Core structure and secondary breakdown of an exploding wire in the current-pause regime

Romanova V. M.; Mingaleev A. R.; Ter-Oganesyan A. E.; Shelkovenko T. A.; Ivanenkov G. V.; Pikuz S. A.

doi:10.1063/1.5085487

Volume 4 Issue 2

Mar. 2019

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Romanova V. M., Mingaleev A. R., Ter-Oganesyan A. E., Shelkovenko T. A., Ivanenkov G. V., Pikuz S. A.. Core structure and secondary breakdown of an exploding wire in the current-pause regime[J]. Matter and Radiation at Extremes, 2019, 4(2): 026401. doi: 10.1063/1.5085487

Citation:

Romanova V. M., Mingaleev A. R., Ter-Oganesyan A. E., Shelkovenko T. A., Ivanenkov G. V., Pikuz S. A.. Core structure and secondary breakdown of an exploding wire in the current-pause regime[J]. Matter and Radiation at Extremes, 2019, 4(2): 026401. doi: 10.1063/1.5085487

Citation:

Romanova V. M., Mingaleev A. R., Ter-Oganesyan A. E., Shelkovenko T. A., Ivanenkov G. V., Pikuz S. A.. Core structure and secondary breakdown of an exploding wire in the current-pause regime[J]. Matter and Radiation at Extremes, 2019, 4(2): 026401. doi: 10.1063/1.5085487

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Core structure and secondary breakdown of an exploding wire in the current-pause regime

doi: 10.1063/1.5085487

P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53, Leninskiy pr., 119991, Moscow, Russia

Received Date: 2018-06-26
Accepted Date: 2018-09-11

Available Online: 2021-04-13

Publish Date: 2019-03-15

Abstract

Abstract

The results of experiments with rapidly exploding thin conductors in the current-pause regime are presented. Copper wires 25 μm in diameter and 12 mm in length serve as loads for a GVP pulsed generator based on a low-inductance capacitor. The generator produces current pulses of up to 10 kA with dI/dt up to 50 A/ns. A 100–800-ns current-pause regime is obtained for charging voltages of 10–15 kV. The discharge channel structure is studied by shadow photography using 0.53-μm, 10-ns second-harmonic pulses from a Nd³⁺:YAG laser. In the experiments, three types of secondary breakdown are observed, with different symmetry types, different current-pause durations, and different dependences on the energy deposited into the wire during its resistive heating. All of these breakdown types develop inside a tubular core that is produced in the current-pause stage and that remains almost undamaged by the breakdown.

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References(20)

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