Output data from simplified electromagnetic models for structure analysis of main ITER components

The distribution of forces, acting on components of the electromagnetic (EM) system considered herein has been analyzed with the use of simplified models and equivalent dynamic simulators for a variety of plasma event scenarios. The work was aimed at the formulation of the problem of the global force balance and the approach to its resolution, identification of the main factors of the force interaction between components, development of the numerical models for qualitative and quantitative assessment of the problem and relevant parameters and the computations and assessment of the results. The use of equivalent simulators with elimination of redundant details and degrees of freedom (DOFs) principally reduces computational complexity of the problem. The selection (identification) of the equivalent system on the basis of the evaluation of the significance of impacts on the parameter of interest provides the effective and natural filtering of secondary or irrelevant information. The finding of equivalent minimum dynamic systems (EMDS) opens, at a certain rate of computations, a way to develop real-time simulators. The paper describes simplified models, the principles of definition (synthesis) and use of EMDS, the structure of the database (magnitude and time evolution of distributed and integral basic parameters) required for the evaluation of the EM loads and examples of the data.

► We present the approach to assessment of global balance of electro-magnetic forces in the tokamak.
► It is proposed to decompose the problem to several specific, according to the matrix of interactions.
► The use of equivalent minimum dynamic systems (EMDS) and methods of operational analysis principally simplifies the computations; that opens a way to develop real-time simulators.
► The principles of synthesis and use of EMDS are discussed.
► The assessment of poloidal eddy current in the ITER vacuum vessel and corresponding loads is given as an example of using new technique.