Extracting the turbulent flow-field from beam emission spectroscopy images using velocimetry

D. M. Kriete; G. R. McKee; R. J. Fonck; D. R. Smith; G. G. Whelan; Z. Yan

doi:10.1063/1.5036535

Extracting the turbulent flow-field from beam emission spectroscopy images using velocimetry

D. M. Kriete, G. R. McKee, R. J. Fonck, D. R. Smith, G. G. Whelan, Z. Yan

Research output: Contribution to journal › Review article › peer-review

14 Scopus citations

Abstract

The 2D turbulent E × B flow-field is inferred from density fluctuation images obtained with the beam emission spectroscopy diagnostic on DIII-D using the orthogonal dynamic programming velocimetry algorithm. A synthetic turbulence model is used to test the algorithm and optimize it for measuring zonal flows. Zonal flow measurements are found to require a signal-to-noise ratio above ∼10 and a zonal flow wavelength longer than ∼2 cm. Comparison between the velocimetry-estimated flow-field and the E × B flow-field using a nonlinear gyrokinetic GENE simulation finds that the flow-fields have identical spatial structure and differ only by the mean turbulence phase velocity, which is spatially uniform in this flux tube simulation.

Original language	English (US)
Article number	10E107
Journal	Review of Scientific Instruments
Volume	89
Issue number	10
DOIs	https://doi.org/10.1063/1.5036535
State	Published - Oct 1 2018
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.5036535

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@article{dc31a7c78d71417495b5c19692d6eea9,

title = "Extracting the turbulent flow-field from beam emission spectroscopy images using velocimetry",

abstract = "The 2D turbulent E × B flow-field is inferred from density fluctuation images obtained with the beam emission spectroscopy diagnostic on DIII-D using the orthogonal dynamic programming velocimetry algorithm. A synthetic turbulence model is used to test the algorithm and optimize it for measuring zonal flows. Zonal flow measurements are found to require a signal-to-noise ratio above ∼10 and a zonal flow wavelength longer than ∼2 cm. Comparison between the velocimetry-estimated flow-field and the E × B flow-field using a nonlinear gyrokinetic GENE simulation finds that the flow-fields have identical spatial structure and differ only by the mean turbulence phase velocity, which is spatially uniform in this flux tube simulation.",

author = "Kriete, \{D. M.\} and McKee, \{G. R.\} and Fonck, \{R. J.\} and Smith, \{D. R.\} and Whelan, \{G. G.\} and Z. Yan",

note = "Publisher Copyright: {\textcopyright} 2018 Author(s).",

year = "2018",

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doi = "10.1063/1.5036535",

language = "English (US)",

volume = "89",

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T1 - Extracting the turbulent flow-field from beam emission spectroscopy images using velocimetry

AU - Kriete, D. M.

AU - McKee, G. R.

AU - Fonck, R. J.

AU - Smith, D. R.

AU - Whelan, G. G.

AU - Yan, Z.

PY - 2018/10/1

Y1 - 2018/10/1

N2 - The 2D turbulent E × B flow-field is inferred from density fluctuation images obtained with the beam emission spectroscopy diagnostic on DIII-D using the orthogonal dynamic programming velocimetry algorithm. A synthetic turbulence model is used to test the algorithm and optimize it for measuring zonal flows. Zonal flow measurements are found to require a signal-to-noise ratio above ∼10 and a zonal flow wavelength longer than ∼2 cm. Comparison between the velocimetry-estimated flow-field and the E × B flow-field using a nonlinear gyrokinetic GENE simulation finds that the flow-fields have identical spatial structure and differ only by the mean turbulence phase velocity, which is spatially uniform in this flux tube simulation.

AB - The 2D turbulent E × B flow-field is inferred from density fluctuation images obtained with the beam emission spectroscopy diagnostic on DIII-D using the orthogonal dynamic programming velocimetry algorithm. A synthetic turbulence model is used to test the algorithm and optimize it for measuring zonal flows. Zonal flow measurements are found to require a signal-to-noise ratio above ∼10 and a zonal flow wavelength longer than ∼2 cm. Comparison between the velocimetry-estimated flow-field and the E × B flow-field using a nonlinear gyrokinetic GENE simulation finds that the flow-fields have identical spatial structure and differ only by the mean turbulence phase velocity, which is spatially uniform in this flux tube simulation.

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U2 - 10.1063/1.5036535

DO - 10.1063/1.5036535

M3 - Review article

C2 - 30399767

AN - SCOPUS:85053016210

SN - 0034-6748

VL - 89

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 10

M1 - 10E107

ER -

Extracting the turbulent flow-field from beam emission spectroscopy images using velocimetry

Abstract

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