Improvement of uniformity of Ic distributions in long REBCO with BMO coated conductors by in-plume PLD method

Abstract

Long REBa2Cu3OX (REBCO, RE: rare earth element) with BaMO3 (BMO, M: metal) coated conductors have been expected for the industrial and commercial applications at high temperatures in magnetic fields. Especially, the multi-filamentary structure long REBCO with BHO coated conductors are effective for control of the shielding current of coated conductor excited by applied magnetic fields and alternating-current loss. We fabricated long EuBa2Cu3OX (EuBCO) with BaHfO3 (BHO) coated conductors by the IBAD/PLD (conventional PLD) method, which showed the high in-field Ic values. However, in order to realize REBCO with BMO coated conductors for industrial and commercial applications, the much higher uniformity of not only longitudinal and but transversal Ic distributions of long coated conductors with high in-field performance is required. We have tried to develop the long EuBCO with BHO coated conductors by the in-plume (plane-plume) PLD method with high deposition rate of about 24 nm/s to obtain high in-filed performance and low production cost. More recently, we fabricated the 105 m long EuBCO with BHO coated conductors with high uniformity of longitudinal Ic distributions of 2.54 % (STDEV) by the in-plume (plane-plume) PLD method comparing with coated conductors by the conventional PLD method. We measured each Ic value of 8 filaments of 581 µm in width and slot of 20 µm in width for 0.6 m long EuBCO with BHO coated conductors by in-plume (plane-plume) PLD method. Ic distribution in a width direction of the EuBCO with BHO coated conductors by in-plume (plane-plume) PLD method is more uniform than that of the conventional PLD method.