Shock wave velocity measurement in the Al2O3 under ultrahigh pressure

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...

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Bibliographic Details
Published inChinese physics B Vol. 20; no. 6; pp. 307 - 312
Main Author 王峰 彭晓世 刘慎业 李永升 蒋小华 丁永坤
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.06.2011
Subjects
Al2O3
Aluminum oxide
Blanks
Lasers
Reflectivity
Semiconductors
Shock waves
X-rays
冲击波速度
半导体模型
实验数据
自由电子模型
超高压
速度测量
间接驱动
Online AccessGet full text
ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/20/6/065202

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Summary: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 60μm.
Bibliography: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 60μm.
Wang Feng Peng Xiao-Shi, Liu Shen-Ye, Li Vong-Sheng, Jiang Xiao-Hua, and Ding Yong-Kun（ Research Centre of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900, China b） Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
shock wave, optical diagnosis, interfere meter, semiconductor model
11-5639/O4
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SourceType-Scholarly Journals-1
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ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/6/065202