SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 11: Poster I
P 11.44: Poster
Mittwoch, 22. März 2023, 14:00–15:30, HSZ EG
Experimental impurity transport analysis for the tokamak plasma edge — •Tabea Gleiter1,2, Ralph Dux1, Francesco Sciortino1, and the ASDEX Upgrade Team3 — 1Max-Planck-Institut für Plasmaphysik, Garching, Germany — 2Physik-Department E28, Technische Universität München, Garching, Germany — 3Authors of U. Stroth et al. 2022 Nucl. Fusion 62 042006
Impurity transport in the pedestal and SOL region impacts energy confinement and radiative power exhaust in tokamaks. However, thorough understanding is lacking for many confinement modes. This includes promising regimes for future reactor scenarios without type-I ELMs, such as the quasi-continuous exhaust (QCE) mode.
A series of impurity seeded (Ne, Ar or N) discharges in various confinement modes was conducted at ASDEX Upgrade. Their experimental setup was tailored for high resolution charge exchange recombination spectroscopy (CXRS) measurements at the plasma edge. From the observed line radiation, density profiles of multiple impurity charge states are derived, making use of a neutral beam model, the beam attenuation code COLRAD and ADAS atomic rates. Fitting the charge state distribution with a diffusive-convective transport model such as STRAHL or Aurora, insight can be gained about the impurity transport. Both a Levenberg-Marquardt fit as well as a Bayesian nested sampling algorithm are used for this inverse inference.
Current work focuses on the QCE plasmas in our dataset, comparing them to H-mode with type-I ELMs. In particular, discharges with a stepwise transition between both regimes are evaluated.