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2D modelling of radial correlation reflectometry

G D Conway1997年Plasma Physics and Controlled FusionIF 2.2出版社

The response of a radial correlation reflectometer to turbulent plasma fluctuations in a tokamak/stellarator is studied using a two-dimensional (2D) physical optics/distorted surface model. Reflectometer phase and power time signals are generated numerically using the Helmholtz equation and simulated reflection layers. The layers are linked by a radial (wavenumber) k-spectrum with a common poloidal/transverse k-spectrum and a linear dispersion relation. The radial correlation lengths computed from phase fluctuations and from power fluctuations show variations with the poloidal k-spectral width, the surface fluctuation amplitudes (weak and strong turbulence) and the microwave beam width. is always smaller than the true correlation length (computed from the layer fluctuations) by a factor of to 2 depending only on the fluctuation amplitude. , however, is much larger than for weak fluctuations and drops with increasing fluctuation amplitude to less than also varies with the beam width and poloidal k-spectra, while does not. A relationship, involving the rms phase fluctuation level, is found between and the true correlation length.

日本語訳

径方向相関反射計の、トカマク/ステラレータにおける乱流プラズマ変動に対する応答を、2次元(2D)物理光学/歪曲表面モデルを用いて研究する。反射計の位相およびパワー時間信号は、ヘルムホルツ方程式とシミュレーションされた反射層を用いて数値的に生成される。反射層は、径方向(波数)kスペクトルと、ポロイダル/横方向の共通kスペクトルおよび線形分散関係によって結び付けられる。位相変動から計算された径方向相関長およびパワー変動から計算された径方向相関長は、ポロイダルkスペクトル幅、表面変動振幅(弱い乱流および強い乱流)、およびマイクロ波ビーム幅に応じて変化する。は、層変動から計算された真の相関長よりも常に小さく、その比は変動振幅のみに依存して1から2の範囲で変化する。一方、は、弱い変動ではよりもはるかに大きいが、変動振幅が増加するにつれて減少し、よりも小さくなる。また、はビーム幅およびポロイダルkスペクトルによっても変化するが、は変化しない。位相変動のrmsレベルを含む関係式が、と真の相関長の間に見出される。

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Reflectometry
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