Effect of the high-voltage electrode polarity and wire preheating on the energy characteristics of electric explosion of fine tungsten wires in vacuum

A. G. Russkikh, R. B. Baksht, A. Yu Labetskiǐ, P. R. Levashov, S. I. Tkachenko, K. V. Khishchenko, A. V. Shishlov, A. V. Fedyunin, S. A. Chaǐkovskiǐ

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Abstract

Results are presented from experiments on the explosion of 30.5-μm tungsten wires at a current density of up to 140 MA/cm2 and resistive-heating time of 40-100 ns. The experiments were performed both with and without preheating of wires and at different polarities of the high-voltage electrode. The effect of plasma production at the electrodes on the initiation of breakdown along the exploding wire was investigated by using a frame camera. It is shown that, when the polarity of the high-voltage electrode is positive, breakdown begins with the formation of a bright spot on the wire surface near the cathode, whereas at the negative polarity, breakdown begins with the formation of bright spots on the cathode surface. A comparative analysis of the main characteristics of wire explosions is performed. It is shown that preheating of the conductor increases the resistive-heating time and, accordingly, the energy deposited in the wire core. This effect takes place during explosions of both single wires and wire arrays. The evolution of the state of a metal during the explosion (including melting and evaporation) is studied by one-dimensional simulations by using a semiempirical equation of state describing the properties of tungsten over a wide range of parameters.

Original languageEnglish
Pages (from-to)823-835
Number of pages13
JournalPlasma Physics Reports
Volume32
Issue number10
DOIs
Publication statusPublished - 1 Oct 2006
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Russkikh, A. G., Baksht, R. B., Labetskiǐ, A. Y., Levashov, P. R., Tkachenko, S. I., Khishchenko, K. V., ... Chaǐkovskiǐ, S. A. (2006). Effect of the high-voltage electrode polarity and wire preheating on the energy characteristics of electric explosion of fine tungsten wires in vacuum. Plasma Physics Reports, 32(10), 823-835. https://doi.org/10.1134/S1063780X06100035