Title :
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
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;
Conference_Titel :
Discharges and Electrical Insulation in Vacuum, 1998. Proceedings ISDEIV. XVIIIth International Symposium on
Conference_Location :
Eindhoven
Print_ISBN :
0-7803-3953-3
DOI :
10.1109/DEIV.1998.740594
