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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2512.22611 |
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| _version_ | 1866917172237828096 |
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| author | Li, Jingchun Lu, Zhaoyang Xu, Jianqiang Chen, Wei Dong, Jiaqi Luo, Jingting Liu, Yong |
| author_facet | Li, Jingchun Lu, Zhaoyang Xu, Jianqiang Chen, Wei Dong, Jiaqi Luo, Jingting Liu, Yong |
| contents | The fast-ion (FI) on turbulent transport is one of the key topics of magnetic confinement fusion. This work focus on the impact of FI pressure gradients on turbulence in a high-\b{eta} plasma scenario using gyrokinetic simulations. Linear analyses reveal that FIs strongly stabilize ion temperature gradient (ITG) modes via the thermal-ion dilution, while their influence on trapped electron modes (TEMs) is minimal. At elevated FI pressure gradients, a transition to a FI-driven BAE (FI-BAE) regime occurs, as evidenced by mode structure and frequency alignment within the Alfvénic gap. Electron \b{eta} scans further demonstrate the emergence of kinetic ballooning modes (KBMs) at higher \b{eta}, whereas an ITG-TEM hybrid turbulence dominates near experimental \b{eta} values. Nonlinear simulations show that moderate FI pressure suppresses transport via zonal flow (ZF) shear, whereas strong FI drive weakens ZFs and enhances transport by destabilizing FI-BAEs. These results highlight the dual role of FIs in regulating turbulence and offer insight into multiscale transport physics relevant for high-performance plasmas. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_22611 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Impact of fast ions on turbulent transport in high-\b{eta} HL-2A scenarios Li, Jingchun Lu, Zhaoyang Xu, Jianqiang Chen, Wei Dong, Jiaqi Luo, Jingting Liu, Yong Plasma Physics The fast-ion (FI) on turbulent transport is one of the key topics of magnetic confinement fusion. This work focus on the impact of FI pressure gradients on turbulence in a high-\b{eta} plasma scenario using gyrokinetic simulations. Linear analyses reveal that FIs strongly stabilize ion temperature gradient (ITG) modes via the thermal-ion dilution, while their influence on trapped electron modes (TEMs) is minimal. At elevated FI pressure gradients, a transition to a FI-driven BAE (FI-BAE) regime occurs, as evidenced by mode structure and frequency alignment within the Alfvénic gap. Electron \b{eta} scans further demonstrate the emergence of kinetic ballooning modes (KBMs) at higher \b{eta}, whereas an ITG-TEM hybrid turbulence dominates near experimental \b{eta} values. Nonlinear simulations show that moderate FI pressure suppresses transport via zonal flow (ZF) shear, whereas strong FI drive weakens ZFs and enhances transport by destabilizing FI-BAEs. These results highlight the dual role of FIs in regulating turbulence and offer insight into multiscale transport physics relevant for high-performance plasmas. |
| title | Impact of fast ions on turbulent transport in high-\b{eta} HL-2A scenarios |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2512.22611 |