Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 12: Poster II

P 12.26: Poster

Tuesday, February 27, 2024, 16:30–18:30, ELP 6: Foyer

Research plan for investigating differences and similarities between hydrogen and deuterium operation in negative ions sources for fusion applications — •Joey Rubin, Nicolaas den Harder, Dirk Wuenderlich, Christian Wimmer, and Ursel Fantz — Max-Planck-Institut für Plasmaphysik (IPP), Boltzmannstr. 2, 85748 Garching

Negative ion sources for fusion applications face demanding requirements. The ITER NBI system requires extracted negative ion current densities of 329 A/m² in hydrogen for 1000s and 286 A/m² in deuterium for 3600s, with co-extracted electron fraction below 1 for both isotopes. Testbeds BATMAN Upgrade and ELISE in operation at IPP Garching, have successfully demonstrated the feasibility of meeting these requirements in hydrogen. However, deuterium operation presents a challenge due to a higher and more unstable co-extracted electron current density. The increase in co-extracted electron current density limits the pulse length as the heat load on the extraction reaches the limit. The focus of this thesis is to delve into the physics underlying the different performance of negative ion sources for fusion in hydrogen and deuterium. The present poster outlines the research plan designed to reach this objective.

Keywords: negative ion source; isotope effect