Use of Laser Lithography for Striating 2G HTS Conductors for AC Loss Reduction

A scalable laser lithographic process has been used to striate second-generation high-temperature superconducting coated conductors manufactured with a rolling-assisted biaxially textured substrate and metal organic deposition process by American Superconductor Corporation to reduce ac losses for electric power applications. The process involves laser patterning a resist coating and etching, which can be scaled up for commercial production. The results show that the critical current, $\boldsymbol{I}_{\boldsymbol{c}}$ , is not degraded for striation widths greater than 150 m and that the ac losses for the 150-m wide striations are reduced from the unpatterned 1-cm wide conductor by a factor of 15 for a 60-mT perpendicular peak magnetic field at 50 Hz.