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Title: Transforming dielectric coated tungsten and platinum wires to gaseous state using negative nanosecond-pulsed-current in vacuum

Abstract

With the help of thin dielectric coatings, corona free explosions were achieved in the region of about half a wire length (2 cm) for tungsten wires and nearly the whole wire length for platinum wires under a fast rising (46–170 A/ns) negative polarity current in vacuum. Expansion velocity of the tungsten gas was over 10 km/s. Current waveforms from exploding coated wires were similar to those from bare wires in the air including a current pause stage. Coated wires with different coating parameters had a similar joule energy deposition before voltage collapsed, but a quite different scenario in the region near the electrodes. The axial field under negative current was the main reason for the axial inhomogeneity of coated tungsten wires. Tungsten or platinum gases in the vaporized region were tightly encompassed by the dielectric coating, while gaps or probably low density gases, were observed between the coating and the edge of the dense wire core in the core-corona structure region.

Authors:
; ; ; ; ; ;  [1];  [2]
  1. State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049 (China)
  2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900 (China)
Publication Date:
OSTI Identifier:
22403280
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COATINGS; CURRENTS; DIELECTRIC MATERIALS; PLATINUM; PULSES; TUNGSTEN; WAVE FORMS; WIRES

Citation Formats

Wu, Jian, Li, Xingwen, Wang, Kun, Yang, Zefeng, Shi, Zongqian, Jia, Shenli, Qiu, Aici, and Li, Zhenghong. Transforming dielectric coated tungsten and platinum wires to gaseous state using negative nanosecond-pulsed-current in vacuum. United States: N. p., 2014. Web. doi:10.1063/1.4902364.
Wu, Jian, Li, Xingwen, Wang, Kun, Yang, Zefeng, Shi, Zongqian, Jia, Shenli, Qiu, Aici, & Li, Zhenghong. Transforming dielectric coated tungsten and platinum wires to gaseous state using negative nanosecond-pulsed-current in vacuum. United States. https://doi.org/10.1063/1.4902364
Wu, Jian, Li, Xingwen, Wang, Kun, Yang, Zefeng, Shi, Zongqian, Jia, Shenli, Qiu, Aici, and Li, Zhenghong. 2014. "Transforming dielectric coated tungsten and platinum wires to gaseous state using negative nanosecond-pulsed-current in vacuum". United States. https://doi.org/10.1063/1.4902364.
@article{osti_22403280,
title = {Transforming dielectric coated tungsten and platinum wires to gaseous state using negative nanosecond-pulsed-current in vacuum},
author = {Wu, Jian and Li, Xingwen and Wang, Kun and Yang, Zefeng and Shi, Zongqian and Jia, Shenli and Qiu, Aici and Li, Zhenghong},
abstractNote = {With the help of thin dielectric coatings, corona free explosions were achieved in the region of about half a wire length (2 cm) for tungsten wires and nearly the whole wire length for platinum wires under a fast rising (46–170 A/ns) negative polarity current in vacuum. Expansion velocity of the tungsten gas was over 10 km/s. Current waveforms from exploding coated wires were similar to those from bare wires in the air including a current pause stage. Coated wires with different coating parameters had a similar joule energy deposition before voltage collapsed, but a quite different scenario in the region near the electrodes. The axial field under negative current was the main reason for the axial inhomogeneity of coated tungsten wires. Tungsten or platinum gases in the vaporized region were tightly encompassed by the dielectric coating, while gaps or probably low density gases, were observed between the coating and the edge of the dense wire core in the core-corona structure region.},
doi = {10.1063/1.4902364},
url = {https://www.osti.gov/biblio/22403280}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 11,
volume = 21,
place = {United States},
year = {Sat Nov 15 00:00:00 EST 2014},
month = {Sat Nov 15 00:00:00 EST 2014}
}