Structures, wavelet and intermittency in tokamak edge turbulence

Journal Article · Fri Aug 01 04:00:00 EDT 1997 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.872431· OSTI ID:526929

Jha, R; Mattoo, S K; Saxena, Y C ^[1]

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1. Institute for Plasma Research, Bhat, Gandhinagar-382 428 (India)

The wavelet bicoherence technique is used to examine floating potential fluctuations in ADITYA tokamak edge plasma, which have shown vortex-like coherent structures on statistical basis [{ital Proceedings of the 15th International Conference on Plasma Physics and Controlled Nuclear Fusion}, Seville (International Atomic Energy Agency, Vienna, 1995), Vol. 1, p. 583]. On a single discharge basis, the data exhibit intermittent episodes of quadratic interaction in which low and high frequency components are coupled. The broadband nonlinear phase coupling is used as a diagnostic signature of localized coherent structure. It is observed that the wavelet bicoherence is high in the presence of sparse structures and small when the structures are closely packed. The turbulent edge plasma has regions of packed Gaussian structures and sparse non-Gaussian structures. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 526929
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 4; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ADITYA TOKAMAK
BOUNDARY LAYERS
EDGE LOCALIZED MODES
PLASMA DIAGNOSTICS
TURBULENCE
VORTICES