Geometry effects on zonal flow dynamics and turbulent transport in optimized stellarators
Plasma Physics
2025-05-29 v1
Abstract
Global gyrokinetic simulations find a strong suppression of ion temperature gradient (ITG) turbulence by zonal flows in stellarators optimized for neoclassical transport. The reduction of the ITG transport by the zonal flows in quasi-helicalsymmetric (QH) and quasi-isodynamic (QI) stellarators are much larger than a quasi-axisymmetric (QA) stellarator or a tokamak, thanks to higher linear residual levels and lower nonlinear frequencies of the zonal flows in the QH and QI. The transport level and energy confinement time in the QH and QI are similar to the tokamak with the same size and temperature gradient, despite the much larger linear growth rates in the stellarators.
Keywords
Cite
@article{arxiv.2505.21886,
title = {Geometry effects on zonal flow dynamics and turbulent transport in optimized stellarators},
author = {Haotian Chen and Xishuo Wei and Hongxuan Zhu and Zhihong Lin},
journal= {arXiv preprint arXiv:2505.21886},
year = {2025}
}
Comments
4 pages, 4 figures,1 table