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P: Fachverband Plasmaphysik

P 9: Poster I

P 9.18: Poster

Dienstag, 29. März 2022, 16:00–17:30, P

Analysis and modeling of momentum transport based on NBI modulation experiments at ASDEX Upgrade — •Carl Friedrich Benedikt Zimmermann^1,2, Rachael McDermott¹, Emiliano Fable¹, Basil Duval⁴, Ralph Dux¹, Antti Salmi³, Ulrich Stroth^1,2, Tuomas Tala³, and Giovanni Tardini¹ — ¹Max Planck Institute for Plasma Physics, 85748 Garching, Germany — ²Physik-Department E28, Technische Universität München, 85747 Garching, Germany — ³VTT, P.O. Box 1000, FI-02044 VTT, Finland — ⁴EPFL, Swiss Plasma Center, CH-1015 Lausanne, Switzerland

Understanding momentum transport is crucial in reliably predicting the plasma rotation profiles of future fusion devices. At ASDEX Upgrade, momentum transport is studied to validate theoretical models and transport codes. The new momentum transport analysis framework uses neutral beam modulation experiments to determine the con tributions of diffusion, convection, and residual stress to momentum transport within the core plasma. The methodology was applied to a database of more than 90 phases from 50 varied discharges. A recent experimental campaign filled gaps in this database enlarging the probed parameter space to study the effect of the turbulence transition from trapped electron to ion-termperature-gradient modes on momentum transport. Such a large data set makes it possible to study the parameter dependencies of the transport coefficients. In ongoing experiments, the parameter space of the database will be further enlarged allowing more detailed validation of the methodology and theoretical predictions.