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

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

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摘要

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.

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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DOI:10.1063/1.5085487

所屬欄目:MAGNETIC DRIVEN FUSIONResearch Articles

收稿日期:2018-06-26

修改稿日期:2018-09-11

網絡出版日期:2019-06-27

作者單位    點擊查看

V. M. Romanova:P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53, Leninskiy pr., 119991, Moscow, Russia
A. R. Mingaleev:P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53, Leninskiy pr., 119991, Moscow, Russia
A. E. Ter-Oganesyan:P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53, Leninskiy pr., 119991, Moscow, Russia
T. A. Shelkovenko:P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53, Leninskiy pr., 119991, Moscow, Russia
G. V. Ivanenkov:P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53, Leninskiy pr., 119991, Moscow, Russia
S. A. Pikuz:P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53, Leninskiy pr., 119991, Moscow, Russia

聯系人作者:V. M. Romanova

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引用該論文

V. M. Romanova, A. R. Mingaleev, A. E. Ter-Oganesyan, T. A. Shelkovenko, G. V. Ivanenkov, S. A. Pikuz. Core structure and secondary breakdown of an exploding wire in the current-pause regime[J]. Matter and Radiation at Extremes, 2019, 4(2): 5085487

V. M. Romanova, A. R. Mingaleev, A. E. Ter-Oganesyan, T. A. Shelkovenko, G. V. Ivanenkov, S. A. Pikuz. Core structure and secondary breakdown of an exploding wire in the current-pause regime[J]. Matter and Radiation at Extremes, 2019, 4(2): 5085487

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