CALCULATION OF EDDY-CURRENT DENSITIES AND FORCES AROUND LARGE SUPERCONDUCTING COILS FOR NUCLEAR-FUSION

The reliable operation of the superconducting magnet systems used for the magnetic confinement in nuclear fusion research requires the abili ty of a fast discharge of the stored magnetic energy. The correspondin g magnetic field variation gives rise to high eddy currents by inducti ve coupling with surrounding conductive components. The eddy current f orces can lead to a mechanical overload of some of these components. A simple numerical-analytical method was developed in order to calculat e these forces. This method is presented and compared with the Finite Element Method.