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Variable-temperature critical-current measurements on a Nb-Ti wire

Published

Author(s)

Loren F. Goodrich, Theodore C. Stauffer

Abstract

We made variable-temperature critical-current (Ic) measurements on a commercial multifilamentary Nb-Ti wire for temperatures (T) from 4 to 9 K and magnetic fields (H) from 0 to 11.5 T using transport current. The measurements cover the whole range of critical currents from less than 0.1 A to over 800 A. This sample will be useful as a variable-temperature reference wire. To verify the measurements at variable- temperature, we compared critical currents up to 600 A on a specimen that was immersed in liquid helium to those on the same specimen in flowing helium gas. This comparison indicated our ability to control and measure specimen temperature was within 35 mK. We also calibrated the magnetoresistance effect of resistive thermometers for temperatures from 4 to 35 K and magnetic fields from 0 to 12 T. The critical-current data presented include electric field-current (E-I) characteristics, and E-T characteristics at constant I and H,Ic(H) at constant T, and Ic(T) at constant H.
Proceedings Title
Advances in Cryogenic Engineering
Volume
50
Conference Dates
September 23-26, 2003
Conference Location
Anchorage, AK, USA
Conference Title
International Cryogenic Materials Conference (ICMC)

Keywords

critical current, high current, n-value, Nb-Ti, superconductor, temperature margin, thermometry, variable temperature

Citation

Goodrich, L. and Stauffer, T. (2004), Variable-temperature critical-current measurements on a Nb-Ti wire, Advances in Cryogenic Engineering, Anchorage, AK, USA (Accessed June 19, 2024)

Issues

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Created July 26, 2004, Updated October 12, 2021