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Modelling of polarimetry measurements at JET

F P Orsitto, A Boboc, C Mazzotta, E Giovannozzi, L Zabeo, JET EFDA Contributors2008年Plasma Physics and Controlled FusionIF 2.2出版社

This paper presents a study aimed at validating the ability of the presently available models to predict the Cotton–Mouton (C–M) effect. The Faraday rotation and the C–M phase shift angle can be calculated by means of a rigorous numerical solution of Stokes equations. Numerical and approximated solutions are presented and compared with experimental data. A detailed comparison is done with the time traces of measurements, inside a limited dataset representative of JET regimes. A statistical analysis is then carried out on a dataset including data from 300 discharges. In general the C–M measurements are in agreement with the numerical model, and the line integral of plasma density deduced by the C–M measurements is in agreement with that measured by LIDAR Thomson scattering (well inside the experimental error, which is close to two fringes for the polarimetry measurements, 1 fringe = 1.14 × 1019 m−2).

日本語訳

本論文は、現在利用可能なモデルがコットン・ムートン(C–M)効果を予測する能力を検証することを目的とした研究を提示する。ファラデー回転およびC–M位相シフト角は、ストークス方程式の厳密な数値解法によって計算することができる。数値解および近似解を示し、実験データと比較する。JETの代表的シナリオを含む限定的なデータセット内で、時間トレース測定との詳細な比較が行われる。その後、300回の放電からのデータを含むデータセットに対して統計解析が実施される。全体的に、C–M測定値は数値モデルと一致しており、C–M測定から導出されたプラズマ密度の線積分は、LIDARトムソン散乱による測定値と一致している(実験誤差の範囲内であり、その誤差は偏光測定において約2フリンジに相当する。1フリンジ = 1.14 × 10¹⁹ m⁻²)。

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