Integrated core-SOL simulations of tritium burnup fraction for CFEDR with the COREDIV code

The tritium burnup fraction (f_burnup) for China Fusion Engineering Demo Reactor (CFEDR) conventional H-mode scenario has been systematically investigated using the integrated core and scrape-off layer (core-SOL) simulations with the COREDIV code. The effects of key factors that influence f_burnup have been studied, including fueling deposition location, particle-to-thermal diffusivity ratio (D/χ), seperatrix electron density n_e,sep and various impurities. Simulations indicate that f_burnup in CFEDR scenario is more optimistic and higher than the previous China Fusion Engineering Testing Reactor (CFETR) scenarios, mainly attributed to increased plasma temperature in the core region. The f_burnup in CFEDR is sufficient to achieve the required tritium breeding ratio (TBR) for tritium self-sufficiency, particularly with fueling penetration deeper than ρ = 0.95. Achieving a high f_burnup is feasible through optimizing fueling deposition, controlling edge plasma density and impurity levels. The modelling results provide valuable insights and suggestions for optimizing CFEDR scenarios and developing advanced fueling systems.