A new quasilinear model for turbulent momentum transport in tokamaks with flow shear and plasma shaping

In tokamak experiments, sufficiently strong E × B flow shear reduces turbulent transport, thereby improving the prospects for fusion power plants. It is therefore of great importance to efficiently explore parameter space to find where strong plasma flow can be achieved. To this end, we propose a ne...

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Bibliographic Details
Published in:Nuclear fusion 2024-03, Vol.64 (3), p.36026
Main Authors: Sun, Haomin, Ball, Justin, Brunner, Stephan, Volčokas, Arnas
Format: Article
Language:English
Subjects:
computational plasma physics
intrinsic rotation in tokamak
momentum transport
plasma physics
Prandtl number
quasi-linear model
turbulence
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Summary:In tokamak experiments, sufficiently strong E × B flow shear reduces turbulent transport, thereby improving the prospects for fusion power plants. It is therefore of great importance to efficiently explore parameter space to find where strong plasma flow can be achieved. To this end, we propose a new, physically motivated quasi-linear model for estimating momentum transport from turbulence in the presence of toroidal flow shear and plasma shaping. The method gives good estimates of momentum transport for up–down asymmetric geometries as well as low magnetic shear and tight aspect ratio. The results are benchmarked with high-fidelity nonlinear GENE simulations, demonstrating that it provides a fast and accurate estimate of momentum transport.
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/ad2583