Study of non-linear coupling of fluctuations at long distance in LHD

Inagaki Shigeru, T. Tokuzawa, T. Kobayashi, Sanae Itoh, K. Itoh, K. Ida, akihide fujisawa, S. Kubo, T. Shimozuma, N. Tamura, Naohiro Kasuya, H. Tsuchiya, Y. Nagayama

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Abstract

Non-linear coupling between fluctuations at different radial locations is observed on the Large Helical Device (LHD) plasma. The summed bi-coherence between the low frequency macro-scale fluctuation (frequency is f=2.75kHz) at ρ=reff/a99=0.63 (where a99 is averaged plasma radius) and the high-frequency micro-scale fluctuations (frequency range of f>150kHz) at ρ=0.88 is found to converge to a non-zero and finite value. The bi-phase analysis provides another basis for the non-linear interaction across the long distance. These results are associated with the violation local closure for transport relation.

Original languageEnglish
Article number114014
JournalNuclear Fusion
Volume54
Issue number11
DOIs
Publication statusPublished - Oct 1 2014

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Shigeru, I., Tokuzawa, T., Kobayashi, T., Itoh, S., Itoh, K., Ida, K., ... Nagayama, Y. (2014). Study of non-linear coupling of fluctuations at long distance in LHD. Nuclear Fusion, 54(11), [114014]. https://doi.org/10.1088/0029-5515/54/11/114014