Conceptual design of tungsten monoblock components for KSTAR divertor

For KSTAR divertor, tungsten (W) monoblock has been considered as plasma facing components. W monoblock components consist of three parts; pure W as the plasma facing material, oxygen-free high conductive copper (Cu-OFHC) as the interlayer and CuCrZr alloy as the tube. Finite element analysis (FEA) is performed by using ANSYS WORKBENCH. In this paper, the hydraulic thermo-mechanical analysis is performed to investigate the optimal design parameters and the expected fatigue lifetime under the operating conditions in KSTAR. The design parameters, such as W armour thickness, monoblock side thickness and Cu-OFHC interlayer thickness, were found out by performing the steady state thermo-hydraulic analysis and thermo-mechanical analysis. And then, the equivalent total strains calculated by the mechanical analysis were applied to the experimental fatigue curves for CuCrZr-IG using the optimized W monoblock shape.