Temperature dependence of critical current density for Nb3Sn and Nb + 60 wt% Ti superconducting alloys

Author

Benz, M.G.

Author_Institution

General Electric Corporate Research and Development Center, Schenectady, N.Y.

Volume

8

Issue

3

fYear

1972

fDate

9/1/1972 12:00:00 AM

Firstpage

614

Lastpage

616

Abstract

The J-H-T critical surface has been measured at temperatures near 4.2 K for diffusion-processed Nb3Sn and for Nb+60 wt % Ti superconducting alloys. The apparatus used for these measurements consists of a split Nb3Sn superconducting solenoid capable of fields up to 65 kOe, a 4-probe potentiometric sample holder capable of carrying currents up to 1000 A, and an enclosed cryostat which allowed one to vary the temperature of the coil and the sample from 3.4 to 4.8 K by varying the pressure over the liquid helium. Data are presented for the critical current density Jcand for the temperature dependence of critical current density ( $\\partial J_{c}/\\partial T$ ) observed at 4.2 K. From these data, the values for the two stability parameters of interest, the fractional temperature dependence of critical current density [ $-(1/J_{c}) (\\partial J_{c}/\\partial T)$ ] and the stability parameter $J_{c}^{2} [-(1/J_{c})(\\partial J_{c}/\\partial T)]$ , were calculated and are presented along with an estimate of the wire diameter required for adiabatic stabilization.

Keywords

Niobium-tin alloys; Niobium-titanium alloys; Superconducting alloys; Critical current density; Current measurement; Niobium alloys; Stability; Superconducting coils; Superconducting materials; Temperature dependence; Temperature measurement; Tin; Titanium alloys;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1972.1067498

Filename

1067498