Numerical calculation of the current specific action integral at the electrical explosion of wires

Oreshkin, V. I.; Barengolts, S. A.; Chaikovsky, S. A.

doi:10.1134/s1063784207050179

Cited by 57 publications

(21 citation statements)

References 9 publications

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“…This is supported by the results of simulations of exploding conductors [9]. It was supposed [10] that the same takes place in a CS cell, where an explosion of the cathode metal occurs.…”

Section: The Model Of Connection Of Thermal and Electric Propertiesmentioning

confidence: 72%

Critical Point Parameters and Cathode Spot Cells in Vacuum Arcs

Mesyats

Tsventoukh

2015

IEEE Trans. Plasma Sci.

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This paper presents a model for the estimation of specific parameters of vacuum arc cathode spot (CS) explosive cells. It involves the reactive force accelerating ions from the spot cell, what is known as the Tanberg effect, and the assumption that the average state of matter during the explosion is near the liquid-gas (plasma) critical point. Specifying the ions' velocity and erosion rate known from measurements, and the critical pressure, one can estimate the average current density at the CS cell to be about 100 MA/cm 2 for most of the materials considered.

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“…This is supported by the results of simulations of exploding conductors [9]. It was supposed [10] that the same takes place in a CS cell, where an explosion of the cathode metal occurs.…”

Section: The Model Of Connection Of Thermal and Electric Propertiesmentioning

confidence: 72%

Critical Point Parameters and Cathode Spot Cells in Vacuum Arcs

Mesyats

Tsventoukh

2015

IEEE Trans. Plasma Sci.

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“…EEC modes are conventionally classified according to the proportions between the time of energy delivery to the conductor and the characteristic times of hydrodynamic instability growth, of magnetic diffusion into the conductor, etc. [1][2][3][4] In a slow explosion mode, which takes place at current densities lower than 10 7 A/cm 2 , the magnetic field pressure has time to change the shape of the conductor, as the time of energy delivery is longer than the characteristic growth time of sausage or kink hydrodynamic instabilities. 1,5 A fast EEC, which takes place at higher current densities, can occur either in a volumetric mode with the current density uniformly distributed over the conductor cross section or in a skin-effect mode.…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15][16][17] Criteria for a conductor explosion to occur in a uniform current mode are well known. For this case, the main parameter is the integral of specific current action 3,4,18,19 h ¼…”

Section: Introductionmentioning

confidence: 99%

“…The specific action integrals h melt and h expl for a given material are, to a good approximation, constant over a wide range of current densities. 4,19 It should be noted that the specific action integral h is evaluated for a conductor cross section close to the original one, and this, strictly speaking, is not reasonable, especially for conductors of small cross section. Nevertheless, this criterion works well in cases where the current density distribution is uniform.…”

Section: Introductionmentioning

confidence: 99%

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Skin explosion of double-layer conductors in fast-rising high magnetic fields

et al. 2014

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Articles you may be interested inDesign of pulsed guiding magnetic field for high power microwave generators Rev. Sci. Instrum. 85, 094703 (2014); 10.1063/1.4894204 Fast modeling of flux trapping cascaded explosively driven magnetic flux compression generators Rev. Sci. Instrum. 84, 014703 (2013); 10.1063/1.4775488Electrical explosion of metals in fast-rising megagauss magnetic fields An experiment has been performed to study the electrical explosion of thick cylindrical conductors using the MIG pulsed power generator capable of producing a peak current of 2.5 MA within 100 ns rise time. The experimental goal was to compare the skin explosion of a solid conductor with that of a double-layer conductor whose outer layer had a lower conductivity than the inner one. It has been shown that in magnetic fields of peak induction up to 300 T and average induction rise rate 3 Â 10 9 T/s, the double-layer structure of a conductor makes it possible to achieve higher magnetic induction at the conductor surface before it explodes. This can be accounted for, in particular, by the reduction of the ratio of the Joule heat density to the energy density of the magnetic field at the surface of a double-layer conductor due to redistribution of the current density over the conductor cross section. V C 2014 AIP Publishing LLC.

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“…We simulated an explosion in terms of a single temperature magnetohydrodynamic (MHD) approxi mation using the MHD EXWIRE software package [7,8]. In the case of cylindrical geometry, MHD equa tions have the form…”

Section: Simulation Of An Explosionmentioning

confidence: 99%

Phase transformations of carbon under extreme energy action

et al. 2012

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Experiments are performed on a high current MIG generator (current amplitude 2.5 MA, current rise time 100 ns) to synthesize diamond like carbon forms. Magnetohydrodynamic calculations carried out before the experiments show that the conditions required for synthesizing diamond like structures appear during the compression of copper tubes 2-4 mm in diameter filled with graphite. The explosion products are analyzed on an EM 125 diffraction transmission electron microscope. During an explosion, the entire graph ite is found to transform into cubic carbon: crystals with the simple cubic lattice and a lattice parameter a = 0.5545 nm and with the face centered cubic lattice and a = 0.3694 nm are detected. The crystallite size is 5-25 nm.

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Numerical calculation of the current specific action integral at the electrical explosion of wires

Cited by 57 publications

References 9 publications

Critical Point Parameters and Cathode Spot Cells in Vacuum Arcs

Critical Point Parameters and Cathode Spot Cells in Vacuum Arcs

Skin explosion of double-layer conductors in fast-rising high magnetic fields

Phase transformations of carbon under extreme energy action

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