Modeling of the electromagnetic fields in the space shielded by thin conducting shells

Hybrid method for calculating quasi-static fields inside the space shielded by thin conducting shell is considered. At the first stage of this approach the electric vector potential is calculated at the inner surface of the shield by solving integro-differential equation. Special current density distribution along the shell thickness is considered for the case of good shielding. At the second stage the derived distributions of the eddy currents are used to set boundary conditions for the scalar magnetic potential inside the shielded space. This potential is calculated by utilizing finite element technique. Considered algorithm allows avoiding errors caused by subtracting similar absolute values of the fields induced by primary and secondary sources. Quality and accuracy of the derived numerical solutions are verified by investigation the test problem for which analytical solution is obtained.