Analysis of Selected Mechanical Details of the ITER Magnet System

The magnet system of the full sized ITER (Final Design Report (FDR) version), has progressed to the point where basic sizing has been accomplished and local details are being addressed. The ITER US Home Team has worked on global structural models of the magnet system as well as local models of components that are strongly coupled with the global behavior. Areas of interest include the crown – monorail -slot interaction, proposed outerintercoil structure (OIS) cover plates, and case wall thickness studies. The root of the crown slot is highly stressed. Specialized fabrication techniques will be needed to eliminate flaws from this area to meet fatigue criteria. The fluted geometry of the outer cylinder was not found to contribute to the Out-of-Plane (OOP) support of the The inner leg. TF case thickness was studied and it was concluded that the sidewalls of the case may be thinned up to 7cm in selected regions between the OIS. A cover added to the outside of the middle OIS was found to improve the shear loads at the flange pins. The use of 20 vs. 10 support structures for PF 1 and 9, is recommended.