Design Space Exploration of K-Demo Using Novel Method for the Minimum Build Determination

Under the framework of a conceptual design study for the Korean fusion demonstration reactor (K-DEMO), a scoping study for design space and cost assessment of the K-DEMO has been performed. A novel method was applied to determine the minimum major radius, $R_{0}$ , and the resulting minimum reactor size, which lead to a reduced reactor cost. The impacts of a wide range of physics, technology, and system parameters on reactor size were addressed. With the design goals of a net electric power >500 MW and steady-state operation, a prospective design space according to the level of the physics and technology was drawn. From a sensitivity analysis of the minimum major radius to the input parameters, it was found that sensitivities to normalized plasma beta $\beta _{N}$ , safety factor $q_{\mathrm {edge}}$ , Greenwald density fraction $n_{e}/n_{G}$ , confinement factor $H$ , and elongation $\kappa $ are relatively strong.