Abstract
The development of reliable jointing technique is of great importance for the future of applied superconductivity, especially for superconducting magnets working in persistent mode. Superconducting joints with termination architecture between single-core not reacted ex-situ MgB2/Fe wires were manufactured and tested. I-V characteristics of joints were measured at 4.2 K and 20 K for variable external fields and compared with I-V of joined wire. The ratio of joints critical current to that of parent conductors (Ic-joint/Ic-wire) has been evaluated and discussed. It was found that Ic-joint with termination architecture may be even larger than Ic-wire at high external field, but decreasing for lower fields. Ic-joint/Ic-wire = 0.8 was measured for the best joint at 20 K and low external field 1.5 T, which is promising for functional persistent switch.
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