Strategy of Structural Analysis of W7-X Magnet System

The Wendelstein 7-X (W7-X) stellarator project goal is to demonstrate that the stellarator is a viable option for a fusion power-plant. The W7-X is in advanced construction phase and has entered the assembly phase in Greifswald, Germany. The W7-X "pentagonal" basic magnet system is highly sensitive to the parameter variations; therefore the strategy of the structural analysis with the ultimate goal to create a tree of numerical models, which has to reliably predict stellarator structural behaviour, is in development and implementation phases. This paper gives an overview of the strategy and focuses on challenging boundary conditions and the most interesting results of the analyses