Magnetically driven hyper-velocity launch capability at the Sandia Z accelerator
Magnetically driven hyper-velocity launch capability at the Sandia Z accelerator
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DOI：
10.1016/j.ijimpeng.2010.10.019
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发表时间：
2011-06-01
影响因子：
5.1
通讯作者：
Davis, J-P
中科院分区：
文献类型：
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作者：
Lemke, R. W.;Knudson, M. D.;Davis, J-P
桑迪亚国家实验室的Z加速器产生的强磁场被用作材料科学研究的压力源。可以在类似于100-600 ns的时间尺度上向实验中使用的负载输送类似于20 MA的电流。在平面结构中已经产生了超过1200 T（600 GPa）的磁场（压力）。在我们已经开发的一个应用中，磁压力在板冲击实验中将飞片发射到超高速;在冲击压缩到多兆巴压力的材料的Hugoniot上获得状态方程数据。这种能力已得到加强，最近开发的平面带状线配置，增加了磁压力为一个给定的电流。此外，带状线飞片的横截面积大于以前的同轴负载;这提高了飞片的平面度，从而降低了测量的不确定性。给出了超高速铝和铜飞片的实验和多维磁流体动力学（MHD）模拟结果。尺寸类似于25 mm ×类似于13 mm ×类似于1 mm的铝飞片已被发射至高达类似于45 km/s的速度;对于铜，峰值速度类似于22 km/s。这些结果的重要性在于，飞片材料的一部分在与目标撞击时保持固体;通过使动态压力（电流）斜坡成形使得飞片准等熵地压缩（即，在加速过程中，出版社：Elsevier Ltd
The intense magnetic field generated by the Z accelerator at Sandia National Laboratories is used as a pressure source for material science studies. A current of similar to 20 MA can be delivered to the loads used in experiments on a time scale of similar to 100-600 ns. Magnetic fields (pressures) exceeding 1200 T (600 GPa) have been produced in planar configurations. In one application we have developed, the magnetic pressure launches a flyer plate to ultra-high velocity in a plate impact experiment; equation of state data is obtained on the Hugoniot of a material that is shock compressed to multi-megabar pressure. This capability has been enhanced by the recent development of a planar stripline configuration that increases the magnetic pressure for a given current. Furthermore, the cross sectional area of a stripline flyer plate is larger than in previous coaxial loads; this improves the planarity of the flyer thereby reducing measurement uncertainty. Results of experiments and multi-dimensional magneto hydrodynamic (MHD) simulation are presented for ultra-high velocity aluminum and copper flyer plates. Aluminum flyer plates with dimensions similar to 25 mm by similar to 13 mm by similar to 1 mm have been launched to velocities up to similar to 45 km/s; for copper the peak velocity is similar to 22 km/s. The significance of these results is that part of the flyer material remains solid at impact with the target; an accomplishment that is made possible by shaping the dynamic pressure (current) ramp so that the flyer compresses quasi-isentropically (i.e., shocklessly) during acceleration. Published by Elsevier Ltd.