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

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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 languageEnglish
Article number034501
Journaljournal of the physical society of japan
Volume81
Issue number3
DOIs
Publication statusPublished - Mar 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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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