SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 19: Magnetic Confinement V/HEPP VIII
P 19.1: Hauptvortrag
Donnerstag, 23. März 2023, 17:30–18:00, CHE/0089
Numerical and experimental investigations of a linear microwave plasma source for metal foil pumps for DEMO — •Stefan Merli1, Andreas Schulz1, Matthias Walker1, Yannick Kathage2, Stefan Hanke2, Christian Day2, and Günter Tovar1 — 1IGVP, University of Stuttgart, Stuttgart, Germany — 2Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
In future fusion power plants like DEMO, minimizing the tritium fuel inventory is a critical design issue. Hydrogen isotopes have to be separated from the exhaust gas close to the diverter so that they can be immediately recirculated. At KIT a direct internal recycling system is being developed using a metal foil pump (MFP) which can selectively separate hydrogen isotopes by superpermeation even against a pressure gradient. For this process to work, the hydrogen must be in the form of atoms or ions, which is achieved with a linear microwave plasma source, the Duo-Plasmaline.
Since the Duo-Plasmaline is an integral part of the MFP, hydrogen plasmas from the Duo-Plasmaline are being investigated numerically and experimentally at the University of Stuttgart. In the numerical model the transport of electrons and heavy species are calculated self-consistently with the microwave el. field and a reduced set of plasma chemical reactions. Since the MFP will be in close proximity to the torus, the influence of strong magnetic fields up to 1 T is investigated. The results are compared to investigations in the experiment FLIPS with up to 250 mT. Results of the performance of the Duo-Plasmaline and the MFP from the HERMESplus experiment are presented as well.