Study of turbulence intermittency in linear magnetized plasma

Boyu Zhang, Shigeru Inagaki, Kazunobu Hasamada, Kotaro Yamasaki, Fumiyoshi Kin, Yoshihiko Nagashima, Takuma Yamada, Akihide Fujisawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The intermittent behavior of a quasi-coherent density fluctuation is observed in a laboratory plasma. The quasi-coherent fluctuation is localized but intermittent events are observed in the whole region of plasma. Conditional averaging shows the intermittent events propagate from the central region of the magnetized plasma column to the peripheral region. Auto-correlation function of fluctuations and Hurst analysis reveal the intermittency is highly auto-correlated and the Hurst parameter reaches to 0.8, indicating the existence of self-similar behavior and long-range time correlation, and self-organized criticality dynamics might be the mechanism. Cross-bicoherence between different radii shows the nonlinear coupling between the quasi-coherent fluctuation and ambient turbulence, which will contribute to the generation of intermittency of turbulence.

Original languageEnglish
Article number115010
JournalPlasma Physics and Controlled Fusion
Volume61
Issue number11
DOIs
Publication statusPublished - Oct 7 2019

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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