Study of the strata formation during the explosion of a wire in vacuum

Rousskikh, A. G.; Oreshkin, V. I.; Chaikovsky, S. A.; Labetskaya, N. A.; Shishlov, A. V.; Beilis, I. I.; Baksht, R. B.

doi:10.1063/1.3000390

Cited by 77 publications

(35 citation statements)

References 19 publications

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“…Joule heat is released in a surface layer whose thickness is of the order of the skin depth, and so this mode is often referred to as a surface or an "ultrafast" mode. 2, 3 In the course of a fast EEC, thermal instabilities [6][7][8] (also referred to as overheat or electrothermal instabilities) develop, resulting in striations whether the current density is uniformly distributed [9][10][11][12] or skin effect takes place. [13][14][15][16][17] Criteria for a conductor explosion to occur in a uniform current mode are well known.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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“…We believe that the mechanism of strata formation in our experiments cannot be explained simply by R-T instabilities 12 or thermal instabilities. 13,14 Our future work will mainly focus on the modulation of instability development in single wire and z-pinch experiments.…”

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Influence of insulating coating on aluminum wire explosions

Yang

Sheng

et al. 2014

Physics of Plasmas

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Single wire explosions are widely used in understanding the early stages of z-pinch experiments. This paper presents a serial of experiments conducted on the pulse power generator with $1 kA peak current and $10 ns rising time in Xi'an Jiao Tong University. Polyimide coated aluminum wires and uncoated ones were tested under three different voltages to analyze the effect of insulating coating. Experimental results showed that insulating coating can increase the energy deposition 10%$30% in aluminum wires by delaying the voltage collapse and raising the maximum load resistance. The substantial energy deposition resulted in about 20% faster expansion rates for coated wires. Experimental evidence that plasma channel shunts the current from the wire core was observed by streak camera and schlieren graphs. This paper also briefly discussed the influence of nonuniform coating on the morphology of wire expansion. V C 2014 AIP Publishing LLC.

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“…[1][2][3][4] In the condensed state of metals where the electrical resistivity increases with temperature, electrothermal instabilities develop striations perpendicular to the flow of current. [5][6][7] Our interest in electrothermal instabilities primarily lies in pulsed power liner inertial confinement fusion (ICF) targets such as the recently proposed magnetized liner inertial fusion (MagLIF) concept. For this concept or any other pulsed power fusion concept to succeed, instability growth must be well understood and mitigated to acceptable levels determined by both simulations and experimental measurements.…”

Section: Introductionmentioning

confidence: 99%

Simulations of electrothermal instability growth in solid aluminum rods

Peterson

Sinars

et al. 2013

Physics of Plasmas

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A recent publication [K. J. Peterson et al., Phys. Plasmas 19, 092701 (2012)] describes simulations and experiments of electrothermal instability growth on well characterized initially solid aluminum and copper rods driven with a 20 MA, 100 ns rise time current pulse on Sandia National Laboratories Z accelerator. Quantitative analysis of the high precision radiography data obtained in the experiments showed excellent agreement with simulations and demonstrated levels of instability growth in dense matter that could not be explained by magneto-Rayleigh-Taylor instabilities alone. This paper extends the previous one by examining the nature of the instability growth in 2D simulations in much greater detail. The initial instability growth in the simulations is shown via several considerations to be predominantly electrothermal in nature and provides a seed for subsequent magneto-Rayleigh-Taylor growth.

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Study of the strata formation during the explosion of a wire in vacuum

Cited by 77 publications

References 19 publications

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

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

Influence of insulating coating on aluminum wire explosions

Simulations of electrothermal instability growth in solid aluminum rods

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