Pulsed volume and surface discharges in an SF6 environment

Russell Vela, John T. Krile, Andreas A. Neuber, Hermann G. Krompholz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

Volume and surface discharges in SF6 are investigated to support refurbishment of the Z-machine's Laser Triggered Gas Switch, LTGS, at Sandia National Laboratories (SNL). The recently upgraded LTGS has exhibited a failure mode which results in surface flashover on the inside of the dielectric switch envelope. These flashover events degrade the LTGS performance and cause a pre-fire in the successive shot. In the following, experimental results of both volume breakdown and surface flashover across different dielectric materials in SF6 primarily at 20 psig are presented. In addition to fast voltage and current monitoring of the breakdown events, there was an emphasis put on imaging and optical emission spectra (̃200 nm to ̃700 nm). As much as possible, the laboratory experiment was designed to reproduce the conditions found in the 5.5 MV LTGS. The principal physical mechanisms involved in surface flashover at various pressures of SF6 are vital to the understanding of this specific switch failure mode.

Original languageEnglish
Title of host publicationPPPS-2007
Subtitle of host publicationPulsed Power and Plasma Science 2007, The 16th IEEE International Pulsed Power Conference and The 34th IEEE International Conference on Plasma Science
Pages1831-1835
Number of pages5
DOIs
StatePublished - 2007
EventPPPS-2007: Pulsed Power and Plasma Science 2007, The 16th IEEE International Pulsed Power Conference and The 34th IEEE International Conference on Plasma Science - Albuquerque, NM, United States
Duration: Jun 17 2007Jun 22 2007

Publication series

NamePPPS-2007 - Pulsed Power Plasma Science 2007
Volume2

Conference

ConferencePPPS-2007: Pulsed Power and Plasma Science 2007, The 16th IEEE International Pulsed Power Conference and The 34th IEEE International Conference on Plasma Science
CountryUnited States
CityAlbuquerque, NM
Period06/17/0706/22/07

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