Current Transport Properties of 200 A-200 m-Class IBAD YBCO Coated Conductor Over Wide Range of Magnetic Field and Temperature

摘要

Current transport properties in 200 A-200 m-class IBAD-YBCO coated conductor (CC) have been investigated over a wide range of temperature and magnetic flux density up to 26 T . YBCO CC fabricated by reel-to-reel pulsed laser deposition equipment with a multi-plume and multi-turn deposition system showed high critical current of 245 A in length of 212.6 m . Critical current density, $J_{rm c}$, in 5 T parallel to $c$-axis at 65 K and 4.2 K were 0.44 ${rm MA/cm}^{2}$ and 5.5 ${rm MA/cm}^{2}$ , respectively. Moreover, even in very high magnetic flux density, the superior $J_{rm c}$ property remains at lower temperature, e.g. $J_{rm c}$ at 4.2 K in 26 T was 2 $ {rm MA/cm}^{2}$ . We also showed analytical expressions of electric field vs. current density $(Ehbox{–}J)$ characteristics based on a framework of percolation model and scaling law of the flux pinning properties. Using the expressions, $Ehbox{–}J$ characteristics and $J_{rm c}$ value at any conditions of temperature and magnetic flux density can be predicted quantitatively.