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Abstract
Superconducting stacks and bulks can act as very strong magnets (more than 17 T), but they lose their magnetization in the presence of alternating (or ripple) transverse magnetic fields, due to the dynamic magneto-resistance. This demagnetization is a major concern for applications requiring high run times, such as motors and generators, where ripple fields are of high amplitude and frequency. We have developed a numerical model based on dynamic magneto-resistance that is much faster than the conventional Power-Law-resistivity model, enabling us to simulate high number of cycles with the same accuracy. We simulate demagnetization behavior of superconducting stacks made of 10–100 tapes for up to 2 million cycles of applied ripple field. We found that for high number of cycles, the trapped field reaches non-zero stationary values for both superconducting bulks and stacks; as long as the ripple field amplitudes are below the parallel penetration field, being determined by the penetration field for a single tape in stacks. Bulks keep substantial stationary values for much higher ripple field amplitudes than the stacks, being relevant for high number of cycles. However, for low number of cycles, stacks lose much less magnetization as compared to bulks.
Highlights
Superconducting stacks and bulks can act as very strong magnets, but they lose their magnetization in the presence of alternating transverse magnetic fields, due to the dynamic magneto-resistance
In both cases the tape is fully magnetized at the end of the field cooling magnetization, and we do not see any relaxation after magnetization since we have used Critical State Model in the E(J) relations for Dynamic Magneto-Resistance (DMR) model
For DMR model, the change is only seen in the width of the tape, since we use only single element in the tape thickness (Fig. 3d), in contrast to Critical State Model, where we have up to 24 elements in the tape thickness (Fig. 3b)
Summary
Superconducting stacks and bulks can act as very strong magnets (more than 17 T), but they lose their magnetization in the presence of alternating (or ripple) transverse magnetic fields, due to the dynamic magneto-resistance. It is the goal of this paper to model cross field demagnetization for high number of cycles (up to millions) using a unique approach involving dynamic magneto-resistance.
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