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

Russkikh, A.; Baksht, R.; Labetskii, A.; Levashov, P.; Tkachenko, S.; Khishchenko, K.; Shishlov, A.; Fedyunin, A.; Chaikovskii, S.
October 2006
Plasma Physics Reports;Oct2006, Vol. 32 Issue 10, p823
Academic Journal
Results are presented from experiments on the explosion of 30.5-�m 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.


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