Investigation of vacuum insulator surface dielectric strength with nanosecond pulses

W. C. Nunnally, M. Krogh, C. Williams, F. Allen, D. Trimble, S. Sampayan, George J Caporaso

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

12 Scopus citations


The maximum vacuum insulator surface dielectric strength determines the acceleration electric field gradient possible in a short pulse accelerator. Previous work has indicated that higher electric field strengths along the insulator-vacuum interface might be obtained as the pulse duration is decreased [1].. In this work, a 250 kV, single ns wide impulse source was applied to small diameter, segmented insulators samples in a vacuum to evaluate the multi-layer surface dielectric strength of the sample construction. Resonances in the low inductance test geometry were used to obtain unipolar, pulsed electric fields in excess of 100 MV/m on the insulator surface. The sample construction, experimental arrangement and experimental results are presented for the initial data in this work. Modeling of the multi-layer structure is discussed and methods of improving insulator surface dielectric strength in a vacuum are proposed.

Original languageEnglish (US)
Title of host publicationDigest of Technical Papers-IEEE International Pulsed Power Conference
EditorsM. Giesselmann, A. Neuber
Number of pages4
StatePublished - 2003
Externally publishedYes
Event14th IEEE International Pulsed Power Conference - Dallas, TX, United States
Duration: Jun 15 2003Jun 18 2003


Other14th IEEE International Pulsed Power Conference
Country/TerritoryUnited States
CityDallas, TX

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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