Induction-field calculations and their application to measurements of conductivity distributions in cylindrical plasmas

The problem of determining conductivity distributions from measurements on magnetic loops (induction coils) is examined. Maxwell's equations are written for a cylindrically symmetric system allowing for radial variations in conductivity, and solved numerically for specific types of distribution similar to those found in plasma experiments. Methods are described by which the field impedance (E/H) at the boundary of the medium can be found and used to characterise the distribution.