Bi-coherence analysis of fluctuations with long distance correlation in toroidal plasmas

Shigeru Inagaki; Tatsuya Kobayashi; Kimitaka Itoh; Tokihiko Tokuzawa; Sanae I. Itoh; Katsumi Ida; Naoki Tamura; Naoyuki Kasuya; Akihide Fujisawa; Shin Kubo; Takashi Shimozuma; Masatoshi Yagi; Kenji Tanaka; Yoshio Nagayama; Kazuo Kawahata; Hiroshi Yamada

doi:10.1143/JPSJ.81.034501

Bi-coherence analysis of fluctuations with long distance correlation in toroidal plasmas

Shigeru Inagaki, Tatsuya Kobayashi, Kimitaka Itoh, Tokihiko Tokuzawa, Sanae I. Itoh, Katsumi Ida, Naoki Tamura, Naoyuki Kasuya, Akihide Fujisawa, Shin Kubo, Takashi Shimozuma, Masatoshi Yagi, Kenji Tanaka, Yoshio Nagayama, Kazuo Kawahata, Hiroshi Yamada

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article

6 Citations (Scopus)

Abstract

Macro-scale temperature fluctuations, which have long radial correlation length (of the order of the plasma radius), have been discovered on Large Helical Device (LHD). In this paper, non-linear coupling between the long-range fluctuations and microscopic fluctuations is investigated using cross bi-coherence analysis. The significant cross bicoherence between long-range fluctuations and micro-fluctuations is observed in the range of frequency f < 100kHz, where f is the frequency of microscopic fluctuations. It is found that the squared bi-coherence and bi-phase for this three-wave coupling is weakly dependent on the frequency of microscopic fluctuations. These observations demonstrate that the microscopic fluctuations are coherently interacting with long-range fluctuations.

Original language	English
Article number	034501
Journal	journal of the physical society of japan
Volume	81
Issue number	3
DOIs	https://doi.org/10.1143/JPSJ.81.034501
Publication status	Published - Mar 2012

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1143/JPSJ.81.034501

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Inagaki, S., Kobayashi, T., Itoh, K., Tokuzawa, T., Itoh, S. I., Ida, K., Tamura, N., Kasuya, N., Fujisawa, A., Kubo, S., Shimozuma, T., Yagi, M., Tanaka, K., Nagayama, Y., Kawahata, K., & Yamada, H. (2012). Bi-coherence analysis of fluctuations with long distance correlation in toroidal plasmas. journal of the physical society of japan, 81(3), [034501]. https://doi.org/10.1143/JPSJ.81.034501

Bi-coherence analysis of fluctuations with long distance correlation in toroidal plasmas. / Inagaki, Shigeru; Kobayashi, Tatsuya; Itoh, Kimitaka; Tokuzawa, Tokihiko; Itoh, Sanae I.; Ida, Katsumi; Tamura, Naoki; Kasuya, Naoyuki; Fujisawa, Akihide; Kubo, Shin; Shimozuma, Takashi; Yagi, Masatoshi; Tanaka, Kenji; Nagayama, Yoshio; Kawahata, Kazuo; Yamada, Hiroshi.

In: journal of the physical society of japan, Vol. 81, No. 3, 034501, 03.2012.

Research output: Contribution to journal › Article

Inagaki, S, Kobayashi, T, Itoh, K, Tokuzawa, T, Itoh, SI, Ida, K, Tamura, N, Kasuya, N, Fujisawa, A, Kubo, S, Shimozuma, T, Yagi, M, Tanaka, K, Nagayama, Y, Kawahata, K & Yamada, H 2012, 'Bi-coherence analysis of fluctuations with long distance correlation in toroidal plasmas', journal of the physical society of japan, vol. 81, no. 3, 034501. https://doi.org/10.1143/JPSJ.81.034501

Inagaki, Shigeru ; Kobayashi, Tatsuya ; Itoh, Kimitaka ; Tokuzawa, Tokihiko ; Itoh, Sanae I. ; Ida, Katsumi ; Tamura, Naoki ; Kasuya, Naoyuki ; Fujisawa, Akihide ; Kubo, Shin ; Shimozuma, Takashi ; Yagi, Masatoshi ; Tanaka, Kenji ; Nagayama, Yoshio ; Kawahata, Kazuo ; Yamada, Hiroshi. / Bi-coherence analysis of fluctuations with long distance correlation in toroidal plasmas. In: journal of the physical society of japan. 2012 ; Vol. 81, No. 3.

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title = "Bi-coherence analysis of fluctuations with long distance correlation in toroidal plasmas",

abstract = "Macro-scale temperature fluctuations, which have long radial correlation length (of the order of the plasma radius), have been discovered on Large Helical Device (LHD). In this paper, non-linear coupling between the long-range fluctuations and microscopic fluctuations is investigated using cross bi-coherence analysis. The significant cross bicoherence between long-range fluctuations and micro-fluctuations is observed in the range of frequency f < 100kHz, where f is the frequency of microscopic fluctuations. It is found that the squared bi-coherence and bi-phase for this three-wave coupling is weakly dependent on the frequency of microscopic fluctuations. These observations demonstrate that the microscopic fluctuations are coherently interacting with long-range fluctuations.",

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AU - Inagaki, Shigeru

AU - Kobayashi, Tatsuya

AU - Itoh, Kimitaka

AU - Tokuzawa, Tokihiko

AU - Itoh, Sanae I.

AU - Ida, Katsumi

AU - Tamura, Naoki

AU - Kasuya, Naoyuki

AU - Fujisawa, Akihide

AU - Kubo, Shin

AU - Shimozuma, Takashi

AU - Yagi, Masatoshi

AU - Tanaka, Kenji

AU - Nagayama, Yoshio

AU - Kawahata, Kazuo

AU - Yamada, Hiroshi

PY - 2012/3

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N2 - Macro-scale temperature fluctuations, which have long radial correlation length (of the order of the plasma radius), have been discovered on Large Helical Device (LHD). In this paper, non-linear coupling between the long-range fluctuations and microscopic fluctuations is investigated using cross bi-coherence analysis. The significant cross bicoherence between long-range fluctuations and micro-fluctuations is observed in the range of frequency f < 100kHz, where f is the frequency of microscopic fluctuations. It is found that the squared bi-coherence and bi-phase for this three-wave coupling is weakly dependent on the frequency of microscopic fluctuations. These observations demonstrate that the microscopic fluctuations are coherently interacting with long-range fluctuations.

AB - Macro-scale temperature fluctuations, which have long radial correlation length (of the order of the plasma radius), have been discovered on Large Helical Device (LHD). In this paper, non-linear coupling between the long-range fluctuations and microscopic fluctuations is investigated using cross bi-coherence analysis. The significant cross bicoherence between long-range fluctuations and micro-fluctuations is observed in the range of frequency f < 100kHz, where f is the frequency of microscopic fluctuations. It is found that the squared bi-coherence and bi-phase for this three-wave coupling is weakly dependent on the frequency of microscopic fluctuations. These observations demonstrate that the microscopic fluctuations are coherently interacting with long-range fluctuations.

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