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Correlation reflectometry in fusion plasmas—an application at TEXTOR

A Krämer-Flecken, S Soldatov, Y Xu, T Zhang2011年Plasma Physics and Controlled FusionIF 2.2出版社

Correlation reflectometry (CR) is based on the simultaneous measurement of two or more spatially separated antennae at one or more frequencies with a high spatial and temporal resolution. It is sensitive to plasma density fluctuations at a reflection layer deduced from reflections of a probing wave with a frequency in the mm range. In fusion plasmas it is an appropriate tool to investigate instabilities based on small scale structures or wave phenomena. Furthermore, it provides the measurement of plasma rotation perpendicular to the local magnetic field under the assumption of frozen turbulence.An overview of CR diagnostics installed at different devices is presented. The different applications principles as measurement of turbulence properties e.g. decorrelation time and correlation length are highlighted. Also the measurement of the pitch angle to deduce the local magnetic field is discussed. Furthermore, the often used application to determine the turbulence rotation is presented.Recent measurements at TEXTOR with two reflectometers and three distributed antennae arrays will be presented. The long range correlations of density and velocity oscillations of the geodesic acoustic mode are investigated. But also properties of the ambient turbulence are studied. Measurements of radial correlation length of the ambient turbulence are performed for two poloidal positions, too. From these measurements the scaling of the radial turbulence correlation length is found to be gyro-Bohm-like.

日本語訳

相関反射測定(CR)は、高い空間的・時間的分解能を有する1つまたは複数の周波数において、空間的に分離された2つ以上のアンテナを用いた同時測定に基づく。本手法は、ミリ波帯の周波数を有する探査波の反射から推定される反射層におけるプラズマ密度揺動に敏感である。核融合プラズマにおいて、本手法は小規模構造または波動現象に基づく不安定性の調査に適したツールである。さらに、凍結乱流の仮定の下で、局所磁場に垂直なプラズマ回転の測定を提供する。異なる装置に設置されたCR診断の概要を示す。乱流特性(例えば、非相関時間や相関長)の測定といった異なる応用原理を強調する。また、局所磁場を推定するためのピッチ角の測定についても議論する。さらに、乱流回転を決定するために頻繁に用いられる応用についても提示する。TEXTORにおける2つの反射計と3つの分布アンテナアレイを用いた最近の測定結果を示す。測地音響モードの密度および速度振動の長距離相関を調査する。しかし、周辺乱流の特性も研究対象である。2つのポロイダル位置において、周辺乱流の径方向相関長の測定も実施した。これらの測定から、径方向乱流相関長のスケーリングはジャイロボーム的であることが見出された。

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