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

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Comparison of edge turbulence imaging at two different poloidal locations in the scrape-off layer of Alcator C-Mod (Articolo in rivista) (literal)

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S. J. Zweben; J. L. Terry; M. Agostini; W. M. Davis; A. Diallo; R. A. Ellis; T. Golfinopoulos; O. Grulke; W. Hughes; B. LaBombard; M. Landreman; J. R. Myra; D. C. Pace; D. P. Stotler (2013)
Comparison of edge turbulence imaging at two different poloidal locations in the scrape-off layer of Alcator C-Mod
in Physics of plasmas; AIP Publishing LLC, Melville, NY 11747 (Stati Uniti d'America)
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S. J. Zweben; J. L. Terry; M. Agostini; W. M. Davis; A. Diallo; R. A. Ellis; T. Golfinopoulos; O. Grulke; W. Hughes; B. LaBombard; M. Landreman; J. R. Myra; D. C. Pace; D. P. Stotler (literal)

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Article Number: 072503. La rivista è pubblicata anche online con ISSN 1089-7674. (literal)

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1 Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA - 2 Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA - 3 Consorzio RFX, Associazione Euratom-ENEA sulla fusione, C.so Stati Uniti 4, I-35127 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, USA - 6 General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA - (S. J. Zweben 1, J. L. Terry 2, M. Agostini 3, W. M. Davis 1, A. Diallo 1, R. A. Ellis 1, T. Golfinopoulos 2, O. Grulke 4, J. W. Hughes 2, B. LaBombard 2, M. Landreman 2, J. R. Myra 5, D. C. Pace 6, D. P. Stotler 1) (literal)

Titolo

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

Abstract

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. (literal)

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