Mechanical Analyses of Turn & Ground Insulation for CFETR CSMC

The composite insulation materials used in the fusion device superconductivity magnet must have excellent thermal behavior, sufficient dielectric strength, rigorous mechanical performance etc. to adapt the severe multi-field operation environment. Glass fiber reinforced plastics are extensively used for insulation in fusion magnet. In view of its outstanding fabrication and material performances, it is also adopted as the turn & ground insulation for China Fusion Engineering Test Reactor (CFETR) Central Solenoid Model Coil (CSMC). During the cooling down stage of CSMC, large normal stress will be generated in the & ground insulation components. While in the energization stage, besides the normal stress, the shear stress will be generated. If the insulation components are teared down, unanticipated damage may happen on CSMC. Thus, in order to check the current structural design of insulation components, the representative turn insulation and ground insulation components are built. The mechanical analyses are launched subsequently. During the analyses, the multi-load cases are considered. And the detailed shear stress and normal stress in the insulation components are calculated and evaluated based on the insulation material property requirements.