Suppressing the asymmetrical structures of the wire array Z-pinch
Suppressing the asymmetrical structures of the wire array Z-pinch
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DOI：
10.1109/deiv.2016.7764024
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发表时间：
2016-09
期刊：
影响因子：
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通讯作者：
J. Wu;S. Jia;A. Qiu
中科院分区：
文献类型：
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作者：
J. Wu;S. Jia;A. Qiu
通过施加快速上升的预脉冲电流和使用绝缘涂层来抑制线阵Z箍缩的这些不对称结构，进行了一系列的实验。单线或多线阵列负载通过一组具有高时间和空间分辨率的诊断来研究，包括激光探测，高速摄影等。在1 kA， 100 a /ns的电流下，使用2 ~ 3 μ m厚度的介质涂层可以实现铝丝和钨丝的无电晕爆炸。然后这些金属蒸汽在真空中自由膨胀，两个相邻的柱相互碰撞，在导线中间形成一个停滞区，而不是一个均匀的气壳。在介质涂层的帮助下，在100ka设备上钨丝的烧蚀和前体等离子体得到了极大的抑制。基于上述实验结果，设计并搭建了双脉冲发生器“秦-1”装置（预脉冲为10 kA，主脉冲为1 MA），并对预置导线阵z捏缩的内爆和滞止阶段进行了实验。
A series of experiments have been carried out to suppress these asymmetrical structures of the wire-array Z pinch by applying a fast rising prepulse current and using insulated coatings. The single wire or a multiwire array load is investigated by a set of diagnostics with high temporal and spatial resolution including laser probing, high speed photography, and etc. Under a 1 kA, 100 A/ns current, corona free explosions of aluminum and tungsten wires are fulfilled by using the 2-3 μ m thickness dielectric coatings. Then these metallic vapors expand freely in the vacuum and two neighboring columns collide with each other, forming a stagnation region in the middle of the wires rather than a uniform gas shell. With the help of dielectric coatings, ablation and precursor plasmas are greatly suppressed for tungsten wires on a 100 kA facility. Based on the experimental results above, a dual-pulse generator “Qin-1” facility (a 10 kA prepulse and a 1 MA main pulsed) is designed and built up, and experiments on the implosion and stagnation stage of the preconditioned wire array Z-pinch will be conducted.