2026 年 21 巻 論文ID: 1402035
In this paper, an experimental consistency check for a theory describing the interplay between micro-scale turbulence and meso- and macro-scale flows is presented. The experimental data obtained in the JFT-2M tokamak are used for the consistency check. After L-H transition, a solitary radial electric field well, driving an E × B flow structure in the electron diamagnetic direction, forms. Turbulence is regulated in the flow shear regions, while it nearly remains essentially unchanged at the peak of the flow structure where the shear is zero. In a theory, this type of turbulence redistribution, called hill-trapping, is predicted to occur when the adiabatic parameter α is larger than unity. In the experiment, α ∼ 40 ≫ 1 is given, supporting the theory. An eigenmode model analysis for the turbulence system is performed for the experimental parameters, and the occurrence of the hill-trapping is found.
