Göttingen 2025 – scientific programme
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P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.4: Poster
Wednesday, April 2, 2025, 16:15–18:15, ZHG Foyer 1. OG
Towards Modeling Pellet-Produced Plasmoid Dynamics in Stellarators with JOREK — •Carl Wilhelm Rogge1, Ksenia Aleynikova1, Pavel Aleynikov1, Rohan Ramasamy2, Matthias Hoelzl2, and Nikita Nikulsin3 — 1Max-Planck-Institut, 17491 Greifswald, Germany — 2Max-Planck-Institut, 85748 Garching, Germany — 3Dept. of Astrophysical Sciences, Princeton University
Pellet injection will be vital for refueling future tokamak and stellarator reactors. While pellet plasmoid physics has been extensively studied in tokamak magnetic geometries, understanding it in stellarator geometries remains less comprehensive. In particular, the non-axisymmetry of the equilibrium field in stellarators increases the complexity of numerical analysis.
However, recent advancements in the stellarator extension [Nikulsin 2022] of the JOREK non-linear 3D MHD code, which employs a reduced MHD model for stellarator geometry, show significant promise in addressing this challenge. Consequently, this project aims to leverage JOREK to deepen the understanding of pellet plasmoid dynamics, with a particular focus on perpendicular drifts in stellarators.
We benchmark computed plasmoid dynamics with the expected analytical solutions [Aleynikov 2019, 2024]. A good agreement is demonstrated when the plasmoid expands predominately along the field line using an appropriate heating model. Different heating models for the pellet-plasmoid are implemented in JOREK and compared.
Keywords: Pellet injection; Reduced MHD; Stellarator; JOREK non-linear 3D MHD code