Hannover 2020 – scientific programme

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P: Fachverband Plasmaphysik

P 10: Poster Session 2

P 10.7: Poster

Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof

Conceptual design study of an Energy Recovery System for the DEMO NBI — •Giuseppe Starnella, Christian Hopf, and Niek den Harder — Max-Planck-Institut für Plasmaphysik, Garching, Germany

The commercial viability of a fusion power plant requires Neutral Beam Injectors with a high energy efficiency. The main limitation on the ITER NBI is represented by the gas neutralisation efficiency. In this regard, the plasma neutraliser is one of the promising new technologies that are under investigation for the DEMO NBI. As an alternative option, the concept of Energy Recovery makes the current technique of gas neutralisation still a viable choice. The idea is to recover the energy of the residual ions of the neutralisation process by decelerating them onto electrically biased collectors, after separating the negative and positive ions from the neutral beam in opposite directions. We present the CAD model of the conceptual design of an ERS and its integration into an NBI ITER-like beamline. A 3D ion optics code is used to simulate the ion trajectories. The ERS efficiency and the relative improvement of the NBI wall-plug efficiency are studied as functions of the residual ion deceleration energy. We show that a recovery energy of 50 keV allows the collection of all the ions. The impact of the beamline new configuration on the gas density profile is also investigated, especially in terms of neutral beam and residual ion losses.