Study of the Relationship Between Maximum Specific Energy and Wire Diameter During Electrical Explosion of Tungsten Wires

Driven by a pulsed current of 1-3 kA in amplitude and 15-30 ns in risetime, electrical explosions of tungsten wires of different diameters (25/18/15/12.5/10 μm) were carried out. Shadowgraphs as well as interferograms of exploding tungsten wires were obtained with a YAG Laser. The experimental resul...

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Veröffentlicht in:IEEE transactions on plasma science 2016-10, Vol.44 (10), p.2092-2096
Hauptverfasser: Shi, Huan-Tong, Zou, Xiao-Bing, Wang, Xin-Xin
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Sprache:eng
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Zusammenfassung:Driven by a pulsed current of 1-3 kA in amplitude and 15-30 ns in risetime, electrical explosions of tungsten wires of different diameters (25/18/15/12.5/10 μm) were carried out. Shadowgraphs as well as interferograms of exploding tungsten wires were obtained with a YAG Laser. The experimental results showed that with the decrease in wire diameter, the maximum specific energy E sm (the maximum deposition energy per atom), as well as the wire expansion speed has an increase-decrease tendency under both negative and positive current pulses. In order to understand this phenomenon, the specific power P v at the start moment of vaporization was simulated, and the changing tendency of P v versus diameter was found to be similar to that of E sm versus diameter. Based on the experiments and simulations, we propose that the specific power P v at the evaporating point must also be regarded as an important factor leading to the change in the maximum specific energy E sm .
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2016.2549553