Self-consistent gyrokinetic modelling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas
The effect of toroidal rotation on both turbulent and neoclassical transport of tungsten (W) in tokamaks is investigated using the flux-driven, global, nonlinear 5D gyrokinetic code GYSELA. Nonlinear simulations are carried out with different levels of momentum injection that drive W to the super...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/171673 |
| _version_ | 1811686361712820224 |
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| author | Lim, Kyungtak Garbet, Xavier Sarazin, Y. Gravier, E. Lesur, M. Lo-Cascio, G. Rouyer, T. |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Lim, Kyungtak Garbet, Xavier Sarazin, Y. Gravier, E. Lesur, M. Lo-Cascio, G. Rouyer, T. |
| author_sort | Lim, Kyungtak |
| collection | NTU |
| description | The effect of toroidal rotation on both turbulent and neoclassical transport
of tungsten (W) in tokamaks is investigated using the flux-driven, global,
nonlinear 5D gyrokinetic code GYSELA. Nonlinear simulations are carried out
with different levels of momentum injection that drive W to the supersonic
regime, while the toroidal velocity of the main ions remains in the subsonic
regime. The numerical simulations demonstrate that toroidal rotation induces
centrifugal forces that cause W to accumulate in the outboard region,
generating an in-out poloidal asymmetry. This asymmetry enhances neoclassical
inward convection, which can lead to central accumulation of W in cases of
strong plasma rotation. The core accumulation of W is mainly driven by inward
neoclassical convection. However, as momentum injection continues,
roto-diffusion, proportional to the radial gradient of the toroidal velocity,
becomes significant and generate outward turbulent flux in the case of ion
temperature gradient (ITG) turbulence. Overall, the numerical results from
nonlinear GYSELA simulations are in qualitative agreement with the theoretical
predictions for impurity transport, as well as experimental observations. |
| first_indexed | 2024-10-01T04:59:12Z |
| format | Journal Article |
| id | ntu-10356/171673 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:59:12Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1716732023-11-06T15:35:09Z Self-consistent gyrokinetic modelling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas Lim, Kyungtak Garbet, Xavier Sarazin, Y. Gravier, E. Lesur, M. Lo-Cascio, G. Rouyer, T. School of Physical and Mathematical Sciences Science::Physics Poloidal Asymmetries Impurity Transport The effect of toroidal rotation on both turbulent and neoclassical transport of tungsten (W) in tokamaks is investigated using the flux-driven, global, nonlinear 5D gyrokinetic code GYSELA. Nonlinear simulations are carried out with different levels of momentum injection that drive W to the supersonic regime, while the toroidal velocity of the main ions remains in the subsonic regime. The numerical simulations demonstrate that toroidal rotation induces centrifugal forces that cause W to accumulate in the outboard region, generating an in-out poloidal asymmetry. This asymmetry enhances neoclassical inward convection, which can lead to central accumulation of W in cases of strong plasma rotation. The core accumulation of W is mainly driven by inward neoclassical convection. However, as momentum injection continues, roto-diffusion, proportional to the radial gradient of the toroidal velocity, becomes significant and generate outward turbulent flux in the case of ion temperature gradient (ITG) turbulence. Overall, the numerical results from nonlinear GYSELA simulations are in qualitative agreement with the theoretical predictions for impurity transport, as well as experimental observations. Published version This work has been carried out within the framework of the EUROfusion Consortium, partially funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No. 101052200–EUROfusion). The Swiss contribution to this work has been funded by the Swiss State Secretariat for Education, Research and Innovation (SERI). 2023-11-03T07:50:39Z 2023-11-03T07:50:39Z 2023 Journal Article Lim, K., Garbet, X., Sarazin, Y., Gravier, E., Lesur, M., Lo-Cascio, G. & Rouyer, T. (2023). Self-consistent gyrokinetic modelling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas. Physics of Plasmas, 30(8), 082501-. https://dx.doi.org/10.1063/5.0157428 1070-664X https://hdl.handle.net/10356/171673 10.1063/5.0157428 2-s2.0-85166939700 8 30 082501 en Physics of Plasmas © 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http:// creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/5.0157428 application/pdf |
| spellingShingle | Science::Physics Poloidal Asymmetries Impurity Transport Lim, Kyungtak Garbet, Xavier Sarazin, Y. Gravier, E. Lesur, M. Lo-Cascio, G. Rouyer, T. Self-consistent gyrokinetic modelling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas |
| title | Self-consistent gyrokinetic modelling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas |
| title_full | Self-consistent gyrokinetic modelling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas |
| title_fullStr | Self-consistent gyrokinetic modelling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas |
| title_full_unstemmed | Self-consistent gyrokinetic modelling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas |
| title_short | Self-consistent gyrokinetic modelling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas |
| title_sort | self consistent gyrokinetic modelling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas |
| topic | Science::Physics Poloidal Asymmetries Impurity Transport |
| url | https://hdl.handle.net/10356/171673 |
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