激光驱动气库靶对铝的准等熵压缩实验研究
Laser-driven reservoir target for quasi-isentropic compression in aluminum
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摘要: 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10~8s~(-1)并且观察到了压缩波在样品后表面的反射效应.Abstract: 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.
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