Calculation of heating and burst phenomena in electrically exploded foils

Logan, J. David; Lee, R. S.; Weingart, R.C.; Yee, K.S.

doi:10.1063/1.323646

Cited by 26 publications

(8 citation statements)

References 14 publications

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“…The magnetic contribution to the velocity was estimated by assuming infinite plane conductors and integrating the equation Wc + PmdmlX W (11) where p c , d c , and p m , d m are the density and thick ness of the foil and flyer material, respectively, X is the current per unit width calculated from Equation 1; H 0 is the permittivity of free space; and X is the acceleration of the foil and flyer. If the magnetic and hydrodynamic contributions to the flyer velocity are separable, subtracting the magnetic contribution from a measured velocity-time curve should leave the hydrodynamic contribution.…”

Section: Magnetic Acceleration Effects the Dependence Of Electrical Gmentioning

confidence: 99%

Electric gun: a new tool for ultrahigh-pressure research

Weingart¹,

Chau²,

Goosman³

et al. 1979

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We have developed a new tool for ultrahigh-pressure research at LLL. This system, which we call the electric gun, has already achieved thin flyer plate velocities in excess of 20 km/s and pressures of the order of 2 TPa in tantalum. We believe that the electric gun is competitive with laser-and nuclear-driven methods of producing shocks in the 1-to-S TPa range because of its precision and ease and economy of operation. We encourage its development for shock initiation studies, dry runs for Site 300 hydroshots, and as a shock wave generator for surface studies.

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Section: Magnetic Acceleration Effects the Dependence Of Electrical Gmentioning

confidence: 99%

Electric gun: a new tool for ultrahigh-pressure research

Weingart¹,

Chau²,

Goosman³

et al. 1979

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“…The traditional material of EFIs is copper, aluminum, gold, which has low melting temperature, high electrical resistivity. Researchers have made extensive investigations for metallic foil with high current pulse and accelerating flyer process, including experimental and simulation [10][11][12][13][14]. For the metallic foil process in high current pulse, it has been developed a magnetohydrodynamics (MHD) code to calculate the discharging current waveforms, voltage across the bridge foil region, plasma pressure, and flyer velocity.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Electrically Heated Exploding Foils in Reactive Al/Ni Multilayer

Wang

Sun

Jiang

et al. 2018

Propellants Explo Pyrotec

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The mechanisms of metal phase transition process during electrical explosion are experimentally and theoretically investigated. Past experiments of investigation are single metal foil, such as gold, aluminum, and copper. The characteristics of aluminum‐nickel (Al/Ni) multilayer foil were investigated, which means electrical behavior and energy output. The foil was fabricated by magnetron sputtering based on ceramic substrate, and lithographically patterned into bow‐tie bridge regions. Scanning electron microscopy characterization revealed the layer structure of the Al/Ni multilayer. X‐ray diffraction characterization was employed to ascertain the composition of Al/Ni. The probing of voltage‐current waveforms reveals that Al/Ni multilayer foils exhibit high voltage, short burst time and high absorbing energy in electrically heated in comparison with copper or nickel alone. We also measured the energy output of foils through velocity measurements of encapsulation layers ejected from bridge region by Photonic Doppler velocimetry. We observed flyer velocities from Al/Ni multilayer foil in the 1.6–2.9 km/s range, which is much higher than copper foil. Combined with the 1‐D non‐stationary acceleration model calculation, it is found that the chemical energy and increased electrical absorbing energy contributed to additional kinetic energy in the 40–80 mJ range.

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“…Currently, in most applications, the metal bridge foil connection area is generally a single bridge structure with an approximately square shape [2][3][4][5][6][7][8]. Many theoretical and experimental studies have been conducted on the influence of bridge material, size, and the corner shape of the bridge connection on the electrical explosion performance, and some valuable results have been obtained [9][10][11][12][13][14][15][16]. In other shape research conducted in the United States, Neyer et al [17] designed a ring bridge structure of a single bridge foil, and showed that the ring structure can produce a flatter flyer, which is more conducive to initiate the explosive.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of a plasma flow field produced by a metal array bridge foil explosion

Wu¹,

Wang²,

Li³

et al. 2018

Plasma Sci. Technol.

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To improve the energy utilization efficiency of metal bridge foil explosion, and increase the function range of plasmas, array bridge foil explosion experiments with different structures were performed. A Schlieren photographic measurement system with a double-pulse laser source was used to observe the flow field of a bridge foil explosion. The evolution laws of plasmas and shock waves generated by array bridge foil explosions of different structures were analyzed and compared. A multi-phase flow calculation model was established to simulate the electrical exploding process of a metal bridge foil. The plasma equation of state was determined by considering the effect of the changing number of particles and Coulomb interaction on the pressure and internal energy. The ionization degree of the plasma was calculated via the Saha-Eggert equation assuming conditions of local thermal equilibrium. The exploding process of array bridge foils was simulated, and the superposition processes of plasma beams were analyzed. The variation and distribution laws of the density, temperature, pressure, and other important parameters were obtained. The results show that the array bridge foil has a larger plasma jet diameter than the single bridge foil for an equal total area of the bridge foil. We also found that the temperature, pressure, and density of the plasma jet's center region sharply increase because of the superposition of plasma beams.

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Calculation of heating and burst phenomena in electrically exploded foils

Cited by 26 publications

References 14 publications

Electric gun: a new tool for ultrahigh-pressure research

Electric gun: a new tool for ultrahigh-pressure research

Investigation of Electrically Heated Exploding Foils in Reactive Al/Ni Multilayer

Characteristics of a plasma flow field produced by a metal array bridge foil explosion

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