Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 12: Poster II
P 12.1: Poster
Tuesday, February 27, 2024, 16:30–18:30, ELP 6: Foyer
Inference of transport coefficients in helium puff modulation studies at W7-X — •Thilo Romba1, Felix Reimold1, Oliver Ford1, Peter Zsolt Poloskei1, Sebastian Bannmann1, Tabea Gleiter2, Erik Flom3, and Thomas Klinger1 — 1Max-Planck-Institute for Plasma Physics, Greifswald 17491, Germany — 2Max-Planck-Institute for Plasma Physics, Garching 85748, Germany — 3University of Wisconsin-Madison, Madison, WI 53706, USA
The precise monitoring of the impurity content and the understanding of the transport mechanisms is crucial for future fusion reactor operation due to the associated restrictions to the operational parameter space via dilution and increased radiative losses.
This work aims to analyze the transport properties of the fusion ash helium in the confined region of the optimized stellarator Wendelstein 7-X (W7-X) [1]. Spatially and temporally densities of He2+ are measured using charge exchange recombination spectroscopy (CXRS) [2]. To introduce a time variation in the local density response, periodic helium puffs outside the confined region are imposed as the helium source.
Based on the local helium density response measured, local diffusion and convection coefficients of the helium particle transport are inferred with the 1.5D transport code aurora [3]. Experiments over varying magnetic configurations show dominant anomalous transport in all cases, consistent with previous results for higher Z impurities [4].
[1] Erckmann 1997, [2] Fonck RSI 1985, [3] Sciortino PPCF 2021, [4] T Romba PPCF 2023
Keywords: Wendelstein 7-X; Charge exchange recombination spectroscopy; Impurity transport