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P: Fachverband Plasmaphysik

P 25: Poster III

P 25.23: Poster

Donnerstag, 29. Februar 2024, 16:30–18:30, ELP 6: Foyer

Atomic hydrogen density measurements with TALIF above a sample surface — •Julian Hörsch, Christan Wimmer, and Ursel Fantz — Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2D-85748, Garching bei München, Germany

Two photon Absorption Light Induced Fluorescence (TALIF) is a diagnostic technique that will be used in an upcoming research program in combination with other diagnostics to characterize the production of negative hydrogen ions in negative ion sources. These negative hydrogen ions can be produced by surface conversion of neutral hydrogen atoms on a low work function material as cesium. As TALIF allows the direct determination of the density and temperature of neutral hydrogen atoms it is of particular interest for characterizing the negative ion production mechanisms. In this project TALIF is applied to a small-scale experiment to study the available density of neutral hydrogen atoms for negative ion production above a sample, but without negative ion production itself. The TALIF signal is measured with varying distance to the surface of the sample and for various sample materials. In particular, the influence of the distance to the surface on the hydrogen properties and the isotopic differences between hydrogen and deuterium are investigated.

Keywords: TALIF; negative hydrogen ions; surface; neutral hydrogen density