Modelling of pulsed and steady-state DEMO scenarios

Scenario modelling for the demonstration fusion reactor (DEMO) has been carried out using a variety of simulation codes.Two DEMO concepts have been analysed: a pulsed tokamak, characterised by rather conventional physics and technology assumptions (DEMO1) and a steady-state tokamak, with moderately advanced physics and technology assumptions (DEMO2).Sensitivity to impurity concentrations, radiation, heat transport models has been investigated.For DEMO2, the impact of current driven non-inductively by Neutral Beams has been studied by full MonteCarlo simulations of the fast ion distribution.The results obtained are a part of a more extensive R&D effort carried out in the EU in order to develop a viable option for a DEMO reactor, to be adopted after ITER for fusion energy research.