Power Exhaust scenarios for EU-DEMO

We present an analysis of possible power exhaust scenarios for EU-DEMO. We employ the SOLPS-ITER code with the newly developed Advanced Fluid Neutral model to scan a relatively wide range of neutral pressure divertor and impurity concentration in the core to test the existence of a suitable finite-extension operational space. Ideally, such a region should provide low target power fluxes, negligible erosion, high He divertor compression, and low impurity core concentration. Within the approximations of our model, we identified a non empty region where this long set of constraints can be satisfied. Here we use the constraints rm{q_{max} \l e 10 MWm-2, rm{Z_{eff} \l e 1.2} and rm{T_{e} \l e 5} eV, the latter being a proxy for detachment. This region corresponds to an upstream density within the range rm{n_{e,up} = 0.5-0.7} \ rm {n e,GW} (large but not necessarily prohibitive), Ar separatrix concentration rm{\l e 10 -3 and divertor neutral pressure ranging from 40 to 50 Pa. This is encouraging, in view of a more detailed analysis to be performed on the best-performance area.