Multi-Lamellar Cylindrical Magnetic Shields

Abstract

A method is described by which the shielding ratio of a system of coaxial cylinders may be rapidly computed by means of recurrence formulae. For cylinders of infinite length the method is exact and general, being applicable to the case of n coaxial cylinders, of any radial dimensions, in contact or separated by gaps, and composed of the same or of different material. The method should give reasonably correct results when applied to systems of cylinders of finite length but with closed ends. It is illustrated by numerical applications to shields with more than nineteen components.