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| Autori principali: | , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2512.15588 |
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| author | Estrada, T. Maragkoudakis, E. Carralero, D. Windisch, T. Velasco, J. L Killer, C. Andreeva, T. Geiger, J. Dinklage, A. Krämer-Flecken, A. Wurden, G. A. Beurskens, M. Bozhenkov, S. Damm, H. Fuchert, G. Pasch, E. |
| author_facet | Estrada, T. Maragkoudakis, E. Carralero, D. Windisch, T. Velasco, J. L Killer, C. Andreeva, T. Geiger, J. Dinklage, A. Krämer-Flecken, A. Wurden, G. A. Beurskens, M. Bozhenkov, S. Damm, H. Fuchert, G. Pasch, E. |
| contents | The effect of magnetic islands on plasma flow and turbulence has been experimentally investigated in the stellarator W7-X. Magnetic configurations with the 5/5 magnetic island positioned at the plasma edge, inside the last closed flux surface, are studied. The main diagnostic used in the present work is a V-band Doppler reflectometer that allows the measurement of the perpendicular plasma flow and density fluctuations with good spatial resolution. A characteristic signature of the 5/5 magnetic island is clearly detected in the perpendicular flow profile. The comparison of the experimental flow and the neoclassically driven $E\times B$ flow indicates that the island contribution to the flow is maximum at the island boundaries and close to zero at the island O-point. Besides, a reduction in the density fluctuation level is found nearby the island O-point. The similarities between these observations and those found in other devices and in gyrokinetic simulations are discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_15588 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Impact of magnetic islands on plasma flow and turbulence in W7-X Estrada, T. Maragkoudakis, E. Carralero, D. Windisch, T. Velasco, J. L Killer, C. Andreeva, T. Geiger, J. Dinklage, A. Krämer-Flecken, A. Wurden, G. A. Beurskens, M. Bozhenkov, S. Damm, H. Fuchert, G. Pasch, E. Plasma Physics The effect of magnetic islands on plasma flow and turbulence has been experimentally investigated in the stellarator W7-X. Magnetic configurations with the 5/5 magnetic island positioned at the plasma edge, inside the last closed flux surface, are studied. The main diagnostic used in the present work is a V-band Doppler reflectometer that allows the measurement of the perpendicular plasma flow and density fluctuations with good spatial resolution. A characteristic signature of the 5/5 magnetic island is clearly detected in the perpendicular flow profile. The comparison of the experimental flow and the neoclassically driven $E\times B$ flow indicates that the island contribution to the flow is maximum at the island boundaries and close to zero at the island O-point. Besides, a reduction in the density fluctuation level is found nearby the island O-point. The similarities between these observations and those found in other devices and in gyrokinetic simulations are discussed. |
| title | Impact of magnetic islands on plasma flow and turbulence in W7-X |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2512.15588 |