Quasi-Stationary Magnetic Shielding Properties of Thick Spherical Shells with Equatorial Seams

Material shields may be mechanically damaged, caus­ ing cracks or seams in the shield walls and changes in their magnetic shielding effectiveness. As a canonical three-dimensional model, the interaction of an exter­ nal, quasi-stationary, uniform magnetic field with a thick shield is investigated, which consists of two identical, thick semi-spherical shells in intimate con­ tact with each other. The problem is treated analyti­ cally using perturbational techniques and the complex shielding ratio calculated. The results obtained have potential applications in the design of various elec­ tromagnetic shields.