Speaker
Description
The National High Magnetic Field Laboratory (NHMFL) is in the fortunate situation to put substantial effort into advancing all three high field magnet relevant types of high temperature superconductor (HTS) technologies, REBCO, Bi-2223, and Bi-2212, as a part of its commitment to develop all-superconducting high field magnets. Here we are presenting our work on Bi-2212 coil technology, which experienced a strong boost after significant progress was made in the heat-treatment process of the wire [1]. Bi-2212 wire has distinctive advantages compared with the other HTS conductors, as it can be made as round or aspected wire, it can be twisted, is multifilament, it can be easily cabled, it has low magnetization, and has isotropic electromagnetic properties. Operating conditions at highest fields, however, are extremely demanding on the coil mechanics and have yet to be fully explored in in HTS coils in general. Several test coils have been built and tested to evaluate various coil reinforcement schemes. In a collaboration with Lawrence Berkeley National Laboratory (LBNL), we heat treated several of Bi-2212 racetrack and CCT coils. This presentation will provide an overview and update of our on-going Bi-2212 coil R&D effort.
Acknowledgement: This work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1644779 and DMR-1839796, and the State of Florida, and is amplified by the U.S. Magnet Development Program (MDP).
[1] D. C. Larbalestier et al., “Isotropic round-wire multifilament cuprate superconductor for generation of magnetic fields above 30 T,” Nature Materials volume 13, pages 375–381 (2014)
