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Computer tomography of M=1 mode during sawtooth oscillation with three soft X-ray detector arrays on the WT-3 tokamak

K Hanada, K Ogura, S Ide, H Tanaka, M Iida, T Ito, M Iwamasa, M Yoshida, T Minami, M Nakamura1990年Plasma Physics and Controlled FusionIF 2.2出版社

Soft X-rays (SXRs) emitted from plasma in the WT-3 tokamak were measured by three SXR detector arrays, viewing the plasma from three different angles. From these experimental data, the authors reconstructed the two dimensional (2-D) contour of constant SXR emissivity as a function of time, using the technique of computer tomography (CT). Computer simulation results show that data from three or more sets of detector arrays are required to reconstruct the 2-D emissivity structure with sufficient accuracy to distinguish Kadomtsev's model from the quasi-interchange (Wesson's) model of sawtooth crash. Further, it is shown that if the noise amplitude is more than 1.5%, reconstruction of the real 2-D SXR emissivity structure is difficult.

日本語訳

WT-3トカマクにおけるプラズマから放出される軟X線(SXR)を、3つの異なる角度からプラズマを観測する3組のSXR検出器アレイを用いて測定した。これらの実験データから、コンピュータトモグラフィー(CT)法を用いて、軟X線発光率の2次元(2-D)等値線の時間変化を再構成した。コンピュータシミュレーションの結果、鋸歯状クラッシュのカドムツェフモデルと準交換(ウェッソン)モデルを十分な精度で区別するためには、3組以上の検出器アレイからのデータが必要であることが示された。さらに、ノイズ振幅が1.5%を超えると、実際の2次元軟X線発光率構造の再構成が困難になることが明らかにされた。

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Sawtooth oscillationSoft x-ray
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