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

Journal Article · · Matter and Radiation at Extremes
DOI:https://doi.org/10.1063/1.5085487· OSTI ID:1574945
 [1];  [2];  [2];  [2];  [2];  [2]
  1. Russian Academy of Sciences (RAS), Moscow (Russian Federation); Lebedev/Cornell
  2. Russian Academy of Sciences (RAS), Moscow (Russian Federation)

The results of experiments with rapidly exploding thin conductors inthe current-pause regime are presented. Copper wires 25μm 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.

Research Organization:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003764
OSTI ID:
1574945
Journal Information:
Matter and Radiation at Extremes, Journal Name: Matter and Radiation at Extremes Journal Issue: 2 Vol. 4; ISSN 2468-2047
Publisher:
China Academy of Engineering Physics (CAEP)/AIP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Current Pause in Exploding‐Wire Discharges journal December 1967
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Electrical Characteristics of Microsecond Electrical Explosion of Cu Wires in Air Under Various Parameters journal April 2018
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Electric explosion of fine wires: Three groups of materials journal August 2015
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Cited By (3)

Application of quantum-statistical methods to studies of thermodynamic and radiative processes in hot dense plasmas journal September 2019
Multilayer weak shocks generated by restrike during underwater electrical explosion of Cu wires journal August 2019
Editorial for special issue on Z-pinches journal November 2019

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