Superconducting properties of ultra-pure niobium welded joints

An optimal electron-beam welding operating regime for ultra-pure sheet niobium has been developed for use in a superconducting resonator for the International Linear Collider (ILC). The formation of weld joints is studied and their microstructure and microhardness are investigated taking the require...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2015-07, Vol.41 (7), p.522-527
Main Authors: Demyanov, S. E., Kaniukov, E. Yu, Pobol, I. L., Yurevich, S. V., Baturitsky, M. A., Shirkov, G. D., Budagov, Yu. A., Demin, D. L., Azaryan, N. S.
Format: Article
Language:English
Subjects:
Electrical measurement
Electron beams
Microhardness
Niobium
Resonators
Seams
Superconducting supercolliders
Superconductivity
Welded joints
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Summary:An optimal electron-beam welding operating regime for ultra-pure sheet niobium has been developed for use in a superconducting resonator for the International Linear Collider (ILC). The formation of weld joints is studied and their microstructure and microhardness are investigated taking the required geometry of the weld seams into account. Low-temperature electrical measurements in magnetic fields up to 2 T are used to determine the critical parameters of the superconducting transition in the weld area. From the standpoint of the superconducting properties of the resonator, the slight degradation in the characteristics of sheet niobium observed in the thermally affected area (about 10% on average) is not of fundamental importance.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.4927078