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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.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]
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  1. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1610030
Alternate Identifier(s):
OSTI ID: 1468504
Grant/Contract Number:  
FG02-08ER54999; SC0001288
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Conference: 22. Topical Conference on High-Temperature Plasma Diagnostics, San Diego, CA (United States), 16-19 Apr; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Instruments & Instrumentation; Physics

Citation Formats

Kriete, D. M., McKee, G. R., Fonck, R. J., Smith, D. R., Whelan, G. G., and Yan, Z. Extracting the turbulent flow-field from beam emission spectroscopy images using velocimetry. United States: N. p., 2018. Web. doi:10.1063/1.5036535.
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Kriete, D. M., McKee, G. R., Fonck, R. J., Smith, D. R., Whelan, G. G., & Yan, Z. Extracting the turbulent flow-field from beam emission spectroscopy images using velocimetry. United States. https://doi.org/10.1063/1.5036535
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Kriete, D. M., McKee, G. R., Fonck, R. J., Smith, D. R., Whelan, G. G., and Yan, Z. Tue . "Extracting the turbulent flow-field from beam emission spectroscopy images using velocimetry". United States. https://doi.org/10.1063/1.5036535. https://www.osti.gov/servlets/purl/1610030.
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@article{osti_1610030,
title = {Extracting the turbulent flow-field from beam emission spectroscopy images using velocimetry},
author = {Kriete, D. M. and McKee, G. R. and Fonck, R. J. and Smith, D. R. and Whelan, G. G. and Yan, Z.},
abstractNote = {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.},
doi = {10.1063/1.5036535},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Tue Sep 04 00:00:00 EDT 2018},
month = {Tue Sep 04 00:00:00 EDT 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5036535
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Cited by: 5 works
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