Search for zonal flows in the edge turbulence of Alcator C-Mod

S.J. Zweben, J.L. Terry, M. Agostini, R. Hager, J.W. Hughes, J.R. Myra, D.C. Pace

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Abstract

The time-dependent radial and poloidal velocity of edge turbulence is evaluated using a 2D time-delayed cross-correlation analysis of fast camera data from the gas puff imaging (GPI) diagnostic viewing the outer midplane region in Alcator C-Mod. The local poloidal velocity fluctuations are averaged over the poloidal viewing region of the GPI diagnostic and radially resolved over ±2cm around the separatrix. The resulting poloidal velocity usually has a broadband frequency spectrum in the range 120kHz, and a radial correlation width which decreases with increasing line-averaged density. In some cases with ICRH heating there was also a coherent poloidal velocity oscillation at 67kHz which was highly correlated with a poloidal magnetic field oscillation at the same frequency. Some of these results are similar to the geodesic acoustic modes and/or zonal flows described in previous experiments and theory. © 2012 IOP Publishing Ltd.
Original languageEnglish
Article number025008
Pages (from-to)-
JournalPlasma Physics and Controlled Fusion
Volume54
Issue number2
DOIs
Publication statusPublished - Feb 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Zweben, S. J., Terry, J. L., Agostini, M., Hager, R., Hughes, J. W., Myra, J. R., & Pace, D. C. (2012). Search for zonal flows in the edge turbulence of Alcator C-Mod. Plasma Physics and Controlled Fusion, 54(2), -. [025008]. https://doi.org/10.1088/0741-3335/54/2/025008