Plasma Chemistry and Plasma Processing

, Volume 7, Issue 1, pp 89–99 | Cite as

Ultraviolet-induced flashover of a plastic insulator using a pulsed excimer laser

  • C. L. Enloe
  • R. M. Gilgenbach


Ultraviolet-induced flashover has been observed over stressed, angled, acrylic insulators illuminated by a short (60 ns) pulse of excimer laser light at 249 nm. Flashover has been observed at ultraviolet fluences of 5–65 mJ/cm2 for electric field stresses approximately 10–30% of static breakdown stress. Insulators at positive angle (conventional configuration) exhibit a reduced tolerance to ultraviolet light versus insulators at negative angle (unconventional configuration) by approximately a factor of 2, while the presence of impurities at the triple point reduces the tolerance to ultraviolet even further. Flashover is related to the fluence, rather than the power density, for short pulses, and the production of photoelectrons is a likely mechanism for the initiation of flashover.

Key Words

Insulator flashover ultraviolet surface plasma 


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Copyright information

© Plenum Publishing Corporation 1987

Authors and Affiliations

  • C. L. Enloe
    • 1
  • R. M. Gilgenbach
    • 1
  1. 1.Intense Energy Beam Interaction Laboratory, Department of Nuclear EngineeringUniversity of MichiganAnn Arbor

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