百千安电流下的单丝Z箍缩实验研究

为更深层次理解Z箍缩基本物理过程，认识单丝早期演化对丝阵后续内爆过程产生的影响，基于百千安直线脉冲变压器（FLTD）平台开展了不同材料（钨丝、镀膜钨丝和铝丝）单丝Z箍缩实验研究，实验获得了单丝演化过程的双分幅激光阴影和干涉图像。实验发现：初始直径相同（15 μm）的条件下，铝丝核的膨胀速度比钨丝核的快，在电流开始一段时间内，铝丝核沿轴向呈均匀膨胀，而钨丝核因电极效应沿轴向膨胀不均；镀膜钨丝（15 μm W+2 μm Polyimide）核的膨胀速度远大于钨丝核的，甚至高于铝丝核的，同时镀膜还降低了消融等离子体不稳定性的发展速度。

Single WireZ-pinch Experiment with 100 kA Current

In order to understand the basic physics of wire array Z-pinch more clearly and learn more about the effect of single wire evolution to the wire array imploding, a series of single wire experiments were carried out on 100 kA fast linear transformer driver (FLTD) platform. Varieties of materials such as tungsten, coated tungsten and aluminum were studied in experiments. Two-frame laser shadowgraph and one interferogram were obtained during the evolution of single wire ablation. The results show that the wire core expansion rate of aluminum is faster than that of tungsten with the same initial wire diameter. The aluminum wire core expands uniformly along Z axis during the start of the driver current, while the tungsten wire core has a conical diameter from anode to cathode for polarity effect. The wire core expansion rate of coated tungsten (15 μm W+2 μm Polyimide) is much faster than that of tungsten, even faster than that of aluminum. In addition, wire coating helps reducing the speed of instability development of ablated plasma.