In this paper, the 1D physics-based dynamic scrape-off-layer (SOL) model DIV1D is extended to include molecular interactions and the effects of finite atomic flow velocity parallel to the magnetic field lines. The addition of molecular interactions, atomic flow, and geometric settings in DIV1D leads to qualitative agreement with stationary 1D profiles obtained by mapping 2D SOLPS-ITER simulations for the parallel heat flux, electron temperature, electron density, plasma flow velocity, atomic density, atomic flow velocity and molecular density. Steady-state simulations of DIV1D show higher levels of particle, momentum and heat losses through collisional-radiative interactions between ions and molecules, compared to ions and atoms, in the divertor. Density ramp simulations show that DIV1D is now capable of dynamically transitioning between different SOLPS-ITER equilibria for MAST-U, capturing behaviour throughout the target particle flux rollover into deeply detached regimes.
This paper extends a 1D physics-based model, DIV1D, to include molecular interactions and the effects of atomic flow velocity. The additions lead to better agreement with 2D simulations for MAST-U, capturing particle, momentum, and heat losses through collisions between ions and molecules. The model can now dynamically transition between different equilibria, simulating the target particle flux rollover into detached regimes.