Screening effect of plasma flow on the resonant magnetic perturbation penetration in tokamak based on two-fluid model
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2021
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| _version_ | 1866910173440770048 |
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| author | Tang, Weikang Luan, Qibin Sun, Hongen Wei, Lai Lu, Shuangshuang Jiang, Shuai Xu, Jian Wang, Zhengxiong |
| author_facet | Tang, Weikang Luan, Qibin Sun, Hongen Wei, Lai Lu, Shuangshuang Jiang, Shuai Xu, Jian Wang, Zhengxiong |
| contents | Numerical simulation on the resonant magnetic perturbation penetration is carried out by the newly-updated initial value code MDC (MHD@Dalian Code). Based on a set of two-fluid four-field equations, the bootstrap current, parallel and perpendicular transport effects are included appropriately. Taking into account the bootstrap current, a mode penetration like phenomenon is found, which is essentially different from the classical tearing mode model. It may provide a possible explanation for the finite mode penetration threshold at zero rotation detected in experiments. To reveal the influence of diamagnetic drift flow on the mode penetration process, $\bf E\times B$ drift flow and diamagnetic drift flow are separately applied to compare their effects. Numerical results show that, a sufficiently large diamagnetic drift flow can drive a strong stabilizing effect on the neoclassical tearing mode. Furthermore, an oscillation phenomenon of island width is discovered. By analyzing in depth, it is found that, this oscillation phenomenon is due to the negative feedback regulation of pressure on the magnetic island. This physical mechanism is verified again by key parameter scanning. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2108_09621 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Screening effect of plasma flow on the resonant magnetic perturbation penetration in tokamak based on two-fluid model Tang, Weikang Luan, Qibin Sun, Hongen Wei, Lai Lu, Shuangshuang Jiang, Shuai Xu, Jian Wang, Zhengxiong Plasma Physics Numerical simulation on the resonant magnetic perturbation penetration is carried out by the newly-updated initial value code MDC (MHD@Dalian Code). Based on a set of two-fluid four-field equations, the bootstrap current, parallel and perpendicular transport effects are included appropriately. Taking into account the bootstrap current, a mode penetration like phenomenon is found, which is essentially different from the classical tearing mode model. It may provide a possible explanation for the finite mode penetration threshold at zero rotation detected in experiments. To reveal the influence of diamagnetic drift flow on the mode penetration process, $\bf E\times B$ drift flow and diamagnetic drift flow are separately applied to compare their effects. Numerical results show that, a sufficiently large diamagnetic drift flow can drive a strong stabilizing effect on the neoclassical tearing mode. Furthermore, an oscillation phenomenon of island width is discovered. By analyzing in depth, it is found that, this oscillation phenomenon is due to the negative feedback regulation of pressure on the magnetic island. This physical mechanism is verified again by key parameter scanning. |
| title | Screening effect of plasma flow on the resonant magnetic perturbation penetration in tokamak based on two-fluid model |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2108.09621 |