Wide-field turbulence imaging with beam emission spectroscopy

G. R. McKee; R. J. Fonck; M. W. Shafer; I. U. Uzun-Kaymak; Z. Yan

doi:10.1063/1.3495788

Wide-field turbulence imaging with beam emission spectroscopy

G. R. McKee, R. J. Fonck, M. W. Shafer, I. U. Uzun-Kaymak, Z. Yan

Advanced Tokamak Physics

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

Imaging of the size, shape, time-averaged, and time-resolved dynamics of long-wavelength density turbulence structures is accomplished with an expanded, high-sensitivity, wide-field beam emission spectroscopy (BES) diagnostic on DIII-D. A 64-channel BES system is configured with an 8×8 grid of discrete channels that image an approximately 7×9 cm region at the outboard midplane. The grid covers multiple correlation lengths and each channel shape matches the measured radial-poloidal correlation length asymmetry of turbulent eddies. The wide field 8×8 imaging capability allows for sampling of essentially the full two-dimensional spatial correlation function for typical plasma conditions. The sampled area can be radially scanned over 0.4<r/a<1, including the core (ñ /n<1%), pedestal, and scrape-off-layer. The resulting time-resolved visualizations of turbulence and flows provide critical data on turbulence dynamics.

Original language	English
Article number	10D741
Journal	Review of Scientific Instruments
Volume	81
Issue number	10
DOIs	https://doi.org/10.1063/1.3495788
State	Published - Oct 2010

Funding

The authors thank the DIII-D program for support of this diagnostic development research project, as well as R. Nazikian and A. Nagy (Princeton Plasma Physics Laboratory) for valuable assistance with the diagnostic expansion. This work supported by U.S. DOE under Grant Nos. DE-FG02-89ER53296, DE-FG02-08ER54999, and DE-AC05-00OR22725.

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725, DE-FG02-08ER54999, DE-FG02-89ER53296

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1063/1.3495788

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abstract = "Imaging of the size, shape, time-averaged, and time-resolved dynamics of long-wavelength density turbulence structures is accomplished with an expanded, high-sensitivity, wide-field beam emission spectroscopy (BES) diagnostic on DIII-D. A 64-channel BES system is configured with an 8×8 grid of discrete channels that image an approximately 7×9 cm region at the outboard midplane. The grid covers multiple correlation lengths and each channel shape matches the measured radial-poloidal correlation length asymmetry of turbulent eddies. The wide field 8×8 imaging capability allows for sampling of essentially the full two-dimensional spatial correlation function for typical plasma conditions. The sampled area can be radially scanned over 0.4",

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AU - Shafer, M. W.

AU - Uzun-Kaymak, I. U.

AU - Yan, Z.

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AB - Imaging of the size, shape, time-averaged, and time-resolved dynamics of long-wavelength density turbulence structures is accomplished with an expanded, high-sensitivity, wide-field beam emission spectroscopy (BES) diagnostic on DIII-D. A 64-channel BES system is configured with an 8×8 grid of discrete channels that image an approximately 7×9 cm region at the outboard midplane. The grid covers multiple correlation lengths and each channel shape matches the measured radial-poloidal correlation length asymmetry of turbulent eddies. The wide field 8×8 imaging capability allows for sampling of essentially the full two-dimensional spatial correlation function for typical plasma conditions. The sampled area can be radially scanned over 0.4

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Wide-field turbulence imaging with beam emission spectroscopy

Abstract

Funding

UN SDGs

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