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Magnetic flux diffusion through HTS shields

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3 Author(s)
Havenhill, A.D. ; Dept. of Earth Sci. & Phys., South Dakota Univ., Vermillion, SD, USA ; Wong, K.W. ; Fan, C.X.

Slow field leakage in a polycrystalline superconducting cupshield placed in an external axial field (H/sub ext/) much weaker than H/sub C1/ shows a diffusive time dependence with a time scale of 10/sup 2/ s. As the field strength increases but is still less than H/sub C1/, a logarithmic time dependence of 10/sup 2/ s time scale is observed. It is shown that this logarithmic time dependence is a result of flux line diffusion between superconducting grains rather than fluxoid avalanches or flux bundle creep.

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Applied Superconductivity, IEEE Transactions on  (Volume:8 ,  Issue: 2 )