Optimization of Pulsed-Current Profile for Magnetizing High$T_rm C$Bulk YBCO Superconductors

Compared with conventional field cooling (FC) and zero field cooling magnetization methods, pulsed field magnetization (PFM) is a promising way to magnetize high-temperature superconductors (HTS) with the advantage of dramatically decreasing the size and complexity of the electromagnetic charging system. The effects of the amplitude, width, and ramp rate of the pulsed current are reported. Transient responses of the HTS to pulsed magnetic fields are discussed and analyzed. A series of three pulses was found to be adequate to magnetize the HTS monolith with optimal trapped field if proper pulse amplitudes and widths are applied. Experiments verified that the trapped magnetic fields of HTS by PFM were comparable to those obtained by FC magnetization