Reducing turbulent transport in tokamaks by combining intrinsic rotation and the low momentum diffusivity regime
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916789113323520 |
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| author | Sun, Haomin Ball, Justin Brunner, Stephan Field, Anthony Patel, Bhavin Kennedy, Daniel Roach, Colin Cruz-Zabala, Diego Jose Del Pozo, Fernando Puentes Viezzer, Eleonora Munoz, Manuel Garcia |
| author_facet | Sun, Haomin Ball, Justin Brunner, Stephan Field, Anthony Patel, Bhavin Kennedy, Daniel Roach, Colin Cruz-Zabala, Diego Jose Del Pozo, Fernando Puentes Viezzer, Eleonora Munoz, Manuel Garcia |
| contents | Based on the analysis of a large number of high-fidelity nonlinear gyrokinetic simulations, we propose a novel strategy to improve confinement in spherical tokamak plasmas by combining up-down asymmetric flux surface shaping with the Low Momentum Diffusivity (LMD) regime. We show that the intrinsic momentum flux driven by up-down asymmetry creates strong flow shear in the LMD regime that can significantly reduce energy transport, increasing the critical gradient by up to $25\%$. In contrast to traditional methods for generating flow shear, such as neutral beam injection, this approach requires no external momentum source and is expected to scale well to large fusion devices. The experimental applicability of this strategy in spherical tokamaks is addressed via simulations by considering actual equilibria from MAST and a preliminary equilibrium from SMART. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_10555 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Reducing turbulent transport in tokamaks by combining intrinsic rotation and the low momentum diffusivity regime Sun, Haomin Ball, Justin Brunner, Stephan Field, Anthony Patel, Bhavin Kennedy, Daniel Roach, Colin Cruz-Zabala, Diego Jose Del Pozo, Fernando Puentes Viezzer, Eleonora Munoz, Manuel Garcia Plasma Physics Fluid Dynamics Based on the analysis of a large number of high-fidelity nonlinear gyrokinetic simulations, we propose a novel strategy to improve confinement in spherical tokamak plasmas by combining up-down asymmetric flux surface shaping with the Low Momentum Diffusivity (LMD) regime. We show that the intrinsic momentum flux driven by up-down asymmetry creates strong flow shear in the LMD regime that can significantly reduce energy transport, increasing the critical gradient by up to $25\%$. In contrast to traditional methods for generating flow shear, such as neutral beam injection, this approach requires no external momentum source and is expected to scale well to large fusion devices. The experimental applicability of this strategy in spherical tokamaks is addressed via simulations by considering actual equilibria from MAST and a preliminary equilibrium from SMART. |
| title | Reducing turbulent transport in tokamaks by combining intrinsic rotation and the low momentum diffusivity regime |
| topic | Plasma Physics Fluid Dynamics |
| url | https://arxiv.org/abs/2410.10555 |