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Report No.

Experimental progress on zonal flow physics in toroidal plasmas

Fujisawa, Akihide*; Ido, Takeshi*; Shimizu, Akihiro*; Okamura, Shoichi*; Matsuoka, Keisuke*; Iguchi, Harukazu*; Hamada, Yasuji*; Nakano, Haruhisa*; Oshima, Shinsuke*; Ito, Kimitaka*; Hoshino, Katsumichi; Shinohara, Koji; Miura, Yukitoshi; Nagashima, Yoshihiko*; Ito, Sanae*; Shats, M.*; Xia, H.*; Dong, J. Q.*; Yan, L. W.*; Zhao, K. J.*; Conway, G. D.*; Stroth, U.*; Melnikov, A. V.*; Eliseev, L. G.*; Lysenko, S. E.*; Perfilov, S. V.*; Hidalgo, C.*; Tynan, G. R.*; Holland, C.*; Diamond, P. H.*; Mckee, G. R.*; Fonck, R. J.*; Gupta, D. K.*; Schoch, P. M.*

Present status of experiments on zonal flows is overviewed. Innovative use of modern diagnostics has revealed the existence of zonal flows, their spatio-temporal characteristics, their relationship with turbulence, and their effects on confinement. Particularly a number of observations have been accumulated on the oscillatory branch of the zonal flow, dubbed as geodesic acoustic modes suggesting necessity of theories to give their proper description. Several new methods have elucidated the zonal flow generation processes from the turbulence. Further investigation of relationship between the zonal flows and confinement is strongly encouraged as cross-device activity.



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Category:Physics, Fluids & Plasmas



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