Addressing the problem of plasma shell formation around an exploding wire in water

Grinenko, A.; Efimov, S.; Fedotov, A.; Krasik, Ya. E.; Schnitzer, I.

doi:10.1063/1.2202207

Cited by 39 publications

(18 citation statements)

References 21 publications

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“…The latter enables resistive heating to continue efficiently, while the expansion of the wire also drives a strong shock wave through the water, which itself can be used to access high pressure conditions. [5][6][7][8] Monitoring of the current through and voltage across exploding wires has long been used as a basis for resistivity measurements in warm dense matter conditions. However, understanding how the wire expands is crucial to the interpretation of this research.…”

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confidence: 99%

X-ray radiography of the overheating instability in underwater electrical explosions of wires

et al. 2019

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We present the measurements of the development of striation like instabilities during the electrical driven explosions of wires in a water bath. In vacuum based wire explosion experiments, such instabilities have long been known. However, in spite of intense research into the explosion of wires in liquids, the development of these instabilities has either not been observed or has been assumed to play a minor role in the parameters of the exploding wire due to the tamping of the wire's explosion. Using synchrotron based multiframe radiography, we have seen the development of platelike density structures along an exploding copper wire. Our measurements were compared to a 2D magnetohydrodynamics simulation, showing similar striation formation. These observed instabilities could affect the measurements of the conductivity of the wire material in the gas-plasma state-an important parameter in the warm dense matter community. The striations could also act as a seed for other instabilities later in time if the wire is in a dense flow of material or experiences a shock from an adjacent wire-as it would do in experiments with arrays of wires.

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confidence: 99%

X-ray radiography of the overheating instability in underwater electrical explosions of wires

et al. 2019

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“…12-15 this condition was fulfilled, and therefore the question why no evidence for the shunting water discharge was observed in Ref. 15 is answered. Presented results also indicate that, when more powerful generators, with a higher achievable wire heating rates than those used in Refs.…”

Section: Discussionmentioning

confidence: 91%

“…However, experiments described in Ref. 15, based on the analysis of the spectrum of the emitted radiation, indicate that no shunting plasma shell forms around the exploding wire.…”

Section: Introductionmentioning

confidence: 98%

Addressing water vaporization in the vicinity of an exploding wire

Grinenko

Gurovich

Krasik

et al. 2006

Journal of Applied Physics

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The phase state of thin (∼1μm) layer of water adjacent to the surface of rapidly heated thin wire 100±50μm in radius is analyzed by computer hydrodynamic calculation. It is shown that when heating of a wire to a temperature of 420°C is achieved in less than ∼500ns, the trajectory of the phase state is contained in the liquid part of the phase diagram. This suggests additional proof of and an explanation for the absence of shunting plasma discharge in fast underwater electrical wire explosions.

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“…In the case of the explosion of single wires in water, an energy density up to 500 eV/atom, pressure of $10 10 Pa, and temperature of a few eV were achieved inside the wires. 10 In the case of converging SW, the largest values of the pressure ( 6 Â 10 12 Pa), density ( 9 g/cm 3 ), and temperature ( 16 eV) of the water in the vicinity of the implosion were obtained for a spherical wire array explosion. 9 In these experiments, assuming spherical uniformity of the converging SW and self-similarity of the SW propagation in water, the value of pressure P SW versus the distance from the origin, i.e., radius R SW , increases as P SW / R À1:33 SW , due to fast decrease in the SW surface as S / R 2 SW : Mdivnishvili et al 11 suggested that using boundaries with a geometry providing faster decrease in the SW surface S / R 3 SW , the parameters (pressure, density, and temperature) of matter in the vicinity of the SW's convergence can be increased as compared with the case of a spherical SW implosion.…”

Section: Introductionmentioning

confidence: 94%

Shock wave convergence in water with parabolic wall boundaries

Yanuka

Shafer

Krasik

2015

Journal of Applied Physics

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The convergence of shock waves in water, where the cross section of the boundaries between which the shock wave propagates is either straight or parabolic, was studied. The shock wave was generated by underwater electrical explosions of planar Cu wire arrays using a high-current generator with a peak output current of $45 kA and rise time of $80 ns. The boundaries of the walls between which the shock wave propagates were symmetric along the z axis, which is defined by the direction of the exploding wires. It was shown that with walls having a parabolic cross section, the shock waves converge faster and the pressure in the vicinity of the line of convergence, calculated by two-dimensional hydrodynamic simulations coupled with the equations of state of water and copper, is also larger. V C 2015 AIP Publishing LLC. [http://dx.

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Addressing the problem of plasma shell formation around an exploding wire in water

Cited by 39 publications

References 21 publications

X-ray radiography of the overheating instability in underwater electrical explosions of wires

X-ray radiography of the overheating instability in underwater electrical explosions of wires

Addressing water vaporization in the vicinity of an exploding wire

Shock wave convergence in water with parabolic wall boundaries

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