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We report an ultra-low resistance superconducting joint using unreactedmultifilament MgB2 wires produced by tailoring the powder compaction pressurewithin the joint with heat treatment conditions. The joint demonstrated anultra-low resistance of 5.48 x 10^-15 ohms and critical current (Ic) of 91.3 Aat 20 K in self-field. The microstructural and composition studies of the jointrevealed cracks and a high amount of MgO, respectively. These two featuresreduced the Ic of the joint to some extent; nevertheless, the joint resistancewas not affected by it. Our tailored joining process will play a pivotal rolein superconducting joint development.

Tailored joint fabrication process derived ultra-low resistance MgB2 superconducting joint