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Description
Development of high-field magnets above 30 T using high temperature superconductors (HTS) is a core activity at the NHMFL: both REBCO-coated tape conductors (CCs) and Bi-2212 round wires are extensively studied in terms of material performances and development of conductor and magnet technology. We will give a presentation on particular aspects of this wide research work, regarding characterization and behavior of the conductors relevant for applications. Regarding CCs, we will show characterization of the angular critical current Ic(q,B) at 4.2 K up to 31 T which is important for magnet design as well as to understand pinning. We will focus on the effect of Zr doping which produces BaZrO3 (BZO) precipitates in SuperPower Inc. recent CCs. As for Bi-2212, we investigated why the Jc of multifilamentary wires tends to decline as the wire length increases.