Nanosecond electrical explosion of thin aluminum wire in vacuum : experimental and computational investigations.

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The experimental and computational investigations of nanosecond electrical explosion of thin Al wire in vacuum are presented. We have demonstrated that increasing the current rate leads to increased energy deposited before voltage collapse. Laser shadowgrams of the overheated Al core exhibit axial stratification with a {approx}100 {micro}m period. The experimental evidence for synchronization of the wire expansion and light emission with voltage collapse is presented. Two-wavelength interferometry shows an expanding Al core in a low-ionized gas condition with increasing ionization toward the periphery. Hydrocarbons are indicated in optical spectra and their influence on breakdown physics is discussed. The radial velocity ... continued below

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67 p.

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Cochrane, Kyle Robert (Ktech Corporation, Albuquerque, NM); Struve, Kenneth William; Rosenthal, Stephen Edgar; McDaniel, Dillon Heirman; Sarkisov, Gennady Sergeevich (Ktech Corporation, Albuquerque, NM) & Deeney, Christopher June 1, 2004.

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Description

The experimental and computational investigations of nanosecond electrical explosion of thin Al wire in vacuum are presented. We have demonstrated that increasing the current rate leads to increased energy deposited before voltage collapse. Laser shadowgrams of the overheated Al core exhibit axial stratification with a {approx}100 {micro}m period. The experimental evidence for synchronization of the wire expansion and light emission with voltage collapse is presented. Two-wavelength interferometry shows an expanding Al core in a low-ionized gas condition with increasing ionization toward the periphery. Hydrocarbons are indicated in optical spectra and their influence on breakdown physics is discussed. The radial velocity of low-density plasma reaches a value of {approx}100 km/s. The possibility of an overcritical phase transition due to high pressure is discussed. 1D MHD simulation shows good agreement with experimental data. MHD simulation demonstrates separation of the exploding wire into a high-density cold core and a low-density hot corona as well as fast rejection of the current from the wire core to the corona during voltage collapse. Important features of the dynamics for wire core and corona follow from the MHD simulation and are discussed.

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67 p.

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  • Report No.: SAND2004-2869
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/974875 | External Link
  • Office of Scientific & Technical Information Report Number: 974875
  • Archival Resource Key: ark:/67531/metadc934042

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Office of Scientific & Technical Information Technical Reports

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  • June 1, 2004

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 29, 2016, 9:27 p.m.

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Cochrane, Kyle Robert (Ktech Corporation, Albuquerque, NM); Struve, Kenneth William; Rosenthal, Stephen Edgar; McDaniel, Dillon Heirman; Sarkisov, Gennady Sergeevich (Ktech Corporation, Albuquerque, NM) & Deeney, Christopher. Nanosecond electrical explosion of thin aluminum wire in vacuum : experimental and computational investigations., report, June 1, 2004; United States. (digital.library.unt.edu/ark:/67531/metadc934042/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.