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. © 2013 AIP Publishing LLC.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
Zweben, S. J., Terry, J. L., Agostini, M., Davis, W. M., Diallo, A., Ellis, R. A., Golfinopoulos, T., Grulke, O., Hughes, J. W., Labombard, B., Landreman, M., Myra, J. R., Pace, D. C., & Stotler, D. P. (2013). Comparison of edge turbulence imaging at two different poloidal locations in the scrape-off layer of Alcator C-Mod. Physics of Plasmas, 20(7), -. . https://doi.org/10.1063/1.4813758