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Super-Fresnel resolution of plasma inhomogeneities by electromagnetic sounding

M V Tinin, Yu A Kravtsov2008年Plasma Physics and Controlled FusionIF 2.2出版社

The application of the double weighted Fourier transform (DWFT) method is suggested for extracting the linear integral of the electron density in the inhomogeneous plasma from microwave or IR sounding data. The virtue of DWFT is its ability to localize the measured linear integral in the area, narrow as compared with the radius of the Fresnel zone, that is to realize super-Fresnel resolution. The advantages of the DWFT method are illustrated, firstly, by numerical simulation of a wave propagation through the Gaussian inhomogeneity in conditions of weak scattering, when a small angle Born approximation is applicable, and secondly, by theoretical estimates of resolution in conditions of strong scattering. The method under discussion promises to be helpful for studying the fine structure of turbulent plasma.

日本語訳

不均質プラズマ中の電子密度の線形積分をマイクロ波または赤外線サウンディングデータから抽出するために、二重重み付きフーリエ変換(DWFT)法の適用が提案されている。DWFTの利点は、測定された線形積分をフレネルゾーンの半径と比較して狭い領域に局在化できること、すなわち超フレネル分解能を実現できることである。DWFT法の利点は、第一に、小角ボルン近似が適用可能な弱散乱条件下でのガウス型不均質性を通る波動伝播の数値シミュレーションによって、第二に、強散乱条件下での分解能の理論的評価によって示されている。議論中のこの方法は、乱流プラズマの微細構造の研究に有用であることが期待される。

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