Repulsed magnetization of a bulk superconductor by long and low field with temperature control

Maximum trapped field of a ring bulk superconductor by low pulsed field magnetization

“…As we have shown in the previous paper [3], experimental magnetizations with the long and low triangular-shaped pulsed field in Fig. 2 can be numerically evaluated well by using standard critical state model with local heat generation during the magnetization.…”

“…1c and d. Fig. 2 shows the long (320 ms) and low (137 mT) pulsed field in the previous experiments [2,3]. The total trapped fields with the one-dimensional Bean model are shown in Fig.…”

“…Formulations of the numerical simulation code are reported precisely in previous papers [3,4]. Macroscopic electromagnetic phenomena in HTS are described by Maxwell equations [5,6].…”

“…When low pulsed field is applied to a disc HTS with large radius and with high shielding current density, full magnetization is not obtained and trapped field is decreased by reversed current in the HTS. Repulsed magnetization technique with long and low pulsed field was reported to improve the trapped field profile in previous experiments with temperature control [2,3].…”

“…Shielding current densities are assumed changeable by controlling of temperature of the HTS by refrigerator and heater [2,3]. In one-dimensional Bean model, large trapped field is obtained in full magnetization of the ring HTS with high shielding current density and with large inner radius.…”