Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 17: Magnetic Confinement V/HEPP VI
P 17.2: Talk
Wednesday, February 28, 2024, 17:00–17:15, ELP 6: HS 3
Effect of magnetic islands on fast ion confinement in toroidal devices — •David Kulla1,2, Samuel Lazerson2, Athina Kappatou1, Robert Wolf2, and Hartmut Zohm1 — 1MPI für Plasmaphysik, Garching — 2MPI für Plasmaphysik, Greifswald
We present applied modeling work with the newly validated BEAMS3D code for simulating neutral beam deposition and fast ion slowing down in tokamaks and stellarators. Fast alpha particles generated by fusion reactions have to heat the thermal plasma collisionally to reach self-sustaining conditions in a reactor and therefore be well confined in the magnetic field. Tokamaks are largely axisymmetric, but suffer from dynamic magnetic perturbations which can break this property and lead to increased fast ion transport and losses. Stellarators are intrinsically three-dimensional but are generally less prone to transient perturbations. In present experiments, neutral beam injection can be used to generate and study fast ions. Magnetic islands arise from helical perturbations of the background magnetic field, either internally from the plasma or externally from magnetic coils.
BEAMS3D has recently been verified against NUBEAM as well as validated against experimental data at the ASDEX Upgrade tokamak using fast-ion D-alpha light (FIDA). We present simulations studying the effect of internal magnetic islands in ASDEX-Upgrade (tokamak) and Wendelstein 7-X (stellarator), showing similarities and differences. The simulations are compared to experimental measurements where applicable.
Keywords: stellarator; tokamak; fast ions; validation; fida