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 is increased as the preset Tdelay increases from 120 ns to 1050 ns.
西安交通大学在“秦-1”双脉冲电流发生器上进行了实验，以研究预脉冲电流对双丝Z箍缩内爆动力学的影响。在主线电流脉冲开始之前，引入了一路具有可调时间延迟（Tdelay）的独立预脉冲电流，用于对金属丝进行预热。对沉积能量的估算以及由干涉图重建的密度分布表明，金属丝发生了部分汽化，汽化比例约为67%。预脉冲预处理对负载质量产生了重新分布效应，这决定了后续的内爆过程。当预设的Tdelay ≤ 450 ns时，双丝负载的平面内爆可分为两相：双层阶段和合并内爆阶段。当Tdelay为1050 ns时，雪铲式内爆是其主要特征。随着Tdelay的增大，烧蚀流逐渐消失。当预设的Tdelay从120 ns增大到1050 ns时，参与内爆的质量比例随之增加。