Optical emission of exploding-film and wire-initiated discharges

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Optical sources of several megawatts-cm/sup -2/ over large surface areas are available from electrical discharges initiated by exploding films and wires immersed in a gas. Discharging high-current capacitor banks into the metal conductors causes them to melt, vaporize, and then eventually ionize to a high-conductivity plasma of less than a milliohm/cm-length resistance. As such, over 1000 MW of ohmic heating goes into the discharge, elevating its blackbody temperature up to 35,000 K. In this work, film thicknesses from 0.1 to 10 ..mu..m and wire diameters from 0.051 to 0.25 mm with lengths ranging from 8 to 90 cm were exploded ... continued below

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Pages: 9

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Ware, K.D. & Jones, C.R. January 1, 1983.

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Description

Optical sources of several megawatts-cm/sup -2/ over large surface areas are available from electrical discharges initiated by exploding films and wires immersed in a gas. Discharging high-current capacitor banks into the metal conductors causes them to melt, vaporize, and then eventually ionize to a high-conductivity plasma of less than a milliohm/cm-length resistance. As such, over 1000 MW of ohmic heating goes into the discharge, elevating its blackbody temperature up to 35,000 K. In this work, film thicknesses from 0.1 to 10 ..mu..m and wire diameters from 0.051 to 0.25 mm with lengths ranging from 8 to 90 cm were exploded and the brightness temperatures measured in the spectral regions about 200, 280, and 520 nm. The optical emission generally increased with the time rate of change of the current, the current per unit diameter for the films, and the gas pressure in the cell, but showed little dependence on the mass or kind of metal exploded. The discharge radius expanded at velocities of approximately 1.5 km-s/sup -1/.

Physical Description

Pages: 9

Notes

NTIS, PC A02/MF A01.

Source

  • Society of Photo-Optical Instrumentation Engineers conference, Santa Fe, NM, USA, 11 Apr 1983

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  • Other: DE83014154
  • Report No.: LA-UR-83-1588
  • Report No.: CONF-830425-29
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5908381
  • Archival Resource Key: ark:/67531/metadc1096041

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1983

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • May 31, 2018, 12:58 p.m.

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Ware, K.D. & Jones, C.R. Optical emission of exploding-film and wire-initiated discharges, article, January 1, 1983; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1096041/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.