Comparison of edge turbulence imaging at two different poloidal locations in the scrape-off layer of Alcator C-Mod

Journal Article · Mon Jul 15 00:00:00 EDT 2013 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4813758· OSTI ID:22227948

Zweben, S. J.; Davis, W. M.; Diallo, A.; Ellis, R. A.; Stotler, D. P. ^[1]; Terry, J. L.; Golfinopoulos, T.; Hughes, J. W.; LaBombard, B.; Landreman, M. ^[2]; Agostini, M. ^[3]; Grulke, O. ^[4]; Myra, J. R. ^[5]; Pace, D. C. ^[6]

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1. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540 (United States)
2. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
3. Consorzio RFX, Associazione Euratom-ENEA sulla fusione, C.so Stati Uniti 4, I-3512 Padova (Italy)
4. Max Planck Institute for Plasma Physics, EURATOM Association, D-17491 Greifswald (Germany)
5. Lodestar Research Corporation, 2400 Central Ave., Boulder, Colorado 80301 (United States)
6. General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)

This paper describes 2D imaging measurements of plasma turbulence made in the scrape-off layer of the Alcator C-Mod tokamak simultaneously at two different poloidal locations, one near the outer midplane and the other near the divertor X-point region. These images were made with radial and poloidal resolution using two gas puff imaging diagnostics not directly connected along a B field line. The turbulence correlation structure has a significantly different tilt angle with respect to the local flux surfaces for the midplane and X-regions, and a slightly different ellipticity and size. The time-averaged turbulence velocities can be different in the midplane and X-regions, even within the same flux surface in the same shot. The structures are partially consistent with a magnetic flux tube mapping model, and the velocities are compared with various models for turbulence flow.

• OSTI ID: 22227948
• Journal Information: Physics of Plasmas, Vol. 20, Issue 7; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALCATOR DEVICE
COMPARATIVE EVALUATIONS
CORRELATIONS
DIVERTORS
MAGNETIC FLUX
MAGNETIC SURFACES
MAGNETOHYDRODYNAMICS
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
PLASMA SCRAPE-OFF LAYER
THERMONUCLEAR REACTORS
TURBULENCE