Abstract

The critical current density (Jc) of high critical temperature (Tc) copper-oxide superconductors is an important parameter in magnetic shielding. However, it was determined that the value of Jc was not closely related to the degree of magnetic shielding. The degree of shielding can be improved by the use of a configuration of superimposed double cylinders constructed of a copper-oxide superconductor. Experimental results indicate that the characteristics of the double-cylinder system (such as the effect of the excitation magnetic field on the magnetic field within the cylinders, and the distribution of the magnetically shielded field along the axial direction of the cylinders) are improved over those of single superconducting cylinders.

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