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

Abstract 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.