Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 22: Poster Surface Reactions

O 22.1: Poster

Monday, March 17, 2025, 18:00–20:00, P2

TRACE/TRIADE: A setup to investigate tritium accumulation of solids — •Marie-Christine Schäfer, Dominic Batzler, James Braun, Robin Größle, Philipp Haag, Elizabeth Paine, Marco Röllig, Marius Schaufelberger, and Kerstin Trost — Tritium Laboratory Karlsruhe, Eggenstein-Leopoldshafen, Germany

In the context of the KArlsruhe TRItium Neutrino experiment (KATRIN), sufficient knowledge of the accumulation of tritium on surfaces is crucial for minimising systematic effects, thus optimising the experiment. On a bigger scale, the understanding of these specific tritium gas-surface interactions is relevant when it comes to fusion reactors and their fuel cycles. In search of materials with small tritium memory effects, the Tritium Activity Chamber Experiment (TRACE) at Tritium Laboratory Karlsruhe (TLK) provides the possibility of exposing solid samples to high purity tritium gas while monitoring the near-surface activity via beta-induced X-ray-spectrometry (BIXS). Similarly, the TRItium Adsorption Desorption Experiment (TRIADE) also measures the tritium accumulation via the BIXS method but is being upgraded to additionally provide the option of studying adsorption and desorption processes at temperatures down to 100 K. For this, a newly designed sample holder is currently being tested. Besides investigating the tritium accumulating properties of different materials, the compatibility with UV/ozone in the context of decontaminating the surfaces is also of relevance. For this, experiments with an additional setup are set to be conducted in the near future. This contribution will present the TRACE/TRIADE setups as well as their planned modifications.

Keywords: sorption; tritium; BIXS; decontamination; ozone