Investigation of breakdown emission sites on the surface of large-area stainless-steel cathodes in vacuum

Author

Batrakov, A.V. ; Johnson, D.J. ; Onischenko, S.A. ; Proskurovsky, D.I.

Author_Institution

Institute of High Current Electronics, 2/3, Akademichesky Ave., Tomsk 634055, Russia

Volume

1

fYear

2004

fDate

Sept. 27 2004-Oct. 1 2004

Firstpage

40

Lastpage

43

Abstract

The paper describes the results of study of prebreakdown emission in vacuum and correlations between prebreakdown emission sites and breakdown of gaps formed by plane-parallel electrodes made of stainless steels. Anode-scanning probe vas used for recognizing emission sites and reconstructing emission maps of 8-cm-diameter plane cathodes. After recognizing emission sites, high-voltage 60-ns 220-kV square pulses were applied with closing a gap until breakdown occurs. Cathode emission sites were found experimentally to be responsible for electrical breakdown at hold-off electric field essentially below 1 MV/cm. In a case of better insulating ability of a vacuum gap, the anode becomes more influencing on electrical insulation of a gap.

Keywords

Anodes; Cathodes; Dielectrics and electrical insulation; Electric breakdown; Electrodes; Steel; Surface contamination; Surface treatment; Vacuum breakdown; Vacuum technology;

fLanguage

English

Publisher

ieee

Conference_Titel

Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV. XXIst International Symposium on

Conference_Location

Yalta, Crimea

ISSN

1093-2941

Print_ISBN

0-7803-8461-X

Type

conf

DOI

10.1109/DEIV.2004.1418595

Filename

1418595