Transport critical current of Solenoidal MgB2/Cu Coils Fabricated Using a Wind-Reaction In-situ Technique

TL;DR

This study demonstrates that MgB2/Cu solenoid coils fabricated with a wind-reaction in-situ technique maintain high critical current densities, showing promise for large-scale superconducting applications.

Contribution

It introduces a wind-reaction in-situ fabrication method for MgB2/Cu coils that preserves high Jc and enables small-diameter coil fabrication with minimal performance loss.

Findings

High Jc of 133,000 A/cm2 at 4 K achieved in small coils

Transport Jc remains stable with increasing wire length

Coils with diameters as small as 10 mm can be fabricated

Abstract

In this letter, we report the results of transport Jc of solenoid coils upto 100 turns fabricated with Cu-sheathed MgB2 wires using a wind-reaction in-situ technique. Despite the low density of single core and some reaction between Mg and Cu-sheath, our results demonstrate the decrease in transport Jc with increasing length of MgB2 wires is insignificant. Solenoid coils with diameter as small as 10 mm can be readily fabricated using a wind-reaction in-situ technique. The Jc of coils is essentially the same as in the form of straight wires. A Jc of 133,000 A/cm2 and 125,000 A/cm2 at 4 K and self field has been achieved for a small coil wound using Cu-sheathed tape and Cu-sheathed wire respectively. These results indicate that the MgB2 wires have a great potential for lage scale applications