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Spatial and wavenumber resolution of Doppler reflectometry

E Z Gusakov, A V Surkov2004年Plasma Physics and Controlled FusionIF 2.2出版社

Doppler reflectometry spatial and wavenumber resolution is analysed within the framework of the linear Born approximation in the slab plasma model. An explicit expression for its signal backscattering (BS) spectrum is obtained in terms of the wavenumber and frequency spectra of turbulence, which is assumed to be radially statistically inhomogeneous. The scattering efficiency for both back (BS) and forward scattering (FS) (in the radial direction) is introduced and shown to be inversely proportional to the square of the radial wavenumber of the probing wave at the fluctuation location, thus making the spatial resolution of diagnostics sensitive to the density profile. It is shown that in the case of FS additional localization can be provided by the antenna diagram. It is demonstrated that in the case of BS the spatial resolution can be better if the turbulence spectrum at high radial wavenumbers is suppressed. The improvement in Doppler reflectometry data localization by a probing beam focusing on the cut-off is proposed and described. It is shown that Doppler reflectometry data interpretation based on the obtained expressions is possible.

日本語訳

ドップラー反射測定の空間分解能および波数分解能を、スラブプラズマモデルにおける線形ボルン近似の枠組み内で解析する。その信号の後方散乱(BS)スペクトルに対する明示的な式を、動径方向に統計的に不均一であると仮定した乱流の波数および周波数スペクトルの観点から導出する。後方散乱(BS)および前方散乱(FS)(動径方向)の両方に対する散乱効率を導入し、それが擾乱位置における探査波の動径波数の二乗に反比例することを示す。これにより、診断の空間分解能が密度分布に依存することになる。FSの場合には、アンテナダイアグラムによって追加の局在化がもたらされ得ることを示す。BSの場合には、高動径波数における乱流スペクトルが抑制されれば、空間分解能が向上し得ることを実証する。カットオフに集束する探査ビームによるドップラー反射測定データの局在化の改善を提案し、記述する。得られた式に基づくドップラー反射測定データの解釈が可能であることを示す。

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ReflectometryDoppler reflectometry
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