Supershielding: Confinement of Magnetic Fields

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Abstract
In open-shield systems, we have derived current conditions that lead to remarkable magnetic-field confinement, which we call “supershielding.” The freedom to vary both primary and shield currents is important in solving the conditions. Solutions leading to very effective shielding are illustrated by the simple system of two parallel flat strips. Generalizations include other geometries, internal shielding, and electric-field confinement. An industrial coil design serves as a reference for practical issues. We discuss mathematical limits, via a “seesaw” approach, to “perfect shielding.”

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