Greifswald 2024 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
P: Fachverband Plasmaphysik
P 12: Poster II
P 12.13: Poster
Tuesday, February 27, 2024, 16:30–18:30, ELP 6: Foyer
Modelling of shattered pellet injection in ASDEX Upgrade — •Peter Halldestam1, Paul Heinrich1, Gergely Papp1, Mathias Hoppe2, Oskar Vallhagen3, Matthias Hoelzl1, and Frank Jenko1 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2Royal Institute of Technology, Stockholm, Sweden — 3Chalmers 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.
With the modeling framework DREAM [Hoppe CPC 2021], we self- consistently evolve in time the poloidal flux and parallel current density, ion charge state densities and temperatures, thermal electron temperature (their density follows from quasi-neutrality) as well as the RE density -- all in a flux surface-averaged fluid description of the plasma. In this contribution we study the effects shattered pellet injection (SPI) of deuterium and neon has on disrupting plasmas for ASDEX Upgrade. Initial simulations show good agreement with experimentally observed current quench rates and radiated energy fractions.
Keywords: tokamak disruption modelling; shattered pellet injection; ASDEX Upgrade