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首页> 美国卫生研究院文献>Scientific Reports >Turbulent transport reduction induced by transition on radial electric field shear and curvature through amplitude and cross-phase in torus plasma
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Turbulent transport reduction induced by transition on radial electric field shear and curvature through amplitude and cross-phase in torus plasma

机译：环形等离子体中振幅和交叉相变引起的径向电场切变和曲率过渡引起的湍流输运减少

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摘要

Spatiotemporal evolutions of radial electric field and turbulence are measured simultaneously in the H-mode transition, which is a prototypical example of turbulence structure formation in high-temperature plasmas. In the dynamical phase where transport barrier is established abruptly, the time-space-frequency-resolved turbulent particle flux is obtained. Here we report the validation of the mechanism of transport barrier formation quantitatively. It is found that the particle flux is suppressed predominantly by reducing density fluctuation amplitude and cross phase between density fluctuation and potential fluctuation. Both radial electric field shear and curvature are responsible for the amplitude suppression as was predicted by theory. Turbulence amplitude reduction immediately responds to the growth of the radial electric field non-uniformity and saturates, while cross phase continuously approaches zero.
机译：在H型跃迁中同时测量径向电场和湍流的时空演变，这是高温等离子体中湍流结构形成的典型示例。在突然建立输运势垒的动力学阶段，获得了时空频率分辨的湍流通量。在这里，我们报告量化的运输壁垒形成机制的验证。已经发现，主要通过减小密度波动幅度和密度波动与电位波动之间的交叉相位来抑制颗粒通量。正如理论所预测的，径向电场的剪切和曲率都对振幅的抑制起作用。湍流振幅减小立即响应径向电场不均匀性的增长并饱和，而交叉相位连续接近零。

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