Global computational models for analysis of electromagnetic transients to support ITER tokamak design and optimization

The International thermonuclear experimental reactor (ITER) concept implies a variety of operating modes, design complexity and demand for high reliability. A point of the major concern is the transient electromagnetic (EM) effects. Complex electromagnetic behaviour due to strong inductive coupling, the presence of numerous field sources, and a range of plasma burn scenarios requires careful predictive simulations. Different mathematical models applicable for the design and optimization studies are reviewed. Practical experience in developing detailed global models to investigate eddy currents, EM forces and other EM loads is summarized. Two numerical techniques implemented in the dedicated computer codes are compared, and the validity of relevant models is discussed.