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  Experimental characterization of coherent, radially-sheared zonal flows in the DIII-D tokamak

McKee, G. R., Fonck, R. J., Jakubowski, M. W., Burrell, K. H., Hallatschek, K., Moyer, R. A., et al. (2003). Experimental characterization of coherent, radially-sheared zonal flows in the DIII-D tokamak. Physics of Plasmas, 10(5), 1712-1719. doi:10.1063/1.1559974.

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McKee, G. R.1, Autor
Fonck, R. J.1, Autor
Jakubowski, M. W.2, Autor           
Burrell, K. H.1, Autor
Hallatschek, K.3, 4, Autor           
Moyer, R. A.1, Autor
Rudakov, D. L.1, Autor
Nevins, W.1, Autor
Porter, G. D.1, Autor
Schoch, P.1, Autor
Xu, X.1, Autor
Affiliations:
1University of Wisconsin—Madison, Madison, Wisconsin 53706; General Atomics, P.O. Box 85608, San Diego, California 92186; University of California, San Diego, La Jolla, California 92093; Lawrence Livermore National Laboratory, Livermore, California 94551, ou_persistent22              
2External Organizations, ou_persistent22              
3Centre for Interdisciplinary Plasma Science (CIPS), Max Planck Institute for Plasma Physics, Max Planck Society, ou_2074325              
4Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856309              

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 Zusammenfassung: The application of time-delay-estimation techniques to two-dimensional measurements of density fluctuations, obtained with beam emission spectroscopy in DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] plasmas, has provided temporally and spatially resolved measurements of the turbulence flow-field. Features that are characteristic of self-generated zonal flows are observed in the radial region 0.85 ≤ r/a ≤ 1.0. These features include a coherent oscillation (approximately 15 kHz) in the poloidal flow of density fluctuations that has a long poloidal wavelength, possibly m = 0, narrow radial extent (krρI<0.2), and whose frequency varies monotonically with the local temperature. The approximate effective shearing rate, dvθ/dr, of the flow is of the same order of magnitude as the measured nonlinear decorrelation rate of the turbulence, and the density fluctuation amplitude is modulated at the frequency of the observed flow oscillation. Some phase coherence is observed between the higher wavenumber density fluctuations and low frequency poloidal flow fluctuations, suggesting a Reynolds stress contribution. These characteristics are consistent with predicted features of zonal flows, specifically identified as geodesic acoustic modes, observed in 3-D Braginskii simulations of core/edge turbulence.

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Sprache(n): eng - English
 Datum: 2003
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: Expertenbegutachtung
 Art des Abschluß: -

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Titel: Physics of Plasmas
  Alternativer Titel : Phys. Plasmas
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Copyright © 2003 American Institute of Physics
Seiten: - Band / Heft: 10 (5) Artikelnummer: - Start- / Endseite: 1712 - 1719 Identifikator: -