Hannover 2020 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 15: Helmholtz Graduate School 3 and Magnetic confinement 3
P 15.5: Vortrag
Mittwoch, 11. März 2020, 15:35–15:50, b305
Spectroscopic characterization of the boronization impact on the impurity sources in Wendelstein 7-X — •Stepan Sereda1, Sebastijan Brezinsek1, Erhui Wang1, Tullio Barbui2, Rudolf Brakel3, Birger Buttenschön3, Peter Drewelow3, Andrei Goriaev4, Ralf König3, Maciej Krychowiak3, Yunfeng Liang1, Dirk Naujoks3, Andrea Pavone3, Marcin Rasinski1, Lukas Rudischhauser3, Holger Viebke3, Tom Wauters4, Victoria Winters3, and the W7-X team3 — 1Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Jülich, Germany — 2Princeton Plasma Physics Laboratory, Princeton, NJ 08540, United States of America — 3Max-Planck-Institut für Plasmaphysik, Greifswald, Germany — 4Laboratory for Plasma Physics, LPP-ERM/KMS, B-1000 Brussels, Belgium, Trilateral Euregio Cluster (TEC) Partner
In the last experimental campaign of Wendelstein 7-X the passively cooled test divertor unit made of carbon and the stainless steel wall were the main sources of low-Z impurities oxygen and carbon. To tackle this problem three boronizations were performed which significantly decreased the impurity levels (more than factor of 10 for oxygen and 4 for carbon). These changes are characterized by the emission spectroscopy focused at the impurity sources. The ion flux change for the second and the third boronizations is deduced from the divertor Langmuir probes data. The change of hydrogen recycling after the boronization is studied employing filter cameras for hydrogen line radiation observing the complete divertor module.