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Effect of current rate on energy deposition into exploding metal wires in vacuum

机译:电流速率对真空中爆炸金属丝中能量沉积的影响

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This paper presents direct experimental proof of a significant increase of energy deposition into a metal core before voltage breakdown with the current rate for nanosecond exploding wires in a vacuum. This effect is demonstrated for nine different refractory and nonrefractory metals. The strongest influence of current rate was demonstrated for tungsten wires. Increasing the current rate from 20 to 150 As changes the wire core from a solid to a cluster-like state. For nonrefractory metals such as Ag, Al, Cu, and Au, fast explosion allows deposition inside a metal core 1.5-2.9 times the atomization enthalpy before voltage breakdown. The slow explosion, with 20 As, gives 2-3 times less energy deposition before voltage breakdown than the fast-explosion mode. The current-rate effect is important for optimization of wire ablation, reduction of the mass left behind in the wire-array load, and final x-ray yield in modern multi-MA wire-array Z-pinch facilities. (C) 2004 American Institute of Physics.
机译:本文提供了直接的实验证明,即在电压击穿之前,随着真空中纳秒级爆炸导线的电流速率,能量沉积到金属芯中的能量显着增加。对于九种不同的难熔金属和非难熔金属证明了这种效果。电流速率对钨丝的影响最大。将电流速率从20 A / ns增加到150 A / ns会将线芯从固态变为簇状。对于非难熔金属,例如Ag,Al,Cu和Au,快速爆炸允许在电压击穿之前在金属芯内部沉积雾化焓的1.5-2.9倍。与快速爆炸模式相比,电压为20 A / ns的缓慢爆炸在电压击穿之前产生的能量沉积少2-3倍。电流速率效应对于优化线烧蚀,减少线阵列负载中遗留的质量以及现代多MA线阵列Z压紧装置的最终X射线产量非常重要。 (C)2004美国物理研究所。

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