Skin explosion of double-layer conductors in fast-rising high magnetic fields

An experiment has been performed to study the electrical explosion of thick cylindrical conductors using the MIG pulsed power generator capable of producing a peak current of 2.5 MA within 100 ns rise time. The experimental goal was to compare the skin explosion of a solid conductor with that of a d...

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Bibliographic Details
Published in:Physics of plasmas 2014-04, Vol.21 (4)
Main Authors: Chaikovsky, S. A., Oreshkin, V. I., Datsko, I. M., Labetskaya, N. A., Ratakhin, N. A.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Conductors
CURRENT DENSITY
CYLINDRICAL CONFIGURATION
Electrical resistivity
Explosions
Flux density
MAGNETIC FIELDS
Magnetic induction
PEAKS
Plasma physics
PULSE RISE TIME
SURFACES
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Summary:An experiment has been performed to study the electrical explosion of thick cylindrical conductors using the MIG pulsed power generator capable of producing a peak current of 2.5 MA within 100 ns rise time. The experimental goal was to compare the skin explosion of a solid conductor with that of a double-layer conductor whose outer layer had a lower conductivity than the inner one. It has been shown that in magnetic fields of peak induction up to 300 T and average induction rise rate 3 × 109 T/s, the double-layer structure of a conductor makes it possible to achieve higher magnetic induction at the conductor surface before it explodes. This can be accounted for, in particular, by the reduction of the ratio of the Joule heat density to the energy density of the magnetic field at the surface of a double-layer conductor due to redistribution of the current density over the conductor cross section.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4871719