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Direct measurement technique for shock wave velocity under super high pressure

Li Yong-Sheng Wang Feng Peng Xiao-Shi Liu Shen-Ye Jiang Xiao-Hua Ding Yong-Kun

Direct measurement technique for shock wave velocity under super high pressure

Li Yong-Sheng, Wang Feng, Peng Xiao-Shi, Liu Shen-Ye, Jiang Xiao-Hua, Ding Yong-Kun
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  • Received Date:  22 October 2009
  • Accepted Date:  27 April 2010
  • Published Online:  05 January 2011

Direct measurement technique for shock wave velocity under super high pressure

  • 1. (1)Institute of Applied Physics and Computational Mathematics, Beijing 100088,China; (2)Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China

Abstract: With the ionization mechanism for the transparent material under the super high pressure, the basic measurement method of shock wave has been analyzed. With the Drude-free electron model, the change in reflectivity of shock wave front under different pressures has been analyzed. The reflectivity of shock wave front for different probe lasers has been compared in theory. And it was found that the reflectivity of shock wave front for 660 nm of probe laser is higher than that for 532 nm. The effect of the detector was found to be caused by the X-ray ionization of the transparent material after analyzing the reflectivity data in space-time scale. From the experiment data, it is found that the beginning of "blank" effect coincides with the start point of laser pulse. The shock wave is later than the "blank" effect under the square laser pulse. In the experiment, the reflectivity of shock wave front is about 40% when the shock velocity is 35 km/s. The theoretical decreasing curve of shock velocity in the sapphire window is confirmed by the experiment data. The formula to calculate the shock wave velocity in the transparent material was deduced and verified.

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