Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.38: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Hybrid kinetic-MHD simulations of interactions between tearing modes and runaway electrons in JOREK — •Shijie Liu1, Hannes Bergstroem1, Tong Liu2, Haowei Zhang1, and Matthias Hoelzl1 — 1Max Planck Institute for Plasma Physics, Garching b. M., Germany — 2Dalian University of Technology, Dalian, China
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 this work, we focus on developing a self-consistent coupling of the full-f relativistic PIC model for REs to the background plasmas with a guiding center treatment, using the nonlinear extended MHD code JOREK. The accurate representation of the radial force balance of a circular axisymmetric RE beam is verified by comparing to analytical results. Moreover, a comparison to the 3D tearing modes linear theory is done for the MHD simulation with REs. Finally, non-linear results are presented for tearing modes in the presence of runaway electrons with different Δ′.
Keywords: magnetohydrodynamics tearing modes; hybrid simulation; runaway electrons; tearing modes