Erlangen 2026 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.43: Poster

Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal

Investigation and characterization of a linearly extended microwave plasma source for a metal foil pump — •Tim Werz, Stefan Merli, Andreas Schulz, Matthias Walker, and Günter Tovar — University of Stuttgart, Germany

Future fusion power plants use only a fraction of the fuel materials. Being able to separate and recirculate tritium and deuterium from the exhaust gas is a critical step towards industrialization. A promising design to achieve isotope separation is a metal foil pump (MFP). The MFP utilizes superpermeation of atomic hydrogen isotopes to separate it from molecular hydrogen, helium and plasma enhancing gases. This separation technique can even be used against a pressure gradient.

In order to generate the atomic isotopes on the upstream side, the Duo-Plasmaline, a linearly extended and highly scalable microwave plasma source, is utilized. This plasma source is being investigated via a number of different analysis techniques, such as optical emission spectroscopy and Langmuir-Probes. A energy dispersive mass spectrometer is used to obtain information about the ion energy and types. The plasma density, temperature, distribution and type of ions, as well as impurities and non metalic layers on the metal foil play a critical role in its performance. Besides hydrogen species, heavier atoms and ions such as carbon, nitrogen and oxygen are being investigated.

Keywords: Metal foil pump; Microwave plasma; Diagnostics; Duo-Plasmaline