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

Abstract

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> 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, <formula formulatype="inline"><tex>$J_{\rm c}$</tex></formula>, in 5 T parallel to <formula formulatype="inline"><tex>$c$</tex></formula>-axis at 65 K and 4.2 K were 0.44 <formula formulatype="inline"><tex>${\rm MA/cm}^{2}$</tex> </formula> and 5.5 <formula formulatype="inline"><tex>${\rm MA/cm}^{2}$</tex> </formula>, respectively. Moreover, even in very high magnetic flux density, the superior <formula formulatype="inline"><tex>$J_{\rm c}$</tex></formula> property remains at lower temperature, e.g. <formula formulatype="inline"><tex>$J_{\rm c}$</tex></formula> at 4.2 K in 26 T was 2 <formula formulatype="inline"> <tex>$\ {\rm MA/cm}^{2}$</tex></formula> . We also showed analytical expressions of electric field vs. current density <formula formulatype="inline"> <tex>$(E\hbox{–}J)$</tex></formula> characteristics based on a framework of percolation model and scaling law of the flux pinning properties. Using the expressions, <formula formulatype="inline"><tex>$E\hbox{–}J$</tex> </formula> characteristics and <formula formulatype="inline"><tex>$J_{\rm c}$</tex></formula> value at any conditions of temperature and magnetic flux density can be predicted quantitatively. </para>