Turbulent transport reduction induced by transition on radial electric field shear and curvature through amplitude and cross-phase in torus plasma

摘要: Spatiotemporal evolutions of radial electric field and turbulence are measured simultaneously in the H-mode transition, which is a prototypical example structure formation high-temperature plasmas. In dynamical phase where transport barrier established abruptly, time-space-frequency-resolved turbulent particle flux obtained. Here we report validation mechanism quantitatively. It found that suppressed predominantly by reducing density fluctuation amplitude cross between potential fluctuation. Both shear curvature responsible for suppression as was predicted theory. Turbulence reduction immediately responds to growth non-uniformity saturates, while continuously approaches zero.