Strategy for solving a coupled problem of the electromagnetic load analysis and design optimization for local conducting structures to support the ITER blanket development

• We present the way of modeling transient electro-magnetic loads on local conductive domains in the large magnetic system.
• Simplification is achieved by decomposing of the problem, multi-scale integral-differential modeling and use of integral parameters.
• The intrinsic scale of loads on a localized conductor with eddy is quantified through the load susceptibility tensor.
• Solution is searched as response of a simple equivalent dynamic simulator, using control theory methods.
• The concept is exemplified with multi-scenario assessment of EM eddy loads on ITER blanket modules.

The complexity of the electromagnetic (EM) response of the tokamak structures is one of the key and design-driving issues for the ITER. We consider the specifics of the assessment of ponderomotive forces, acting on local components of a large electro-physical device during electromagnetic transients. A strategy and approach is proposed for the operative EM loads modeling and analysis that enables design optimization at early phases of development. The paper describes a method of principal simplification of the mathematical model, based on the analysis and exploiting specific features and peculiarities of the relevant technical problem, determined by the design and operation of the device and system under consideration. The application of the method for predictive EM loads analysis and corresponding numerical calculations are exemplified for the localized ITER blanket components — shield modules. The example demonstrates the efficiency of EM load analysis in complex electromagnetic systems via a set of simplified models with different scope, contents and level of detail.