Reconstruction of electromagnetic loads during disruptions in ITER

This paper presents a computational tool able to reconstruct electromagnetic (EM) loads due to disruptions in ITER. This will be one of the algorithms running in the ‘Tokamak Systems Monitor’, currently under development, whose main purpose is the evaluation of the overall behaviour of the ITER tokamak and its subsystems, by interpreting the available experimental data provided by engineering-oriented sensors. The input of the procedure consists of magnetic measurements (coil current measurements, discrete magnetic sensors, saddle loops, flux loops, Rogowski coils); the output is the EM (Lorentz) force density and its integrals (net force, moments) on the structures of interest. The procedure needs only a few minutes of computation on standard computer architecture, once all pre-computations have been carried out, hence it is suitable for inter-shot analysis. The same procedure can be in principle applied also to other fusion devices, provided that the required diagnostics is available.