Open AccessStudy of turbulence intermittency in linear magnetized plasma
Author(s) -
Boyu Zhang,
S. Inagaki,
Kazunobu Hasamada,
K. Yamasaki,
Fumiyoshi Kin,
Yoshihiko Nagashima,
Teppei Yamada,
A. Fujisawa
Publication year - 2019
Publication title -
plasma physics and controlled fusion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.328
H-Index - 111
eISSN - 1361-6587
pISSN - 0741-3335
DOI - 10.1088/1361-6587/ab434f
Subject(s) - intermittency , bicoherence , physics , turbulence , plasma , hurst exponent , statistical physics , self organized criticality , nonlinear system , range (aeronautics) , criticality , mechanics , bispectrum , quantum mechanics , spectral density , nuclear physics , statistics , mathematics , materials science , composite material
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.