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P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.48: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Characterisation of the assimilation of shattered pellets injected into a fusion plasma — •Ansh Patel1, G Papp1, A Matsuyama2, S Jachmich3, ASDEX Upgrade Team4, and EUROfusion Tokamak Exploitation Team5 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2Kyoto University, Uji, Kyoto, Japan — 3ITER Organization, St. Paul-lez-Durance, France — 4See the author list of H. Zohm et al, Nucl. Fusion 2024 — 5See the author list of E. Joffrin et al, Nucl. Fusion 2024
A disruption mitigation system (DMS) is necessary for reactor-relevant tokamaks like ITER to ensure the preservation of machine components throughout their designated operational lifespan. To address the intense heat and electromagnetic loads during a disruption, a shattered pellet injection (SPI) system will be employed. The SPI system involves injecting material into the plasma in the form of a cryogenic pellet that is shattered on a bent tube before entering the plasma. The penetration and assimilation of the injected material is influenced by various SPI parameters, including the fragment sizes, speeds, composition and the injection scheme. In this contribution, the material assimilation during SPI in the ASDEX Upgrade tokamak is characterized. The influence of different SPI parameters and different injection schemes on assimilation is carried out to determine optimal parameters for mitigation. The spatial distribution of material ablation and assimilation was carried out. Experimental analysis is also complemented with modelling with the 1.5D INDEX code to understand the plasma dynamics and its dependence on the aforementioned SPI parameters.
Keywords: Disruptions; Disruption mitigation; Shattered pellet injection; Assimilation