RE-Ba-Cu-O (REBCO, RE=rare earth) Symmetric Tape Round (STAR®) wires of 1.5 – 2.5 mm in diameter have been fabricated with 4 – 12 strands of symmetric REBCO tapes made by Advanced Metal Organic Chemical Vapor Deposition (MOCVD). 1.5 mm diameter STAR® wires made with just four Advanced MOCVD tape strands are able to sustain nearly the same critical current (Ic
) as 2.5 mm diameter STAR® wires made with 12 commercial-grade tape strands. An Ic
of 1070 A, corresponding to an engineering current density (Je
) of 597 A/mm2, has been demonstrated at 4.2 K, 30 T in 1.5 mm diameter, 4-strand STAR® wire at a bend radius of 15 mm. This Ic value exactly matches the Ic
expected from the lift factor of the tape strands used in the wire. The 2.5 mm diameter STAR® wires made with 12 Advanced MOCVD tape strands exhibit an Ic
of 1,075 A at 77 K, self-field and sustained currents of 2,500 to 2,750 A at 4.2 K, 30 T before burnout, corresponding to a Je
greater than 500 A/mm2. These results show that the cost of STAR® wires can be substantially reduced using fewer tape strands of high-performance Advanced MOCVD tapes and that the superior bend performance of STAR® wires can be maintained even using 12 strands of Advanced MOCVD tapes with 4-µm-thick REBCO films.
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