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P: Fachverband Plasmaphysik

P 16: Poster Session 3

P 16.2: Poster

Mittwoch, 11. März 2020, 16:30–18:30, Empore Lichthof

Interaction of runaway populations and instabilities — •Andrej Lier¹, Gergely Papp¹, Philipp Lauber¹, Ola Embreus², and George Wilkie³ — ¹Institute for Plasmaphysics, Garching, Germany — ²Chalmers University, Gothemburg, Sweden — ³PPPL, Princeton, NJ, USA

Fusion-born alpha particles in ITER disruption simulations are investigated as a possible drive of Alfvenic instabilities, whose ability to expel runaway electron (RE) seed particles is explored in the pursuit of a passive, inherent RE mitigation system. Utilizing a linearized Fokker-Planck solver, the distribution functions of the highly energetic alpha population during a disruption are computed. A linear gyrokinetic magnetohydrodynamic (MHD) code calculates the Alfven spectrum supported by the plasma which is connected to the previously obtained distribution functions through a self-consistent nonlinear wave-particle interaction tool in order to evaluate the MHD-mode drive. The disruptions themselves are simulated as an exponential temperature drop with iterations taking place over the exponential decay time and final temperature. Focusing on fast thermal quenches and on the spatial density gradient of the suprathermal ion population, we found it capable of exciting weakly damped Alfven Eigenmodes present in the cold post-disruptive plasma in spatial and temporal regimes correlated with runaway electron formation.