Study of the core-corona structure formed during the explosion of an aluminum wire in vacuum

Ткаченко, С. И.; Mingaleev, A. R.; Pikuz, S. A.; Romanova, V. M.; Khattatov, T. A.; Shelkovenko, T.A.; Olkhovskaya, O. G.; Gasilov, V. A.; Kalinin, Yu. G.

doi:10.1134/s1063780x11120105

Cited by 31 publications

(16 citation statements)

References 16 publications

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“…The experimental data on the plasma emissivity in various spectral ranges obtained by Tkachenko et al [165], [187] (see Fig. 26) allowed them to make some conclusions on the composition of the plasmas produced by WEs in vacuum.…”

Section: Radiation From Exploding Wire Plasmas In Vacuummentioning

confidence: 95%

“…13(b)] shows bright [190], AND THE RESISTIVITY IS TAKEN FROM [191] Fig The corona and the core of an exploded wire can be clearly seen in Fig. 14 [187]. Figure 14 were taken 155 ns after the onset of current flow through the wire (the energy deposition to the wire proceeded within t res ∼ 120 ns).…”

Section: A Deposited Energymentioning

confidence: 99%

“…The evolution of the visible and UV emission from exploding wire plasmas was investigated by Wu et al [175], Sarkisov et al [176], and Tkachenko et al [187]. Let us consider, using the data for exploded 25-μm Al wires [187] as an example, how the emission varies with time. Fig.…”

Section: Radiation From Exploding Wire Plasmas In Vacuummentioning

confidence: 99%

“…As pointed out in Section II-A, the current rate is determined by the parameters of the generator loaded with the exploding wire and by the wire material and geometric dimensions. In most experiments with wires exploded in vacuum [175], [176], [187], a nonmonotonic increase in radiation intensity J (t) with current was observed [see Fig. 26(b)]: the first short emission spike was followed by a rather long-lasting emission, which intensified as the discharge channel expanded.…”

Section: Radiation From Exploding Wire Plasmas In Vacuummentioning

confidence: 99%

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Wire Explosion in Vacuum

Oreshkin

Baksht

2020

IEEE Trans. Plasma Sci.

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This article presents a review of experimental and theoretical studies devoted to the processes that occur during explosions of wires in vacuum when the current densities in the wire are of the order of 10 8 A/cm 2 and the current density rise rates are no less than 10 15 A/(cm 2 • s). The theoretical background is focused on the transformation of the wire metal into ionized plasma. In particular, the basic physical notions used to describe wire explosions (WEs; state diagram, current action integral, and metal conductivity changes in phase transitions) are given; magnetohydrodynamic equations are described which are used to simulate WEs, and the simulation predictions are discussed together with their reliability. Extensive experimental data on WEs in vacuum are presented which made it possible to describe the corona and core formation and the development of electrothermal instabilities in the core. The data on the energy deposited in a wire exploding in vacuum reported by different authors are compared. In conclusion, problems are discussed that require additional experimental investigations, namely, the role of metastable states in a WE and the mechanism by which the core is shunted.

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Section: Radiation From Exploding Wire Plasmas In Vacuummentioning

confidence: 95%

Section: A Deposited Energymentioning

confidence: 99%

Section: Radiation From Exploding Wire Plasmas In Vacuummentioning

confidence: 99%

Section: Radiation From Exploding Wire Plasmas In Vacuummentioning

confidence: 99%

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Wire Explosion in Vacuum

Oreshkin

Baksht

2020

IEEE Trans. Plasma Sci.

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“…After the current cutoff in the wire, the magnetic pressure disappears, and the highly-pressurized material of wire begins to expand freely. To perform an SPH simulation test for this expansion stage only, we use the initial conditions provided by magnetohydrodynamic modeling of an aluminum wire [29].…”

Section: Parallel Performance In Dynamic Tests With Materials In Extrmentioning

confidence: 99%

Parallel SPH modeling using dynamic domain decomposition and load balancing displacement of Voronoi subdomains

Егорова

Dyachkov

Паршиков

et al. 2019

Computer Physics Communications

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A highly adaptive load balancing algorithm for parallel simulations using particle methods, such as molecular dynamics and smoothed particle hydrodynamics (SPH), is developed. Our algorithm is based on the dynamic spatial decomposition of simulated material samples between Voronoi subdomains, where each subdomain with all its particles is handled by a single computational process which is typically run on a single CPU core of a multiprocessor computing cluster.The algorithm displaces the positions of neighbor Voronoi subdomains in accordance with the local load imbalance between the corresponding processes. It results in particle transfers from heavy-loaded processes to less-loaded ones. Iteration of the algorithm puts into alignment the processor loads. Convergence to a well-balanced decomposition from imbalanced one is improved by the usage of multi-body terms in the balancing displacements.The high adaptability of the balancing algorithm to simulation conditions is illustrated by SPH modeling of the dynamic behavior of materials under extreme conditions, which are characterized by large pressure and velocity gradients, as a result of which the spatial distribution of particles varies greatly in time. The higher parallel efficiency of our algorithm in such conditions is demonstrated by comparison with the corresponding static decomposition of the computational domain. Our algorithm shows almost perfect strong scalability in tests using from tens to several thousand processes.

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Transforming dielectric coated tungsten and platinum wires to gaseous state using negative nanosecond-pulsed-current in vacuum

Wang

et al. 2014

Physics of Plasmas

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With the help of thin dielectric coatings, corona free explosions were achieved in the region of about half a wire length (2 cm) for tungsten wires and nearly the whole wire length for platinum wires under a fast rising (46–170 A/ns) negative polarity current in vacuum. Expansion velocity of the tungsten gas was over 10 km/s. Current waveforms from exploding coated wires were similar to those from bare wires in the air including a current pause stage. Coated wires with different coating parameters had a similar joule energy deposition before voltage collapsed, but a quite different scenario in the region near the electrodes. The axial field under negative current was the main reason for the axial inhomogeneity of coated tungsten wires. Tungsten or platinum gases in the vaporized region were tightly encompassed by the dielectric coating, while gaps or probably low density gases, were observed between the coating and the edge of the dense wire core in the core-corona structure region.

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Study of the core-corona structure formed during the explosion of an aluminum wire in vacuum

Cited by 31 publications

References 16 publications

Wire Explosion in Vacuum

Wire Explosion in Vacuum

Parallel SPH modeling using dynamic domain decomposition and load balancing displacement of Voronoi subdomains

Transforming dielectric coated tungsten and platinum wires to gaseous state using negative nanosecond-pulsed-current in vacuum

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