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Majkic, Goran
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article
High critical current STAR® wires with REBCO tapes by advanced MOCVD
Abstract
<jats:title>Abstract</jats:title><jats:p>RE–Ba–Cu–O (REBCO, RE = rare earth) symmetric tape round (STAR<jats:sup>®</jats:sup>) wires of 1.5–2.5 mm diameter have been fabricated with 4–12 strands of symmetric REBCO tape made by advanced metal organic chemical vapor deposition (MOCVD). 1.5 mm diameter STAR<jats:sup>®</jats:sup> wires made with just four advanced MOCVD tape strands are able to sustain nearly the same critical current (<jats:italic>I</jats:italic><jats:sub>c</jats:sub>) as 2.5 mm diameter wires made with 12 commercial-grade tape strands. An <jats:italic>I</jats:italic><jats:sub>c</jats:sub> of 1070 A, corresponding to an engineering current density (<jats:italic>J</jats:italic><jats:sub>e</jats:sub>) of 597 A mm<jats:sup>−2</jats:sup>, has been demonstrated at 4.2 K, 30 T in 1.5 mm diameter, four-strand wire at a bend radius of 15 mm. This <jats:italic>I</jats:italic><jats:sub>c</jats:sub> value exactly matches the <jats:italic>I</jats:italic><jats:sub>c</jats:sub> expected from the lift factor of the tape strands used in the wire. The 2.5 mm diameter STAR<jats:sup>®</jats:sup> wires made with 12 advanced MOCVD tape strands exhibit an <jats:italic>I</jats:italic><jats:sub>c</jats:sub> of 1075 A at 77 K, self-field and sustained currents of 2500–2750 A at 4.2 K, 30 T before burnout, corresponding to a <jats:italic>J</jats:italic><jats:sub>e</jats:sub> greater than 500 A mm<jats:sup>−2</jats:sup>. These results show that the cost of STAR<jats:sup>®</jats:sup> wires can be substantially reduced using fewer tape strands of high-performance advanced MOCVD tapes and that the superior bend performance of STAR<jats:sup>®</jats:sup> wires can be maintained, even using 12 strands of advanced MOCVD tapes with 4 <jats:italic>μ</jats:italic>m thick REBCO films.</jats:p>