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Search for zonal flows in the edge turbulence of Alcator C-Mod (Articolo in rivista)
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- Label
- Search for zonal flows in the edge turbulence of Alcator C-Mod (Articolo in rivista) (literal)
- Anno
- 2012-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1088/0741-3335/54/2/025008 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- S. J. Zweben; J. L. Terry; M. Agostini; R. Hager; J. W. Hughes; J. R. Myra; D. C. Pace; the Alcator C-Mod Group (literal)
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- Article Number: 025008
La rivista è pubblicata anche online con ISSN 1361-6587. (literal)
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- 1 Princeton Plasma Physics Laboratory, Princeton NJ 08540, USA;
2 Massachusetts Institute of Technology, Cambridge MA 02139, USA;
3 Consorzio RFX, Associazione EURATOM, I-35127, Padova, Italy;
4 Max Planck Institute for Plasma Physics, D-85748 Garching, Germany;
5 Lodestar Research Corporation, 2400 Central Ave., Boulder CO 80301, USA;
6 ORISE, Oak Ridge, TN 37831, USA.
(S J Zweben 1, J L Terry 2, M Agostini 3, R Hager 4, J W Hughes 2, J R Myra 5,
D C Pace 6 and the Alcator C-Mod Group) (literal)
- Titolo
- Search for zonal flows in the edge turbulence of Alcator C-Mod (literal)
- 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. (literal)
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