Intermittent characteristics in coupling between turbulence and zonal flows

A. Fujisawa; A. Shimizu; H. Nakano; S. Ohshima; K. Itoh; Y. Nagashima; Sanae Itoh; H. Iguchi; Y. Yoshimura; T. Minami; K. Nagaoka; C. Takahashi; M. Kojima; S. Nishimura; M. Isobe; C. Suzuki; T. Akiyama; T. Ido; K. Matsuoka; S. Okamura; P. H. Diamond

doi:10.1088/0741-3335/49/3/002

Intermittent characteristics in coupling between turbulence and zonal flows

A. Fujisawa, A. Shimizu, H. Nakano, S. Ohshima, K. Itoh, Y. Nagashima, Sanae Itoh, H. Iguchi, Y. Yoshimura, T. Minami, K. Nagaoka, C. Takahashi, M. Kojima, S. Nishimura, M. Isobe, C. Suzuki, T. Akiyama, T. Ido, K. Matsuoka, S. OkamuraP. H. Diamond

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

An extended application of Gabour's wavelet to bicoherence analysis succeeds in resolving the instantaneous structure of three wave couplings between disparate scale electric field fluctuations in the high temperature core in a toroidal plasma device named the compact helical system. The obtained results quantify an intermittent linkage between turbulence and zonal flows - a highlighted issue in the present plasma research. This is the first demonstration that the intermittent nature of the three wave coupling should underlie the turbulence power modulation due to zonal flows.

Original language	English
Article number	002
Pages (from-to)	211-217
Number of pages	7
Journal	Plasma Physics and Controlled Fusion
Volume	49
Issue number	3
DOIs	https://doi.org/10.1088/0741-3335/49/3/002
Publication status	Published - Mar 1 2007

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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Fujisawa, A., Shimizu, A., Nakano, H., Ohshima, S., Itoh, K., Nagashima, Y., Itoh, S., Iguchi, H., Yoshimura, Y., Minami, T., Nagaoka, K., Takahashi, C., Kojima, M., Nishimura, S., Isobe, M., Suzuki, C., Akiyama, T., Ido, T., Matsuoka, K., ... Diamond, P. H. (2007). Intermittent characteristics in coupling between turbulence and zonal flows. Plasma Physics and Controlled Fusion, 49(3), 211-217. [002]. https://doi.org/10.1088/0741-3335/49/3/002

Fujisawa, A , Shimizu, A, Nakano, H, Ohshima, S, Itoh, K, Nagashima, Y, Itoh, S, Iguchi, H, Yoshimura, Y, Minami, T, Nagaoka, K, Takahashi, C, Kojima, M, Nishimura, S, Isobe, M, Suzuki, C, Akiyama, T, Ido, T, Matsuoka, K, Okamura, S & Diamond, PH 2007, 'Intermittent characteristics in coupling between turbulence and zonal flows', Plasma Physics and Controlled Fusion, vol. 49, no. 3, 002, pp. 211-217. https://doi.org/10.1088/0741-3335/49/3/002

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AU - Fujisawa, A.

AU - Shimizu, A.

AU - Nakano, H.

AU - Ohshima, S.

AU - Itoh, K.

AU - Nagashima, Y.

AU - Itoh, Sanae

AU - Iguchi, H.

AU - Yoshimura, Y.

AU - Minami, T.

AU - Nagaoka, K.

AU - Takahashi, C.

AU - Kojima, M.

AU - Nishimura, S.

AU - Isobe, M.

AU - Suzuki, C.

AU - Akiyama, T.

AU - Ido, T.

AU - Matsuoka, K.

AU - Okamura, S.

AU - Diamond, P. H.

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AB - An extended application of Gabour's wavelet to bicoherence analysis succeeds in resolving the instantaneous structure of three wave couplings between disparate scale electric field fluctuations in the high temperature core in a toroidal plasma device named the compact helical system. The obtained results quantify an intermittent linkage between turbulence and zonal flows - a highlighted issue in the present plasma research. This is the first demonstration that the intermittent nature of the three wave coupling should underlie the turbulence power modulation due to zonal flows.

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Intermittent characteristics in coupling between turbulence and zonal flows

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