Static and Transient Electromagnetic Features of the EFDA Dipole

The EFDA dipole (EDIPO) is a superconducting magnet made of a pair saddle-shaped winding packs enclosed in a circular iron yoke which, in turn, is contained inside an austenitic steel cylinder. In this paper the key electromechanical features of the dipole are presented. As far as the static analysis is concerned, the electromagnetic and mechanical behavior of the whole system has been analyzed by means of finite element models, in order to evaluate, in particular, the peak field on the cables, the stress limit in the jacket and the shear stresses in the insulation. As far as the transient analysis is concerned, the system behavior during a current dump has been simulated by means of a coupled electromagnetic-circuit model that takes into account the non linearity of the ferromagnetic material and the reaction field due to the eddy currents in the steel cylinder. Another important element in the AC analysis consists in the assessment of the conductor losses during AC operation, since they provide the heat loads to be evacuated by the cooling system. The results of this last issue are also presented.