Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.2: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Impact of RMPs on plasma rotation in ASDEX Upgrade — •Margherita Salerno1, Matthias WIllensdorfer1, Rachael McDermott1, Tuomas Tala2, Athina Kappatou1, and Tabea Gleiter1 — 1Max Planck Institute for Plasma Physics, 85748 Garching, Germany — 2VTT Technical Research Centre of Finland
Tokamaks, though designed for perfect axi-symmetry, experience unavoidable symmetry breaking from sources like toroidal field coil ripples, error fields, and resonant magnetic perturbation (RMP) coils used for ELM suppression. These non-axisymmetric perturbations are important as they drive non-ambipolar radial particle fluxes, resulting in the Neoclassical Toroidal Viscous (NTV) torque. This torque typically acts on the plasma by spinning-up or breaking the rotation, depending on the contributions from electrons and ions. For future devices like ITER, it is crucial to quantify the NTV torque as, in this device, it may be comparable to other applied and intrinsic torques and thus make a more important contribution to the momentum balance than typically observed in present-day beam-heated devices. This work will study the impact of RMPs on plasma rotation in ASDEX Upgrade. Our investigation will focus on i) radial distribution of the torque source via coil current modulations, ii) impact of the poloidal spectrum of the RMP coils on the torque and iii) impact of the ExB rotation frequency of the torque. The experimental results will be analyzed with GPEC, which is a linear code that works generalizing the perturbed equilibrium, and then benchmarked with other codes, like MARS-K and NEO-2.
Keywords: resonant magnetic perturbations; neoclassical toroidal viscous torque; coil current modulations; plasma rotation; GPEC