SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 2: Magnetic Confinement I/HEPP I
P 2.2: Vortrag
Montag, 20. März 2023, 11:30–11:55, CHE/0091
Experimental and numerical investigation of helium exhaust at the ASDEX Upgrade tokamak with full-tungsten wall — •Antonello Zito1,2, Marco Wischmeier1, Athina Kappatou1, Arne Kallenbach1, Francesco Sciortino1, Volker Rohde1, Klaus Schmid1, Edward Hinson3, Oliver Schmitz3, Marco Cavedon4, Rachael McDermott1, Ralph Dux1, Michael Griener1, and Ulrich Stroth1,2 — 1Max-Planck-Institut für Plasmaphysik — 2Physik-Department E28, Technische Universität München — 3University of Wisconsin-Madison — 4Dipartimento di Fisica "G. Occhialini", Università di Milano-Bicocca
An efficient removal of helium ash by active pumping in future fusion devices is necessary to avoid fuel dilution and not degrade plasma confinement. Therefore, a deep understanding of the underlying physics mechanisms is mandatory. Helium recycling and pumping has been experimentally investigated at the ASDEX Upgrade tokamak. The time evolution of helium following a small injection during otherwise steady-state deuterium discharges was measured spectroscopically both in the core plasma and in the neutral exhaust gas. The exhaust efficiency was found to improve with increasing divertor neutral pressures, but to degrade with detachment. A multi-reservoir particle balance model was developed to interpret the observed exhaust dynamics. The limited performance of the pumping system and an efficient helium storage capability of the tungsten wall were identified to have a strong impact on the exhaust dynamics. The SOLPS-ITER code was used to interpret the observed He transport towards the divertor.