Abstract
Ideal magnetic shielded vessels can be realized by making use of a high-critical temperature superconductor (HTS). Use of such shielding does not, however, generally satisfy the maximum shielded magnetic flux density B s required of an HTS vessel for practical applications. The present authors have improved the value of B s by the superposition of a ferromagnetic cylinder over an HTS cylinder, termed the superimposed cylinder. The evaluation of the magnetic shielding effects was limited to the superimposed cylinder, in order to simplify the theoretical analysis. Nevertheless, little is known of the resulting characteristics and evaluation procedures when changing the size of the air gap δ between the HTS and ferromagnetic cylinders for applications of an external magnetic field B ex less than the value of B s. The values of B s were systematically measured by for different values of δ, and in addition, were theoretically analyzed. It was found that the experimental values of B s agreed well with theoretical values. Furthermore, measurements were taken of the magnetic noise power spectrum for various values of δ, with the use of the HTS dc-SQUID system and spectrum analyzer. From these results, the characteristics of the magnetic behavior for different values of δ within the superimposed cylinder were clarified. In addition, an important criterion is discussed for the design of an effective magnetic shielding vessel.
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