Study on I sub(c)(T, B) for the NbTi strand intended for ITER PF insert coil

• Published in: IEEE transactions on applied superconductivity Vol. 14; no. 2
• Main Authors: Kozlenkova, NI, Vedernikov, G P, Shikov, A K, Potanina, LV, Filatov, A V, Vorobieva, A E, Pantsyrnyi, VI, Gubkin, IN
• Format: Journal Article
• Language: English
• Published: 01-01-2004
• Subjects: Coiling; Data processing; Inserts; Magnetic fields; Niobium base alloys; Strands; Superconductivity; Titanium base alloys
• ISSN: 1051-8223
• DOI: 10.1109/TASC.2004.830385

The magnetic field and temperature characteristics I sub(c)(T, B) are important for practical application. This work presents the results of investigations on I sub(c)(T, B) for a strand based on Nb-47.5 wt% Ti alloy. The strand is used in the cable of the ITER PF insert coil, which is under construction. The measurements were carried out in magnetic fields up to 9 T and in the range of temperatures from 4.2 K to 7 K. The critical temperature T sub(c)(B) was determined from voltage-temperature characteristics (VTC) taken in magnetic fields. The temperature dependencies of the upper critical field B sub(c2)(T) were analyzed. By experimental data processing and analysis of literature, relationships describing B sub(c2)(T) and I sub(c)(B, T) dependencies have been defined. Processing programs were used, which allow obtaining all fitting parameters of I sub(c)(T, B) relation.