We have performed refraction enhanced radiography (RER) measurements of indirect drive layered high density carbon capsule implosions relevant for inertial confinement fusion. Streaked RER data using a 5 µm wide imaging slit, backlit by a 7.8 keV Ni He-α laser driven x-ray source, shows features due to inflight density gradients in the ablator and fuel ice that are not visible in absorption only radiographs. To avoid motional blurring at smaller in-flight radii, we concentrate our probe to the main compression and N+1 shock phases. During the main compression phase, both simulations and data show fringes consistent with steep density gradients. During the later N+1 shock phase we see loss of fringes and hence infer less fuel compression than simulated, that may be caused by ice-ablator mix. Quantitative analysis shows that at the ablation front during the main compression phase, the simulated density differential agrees with the data, but the inferred scale length is 50% longer than simulated. During the N+1 shock phase, the data shows 2x higher ablation front density than simulated for similar scale lengths that may be affected by data cross talk with the reduced fuel compression at the ice-ablator interface.

我们已经进行了与惯性约束聚变有关的间接驱动分层高密度碳胶囊内爆的折射增强射线照相（RER）测量。使用由7.8 keV NiHe-α激光驱动的X射线源进行背光照明的5 µm宽成像狭缝形成的条纹RER数据显示了由于烧蚀器和燃料冰中的飞行密度梯度而导致的特征，这些特征在仅吸收X射线照片中不可见。为了避免在较小的飞行半径下出现运动模糊，我们将探头集中在主压缩阶段和N + 1冲击阶段。在主压缩阶段，模拟和数据均显示出与陡峭的密度梯度一致的条纹。在随后的N + 1冲击阶段，我们看到条纹损失，因此推断出的燃料压缩比模拟的少，这可能是由融冰机造成的。定量分析表明，在主压缩阶段的消融前沿，模拟的密度差与数据一致，但是推断的标尺长度比模拟的长50％。在N + 1冲击阶段，数据显示的消融锋面密度比类似鳞片长度的模拟值高2倍，这可能会受到数据串扰的影响，而消冰器接口处的燃料压缩会降低。