Erlangen 2026 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.90: Poster

Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal

hybrid kinetic-MHD simulations of energy-dependent effects of runaway electron beams on MHD Instabilities — •Shijie Liu, Hannes Bergstroem, Haowei Zhang, and Matthias Hoelzl — Max Planck Institute for Plasma Physics,Garching b.m., Germany

Runaway electrons (REs) are of particularly importance to the safe operation of tokamaks. Electrons may be accelerated by the large toroidal electric field arising during a major disruption. Without adequate mitigation measures, these energetic electrons may eventually hit the first wall of the device focusing on an extremely localized area, which poses a serious threat to the safe operation of the device. To predict the runaway dynamics during a disruption and develop mitigation strategies, the mutual interaction between REs and the bulk plasma should be carefully considered.

In a cold plasma with a high-energetic runaway beam, the equilibrium cannot be force-free, and the RE curvature drift introduces an energy-dependent outward shift of magnetic flux surfaces. We investigate how these RE-induced orbit shifts affect both linear and nonlinear MHD instabilities, with a particular focus on tearing modes. A poloidal mode coupling mechanism is now observed due to (1,0) component of the RE curvature drift. Future work will extend efforts by comparing the resistive layer width with the characteristic width of RE orbits.

Keywords: magnetohydrodynamics; runaway electrons; hybrid simulation