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Polarity effect for exploding wires in a vacuum.

G S Sarkisov1, P V Sasorov, K W Struve

  • 1Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. gssarki@sandia.gov

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 22, 2002
PubMed
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The radial electric field significantly impacts energy deposition during metal wire electrical explosions. Positive polarity doubles deposited energy compared to negative polarity due to the field

Area of Science:

  • Plasma Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Electrical explosion of conductors is a key phenomenon in pulsed power applications.
  • Understanding energy deposition mechanisms is crucial for optimizing these processes.

Purpose of the Study:

  • To experimentally investigate the influence of the radial electric field on energy deposition during the electrical explosion of thin metal wires in vacuum.
  • To elucidate the role of the radial electric field in modifying energy deposition patterns and magnitudes.

Main Methods:

  • Thin metal wires were subjected to electrical explosion in a vacuum environment.
  • Varying polarity (positive and negative) was applied to the wires to establish different radial electric field configurations.
  • Energy deposition was measured and analyzed, focusing on its distribution along the wire axis.

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Main Results:

  • A strong influence of the radial electric field on energy deposition was experimentally confirmed.
  • Positive polarity, where the radial field drives electrons into the wire, resulted in approximately twice the deposited energy compared to negative polarity, where the field expels electrons.
  • The axial distribution of deposited energy was observed to change significantly with polarity.

Conclusions:

  • The radial electric field plays a critical role in governing energy deposition during wire electrical explosions.
  • The observed differences in energy deposition are attributed to the radial electric field's effects on electron emission and vapor breakdown along the wire surface.
  • These findings provide crucial insights for controlling and enhancing energy deposition in related physical phenomena.