Evaluation of YBCO to 45T over wide temperature range

The ability to tune the vortex pinning of YBCO in coated conductor form is both an enormous benefit to future superconducting materials applications and a challenge to understanding the properties over a broad range on particular samples. We have been doing such characterizations in support of the design of 30 T magnets. In recent work we have mapped the $J_{c}$ to fields of 33T at temperatures down to 4K and measured the angular dependent $J_{c}$ in similar fields. We see that it is possible to enhance $H_{irr}$ by about 15{\%} as compared to standard YBCO at 55K, when a high density of RE$_{2}$O3 nanoprecipitates is formed in the microstructure These precipitate arrays produce $J_{c}$ 50 MA/cm$^{2}$ almost 20{\%} of the depairing current density.