Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 11: Helmholtz Graduate School - Poster
P 11.25: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
First results of the Coherence Imaging Spectroscopy Systems on Wendelstein 7-X — •Valeria Perseo1, Ralf Koenig1, Oliver Ford1, Dorothea Gradic1, Florian Effenberg2, Christoph Biedermann1, Gabor Kocsis3, Thomas Sunn Pedersen1, and W7-X Team1 — 1Max Planck Institute for Plasma Physics, Greifswald, Germany — 2University of Wisconsin, Madison, USA — 3Wigner RCP, Budapest, Hungary
The Coherence Imaging Spectroscopy (CIS) system is a camera based interferometer able to measure 2D impurity flow velocities for a selected visible line from the plasma. A modulation pattern encoding the spectral line properties is generated by the usage of birefringent crystals. The CIS system 2D measuring capability and high optical throughput made the diagnostic attractive for the complex magnetic island topology of Wendelstein 7-X (W7-X). Two CIS systems have been designed and set up to face the challenging experimental conditions of W7-X. Their views is on the same island divertor, which is observed with nearly perpendicular lines of sight for an easier emission and flow interpretation in the W7-X geometry. First measurements have been performed during the second part of the last experimental campaign OP1.2a, observing the plasma at different magnetic configurations, densities and heating powers. The behavior of multiple impurities, mainly carbon and helium, have been studied. The diagnostic output will be compared with dedicated EMC3-EIRENE simulations.