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Investigation of the consistency of magnetic and soft x-ray plasma position measurements on TCV by means of a rapid tomographic inversion algorithm

J Mlynar, S Coda, A Degeling, B P Duval, F Hofmann, T Goodman, J B Lister, X Llobet, H Weisen2003年Plasma Physics and Controlled FusionIF 2.2出版社

A rapid algorithm for tomographic inversion is presented that allows post-discharge reconstruction of the soft x-ray (SXR) emissivity evolution in the Tokamak à configuration variable (TCV). Simultaneously, it determines the centre of gravity of the emissivity that may serve as a reliable measurement of the plasma position, that is independent of magnetic measurements. Tests of the algorithm were performed using shaped phantom datasets and all past SXR measurements were processed to obtain plasma position statistics. Multiple linear regression is applied in matching the results with the magnetic axis data. Systematic functionalities including magnetic field dependence and drift of the magnetic axis are observed. The joint resolution limit of magnetic and SXR position measurements at TCV is derived from the residual discrepancies and equals 2.2 and 3.1 mm in the radial and vertical directions, respectively.

日本語訳

トモグラフィック逆変換のための高速アルゴリズムを提示し、トカマク・ア・コンフィギュラシオン・バリアブル(TCV)における軟X線(SXR)放射率の時間発展を放電後に再構成することを可能にする。同時に、このアルゴリズムは放射率の重心を決定し、これは磁気測定に依存しないプラズマ位置の信頼できる測定値として機能し得る。このアルゴリズムの検証は、形状化されたファントムデータセットを用いて行われ、また、過去のすべてのSXR測定値を処理してプラズマ位置の統計を取得した。磁気軸データとの結果の照合には、多重線形回帰が適用される。磁場依存性や磁気軸のドリフトを含む系統的な機能が観察される。TCVにおける磁気測定とSXR測定の位置の複合的な分解能限界は、残差の不一致から導出され、径方向および垂直方向においてそれぞれ2.2mmおよび3.1mmに等しい。

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TCVSoft x-rayPlasma position
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