Structural Stress Analysis of the CFETR Central Solenoid Model Coil

China Fusion Engineering Test Reactor (CFETR) central solenoid (CS) model coil (CSMC) made with cable-in-conduit conductor superconductor had been developed in the Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China. The highest field of CSMC is 12 T when the running current is 47.65 kA, and the largest magnetic field change rate is 1.5 T/S. CSMC mainly consists of two Nb3Sn coils and three outer NbTi coils, buffer zone, feeders and joints, and preload supports. The inner diameter of the coil is 1500 mm, and the outer diameter is 3520 mm. Stress analyzes were performed using coupled solver for simultaneous structural, thermal, and electromagnetic analysis. Based on the generalized Hooke's law, orthotropic smeared property used for the CSMC winding pancake is calculated with one so-called “unit cell” finite-element model of the jacket and insulation. A global finite-element model was created based on the design geometry data to investigate the mechanical property of CFETR CSMC.