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Browse Journals & Magazines > Dielectrics and Electrical In ...> Volume:5 Issue:6 Help

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

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3 Author(s)
Yamamoto, O. ; Dept. of Electr. Eng., Kyoto Univ., Japan ; Takuma, T. ; Tanabe, Y.

By using an electrostatic probe located close to the triple junction on the cathode surface, we have conducted real-time observations of the change in electric field due to surface charging of an insulator in vacuum. A cylindrical sample made of polymethylmethacrylate (PMMA) or Al2O3 has been exposed to HVDC. An axisymmetric simulation based on the secondary electron emission electron avalanche (SEEA) theory 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 inception of charging at a voltage well below the measured flashover voltage. These results clearly support the SEEA theory as a macroscopic mechanism of surface charging of an insulator in vacuum

Published in:
Dielectrics and Electrical Insulation, IEEE Transactions on  (Volume:5 ,  Issue: 6 )

Date of Publication: Dec 1998

Page(s):
961 - 965
ISSN :
1070-9878
INSPEC Accession Number:
6156278
Digital Object Identifier :
10.1109/94.740783
Product Type:
Journals & Magazines
Date of Current Version :
06 August 2002
Issue Date :
Dec 1998
Sponsored by :
IEEE Dielectrics and Electrical Insulation Society

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