Study of the impact of fast ions on core turbulence at rational surfaces via global gyrokinetic simulations
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866918257658691584 |
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| author | Brioschi, D. Di Siena, A. Bilato, R. Bottino, A. Hayward-Schneider, T. Mishchenko, A. Poli, E. Zocco, A. Jenko, F. |
| author_facet | Brioschi, D. Di Siena, A. Bilato, R. Bottino, A. Hayward-Schneider, T. Mishchenko, A. Poli, E. Zocco, A. Jenko, F. |
| contents | In this work, the interplay between fast ions and safety factor rational surfaces is studied in a turbulent plasma via global nonlinear gyrokinetic simulations. Initially, the fast particles-induced enhancement of shearing structures from turbulence self-interaction is analyzed. Our study takes into account the competition between this mechanism and other fast ions effects, i.e. thermal profiles dilution and quasi-resonant interaction. We find the fast ions-induced reduction of destabilization threshold for the zonal modes to be a very efficient way to suppress turbulence. Indeed, it leads to the formation of regions where turbulent transport is reduced by 90\% of its original value. Furthermore, an $n=m=1$ fishbone is driven unstable inside the plasma and its interaction with turbulence is studied. We find the beat-driven zonal structure generate by this mode to further reduce turbulence when its presence does not drastically flatten the thermal profiles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_18639 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Study of the impact of fast ions on core turbulence at rational surfaces via global gyrokinetic simulations Brioschi, D. Di Siena, A. Bilato, R. Bottino, A. Hayward-Schneider, T. Mishchenko, A. Poli, E. Zocco, A. Jenko, F. Plasma Physics In this work, the interplay between fast ions and safety factor rational surfaces is studied in a turbulent plasma via global nonlinear gyrokinetic simulations. Initially, the fast particles-induced enhancement of shearing structures from turbulence self-interaction is analyzed. Our study takes into account the competition between this mechanism and other fast ions effects, i.e. thermal profiles dilution and quasi-resonant interaction. We find the fast ions-induced reduction of destabilization threshold for the zonal modes to be a very efficient way to suppress turbulence. Indeed, it leads to the formation of regions where turbulent transport is reduced by 90\% of its original value. Furthermore, an $n=m=1$ fishbone is driven unstable inside the plasma and its interaction with turbulence is studied. We find the beat-driven zonal structure generate by this mode to further reduce turbulence when its presence does not drastically flatten the thermal profiles. |
| title | Study of the impact of fast ions on core turbulence at rational surfaces via global gyrokinetic simulations |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2512.18639 |