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Convergence study of bispectral analysis in experiments of high temperature plasmas

Nagashima, Yoshihiko*; Ito, Sanae*; Yagi, Masatoshi*; Ito, Kimitaka*; Fujisawa, Akihide*; Hoshino, Katsumichi; Shinohara, Koji; Uehara, Kazuya; Kusama, Yoshinori; Ejiri, Akira*; Takase, Yuichi*

A convergence study of bispector non-linear analysis applied to the fluctuation of toroidal plasmas is studied. A theoretical study of the convergence is presented. And it was found that the convergence property of the total bicoherence and bispector of the fluctuations of drift wave or zonal flow observed in the JFT-2M tokamak plasma is consistent with the theoretical analysis, and also found that the realization number for the convergence is fairly large, for example about 1000 for the JFT-2M experimental fluctuation data. As stated, we made a base for such fluctuation analysis.

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