Open AccessComparison of edge turbulence imaging at two different poloidal locations in the scrape-off layer of Alcator C-Mod
Author(s) -
S. J. Zweben,
J. L. Terry,
M. Agostini,
W. M. Davis,
A. Diallo,
R. Ellis,
T. Golfinopoulos,
O. Grulke,
J. W. Hughes,
B. LaBombard,
Matt Landreman,
J. R. Myra,
D. C. Pace,
D.P. Stotler
Publication year - 2013
Publication title -
physics of plasmas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.75
H-Index - 160
eISSN - 1089-7674
pISSN - 1070-664X
DOI - 10.1063/1.4813758
Subject(s) - alcator c mod , physics , divertor , turbulence , tokamak , flux (metallurgy) , plasma , flux tube , plasma diagnostics , magnetic field , computational physics , tilt (camera) , optics , magnetic flux , mechanics , geometry , nuclear physics , materials science , mathematics , quantum mechanics , metallurgy
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.
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