Shock wave velocity measurement in the Al2O3 under ultrahigh pressure
Shock wave velocity measurement in the Al2O3 under ultrahigh pressure
复制标题
超高压下 Al2O3 中的冲击波速度测量
DOI：
10.1088/1674-1056/20/6/065202
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发表时间：
2011
影响因子：
1.7
通讯作者：
蒋小华
中科院分区：
文献类型：
--
作者：
彭晓世;刘慎业;王峰;李永升;丁永坤;蒋小华
在间接驱动实验中，黑洞X射线产生的空白效应会在光学条纹相机(OSC)的时间尺度上显示出暗区。这种空白效应是间接驱动冲击波实验中的一个严重问题，已用半导体模型进行了解释。X射线引起带间跃迁，探测光被带内跃迁吸收，从而导致OSC图像在时间尺度上出现暗区。在实验中，当激波速度为32公里/S时，测得激波阵面的反射率约为50%，并与Drude自由电子模型的理论计算进行了比较。从实验数据可以看出，当铝层厚度大于60μm时，在170 eV的辐射温度下可以避免空白效应。
In indirect-drive experiment, the blank effect caused by X-rays from Hohlraum will show the dark area in time scale of optical streak camera (OSC). This blank effect, which was a serious problem in indirect-drive shock wave experiments, has been explained by the semiconductor model. The X-rays cause the band to band transition and the probe laser is absorbed by the intraband transition, which leads to a dark region in time scale of the OSC image. In the experiment, the reflectivity of shock wave front was measured to be about 50% at shock wave velocity 32 km/s and was compared to the theoretical calculations with the Drude free electron model. From the experimental data, it is found that the blank effect can be avoided at radiation temperature of 170 eV if the Al layer is thicker than 60 μm.