Bulletin of the American Physical Society
65th Annual Meeting of the APS Division of Plasma Physics
Monday–Friday, October 30–November 3 2023; Denver, Colorado
Session GP11: Poster Session III:
LTP: Measurement, analysis and control of low temperature plasmas
Fundamental: Waves, instabilities, and turbulence
MFE: Stellarators: W7-X, LHD, HSX, CTH, Others; Divertor physics
9:30 AM - 12:30 PM
Tuesday, October 31, 2023
Room: Plaza ABC
Abstract: GP11.00075 : Direct fast-ion density measurements with FIDA spectroscopy in Wendelstein 7-X*
Presenter:
Peter Z Poloskei
(Max-Planck-Institut für Plasmaphysik)
Authors:
Peter Z Poloskei
(Max-Planck-Institut für Plasmaphysik)
Oliver P Ford
(Max-Planck-Institut für Plasmaphysik)
Thilo Romba
(Max-Planck-Institut für Plasmaphysik)
Benedikt Geiger
(University of Wisconsin - Madison)
Samuel A Lazerson
(Max-Planck-Institut für Plasmaphysik)
Robert C Wolf
(Max-Planck-Institut für Plasmaphysik)
Collaboration:
W7-X Team
Through the investigation of the interaction between recycling neutrals and fast-ions, we identified and characterized edge-localized prompt losses, which were subsequently quantified using forward modeling techniques. Our findings revealed that a significant proportion, up to 10% of the injected power, could be lost in the edge region of the plasma.
Additionally, dedicated discharges involving NBI modulation allowed us to isolate active FIDA signals for the first time, which enabled the reconstruction of the density of confined fast-ions, providing valuable insight into their behavior. Moreover, the obtained data will serve as a crucial validation resource in the future for fast-ion slowing down codes.
*This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them.
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