TITLE

Wide-field turbulence imaging with beam emission spectroscopy

AUTHOR(S)
McKee, G. R.; Fonck, R. J.; Shafer, M. W.; Uzun-Kaymak, I. U.; Yan, Z.
PUB. DATE
October 2010
SOURCE
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D741
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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
ACCESSION #
54857923

 

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