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High temperature superconducting (HTS) bulks or stacks of coated conductors(CCs) can be magnetized to become trapped field magnets (TFMs). The magneticfields of such TFMs can break the limitation of conventional magnets (<2 T), sothey show potential for improving the performance of many electricalapplications that use permanent magnets like rotating machines. Towardspractical or commercial use of TFMs, effective in situ magnetization is one ofthe key issues. The pulsed field magnetization (PFM) is among the mostpromising magnetization methods in virtue of its compactness, mobility and lowcost. However, due to the heat generation during the magnetization, the trappedfield and flux acquired by PFM usually cannot achieve the full potential of asample (acquired by the field cooling or zero field cooling method). Themulti-pulse technique was found to effectively improve the trapped field by PFMin practice. In this work, a systematic study on the PFM with successive pulsesis presented. A 2D electromagnetic-thermal coupled model with comprehensivetemperature dependent parameters is used to simulate a stack of CCs magnetizedby successive magnetic pulses. An overall picture is built to show how thetrapped field and flux evolve with different pulse sequences and the evolutionpatterns are analyzed. Based on the discussion, an operable magnetizationstrategy of PFM with successive pulses is suggested to provide more trappedfield and flux. Finally, experimental results of a stack of CCs magnetized bytypical pulse sequences are presented for demonstration.

superconductor science and technology/superconductor science and technology

Simulation and experiments of Stacks of High Temperature Superconducting  Coated Conductors Magnetized by Pulsed Field Magnetization with Multi-Pulse  Technique