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Diagnostics for current density and radial electric field measurements: overview and recent trends

A J H Donné2002年Plasma Physics and Controlled FusionIF 2.2出版社

The measurements of the current density and the radial electric field profiles in tokamaks have considerably gained importance since advanced operational scenarios have come into play. A detailed knowledge of these profiles is desirable for operational scenarios involving reversed magnetic shear and/or the active control of internal and edge transport barriers. Unfortunately, the current density as well as the radial electric field are among the plasma parameters that are most difficult to diagnose. Routine methods to measure the current density profile are based on the Faraday effect (i.e. polarimetry) and the motional Stark effect (MSE). The most advanced diagnostics for the measurement of the radial electric field in the plasma core are the heavy ion beam probe and again the MSE. This paper will briefly explain the need for detailed measurements of the current density and radial electric field profile. Subsequently, the various diagnostics to measure these parameters will be reviewed. The emphasis will be especially put on recent trends, rather than on an exhaustive overview.

日本語訳

トカマクにおける電流密度と径方向電場分布の測定は、先進的な運転シナリオが導入されて以来、その重要性がかなり高まっている。これらのパラメータの詳細な分布の把握は、磁気シア反転および/または内部・周辺輸送障壁の能動制御を伴う運転シナリオにおいて望ましい。残念ながら、電流密度と径方向電場は、プラズマパラメータの中でも測定が最も困難なものの一つである。電流密度分布を測定する一般的な手法は、ファラデー効果(すなわち偏光計測)とモーション・シュタルク効果に基づいている。プラズマコアにおける径方向電場の測定における最先端の診断法は、重イオンビームプローブと再びモーション・シュタルク効果である。本論文では、まず電流密度と径方向電場分布の詳細な測定の必要性について簡潔に説明する。続いて、これらのパラメータを測定するための様々な診断法を概説する。特に、網羅的な概要ではなく、最近の傾向に重点を置く。

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Plasma diagnosticsRadial electric field
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