Core structure and secondary breakdown of an exploding wire in the current-pause regime
- Russian Academy of Sciences (RAS), Moscow (Russian Federation); Lebedev/Cornell
- 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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