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Abstract: The edge plasma of four devices, AUG, JET, ITER and a prototypical DEMO near ignition, is modelled with B2-EIRENE with a linear neutral model, carbon impurity, and variable throughput and scrape-off layer power. The scaling from ITER to DEMO is quantified as a power law scaling in device size, and JET and AUG simulations are compared to this scaling. Compared to ITER at the same scrape-off layer power per unit device volume and the same operating point relative to the edge-based density limit, edge helium density and peak power per unit area is found to be similar, and helium influx lower, for DEMO with impurity seeding. With a full neutral model, helium parameters are improved by a factor 3. Results of core modelling show that ignited operation of DEMO is possible with the impurity seeding required to render peak power loads compatible with a helium-cooled divertor. [Copyright &y& Elsevier]

Abstract: The effect of variation of the divertor geometry in ITER is re-evaluated with the recently developed non-linear model of the transport of the neutral particles, taking into account neutral–neutral and molecule-ion collisions. The importance of the ‘dome’ for the neutral gas compression in the divertor is confirmed. Unlike earlier studies with a linear model of neutral transport, the present results show only a weak sensitivity of the divertor performance to the details of the divertor shape. [Copyright &y& Elsevier]

Abstract: The effect of carbon re-erosion in a mixed-material environment on the results of ITER edge plasma modelling is presented. Divertor performance is investigated with varying erosion rate of re-deposited carbon and varying connection length. The results are unified as scaling relations in the edge parameters, allowing meaningful comparison as model parameters are varied and providing effective boundary conditions for core plasma modelling. [Copyright &y& Elsevier]