Magnetothermal transition in YBCO melt textured materials

摘要

Conductors cut from large YBCO single domains textured by a combination of Melt Texturing Growth and Top Seeding techniques were studied for Fault Current Limiter applications. In self field, homogeneous transport critical current densities as large as 4 10(4) and 9 10(4) A/cm(2) were measured in shaped YBCO single domains up to 5 cm in length. Above J(c), experiments focused on magnetothermal transitions showed that the silver coating should have an adequate thickness so as to prevent the conductors from burning. Capability of textured materials to support high instantaneous power (40 GW/m(3)) and energy dissipation (190 MJ/m(3)) during the transition was demonstrated in a 4 T magnetic field. (C) 1999 Elsevier Science Ltd. All rights reserved. [References: 11]