NDLI: Improving withstand voltage by roughening the surface of an insulating spacer used in vacuum

Content Provider	IEEE Xplore Digital Library
Author	Yamamoto, O. Takuma, T. Fukuda, M. Nagata, S. Harasawa, T. Sonoda, T.
Copyright Year	2002
Description	Author affiliation: Kyoto Univ., Japan (Yamamoto, O.; Takuma, T.; Fukuda, M.; Nagata, S.; Harasawa, T.)
Abstract	This paper describes a simple and reliable method to improve the surface insulation strength of a spacer used in vacuum. This approach roughens the surface of a cylindrical spacer to an average roughness higher than 2 /spl mu/m. The spacer materials examined are SiO/sub 2/, PMMA, PTFE and Al/sub 2/O/sub 3/. The spacer is subjected to a ramped DC voltage and its surface charging is observed by using an electrostatic probe embedded into the cathode. It has been found that the surface roughness R/sub a/ decisively affects the charging, which decreases as R/sub a/ increases. By increasing R/sub a/ larger than about 2 /spl mu/m, the charging does not occur until a higher voltage is applied, thus improving the insulation property.
Sponsorship	Region Centre Ville de Tours Conseil General D'Indre et Loire ABB IEEE SANDIA TOSHIBA
Starting Page	71
Ending Page	74
File Size	259140
Page Count	4
File Format	PDF
ISBN	0780373944
DOI	10.1109/ISDEIV.2002.1027311
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-07-01
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage Rough surfaces Surface roughness Flashover Probes Cathodes Dielectrics and electrical insulation Solids Anodes Wheels
Content Type	Text
Resource Type	Article

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