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P: Fachverband Plasmaphysik
P 19: Poster II
P 19.21: Poster
Donnerstag, 31. März 2022, 16:00–17:30, P
Towards Simulations of Deuterium Shattered Pellet injection into an MHD active ITER plasma — •Fabian Wieschollek1, Matthias Hoelzl1, Eric Nardon2, and The JOREK Team3 — 1Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching b. M., Germany — 2CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France — 3See the author list of M. Hoelzl et al 2021 NF 61, 065001
The foreseen disruption mitigation strategy for ITER is shattered pellet injection (SPI). In a realistic disruption scenario, the SPI is being triggered, when the plasma has already become MHD active; in particular 2/1 neoclassical tearing modes (NTM) are often present.
Previous theoretical studies on an ASDEX Upgrade equilibrium have shown, that a large pre-existing NTM may influence the thermal quench (TQ) significantly. According to these studies, the injection into the O-point delays TQ, while it occurs considerably earlier with X-point injection. Results indicate that pre-existing islands do not render the mitigation ineffective.
To further verify these findings, the studies are now being extended to an ITER L-mode plasma, into which Deuterium SPI is launched. Scans will be performed of the initial island width, the number of atoms injected, and the relative injection phase with respect to the island O-point and the concentration of background impurities. Also, different shard velocitiy distributions are considered. We are presenting here the detailed research plans, as well as the first preliminary results.