This paper presents a fully three-dimensional (3D) electromagnetic nonlinear model for superconducting cable samples. The model is characterized by a time domain integral formulation of Maxwell’s equations in the magneto-quasistatic limit coupled to a nonlinear characteristic of conductors. In order to account for the subcable wrapping, contact resistances among adjacent conductors and strand coating, infinitely thin resistive barriers are accounted for in the model. The model is fed through an externally applied magnetic field as well as by an external feeding circuitry, which interacts with the integral 3D model by means of voltage- and current-driven electrodes. The model is discretized using the edge elements and, in particular, a suitable linear combination of them are used as basis and test functions, to account for the presence of the electrodes as well as for multiply connected conducting domains. The model is applied to the analysis of an ITER full-size CICC sample. Key surface parameters are identified from available transverse resistance measurements. The analysis presented here, compared to the experimental results, shows the consistency of the model with the experiments.
Electromagnetic 3D analysis of an ITER full-size cable-in-conduit conductor sample
ZAMBONI, Walter
2007-01-01
Abstract
This paper presents a fully three-dimensional (3D) electromagnetic nonlinear model for superconducting cable samples. The model is characterized by a time domain integral formulation of Maxwell’s equations in the magneto-quasistatic limit coupled to a nonlinear characteristic of conductors. In order to account for the subcable wrapping, contact resistances among adjacent conductors and strand coating, infinitely thin resistive barriers are accounted for in the model. The model is fed through an externally applied magnetic field as well as by an external feeding circuitry, which interacts with the integral 3D model by means of voltage- and current-driven electrodes. The model is discretized using the edge elements and, in particular, a suitable linear combination of them are used as basis and test functions, to account for the presence of the electrodes as well as for multiply connected conducting domains. The model is applied to the analysis of an ITER full-size CICC sample. Key surface parameters are identified from available transverse resistance measurements. The analysis presented here, compared to the experimental results, shows the consistency of the model with the experiments.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
