On How Zonal Fields Suppress Reversed Shear Alfvén Eigenmode in Tokamak Plasmas
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
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| _version_ | 1866908703532253184 |
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| author | Ma, Ruirui Liu, Pengfei Chen, Liu Zonca, Fulvio Qiu, Zhiyong |
| author_facet | Ma, Ruirui Liu, Pengfei Chen, Liu Zonca, Fulvio Qiu, Zhiyong |
| contents | Employing both nonlinear gyrokinetic simulations and theoretical analyses, we have discovered the novel result that, with energetic particle dynamics kept linear, the nonlinear suppression and eventual saturation of reversed-shear Alfvén eigenmode occur via the downward frequency chirping induced by the beat-driven zonal current. More specifically, as the mode frequency chirps downward, there is enhanced mode conversion to radially propagating electron Landau-damped kinetic Alfvén waves; resulting in enhanced convective (radiative) damping and, thereby, its suppression and saturation. Theoretical results are in good agreement with simulations both qualitatively and quantitatively. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_09243 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On How Zonal Fields Suppress Reversed Shear Alfvén Eigenmode in Tokamak Plasmas Ma, Ruirui Liu, Pengfei Chen, Liu Zonca, Fulvio Qiu, Zhiyong Plasma Physics Employing both nonlinear gyrokinetic simulations and theoretical analyses, we have discovered the novel result that, with energetic particle dynamics kept linear, the nonlinear suppression and eventual saturation of reversed-shear Alfvén eigenmode occur via the downward frequency chirping induced by the beat-driven zonal current. More specifically, as the mode frequency chirps downward, there is enhanced mode conversion to radially propagating electron Landau-damped kinetic Alfvén waves; resulting in enhanced convective (radiative) damping and, thereby, its suppression and saturation. Theoretical results are in good agreement with simulations both qualitatively and quantitatively. |
| title | On How Zonal Fields Suppress Reversed Shear Alfvén Eigenmode in Tokamak Plasmas |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2512.09243 |