Erlangen 2026 – scientific programme
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.78: Poster
Thursday, March 19, 2026, 13:45–15:45, Redoutensaal
Modelling the Pellet-Produced Plasmoid Dynamics in Stellarators with JOREK — •Carl Wilhelm Rogge1, Ksenia Aleynikova1, Pavel Aleynikov1, Rohan Ramasamy2, Matthias Hoelzl1, and Nikita Nikulsin1 — 1Max-Planck-Institut für Plasmaphysik, Greifswald and Garching — 2Proxima Fusion, München
Cryogenic pellet injection is expected to be a key technique for refuelling future fusion reactors based on the stellarator concept. While this technique is more mature in tokamak experiments, the departure from axisymmetry in stellarators introduces unique challenges and opportunities that remain insufficiently explored.
Here, we employ the stellarator extension of the 3D nonlinear MHD code JOREK to study the radial drift of a fully ionised plasmoid. Since this drift depends on the pressure evolution within the pellet-produced plasmoid, the parallel expansion has a strong impact on the final deposition profile of the injected material. Consequently, particular attention must be paid to accurately modelling the reheating of the plasmoid by hot background plasma particles, which drives the parallel expansion. Because the mean free path of background electrons in core-fuelling scenarios is very long, non-local heat transport effects need to be incorporated into the fluid description.
Two non-local heating schemes have been newly implemented in JOREK and verified against analytical theory. These new schemes are then applied to stellarator geometries, where the radial drift following complete pellet ionisation is investigated.
Keywords: Pellet injection; Reduced MHD; Stellarator; JOREK non-linear 3D MHD code