Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 1: Magnetic Confinment Fusion/HEPP I
P 1.3: Vortrag
Montag, 31. März 2025, 14:40–15:05, ZHG102
Introduction of a 3D global non-linear full-f particle-in-cell model for runaway electrons in JOREK — •Hannes Bergstroem1, Shi-Jie Liu1, Vindoh Bandaru2, and Matthias Hoelzl1 — 1Max Planck Institute for Plasma Physics, Garching b. M. — 2Indian Institute of Technology Guwahati, Assam
Disruptions are a major challenge for ensuring reliable tokamak operation. The acceleration of electrons to relativistic energies, so-called runaway electrons (REs), being a significant concern for future large scale devices like ITER. Accurately predicting the formation and deposition of REs is critical for optimizing machine design and implementing effective disruption mitigation systems. This requires advanced modeling that captures the interplay between REs and the plasma, including the large-scale MHD activity characteristic of disruptions. The non-linear 3D extended MHD code JOREK provides a powerful framework for investigating disruption and RE dynamics. This talk introduces recent enhancements to JOREK, incorporating a hybrid fluid-kinetic model where REs are represented kinetically and coupled to the non-linear MHD equations through a full-f particle-in-cell approach. The model offers precise insight into the phase space distributions, drift dynamics, and transport and losses of REs in stochastic magnetic fields. Benchmarks are conducted for both 2D and 3D configurations, with results showing good agreement with analytical predictions. Additionally, a particularly challenging non-linear case with high relevance for large tokamaks is presented: a benign termination of REs triggered by a rapid burst of MHD activity.
Keywords: runaway electrons; JET; kinetic; MHD; particle-in-cell