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Two-dimensional effects of turbulence in density profile measurements by reflectometry

V Zhuravlev, J Sanchez, E de la Luna1996年Plasma Physics and Controlled FusionIF 2.2出版社

A code, based on the WKB two-dimensional approximation, is used to simulate the reflectometry measurements in a turbulent plasma. Fixed frequency simulations both for W7-AS and ITER parameters show an increase in perturbations due to two-dimensional turbulence as the dominant wavelength becomes shorter. In larger devices the perturbation is stronger for a given turbulence level and size. Density profile measurements are simulated for ITER using pulse radar amplitude modulation (AM) and frequency modulation (FM) reflectometers. Using some level of averaging (which includes the signal amplitude to average the time delay) the different techniques give reconstructed profiles which are in good agreement with the average of the actual density profile. Results for different levels of turbulence are also shown.

日本語訳

WKBに基づく二次元近似を用いたコードにより、乱流プラズマ中の反射測定のシミュレーションを行う。W7-ASおよびITERパラメータの両方に対する固定周波数シミュレーションは、主要波長が短くなるにつれて二次元乱流による摂動が増大することを示す。より大型の装置では、所与の乱流レベルおよびサイズに対して摂動がより強くなる。ITERに対する密度分布測定は、パルスレーダー振幅変調(AM)および周波数変調(FM)反射計を用いてシミュレーションされる。ある程度の平均化(時間平均化に信号振幅を含む)を用いることで、異なる手法により再構成された分布は、実際の密度分布の平均と良好に一致する。異なる乱流レベルに対する結果も示される。

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iter低精度(概要文一致)

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Density profilesReflectometry
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