Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 11: Helmholtz Graduate School - Poster
P 11.9: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
Characterisation of the Wendelstein 7-X divertor plasma with Langmuir probes — •Lukas Rudischhauser1, Kenneth Charles Hammond1, Michael Endler1, Boyd Douglas Blackwell2, and the W-7X Team1 — 1Max-Planck-Insitute for Plasma Physics, Greifswald, Germany — 2Australian National University, Canberra, Australia
During the operation phase 1.2a of the stellarator Wendelstein 7-X, 40 Langmuir probes embedded in the newly installed divertor were used to investigate the scrape-off layer. Temperatures, densities and plasma potentials were measured over a range of distances from the pumping gap, sampling different topological regions of the magnetic island divertor field.
Capabilities and limitations of the diagnostic are briefly introduced. The data are combined with observations of optical and spectrographic diagnostics as well as upstream probes to characterise the behaviour of the divertor plasma with respect to global plasma parameters. We present results of experiments on impurity seeding, pellet fuelling, radiative edge cooling and discuss indications for detachment in detail.