Experimental Studies of Hollow Structure Formed in the Dense Core of Exploded Wires

Pikuz, S. A.; Shelkovenko, T. A.; Hoyt, C. L.; Douglass, J. D.; Tilikin, I. N.; Mingaleev, A. R.; Romanova, V. M.; Hammer, D. A.

doi:10.1109/tps.2015.2440101

Cited by 12 publications

(3 citation statements)

References 32 publications

(26 reference statements)

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“…It is natural to suppose that such a core has a tubular (the simplest possible) structure: the dense cylindrical shell makes it nontransparent for the probing radiation, while the inner cavity is filled with lowdensity vapor. This agrees well with the results of experiments in which similar tubular structures were observed [10].…”

Section: Core Structure For Different Explosion Scenariossupporting

confidence: 93%

“…In addition, it turned out that, in many cases, the core has a more complicated structure consisting of a dense-wall tube filled with a low-density vaporous substance (Fig. 2b) [10]. Such a tubular (hollow) structure of the wire cores was also observed in laser shadowgraphs recorded in experiments on nanosecond wire explosions in air with a current pause [11].…”

Section: Plasma Dynamicsmentioning

confidence: 81%

“…2. X-ray shadow images of different types of wire cores: (a) foam-like core formed during an electric explosion of a nickel wire (d 0 = 25 μm, ХР generator, U 0 = 300 kV, I wire = 240 kA) [9], (b) tubular cores formed during an explosion of a ten-wire palladium array (d 0 = 25 μm, COBRA generator, I wire = 150 kA) [10], and (c) porous shell formed during an explosion of a tungsten wire (d 0 = 13 μm, LC1 generator, U 0 = 15 kV, I wire = 3 kA) [ bations) develop faster. The more intensive process of explosion in metals of the copper group (as compared to that in metals of the tungsten group) is usually explained by the larger energy deposited in the wire during the current pulse.…”

Section: Concept Of Two Groups Of Materials In Eew Experimentsmentioning

confidence: 99%

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Electric explosion of fine wires: Three groups of materials

et al. 2015

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Experimental data demonstrating differences in the structures of channels formed during nanosecond discharges through fine wires made of different materials are presented. In addition to the traditional two classes of metals and alloys (the copper and tungsten groups), a new class is proposed to which materials of the nickel type belong. Their properties combine the characteristic properties of the two traditional groups, due to which they occupy an intermediate position between the latter. This manifests itself in the unstable character of explosion, the type of which can change drastically when changing the ambient medium or other conditions. Most of the reported results were obtained at a small setup with maximum values of the current and voltage of 10 kA and 20 kV, respectively, the current rise time being about 300 ns. An attempt is made to construct a scenario of the development of a nanosecond explosion that would make it possible to qualitatively describe the formation of the discharge channel structure. The analysis is based on the recent experimental results indicating that the cores formed in the course of the discharge have a tubular structure.

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Section: Core Structure For Different Explosion Scenariossupporting

confidence: 93%

Section: Plasma Dynamicsmentioning

confidence: 81%

Section: Concept Of Two Groups Of Materials In Eew Experimentsmentioning

confidence: 99%

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Electric explosion of fine wires: Three groups of materials

et al. 2015

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Study of density distribution of electrical exploding tungsten wire in air

Shi

et al. 2018

Physics of Plasmas

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The density distribution is important information in the investigation of electrical exploding wires in the air. In this study, the density profiles of the electrons, tungsten atoms, and air at different instants were reconstructed based on a two-wavelength interferometry method. The experiment was carried out on a 1 kA, 0.1 kA/ns pulsed current generator, with a fine tungsten wire (10 μm in diameter). The laser probing images of the exploding products showed a two-layer structure, exhibiting a shunting discharge scenario. The fitted expanding trajectory of the dense core indicates that the expansion of the wire starts at the instant of the voltage drop. The reconstructed densities show the distribution of particles in the expansion process of the exploding wire. It is found that the wire core has a tube-like structure, and the plasma channel is located around the core boundary.

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On the phase state of thin silver wire cores during a fast electric explosion

et al. 2018

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The results of laser (shadow and interferometric) studies of thin silver wire cores during a nanosecond electric explosion in vacuum are presented. Experiments were performed with a small Micro-4 generator (the charge voltage is 20 kV, and the current rise rate is 100 A/ns). The analysis of the data obtained showed that, despite a considerable energy deposition (a few atomization energies) into matter at the resistive stage of the discharge, a conductor is not completely evaporated. This is related to the features of the metal–dielectric transition which occurs nonuniformly in different load regions. Processes proceeding in the case of a rapid energy deposition to a conductor are qualitatively interpreted. It was shown that in this case the bond energy as the unit of measurement of the deposited energy is more appropriate than the energy of atomisation.

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Experimental Studies of Hollow Structure Formed in the Dense Core of Exploded Wires

Abstract: Complex hollow structures have been observed in the cores of single exploded wires and multiwire arrays using high-resolution X-ray radiography and laser probing. The radiographs show features supporting earlier research that suggested the core is a foamlike liquid-vapor mixture.

Cited by 12 publications

References 32 publications

Electric explosion of fine wires: Three groups of materials

Electric explosion of fine wires: Three groups of materials

Study of density distribution of electrical exploding tungsten wire in air

On the phase state of thin silver wire cores during a fast electric explosion

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