  High temperature superconducting (HTS) bulks or stacks of coated conductors
(CCs) can be magnetized to become trapped field magnets (TFMs). The magnetic
fields of such TFMs can break the limitation of conventional magnets (<2 T), so
they show potential for improving the performance of many electrical
applications that use permanent magnets like rotating machines. Towards
practical or commercial use of TFMs, effective in situ magnetization is one of
the key issues. The pulsed field magnetization (PFM) is among the most
promising magnetization methods in virtue of its compactness, mobility and low
cost. However, due to the heat generation during the magnetization, the trapped
field and flux acquired by PFM usually cannot achieve the full potential of a
sample (acquired by the field cooling or zero field cooling method). The
multi-pulse technique was found to effectively improve the trapped field by PFM
in practice. In this work, a systematic study on the PFM with successive pulses
is presented. A 2D electromagnetic-thermal coupled model with comprehensive
temperature dependent parameters is used to simulate a stack of CCs magnetized
by successive magnetic pulses. An overall picture is built to show how the
trapped field and flux evolve with different pulse sequences and the evolution
patterns are analyzed. Based on the discussion, an operable magnetization
strategy of PFM with successive pulses is suggested to provide more trapped
field and flux. Finally, experimental results of a stack of CCs magnetized by
typical pulse sequences are presented for demonstration.
