Abstract
Electromagnetic compaction of in situ MgB2/Cu wire has been achieved using a custom-built 200 J device. The monofilament core packing density was increased by 8% and up to 31% for unreacted and reacted wires respectively. The higher density of the MgB2 core resulted in a critical current density increase of up to 75% in comparison to that for cold-drawn-only wire. Applying this treatment to a wire with Cu powder additions to the core and with an optimized heat treatment resulted in one of the highest ever reported values of Jc for MgB2/Cu wires of 6.83 × 103 A cm−2 at 4.2 K and 6 T.
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