SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Poster II
P 12.22: Poster
Mittwoch, 22. März 2023, 17:30–19:00, HSZ EG
Effect of magnetic islands on fast ion confinement in toroidal devices — •David Kulla1, Samuel Lazerson2, Athina Kappatou1, Robert Wolf2, and Hartmut Zohm1 — 1MPI für Plasmaphysik, Garching — 2MPI für Plasmaphysik, Greifswald
Fast ion transport and confinement is an important area of fusion research: the fast ions have to heat the thermal plasma collisionally to reach self-sustaining conditions, and must not be lost e.g. to the vessel wall beforehand. Tokamaks are largely axisymmetric, but suffer from magnetic perturbations which can break this property and lead to increased fast ion transport. Stellarators are intrinsically three-dimensional in their magnetic configuration, but are generally less prone to transient perturbations in their field. In present experiments, one of the main methods of generating fast ions is neutral beam injection (NBI). Magnetic islands arise from helical perturbations of the background magnetic field, either internally from the plasma or externally from magnetic coils.
BEAMS3D is a Monte Carlo code that simulates NBI deposition and collisional slowing down in stellarator and also tokamak plasmas. We present results of verification against NUBEAM as well as validation against experimental data at the ASDEX Upgrade tokamak using fast-ion D-alpha light (FIDA). The results show good agreement between the codes and to experimental data both in on- and off-axis NBI heating phases, demonstrating the capability of BEAMS3D. Additionally, first results comparing simulations and experimental data of plasmas with internal islands are presented.