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Prashanta Niraula1 Eiman Bokari1 Shahid Iqbal1 Lisa Paulius1 Matthew Smylie2 Wai-Kwong Kwok2 Ulrich Welp2 Yifei Zhang3 Asghar Kayani1

1, Western Michigan University, Kalamazoo, Michigan, United States
2, Argonne National Laboratory, Lemont, Illinois, United States
3, SuperPower Inc., Schenectady, New York, United States

The critical current density (Jc) in High Temperature Superconductor (HTS) such as Y1Ba2Cu3O7-x (YBCO) can be enhanced by introducing defects into the material. These defects can act as pinning centers to restrict the motion of magnetic flux vortices, which as a result increases the current carrying capacity of a superconducting material. One method to create vortex pinning centers in the material is to introduce nanodefects during the synthesis process. Another is to use a post-synthesis ion beam irradiation technique to further induced defects onto an existing defect landscape within HTS to further enhance Jc. Particle irradiation provides a high precision method to optimize the defect landscape for critical current. We demonstrate that proton and oxygen beam irradiation can double the Jc of YBCO coated conductors with existing nano precipitates in fields of 6 Tesla parallel to the c-axis at T=27 K. In this work, HTS coated conductors containing Barium zirconate nanorods as pre-existing defects were irradiated with 50 MeV copper ions at angles of 0o, 15oand 30o from the crystallographic c-axis. We observed moderate enhancement of Jc at 5 K at high fields in samples irradiated at 30o and a suppression in others.

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