Statistically robust linear and nonlinear wavelet analysis applied to plasma edge turbulence

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1147727· OSTI ID:451929

van Milligen, B P; Hidalgo, C; Sanchez, E; Pedrosa, M A; Balbin, R; Garcia-Cortes, I ^[1]; Tynan, G R ^[2]

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1. Asociacion Euratom-CIEMAT, Madrid (Spain)
2. Institute for Plasma and Fusion Research, University of California, Los Angeles, California 90024 (United States)

The analysis of turbulence requires adequate analysis tools. In particular, two general properties of turbulence make the application of standard analysis tools (spectral analysis) difficult: (1) intermittency, which causes the characteristics of turbulence to change on a relatively short time scale, implies that analysis tools must not integrate over time scales longer than the intermittent time scale; (2) nonlinearity, a basic property of all numerical models of chaos and turbulence, requires specially adapted tools for its proper detection. In the present work, we develop a statistically stable formalism for the application of wavelet analysis techniques to the analysis of turbulence. We apply these techniques to the analysis of Langmuir probe data in the plasma edge region of the TJ-IU Torsatron. We draw some tentative conclusions about radial correlation lengths. Further, we analyze the L/H transition at the Continous Current Tokamak and reconstruct a radial profile of bicoherence in the plasma edge in the H-mode. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 451929
• Report Number(s): CONF-960543--
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 1 Vol. 68; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
EDGE LOCALIZED MODES
Langmuir probes
NONLINEAR PROBLEMS
NUMERICAL ANALYSIS
PLASMA DIAGNOSTICS
STABILITY
TJ-1 TOKAMAK
TORSATRON STELLARATORS
TURBULENCE
WAVE PROPAGATION
chaos
plasma boundary layers
plasma turbulence
spectral analysis
wavelet transforms