Real-time observation of surface charging on a cylindrical insulator in vacuum

Author

Yamamoto, O. ; Takuma, T. ; Hamada, S. ; Tanabe, Y. ; Kakehashi, Y. ; Hayashi, H. ; Ikoma, S.

Author_Institution

Kyoto Univ., Japan

Volume

1

fYear

1998

fDate

17-21 Aug 1998

Firstpage

143

Abstract

This paper describes the charging process of a cylindrical insulator made of PMMA or Al₂O₃. By using an electrostatic probe located inside the insulator on the cathode surface, we have conducted real-time observation of the electric field change due to the surface charging. An axial-symmetrical simulation based on a secondary electron emission avalanche has been performed. The measured results agreed with the simulation concerning the polarity of the accumulated charge as well as the field strength. The simulation also predicts the charging inception at a voltage measured well below the flashover

Keywords

aluminium compounds; cathodes; electric field measurement; electron avalanches; flashover; insulator testing; polymer insulators; secondary electron emission; surface charging; vacuum breakdown; Al₂O₃; PMMA; accumulated charge polarity; axial-symmetrical simulation; cathode surface; charging inception; cylindrical insulator; electric field change; electrostatic probe; field strength; flashover; polymethylmethacrylate; real-time observation; secondary electron emission avalanche; surface charging; vacuum; voltage measurement; Cathodes; Charge measurement; Current measurement; Dielectrics and electrical insulation; Electron emission; Electrostatic measurements; Predictive models; Probes; Surface charging; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Discharges and Electrical Insulation in Vacuum, 1998. Proceedings ISDEIV. XVIIIth International Symposium on

Conference_Location

Eindhoven

ISSN

1093-2941

Print_ISBN

0-7803-3953-3

Type

conf

DOI

10.1109/DEIV.1998.740594

Filename

740594