Typical inertial confinement fusion (ICF) plasmas have ultra-high energy density state (UHEDs) with an energy density exceeding 1 × 10⁸ Jcm⁻³, which corresponds to a pressure of beyond 1 Gbar. In previous investigation, it is suggested that such an UHEDs condition could be generated with a tabletop ultrahigh intensity laser, by irradiating onto a nanowire array. In this research, we have developed to observe the laser energy absorption and transport mechanism in nanowire array samples with x-ray free electron laser facility SACLA. We obtained time-resolved snapshots of x-ray shadowgraph image with very high temporal resolution. From the measured images, however, the UHEDs might be generated only on very thin portion of the target surface because the mean density of the nanowire array was large. On the other hand, we observed significant rear surface expansion in late timing, suggesting that large laser energy deposition was achieved for the nanowire array samples.

典型的惯性约束聚变（ICF）等离子体具有超高能量密度状态（UHED），能量密度超过1×10 ⁸ Jcm ^-3，对应的压力超过1 Gbar。在先前的研究中，建议可以通过照射到纳米线阵列上的台式超高强度激光来产生这种UHEDs条件。在这项研究中，我们已经开发出了使用X射线自由电子激光设备SACLA观察纳米线阵列样品中激光能量吸收和传输机制的方法。我们获得了具有很高时间分辨率的X射线阴影图图像的时间分辨快照。但是，由于纳米线阵列的平均密度很大，因此从测量的图像来看，UHED可能仅在目标表面的非常薄的部分上生成。另一方面，我们在后期观察到明显的后表面膨胀，这表明纳米线阵列样品实现了较大的激光能量沉积。