A reduced model for the impact of divertor physics on scrape-off layer turbulent transport

Understanding the plasma transport at the boundary of magnetic confinement devices is needed to improve both particle and power exhaust. The variety of complex phenomena occurring in this region leads to a lack of description of this transport. In this contribution, a generic model of 2D interchange turbulence is considered. This description of the turbulence is able to recover edge plasma properties in L-mode limited discharges¹. An inclusion of the plasma-neutrals interactions results in a model able to predict scrape-off layer (SOL) widening in cases of high-density regimes. To determine the link between the upstream, target, and X-point conditions in various L-mode regimes, we scan the control parameters (leg length, upstream density, power crossing the separatrix) with the UEDGE 1D code. This database is then used to train a neural network which will be used as input of the turbulent model to quantitatively predict SOL widening in high density regimes.

¹ M. Peret et al., Nuclear Fusion 61 (2021) 046045