We have been developing high critical current REBCO tapes and high engineering current density (Je) REBCO wires for high magnetic field applications. REBCO tapes made by our Advanced Metal Organic Chemical Vapor Deposition (MOCVD) method have yielded critical current over 1830 A/4-mm-width at 4.2 K, 20 T in short samples and over 1,270 A/4-mm-width in 50-m-long tapes. A-MOCVD method has also enabled fabrication of double-sided REBCO tapes with critical current over 1,000 A/4-mm-width at 20 K, 20 T. Double-sided tapes also exhibit excellent current sharing because a face-to-face contact between tapes is always present. Consequently, a superior quench stability has been achieved in these tapes. A slot-and-fill technique has also been demonstrated to improve current sharing and quench stability. A fast quench detection method has been developed using the REBCO tape itself as a microwave transmission line. Since the mechanical strength is a limiting factor for use of high-current REBCO conductors in high magnetic field applications, we have developing methods to significantly improve the yield strength of our tapes. Highlights of recent progress in our projects on Advanced REBCO conductors will be presented.

This work was supported by multiple awards from the U.S. Department of Energy and the U.S. Navy.