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Testing instabilities and microturbulence in TEXT

C. Yu, D.L. Brower, S. Zhao, R.V. Bravenec, J. Chen, H. Lin, Jr N.C. Luhmann, W.A. Peebles, C.P. Ritz, P.M. Schoch1992年被引用 32Nuclear FusionIF 3出版社

The physical relationship between naturally occurring large scale (m=2) Mirnov oscillations and small scale turbulence in the Texas Experimental Tokamak (TEXT) is described. Dependences on plasma profiles (e.g. density and potential), which are strongly perturbed in the vicinity of the magnetic islands, are unfolded. Theoretical expectations for tearing modes and electron drift waves are compared with the characteristics of the measured mode amplitudes and frequency spectra. The dispersion relation for the turbulent density fluctuations, which propagate in the electron diamagnetic drift direction, is observed to be consistent with that of electron drift wave theory when a Doppler shift due to E*B plasma rotation is included. The fluctuation magnitude is found to correlate with the electron density scale length in a manner following mixing length estimates

日本語訳

テキサス実験トカマク(TEXT)における自然に発生する大規模(m=2)ミルノフ振動と小規模乱流との間の物理的関係について述べる。磁気島の近傍で強く擾乱されるプラズマ分布(例えば密度や電位)への依存性を明らかにする。測定されたモード振幅と周波数スペクトルを、テアリングモードおよび電子ドリフト波の理論的予測と比較する。電子反磁性ドリフト方向に伝播する乱流的密度変動の分散関係は、E×Bプラズマ回転によるドップラーシフトを考慮すると、電子ドリフト波理論と一致することが観測された。変動の大きさは、密度勾配スケール長と相関し、その関係は混合長推定に従うことが見出された。

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