Back CA, Bauer JD, Landen OL, Turner RE, Lasinski BF, Hammer JH, Rosen MD, Suter LJ, Hsing WH
Lawrence Livermore National Laboratory, L-21, P.O. Box 808, Livermore, California 94551, USA.
Phys Rev Lett. 2000 Jan 10;84(2):274-7. doi: 10.1103/PhysRevLett.84.274.
We have made the first detailed measurements of a diffusive supersonic radiation wave in the laboratory. A 10 mg/cm(3) SiO2 foam is radiatively heated by the x-ray flux from a laser-irradiated hohlraum. The resulting radiation wave propagates axially through the optically thick foam and is measured via time-resolved x-ray imaging as it breaks out the far end. The data show that the radiation wave breaks out at the center prior to breaking out at the edges, indicating a significant curvature in the radiation front. This curvature is primarily due to energy loss into the walls surrounding the foam.
我们在实验室中首次对扩散超音速辐射波进行了详细测量。一种密度为10毫克/立方厘米的二氧化硅泡沫被来自激光辐照黑腔的X射线通量进行辐射加热。由此产生的辐射波沿轴向穿过光学厚泡沫，并在其从远端穿出时通过时间分辨X射线成像进行测量。数据表明，辐射波在边缘穿出之前先在中心穿出，这表明辐射前沿存在显著的曲率。这种曲率主要是由于能量损失到泡沫周围的壁中。
