摘要:
利用一维辐射流体力学程序,对不同脉冲波形的辐射温度与Al中冲击波速度关系进行模拟计算和分析.指出定标公式T_r=0.0126~(0.63)主要适用于整形脉冲的辐射温度波形,而对高斯型和方波脉冲激光产生的辐射温度波形则不完全适用,通过计算给出修正的定标公式,且与自相似解得到的结果一致.另外对神光Ⅲ原型装置的整形脉冲辐射温度驱动Al样品冲击波轨迹进行了计算,得到第二个冲击波稳定传播所要求的Al样品的最小厚度.最后利用神光Ⅱ装置产生的辐射驱动冲击波,由修正的定标关系得到的辐射温度与软X射线能谱仪测量的辐射温度十分相符,从实验证实了修正定标关系的可靠性.
Abstract:
The scaling laws of the radiation temperature with shock wave velocity in Al were simulated and investigated with onedimensional radiation hydrodynamic program Hyades. The simulation results indicated that the formula T_r=0.0126D~(0.63) could be valid for the radiation temperature generated by the shaped pulse of lasers such as PS22 and PS26 profile on Nova facilities and Shenguang Ⅲ Prototype (SG Ⅲ Prot), but was not suited for the radiation temperature by laser pulse with the Gaussian and trapezoid profiles, for which the scaling should be given by the modified formula, which well agrees with similarity solution.Additionally, the minimum thickness sustaining stable shock wave velocity driven by the radiation temperature with the shaped profile on SG Ⅲ Prot was also obtained by using the Hyades code. Finally, The experiments of shock wave driven radiation were made on Shengnang Ⅱ laser facilities. The radiation temperature T_r calculated from the modified scaling relation well agreed with the T_r measured by the soft X-ray spectrometer. The experimental results also showed the reliability of the modified formula.
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