IBAD-PLD Method Coated Conductor with High Critical Current in a Magnetic Field

A 215.6 m long GdBa2Cu3O7-x (GdBCO) conductor has been successfully fabricated by the multi-plume and multi-turn pulsed laser deposition (MPMT-PLD) method and exhibited high critical current of 220 A at 77 K and 0 T. Furthermore, the GdBCO long conductor showed three times higher critical current of 25 A at 3 T and 77 K than that of YBCO. To demonstrate the high performance of GdBCO conductor, we fabricated a GdBCO coil. The GdBCO coil was successfully energized up to the currents of 74.2 A and the magnetic field of 0.5 T at 77 K and 184.8 A and 1.2 T at 64 K. In a liquid He excitation test (4.2 K), the GdBCO coil transported a large current of 895 A and generated 5.7 T. These large values of magnetic field and transport current are promising for the application. To increase further critical current in a magnetic field, an artificial pinning center was introduced into the coated conductor. Especially, a BaZrO3 doped GdBCO conductor exhibited high critical current more than 40 A at 3 T and 77 K for all magnetic field angles and was considered to be promising for the conductor used in a high magnetic field.