Wide-field turbulence imaging with beam emission spectroscopy

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 8x8 grid of discr...

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Bibliographic Details
Published in:Review of scientific instruments 2010-10, Vol.81 (10)
Main Authors: McKee, G. R., Fonck, R. J., Uzun-Kaymak, I. U., Yan, Z., Shafer, M. W.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAMS
CORRELATIONS
DOUBLET-3 DEVICE
ELECTRON TEMPERATURE
EMISSION SPECTROSCOPY
GRIDS
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
PLASMA SCRAPE-OFF LAYER
SHAPE
TIME RESOLUTION
TURBULENCE
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Description
Summary: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 8x8 grid of discrete channels that image an approximately 7x9 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 8x8 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
ISSN:0034-6748
1089-7623
DOI:10.1063/1.3495788