Stress analysis of JT-60U tokamak

Stress analyses of the JT-60U (JAERI Tokamak-60 Upgrade) vacuum vessel and the poloidal-field coil (PFC) support structures are described. A method for treating the nonlinear friction force acting on PFC support structures from the PF coils is proposed. The result of the stress analysis indicates the validity of the present method. Various candidates for the vacuum vessel structure and the support method are compared to determine the basic concept of the machine. The multi-arc cross-section vacuum vessel with midplane supports proved to have sufficient strength through both the static and the dynamic stress analyses, prompting its selection as the JT-60U vacuum vessel. The dynamic coupled effect between the PFC support structures and the vessel is estimated to assess the strength of the clamps which fix the structures from the base.<>