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Author Jakubowski, M. ♦ Fonck, R. J. ♦ Fenzi, C. ♦ McKee, G. R.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ DETECTION ♦ EMISSION SPECTROSCOPY ♦ FLUCTUATIONS ♦ FREQUENCY RANGE ♦ ROTATION ♦ TIME DELAY ♦ TRANSFER FUNCTIONS ♦ TRANSPORT ♦ TURBULENCE ♦ TURBULENT FLOW ♦ VELOCITY
Abstract A wavelet-transform-based spectral analysis is examined for application to beam emission spectroscopy (BES) data to extract poloidal rotation velocity fluctuations from the density turbulence data. Frequency transfer functions for a wavelet cross-phase extraction method are calculated. Numerical noise is reduced by shifting the data to give an average zero time delay, and the applicable frequency range is extended by numerical oversampling of the measured density fluctuations. This approach offers potential for direct measurements of turbulent transport and detection of zonal flows in tokamak plasma turbulence.
ISSN 00346748
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-01-01
Publisher Place United States
Journal Review of Scientific Instruments
Volume Number 72
Issue Number 1


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