On the present status of the EU demo H&CD systems, technology, functions and mix

Under the umbrella of the EUROfusion Consortium and within the Power Plant Physics and Technology (PPPT) Conceptual Design Activities, the project Heating and Current Drive (H&CD) conducts a number of design activities and developments for a next generation clean and environmental friendly, long pulsed (~2 hours) Demonstration fusion power plant (DEMO). This paper covers the results of the most important state-of-the-art and cutting edge technologies for the H&CD systems, as defined in the European Fusion Roadmap and in more detail specified in the Annual Work Plans (AWPs) in the Work-Package H&CD (WPHCD): (i) Gyrotron developments up to 240 GHz with multi-stage-depressed collector (MSDC) energy recovery for the Electron Cyclotron (EC) system; (ii) Neutral beam (NB) injector investigations with gas or alternatively photo-neutralization in the range of 25 - 35 MW as a modular 1 MeV injector type with reduced Cs consumption sources or alternatively volume-production based non-Cs sources; (iii) Ion Cyclotron (IC) antenna conceptual design for a distributed antenna, representing a new type of design and a transition from the commonly used port plugged antennas.