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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.65: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Density dynamics of shattered pellet injection using a dispersion interferometer — •Andrew Moreau1,2, Alexander Bock1, Stefan Jachmich3, Umar Sheikh4, Gergely Papp1, Anshkumar Patel1, and Thomas Pütterich1, 2 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2Ludwig Maximilian University, Munich, Germany — 3ITER Organization, St Paul Lez Durance Cedex, France — 4Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
High-current tokamaks contain a severe risk from unmitigated disruptions. Loss of plasma confinement in these scenarios could lead to excessive heat and force loads on a reactor and create runaway electron beams capable of causing intense localized damage inside the device. Shattered pellet injection is a promising candidate for disruption mitigation, controlling the thermal and current quenches during an unavoidable disruption.
The core density evolution following injected hydrogenic and neon-doped hydrogenic fragments is a key indicator of the disruption mitigation effectiveness. At ASDEX Upgrade, the line-integrated electron density through the core is evaluated using a dispersion interferometer. Results from the 2025 campaign show how a small quantity of neon doping (∼ 0.1 %) in a deuterium shattered pellet injection can result in significantly higher density retention (∼ 4 · 1020 m−2) at much later phases in the current quench. Furthermore, the multiple pellet injection schemes have been shown to achieve high densities while lengthening the duration of the pre-thermal quench.
Keywords: tokamak; density; disruptions; diagnostics