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Tokamak equilibrium reconstruction using Faraday rotation measurements

F. Hofmann, G. Tonetti1988年被引用 119Nuclear FusionIF 3出版社

A new equilibrium reconstruction procedure using magnetic, line integrated electron density and Faraday rotation measurements has been developed. The method has been applied to a number of elongated tokamak equilibria which were computed by using a free-boundary MHD equilibrium code. Typical errors in four global plasma parameters (βp, ℓi, μ and q0) are evaluated as functions of the measurement errors and the number of source function parameters. Assuming realistic random perturbations in the measurements, the method allows source functions with up to six independent parameters to be reconstructed. It is shown that, when electron density and Faraday rotation measurements are included, the accuracy in the determination of q0 is increased by at least a factor of two, compared with cases without Faraday rotation data. The effects of adding a diamagnetic probe and of varying the plasma elongation are also investigated.

日本語訳

新しい平衡再構成手順が、磁気測定、線積分電子密度測定、およびファラデー回転測定を用いて開発された。この手法は、自由境界MHD平衡コードを用いて計算された複数の細長いトカマク平衡に適用された。4つのグローバルプラズマパラメータ(βp、ℓi、μ、q0)における典型的な誤差が、測定誤差とソース関数パラメータ数の関数として評価される。測定における現実的なランダム摂動を仮定すると、この手法により、最大6つの独立したパラメータを持つソース関数の再構成が可能となる。電子密度測定とファラデー回転測定を含めると、q0の決定精度が、ファラデー回転データがない場合と比較して、少なくとも2倍向上することが示される。反磁性プローブの追加とプラズマ伸長度の変化の影響も調査される。

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Equilibrium reconstruction
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