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Exploding wire energy absorption dynamics at slow current rates

Published online by Cambridge University Press:  05 December 2016

G. Rodríguez Prieto ,
L. Bilbao  and
M. Milanese
G. Rodríguez Prieto*
Affiliation:
Universidad de Castilla-la Mancha, I.N.E.I., 13071, Ciudad Real, Spain
L. Bilbao
Affiliation:
Instituto de Física del Plasma, UBA-CONICET, 1428, Buenos Aires, Argentina
M. Milanese
Affiliation:
CONICET, Universidad Nacional del Centro de la Provincia de Buenos Aires, Instituto de Física Arroyo Seco – Facultad de Ciencias Exactas 7000, Tandil, Argentina
*
Address correspondence and reprint requests to: G. Rodríguez Prieto, Universidad de Castilla-la Mancha, I.N.E.I., 13071, Ciudad Real, Spain. E-mail: gonzalo.rprieto@uclm.es
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Abstract

Absorption of electrical energy provided to a metal wire in an exploding wire system is thought to be terminated or greatly diminished when the plasma is formed, after the joule heating of the metallic wire by the electrical current. Accordingly, it is common to account for the electrical energy delivered to the wire that the integration of current and voltage signals is halted when the voltage peak changes its slope. Usually, this moment is synchronized with the plasma appearance, as detected by optical sensors. In this work, experimental evidence of a two-step electrical energy absorption in an exploding wire surrounded by atmospheric air is presented. During the first step of the energy absorption the plasma is not formed, indicating that the delivered energy is not enough for ionizing the wire, giving place to a dark pause that lasts until a second energy absorption produces a plasma. The delay between the two steps can reach ≈2.2 µs for copper wires of 50 µm diameter charged at an initial voltage of 10 kV. Experimental investigation of variation of the delay between the two steps with different metals, charging voltages, and wire diameters are presented. A relation of the current density with the initial kinetic energy of the plasma and the electrical current rate is devised as a possible explanation of the observed phenomena.

Keywords

Exploding wiresEnergy absorption dynamicsDark pause
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 1 , March 2017 , pp. 26 - 32
Copyright
Copyright © Cambridge University Press 2016 

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