Development of homogeneous and high-performance REBCO bulks with various shapes by the single-direction melt growth (SDMG) method

We have developed a single-direction melt growth method in which REBCO melt-textured bulks grow only vertically from seed plate utilizing the difference peritectic temperatures of REBCO. Entirely c-grown YBCO, DyBCO and GdBCO with various sizes shapes were successfully fabricated high reproducibility. Disk-shaped showed trapped fields almost concentric field distributions, reflecting homogeneous boundaryless bulky crystal. In particular, YBCO bulk 32 mm diameter more than 1 T at 77 K. Furthermore, rectangular joined hexagonal fabricated, showing designed field-trapping distributions their through well-connected superconducting joints among bulks.