Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.76: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Investigation of boron transport in the pedestal of ASDEX Upgrade — •Lucas Räß1, Rachael McDermott1,2, Tabea Gleiter1, Dirk Stieglitz1, Thomas Pütterich1,2, Kiera McKay3, Ralph Dux1, Elisabeth Wolfrum1,4, and The ASDEX Upgrade Team5 — 1Max-Planck-Institut für Plasmaphysik — 2Ludwig- Maximilians-Universität München — 3University of Seville — 4TU Wien — 5See author list of H. Zohm et al, 2024 Nucl. Fusion
Impurity transport across the edge of the confined plasma (pedestal) is of special interest for future fusion reactors, as it sets boundary conditions for the core impurity concentration. The transport is generally determined by a combination of collisional (neoclassical) and anomalous contributions, where neoclassical predictions for future reactors result in favourable hollow impurity density profiles.
This study investigates pedestal impurity transport between type-I edge localised modes (ELMs) in the high confinement regime (H-mode) at ASDEX Upgrade across a wide range of plasma parameters. For this purpose, a database of suitable discharges was established and for a subset the ratio of drift velocity to diffusion coefficient is inferred from experimental boron measurements and compared to neoclassical predictions. Our results support prior findings of transport near neoclassical levels in the steep gradient region, with most discharges agreeing well with neoclassical predictions while singular outliers, that occur in particular at low collisionality, are present. Due to uncertainties in these discharges, however, further analysis is needed to prove or disprove significant anomalous transport at low collisionality.
Keywords: Magnetic confinement; Impurity Transport; Neoclassical Transport