First experimental observation of zonal flows in the optimized stellarator Wendelstein 7-X
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866910493145300992 |
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| author | Carralero, D. Estrada, T. García-Regaña, J. M. Sánchez, E. Windisch, T. Alonso, A. Maragkoudakis, E. Brandt, C. Brunner, K. J. Gallego-Castillo, C. Rahbarnia, K. Thienpondt, H. Team, the Wendelstein 7-X |
| author_facet | Carralero, D. Estrada, T. García-Regaña, J. M. Sánchez, E. Windisch, T. Alonso, A. Maragkoudakis, E. Brandt, C. Brunner, K. J. Gallego-Castillo, C. Rahbarnia, K. Thienpondt, H. Team, the Wendelstein 7-X |
| contents | In this work, we present the first experimental evidence of the presence of zonal flow (ZF) structures in the optimized stellarator Wendelstein 7-X. Using an assortment of diagnostics, flux surface-uniform, electrostatic flow oscillations have been measured, showing a radial scale in the range of tens of ion gyroradii. Such measurements show remarkable agreement with the ZF predicted by local and global non-linear gyrokinetic simulations. These results represent the first direct measurement of ZF in a large stellarator, suitable for the validation of models in reactor relevant conditions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_12514 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | First experimental observation of zonal flows in the optimized stellarator Wendelstein 7-X Carralero, D. Estrada, T. García-Regaña, J. M. Sánchez, E. Windisch, T. Alonso, A. Maragkoudakis, E. Brandt, C. Brunner, K. J. Gallego-Castillo, C. Rahbarnia, K. Thienpondt, H. Team, the Wendelstein 7-X Plasma Physics Geophysics In this work, we present the first experimental evidence of the presence of zonal flow (ZF) structures in the optimized stellarator Wendelstein 7-X. Using an assortment of diagnostics, flux surface-uniform, electrostatic flow oscillations have been measured, showing a radial scale in the range of tens of ion gyroradii. Such measurements show remarkable agreement with the ZF predicted by local and global non-linear gyrokinetic simulations. These results represent the first direct measurement of ZF in a large stellarator, suitable for the validation of models in reactor relevant conditions. |
| title | First experimental observation of zonal flows in the optimized stellarator Wendelstein 7-X |
| topic | Plasma Physics Geophysics |
| url | https://arxiv.org/abs/2406.12514 |