Geometric curvature effect on suppressing the Ion-Temperature-Gradient mode near the magnetic axis
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866913637084430336 |
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| author | Wu, Tiannan Wang, Shaojie |
| author_facet | Wu, Tiannan Wang, Shaojie |
| contents | Global gyrokinetic simulation of the ion temperature gradient mode shows that the radial electric field ($E_r$) well upshifts the critical temperature gradient near the magnetic axis, in the weak but not in the strong magnetic shear configuration. The geometric curvature effect significantly influences the $E \times B$ shear and the wave number near the axis, so that the $E_r$ well suppresses the high-n modes but has little effect on the low-n modes, which are suppressed by the weak magnetic shear effect. This new finding unravels the formation mechanism of the internal transport barrier in the weak central magnetic shear discharges. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_02960 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Geometric curvature effect on suppressing the Ion-Temperature-Gradient mode near the magnetic axis Wu, Tiannan Wang, Shaojie Plasma Physics Global gyrokinetic simulation of the ion temperature gradient mode shows that the radial electric field ($E_r$) well upshifts the critical temperature gradient near the magnetic axis, in the weak but not in the strong magnetic shear configuration. The geometric curvature effect significantly influences the $E \times B$ shear and the wave number near the axis, so that the $E_r$ well suppresses the high-n modes but has little effect on the low-n modes, which are suppressed by the weak magnetic shear effect. This new finding unravels the formation mechanism of the internal transport barrier in the weak central magnetic shear discharges. |
| title | Geometric curvature effect on suppressing the Ion-Temperature-Gradient mode near the magnetic axis |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2501.02960 |