Investigation of Shock Wave Loading and Crater Creation by Means of Single and Double Targets in the PALS-Laser Experiment
Investigation of Shock Wave Loading and Crater Creation by Means of Single and Double Targets in the PALS-Laser Experiment
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PALS 激光实验中单靶和双靶冲击波载荷和弹坑形成的研究
DOI：
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发表时间：
2005
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通讯作者：
J. Ullschmied
中科院分区：
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作者：
S. Gus'kov;S. Borodziuk;M. Kalal;A. Kasperczuk;V. N. Kondrashov;J. Limpouch;P. Pisarczyk;T. Pisarczyk;K. Rohlena;J. Skála;J. Ullschmied
研究了不同类型的铝靶，即单重靶和由箔或盘组成的双靶在选定的距离（300和500 μm）处放置在重靶之前的弹坑创建效率。目标由帕尔斯设施激光束照射，EL = 100 - 400 J，第一谐波λ = 1315 nm，焦斑半径为125 µm，脉冲持续时间为400 ps。用三帧干涉法测量了加速箔碎片或圆盘的速度和等离子体流的电子密度分布。利用陨石坑复型技术和显微镜测量获得了陨石坑的体积和体积。结果表明，激光直接作用是向大质量靶传递能量的最有效方式，也是产生凹坑的最有效方法。与直接激光作用相比，在双目标的情况下，能量通过碰撞激光驱动的箔或盘转移到大质量目标，发现冲击波加载和弹坑创建的效率略低。这样的碰撞能量转移的效率是接近60%的箔和40%的磁盘。实验结果与激光直接作用下和激光驱动大颗粒碰撞下产生冲击波的二维流体力学模型符合得很好。
The efficiency of crater creation for different types of Al targets, namely, single massive targets and double targets consisting of a foil or a disk placed before the massive target at a chosen distance (300 and 500 µm), is studied. Targets were irradiated by the PALS facility laser beam with EL = 100 – 400 J at the first harmonic λ = 1315 nm, a focal spot radius of 125 µm, and pulse duration of 400 ps. Velocities of the accelerated foil’s fragments or disks and electron density distributions of the plasma streams are determined by means of three-frame interferometry. Shapes and volumes of craters are obtained using the crater replica technology and microscopy measurements. It is shown that direct laser action is the most efficient way of energy transfer to the massive target and the most efficient method of crater creation. Somewhat lower efficiencies of shock wave loading and crater creation in comparison with direct laser action are found in the case of double targets where the energy is transferred to the massive target by colliding laser-driven foils or disks. The efficiencies of such a colliding energy transfer are close to 60% for foils and 40% for disks. The experimental results are in a good agreement with two-dimensional hydrodynamic models of shock wave generation under direct laser action and laser-driven macroparticle impact.