Experiments are performed on the 'Qin-1' double pulse current generator at Xi'an Jiaotong University to study the effect of the prepulse current on the implosion dynamics of two-wire Z-pinches. An independent prepulse current with an adjustable time-delay (Tdelay) is introduced to preheat the wires before the start of the main pulse current. An estimation of the deposited energy and the areal density reconstructed from the interferogram suggest that the wires are partly vaporized with a gasification fraction of ~67%. The prepulse preconditioning has a redistribution effect on the load mass, which determines the subsequent implosion process. The planar implosion of the two-wire load with a preset Tdelay≤450 ns can be divided into the two-layer phase and the merged implosion phase. The snowplow-like implosion is the main characteristic of the shot with a 1050 ns Tdelay. The ablation streams gradually disappear with the increasing Tdelay. The proportion of the mass that participates in implosion increased as the preset Tdelay increases from 120 ns to 1050 ns.

中文翻译：

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具有可调时间延迟的预脉冲电流对两线 Z 型夹钳内爆动力学的影响

在西安交通大学的“Qin-1”双脉冲电流发生器上进行了实验，以研究预脉冲电流对两线 Z 型箍缩内爆动力学的影响。引入具有可调时间延迟 (Tdelay) 的独立预脉冲电流，以在主脉冲电流开始之前预热导线。从干涉图重建的沉积能量和面密度的估计表明，线部分汽化，气化率约为 67%。预脉冲预处理对载荷质量有重新分配作用，决定了后续的内爆过程。预设Tdelay≤450 ns的两线负载平面内爆可分为两层阶段和合并内爆阶段。类似扫雪车的内爆是具有 1050 ns Tdelay 的镜头的主要特征。随着 Tdelay 的增加，消融流逐渐消失。随着预设的 Tdelay 从 120 ns 增加到 1050 ns，参与内爆的质量比例增加。