Göttingen 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.12: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Improvement of impurity transport studies at Wendelstein 7-X by integration of 2D X-ray emission data — •Alice Bonciarelli1,2, Birger Buttenschön1, Felix Reimold1, Christian Brandt1, and The W7-X Team1 — 1Max-Planck-Institut für Plasmaphysik, Greifswald — 2Politecnico di Milano, Italy
Impurities play an important role in fusion plasmas, since their presence and distribution have a strong influence on the plasma performance: the actual amount must be kept under control, within a suitable range defined by the need to avoid plasma dilution and radiation cooling (upper limit), and by their protective function with respect to the plasma facing materials from high power fluxes (lower limit). The impurity transport determines their distribution and it can be described by convection and diffusion coefficients. These coefficients can be determined from experiments and we use the transport code pySTRAHL to forward model the impurity density evolution for given coefficients. These can, in turn, can be used to predict synthetic line-integrated signals of various diagnostics using the atomic data available in the ADAS database. It is then possible to compare the measured and simulated data using Bayesian inference analysis to obtain more realistic transport coefficients. To increase the accuracy of transport coefficients as determined by spectroscopy alone, a fast 2D x-ray tomography system is introduced into this framework. The necessary methods of data reduction and first results of the extended set of diagnostics are shown in this contribution.
Keywords: Impurities; Transport; Fusion; Stellarator