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First-principles based plasma profile predictions for optimized stellarators
DOI:10.1088/1741-4326/acc3af.png)
摘要
En 中文
In the present Letter, first-of-its-kind computer simulations predicting plasma profiles for modern optimized stellarators-while self-consistently retaining neoclassical transport, turbulent transport with 3D effects, and external physical sources-are presented. These simulations exploit a newly developed coupling framework involving the global gyrokinetic turbulence code GENE-3D, the neoclassical transport code KNOSOS, and the 1D transport solver TANGO. This framework is used to analyze the recently observed degradation of energy confinement in electron-heated plasmas in the Wendelstein 7-X stellarator, where the central ion temperature was clamped' to T-i 1.5 keV regardless of the external heating power. By performing first-principles based simulations, we provide key evidence to understand this effect, namely the inefficient thermal coupling between electrons and ions in a turbulence-dominated regime, which is exacerbated by the large T-e/Ti ratios, and show that a more efficient ion heat source, such as direct ion heating, will increase the on-axis ion temperature. This work paves the way towards the use of high-fidelity models for the development of the next generation of stellarators, in which neoclassical and turbulent transport are optimized simultaneously.
Keyword:
plasma transport
stellarators
gyrokinetics
期刊
IF:
4
论文数:
9.3K
被引数:
2.2W
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