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首页> 外文期刊>Plasma physics and controlled fusion >Study of Doppler reflectometry capability to determine the perpendicular velocity and the k-spectrum of the density fluctuations using a 2D full-wave code
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Study of Doppler reflectometry capability to determine the perpendicular velocity and the k-spectrum of the density fluctuations using a 2D full-wave code

机译：多普勒反射法研究使用二维全波代码确定密度波动的垂直速度和k谱的能力的研究

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摘要

The capability of Doppler reflectometry to determine the perpendicular velocity and the perpendicular wave-number spectrum of the density fluctuations has been studied using a two-dimensional full-wave code. The numerical results show that the perpendicular velocity of the density fluctuations can be obtained with high accuracy for broad ranges of antenna tilt angles, turbulence levels and radial correlation lengths of the density fluctuations. The diagnostic potential of Doppler reflectometry to determine the perpendicular wave-number spectrum of the density fluctuations depends on the reflectometer response at different probed wave numbers and different turbulence levels. A linear dependence between the scattered wave amplitude and the turbulence level has been found for low turbulence levels and short radial correlation lengths of the density fluctuations, whereas at high turbulence levels and/or large radial correlation lengths the relationship becomes non-linear. In addition, numerical results show that the reflectometer response depends only very slightly on the probed wave number.
机译：使用二维全波代码研究了多普勒反射法确定密度波动的垂直速度和垂直波数谱的能力。数值结果表明，对于宽范围的天线倾斜角，湍流水平和径向相关长度的密度波动，可以高精度地获得密度波动的垂直速度。多普勒反射仪确定密度波动的垂直波谱的诊断潜力取决于反射计在不同探测波数和不同湍流水平下的响应。对于低湍流水平和较短的密度波动的径向相关长度，已经发现了散射波幅度和湍流水平之间的线性相关性，而在高湍流水平和/或较大的径向相关长度中，该关系变为非线性。此外，数值结果表明，反射仪的响应仅在很小程度上取决于探测波数。

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