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Zonal flow observation by the density fluctuations due to the parametric modulational instability

Nagashima, Yoshihiko*; Ito, Kimitaka*; Ito, Sanae*; Fujisawa, Akihide*; Yagi, Masatoshi*; Hoshino, Katsumichi; Shinohara, Koji; Uehara, Kazuya; Miura, Yukitoshi; Ido, Takeshi*; Ejiri, Akira*; Takase, Yuichi*

The observation of the zonal flow by the analysis of the density fluctuations is presented. Previously, we have observed the oscillating zonal flow (GAM) by the analysis of the potential fluctuations. This time we took notice of the generation mechanism of the GAM, parametric modulational instability, and analysed the density fluctuation data of the JFT-2M tokamak. By the statistical analysis we found that the biphase of the GAM and turbulence changes its sign according to the direction of the magnetic field in consistent with a drift wave turbulence theory. Also we have first found that the magnitude of the nonlinear interaction can be obtained from the density fluctuation as previously obtained from the potential fluctuations.



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