Improved superconducting critical current density in modified jelly roll Nb/sub 3/Sn by the application of niobium (Nb) diffusion barriers

Author

McKinnell, J.C. ; Smathers, D.B. ; Siddall, M.B. ; O´Larey, P.M.

Author_Institution

Teledyne Wah Chang, Albany, OR, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1768

Lastpage

1772

Abstract

One of the limiting factors of high field magnets is the overall current density available in the high field region. We report a 40% increase in the critical current density of the non-Cu of Modified Jelly Roll (MJR) Nb/sub 3/Sn wires. The increase occurs when niobium diffusion barriers are substituted for the standard vanadium diffusion barriers. The Nb/sub 3/Sn J/sub C/ is also shown to increase when vanadium is removed from the wire. The effective filament diameter of the wire increases only slightly and depends linearly on the MJR diameter. Niobium diffusion barriers are found to improve the RRR of the wire relative to vanadium diffusion barriers.<>

Keywords

critical current density (superconductivity); multifilamentary superconductors; niobium; niobium alloys; superconducting materials; tin alloys; Nb diffusion barriers; Nb/sub 3/Sn modified jelly roll wires; Nb/sub 3/Sn-Nb; Nb/sub 3/Sn-V; V diffusion barriers; critical current density; filament diameter; high field magnets; Critical current density; Current density; Magnetic materials; Magnetization; Magnets; Niobium; Performance evaluation; Testing; Tin; Wire;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402921

Filename

402921