Abstract
The pellet fuelling potential was studied at Wendelstein 7-X (W7-X) stellarator in the OP1.2b campaign. Unusual observation was made by the PCI diagnostics[1], showing sudden drop of fluctuation level in the core after pellet fuelling. The decreased fluctuation level was accompanied by improved energy confinement. In this paper the edge behaviour was studied in details in this period. The decreased turbulence level was clearly observed in the edge region with the Alkali Beam Emission Spectroscopy (ABES) diagnostic. The spatio-temporal structure of fluctuations were calculated using correlation functions in various periods of the discharge. Multiple diagnostics were used to complete and confirm the results from the analysis of the ABES diagnostic. The time evolution of fluctuation behaviour was characterized by calculating cross-correlations of ABES signals with Phase Contrast Imaging (PCI), H-alpha, Mirnov coil diagnostics signals.
| Original language | English |
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| Title of host publication | 47th EPS Conference on Plasma Physics, EPS 2021 |
| Publisher | European Physical Society (EPS) |
| Pages | 956-959 |
| Number of pages | 4 |
| ISBN (Electronic) | 9781713837046 |
| State | Published - 2021 |
| Event | 47th EPS Conference on Plasma Physics, EPS 2021 - Sitges, Spain Duration: Jun 21 2021 → Jun 25 2021 |
Publication series
| Name | 47th EPS Conference on Plasma Physics, EPS 2021 |
|---|---|
| Volume | 2021-June |
Conference
| Conference | 47th EPS Conference on Plasma Physics, EPS 2021 |
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| Country/Territory | Spain |
| City | Sitges |
| Period | 06/21/21 → 06/25/21 |
Funding
Acknowledgments: This work was carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.