SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 11: Poster I
P 11.40: Poster
Mittwoch, 22. März 2023, 14:00–15:30, HSZ EG
Modeling of runaway electrons in disruption mitigation scenarios with DREAM — •Peter Halldestam1, Gergely Papp1, Hannes Bergström1, Mathias Hoppe2, Oskar Vallhagen3, István Pusztai3, and Tünde Fülöp3 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2Swiss Plasma Center, Lausanne, Switzerland — 3Department of Physics, Chalmers University of Technology, Göteborg, Sweden
One of the main issues threatening the success of future reactor-scale tokamaks is disruptions. It is the sudden loss of confinement where the plasma rapidly dissipates its energy onto the surrounding structures, exposing the device to excessive mechanical stress and heat loads. In addition, an electric field is induced that can accelerate a significant fraction of the electrons to relativistic energies, giving rise to runaway electrons (REs). Unmitigated disruptions could potentially cause severe damage to the device and, thus, modeling such events is crucial for being able to assess the effectiveness of various mitigation techniques.
Using the numerical RE modeling framework DREAM [Hoppe CPC 2021], we study the effects massive material injection (MMI) of deuterium and neon has on disrupting plasma representative of ITER, particularly the RE generation and the dissipation of its energy content. We self-consistently evolve the electric field, ion charge state densities, thermal electron temperature and density as well as the RE density in a flux surface-averaged fluid description of the plasma. This model is used together with a Bayesian optimisation tool to find suitable MMI parameters that minimise potential damage to the device.