Erlangen 2018 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Plasma Wall Interaction I - Poster

P 18.2: Poster

Mittwoch, 7. März 2018, 16:15–18:15, Zelt Ost

Current results of the ITER relevant large RF driven negative ion beam test facility ELISE — •Dirk Wünderlich, Ursel Fantz, Bernd Heinemann, Werner Kraus, Rudi Riedl, and the NNBI team — Max- Planck- Institut für Plasmaphysik, 85748 Garching, Germany

The negative ion beam test facility ELISE is an important intermediate step in the European R&D roadmap for the neutral beam injection (NBI) systems of ITER. The ELISE ion source has half the size of the ITER source and its aim is to demonstrate the ITER requirements regarding the extracted current density (329 A/m² in hydrogen, 286 A/m² in deuterium), the electron-ion-ratio (< 1) at the required filling pressure (≤0.3 Pa) and the pulse length (1000 s in hydrogen, one hour in deuterium).

Typically the source performance is limited by the amount and temporal stability of the co-extracted electrons, in particular in deuterium operation. In the last years several valuable tools for counteracting this increase of the electrons have been identified, mainly modifying the magnetic and electric field topologies close to the extraction system and improving the caesium management.

The presentation summarizes and discusses the latest results obtained at ELISE: using the above-mentioned measures, in short pulses (10 s beam) the ITER values have almost been reached. Additionally, the current densities obtained during long pulses were drastically increased, reaching around 66 % of the ITER requirement both in hydrogen and deuterium.