激光驱动气库靶对铝的准等熵压缩实验研究

利用激光驱动气库材料形成的等离子体射流对材料进行斜波加载, 可以获得高应变率的准等熵压缩. 在神光III 原型高功率激光装置上开展了激光驱动铝材料的准等熵压缩实验, 成像型速度干涉仪VISAR记录到样品自由面连续、光滑的速度历史, 采用反积分法得到60 GPa以上的峰值压强, 加载上升沿约10 ns,应变率可达10⁸ s ^-1, 并且观察到了压缩波在样品后表面的反射效应.

Laser-driven reservoir target for quasi-isentropic compression in aluminum

The quasi-isentropic compression of material with high strain rate can be obtained by the ramp wave loading of plasma jet produced by laser-driven reservoir target.The quasi-isentropic compression experiments of aluminum are carried out on the high power laser facility of SG-III prototype.The smooth and continuous speed history of free surface of specimen is recorded with a lineimaging velocity interferometer（VISAR）.The peak pressure（> 60 GPa）,the rise time of the load（～10 ns） and the strain(～10⁸ s^-1) are derived by the back-integrating method,and the reverberation of compression wave at the rear surface of the sample is observed.