Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 25: Poster III
P 25.26: Poster
Thursday, February 29, 2024, 16:30–18:30, ELP 6: Foyer
Hybrid kinetic-MHD simulations of runaway electron beam termination events in realistic 3D tokamak geometry — •Hannes Bergstroem1, Matthias Hoelzl1, and Vinodh Bandaru2 — 1Max Planck Institute for Plasma Physics, Garching b. M. — 2Indian Institute of Technology Guwahati, Assam
Disruption events and the associated generation of highly energetic runaway electrons (REs) remain one of the largest threats to future high current tokamak reactor designs like ITER and DEMO. Studies have indicated that even with systems in place to mitigate these events, a multi-MA RE beam may be unavoidable during the nuclear phase of ITER operation. The transport of REs in 3D MHD fields is however difficult to model and presents one of the largest uncertainties for these estimates, since it can have a substantial impact on the beam formation and the details of the ensuing termination. This is particularly challenging since REs carry most of the current at these stages and therefore dominate the dynamics of the plasma, rendering test particle approaches insufficient.
In this work we present a newly implemented hybrid kinetic-MHD model in JOREK, where the kinetic RE population is coupled to the MHD equations in realistic 3D tokamak geometry using a particle-in-cell approach. At first, results from analytical validation with respect to the force balance in a plasma with high RE current are shown. In addition we present results from a RE beam termination scenario in JET, as it occurs due to a burst of 3D MHD activity.
Keywords: Runaway electrons; Disruption; MHD; Particle-in-cell; JET