Influence of the radial plates on the transient oscillations in the ITER toroidal field (TF) model coil using a finite element approach

The transient electrical behavior of the racetrack-shaped TF model coil for the International Thermonuclear Experimental Reactor (ITER) during an ener gy dump has been investigated using a 3D finite element model. Detailed mod eling of the radial plates inherently takes into account the eddy currents in the steel structures. Hence, unlike recent investigations using ordinary lumped network models, the influence of the radial plates on the damping a nd attenuation of the transient oscillations could be considered. Transient analyses for rise times from 0.5 ms to 500 ms have been performed. Additio nal AC analyses yielded the transfer function of the coil. Alternatively, a lumped network model was established. Frequency dependent values of the ne twork elements, i.e. effective resistances, self and mutual inductances, ha ve been determined using 2D FE models in a frequency range up to 500 kHz;. Thus, it was possible to implement frequency dependent effects into the net work model as well.