (2016)]. Demonstrations with simulated data show that this technique is remarkably well-suited to cryogenic implosions and can also be applied to self-radiography of imploded room-temperature CH shells at higher spectral energy (hv ≈ 3–5 keV) based on the very similar continuum spectrum of carbon. Experimental demonstration of additive-free self-radiography with warm CH shell implosions on OMEGA will provide an important proof of principle for future applications to cryogenic DT implosions.

中文翻译：

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基于无添加剂的多单色连续光谱分析的OMEGA内爆壳的放射自显影

纯DT低温内爆壳的X射线照片为惯性约束聚变内爆的可点火缩放性能的进展提供了关键的验证[J．Nuckolls等。，Nature 239，139（1972）]。OMEGA激光系统上的低温爆裂[TR Boehly等。，选项。社区 133，495（1997）]可以通过其自身的≈2keV附近的核心光谱发射进行自射线照相。利用连续发射率和不透明性的独特光谱依赖性，可以将内爆壳的投影光学厚度分布（即壳X射线照片）与图像中核心发射分布的结构区分开。重要的是，如内爆自射线照相的先前应用[VA Smalyuk et al。，物理 牧师 87，155002（2001）; LA Pickworth等。，同上。117，035001（2016）]。用模拟数据进行的演示表明，该技术非常适合低温内爆，并且还可以基于非常相似的连续谱，以较高的光谱能量（hv≈3–5 keV）将其应用于内爆的室温CH壳的自射线照相。碳谱。在OMEGA上用温暖的CH壳内爆进行无添加剂自射线照相的实验演示，将为今后在低温DT内爆中的应用提供重要的原理证明。