Field emission studies on technical niobium surfaces

Author

Calder, R.S. ; Dominichini, G. ; Hilleret, N.

Author_Institution

CERN, Geneva, Switzerland

Volume

25

Issue

2

fYear

1990

fDate

4/1/1990 12:00:00 AM

Firstpage

363

Lastpage

366

Abstract

The performance of superconducting accelerating cavities are limited by the spurious field emission of electrons. Various vacuum surface treatments have been investigated in a UHV system to reduce this emission. On baked niobium samples, the application of an electrical field leads to a gradual decrease of the field emitted currents; after treatment in an argon glow discharge, the currents are high and stable. An argon/oxygen discharge reduces markedly the field-emitted currents and could be an interesting treatment for superconducting cavities

Keywords

electron accelerators; electron field emission; niobium; superconducting devices; surface treatment; Ar glow discharge; Ar-O₂ discharge; Nb surfaces; UHV system; baked Nb samples; field emission reduction; field emitted currents; spurious field emission of electrons; superconducting accelerating cavities; superconducting cavities; vacuum surface treatments; Acceleration; Area measurement; Argon; Current measurement; Electron emission; Glow discharges; Niobium; Surface cleaning; Surface discharges; Surface treatment;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.52385

Filename

52385