Magnetic Shielding Effects of HTS Thick-Film Cylinder by Using Three-layered Permalloy and Three-Layered Soft-Iron Cylinders

摘要

It is a great conventience for making a large-sized magnetic shielding vessel to use the high critical temperature superconducting (HTS) thick-film. However, it is difficult to fabricate a shielding vessel with high value of the maximum shielded magnetic flux density (B_s) for the practical use. Therefore, it is necessary to imporve the value of B_s for a HTS thick-film vessel. In present paper, the value of B-s for YBCO (Y-Ba-Cu-O) thick-film cylinder is improved by super-imposing of two different kinds of three-layered ferromagnetic cylinder. The value of B_s was found to be about 145 times larger than that of single YBCO cylinder. It is also examines the theoretical analysis for the B_s. The results confirmed that an important criterion was determined for the design of large-sized vessels with effective shield for practical applications.