Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 25: Poster III
P 25.31: Poster
Thursday, February 29, 2024, 16:30–18:30, ELP 6: Foyer
Modelling ion orbits in the W7-X neutral beam box — •Lucas van Ham1, Samuel Lazerson1, Björn Hamstra2, Paul McNeely1, Norbert Rust1, and Dirk Hartmann1 — 1Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany — 2Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands
Neutral beam injection (NBI) on Wendelstein 7-X (W7-X) is limited in duration by the heat loads experienced by the NBI components. Deposition patterns on these components have been observed to shift upwards when the main magnetic field of W7-X is on, suggesting stray magnetic fields are penetrating the neutral beam box. We aim to investigate the cause of this shift and how to mitigate this issue. In this work, ion orbits inside the W7-X NBI box will be investigated using the Monte Carlo particle following code BEAMS3D. Simulations will be performed to estimate calorimeter heat loads which will be compared against experimental results. Next, the bending magnet will be included in simulations and a similar investigation will be carried out for the H+ and H2+ ion dumps. Future simulations will focus on including the effect of the magnetization of the magnetic material inside the NBI box on the orbits of the ions.
Keywords: W7-X; neutral beam; energetic particles; fusion