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P: Fachverband Plasmaphysik

P 11: Magnetic Confinement IV

P 11.5: Talk

Wednesday, March 18, 2026, 15:35–15:50, KH 02.016

Transport investigations in pellet-fuelled plasmas of ASDEX Upgrade — •Florian Gschoesser, Clemente Angioni, Michael Bergmann, Emiliano Fable, Rainer Fischer, Peter Lang, Bernhard Ploeckl, Federico Stefanelli, Dirk Stieglitz, Giovanni Tardini, Hartmut Zohm, and ASDEX Upgrade Team — Max Planck Institute for Plasma Physics, Garching, Germany

Pellets are, for all practical purposes, the only way to fuel plasmas in a future fusion reactor. The injection of such a pellet, formed from cryogenic solid hydrogen, introduces large modifications to the plasma parameters, especially in density and temperature. The resulting momentary transition of the plasma into a non-stationary state leads to transport processes that will be investigated. This talk will focus mainly on two aspects: on one hand, it will address the experimental efforts to achieve reliable and robust profile measurements during a pellet injection; on the other hand, it will present an approach to derive information regarding the transport processes by comparing experimental observations (Thomson scattering, DCN interferometer, IDA) and simulation results (ASTRA). Progressing from lower to higher complexity, the following cases will be discussed: First, "single" repetitive pellet perturbations are analyzed. The second case deals with a high-density quasi-stationary phase, where strong fueling is applied. Finally, the transition from low to high density via a sudden injection of pellets at high frequency is discussed. Some first simulation results and conclusions will be presented.

Keywords: ASDEX Upgrade; Pellet; ASTRA; Transport; Confinement