Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Magnetic Confinement - Poster
P 12.14: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
Search for signatures of non-local electron heat transport in fusion plasmas — •Klara Höfler1,2, Tim Happel1, Pascale Hennequin3, François Ryter1, Ulrich Stroth1,2, Udo Höfel4, the ASDEX Upgrade Team1, and the W7-X Team4 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2Physics Department E28, Technical University Munich, Garching, Germany — 3Laboratoire de Physique des Plasma, Ecole Polytechnique, Palaiseau, France — 4Max Planck Institute for Plasma Physics, Greifswald, Germany
Heat transport in fusion plasmas is in general described by Fick's law which predicts a direct dependence of energy fluxes on the local gradients in plasma temperature and plasma density. Fick's law has been experimentally confirmed, however, past and current fusion devices reported experiments where under certain conditions in transient state the local heat flux is no longer a function of the local parameters only. This talk presents the search for this kind of violations on the ASDEX Upgrade tokamak and the W7-X stellarator. Transient states in electron heat flux are generated by strong and fast changes of the electron microwave heating, both with sudden power steps after stationary state as well as fast power modulation. The spatially and temporally resolved heat flux is taken from subtracting the radiated and the absorbed power from the heating power. Conclusions about non-locality are drawn from relating the heat flux to the local temperature gradient and from simulations with the transport code ASTRA which connect power steps and modulation experiments.