Comparison of Edge Turbulence Imaging at Two Different Poloidal Locations in the Scrape-off Layer of Alcator C-Mod

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This paper describes 2-D 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 (GPI) diagnostics, which were 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 ... continued below

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Zweben, S. J.; Terry, J. L.; Agostini, M.; Davis, W. M.; Diallo, A.; Ellis, R. A. et al. March 29, 2013.

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Description

This paper describes 2-D 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 (GPI) diagnostics, which were 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 Xregions, even within the same flux surface in the same shot, and in most cases the fluctuations in poloidal velocity in these two regions were not correlated. These structures are partially consistent with a magnetic flux tube mapping model, and the velocities are compared with various poloidal flow models.

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  • Physics of Plasmas (March 2013)

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  • Report No.: PPPL-4864
  • Grant Number: DE-ACO2-09CH11466
  • DOI: 10.2172/1072360 | External Link
  • Office of Scientific & Technical Information Report Number: 1072360
  • Archival Resource Key: ark:/67531/metadc828845

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  • March 29, 2013

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • June 28, 2016, 12:52 p.m.

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Zweben, S. J.; Terry, J. L.; Agostini, M.; Davis, W. M.; Diallo, A.; Ellis, R. A. et al. Comparison of Edge Turbulence Imaging at Two Different Poloidal Locations in the Scrape-off Layer of Alcator C-Mod, report, March 29, 2013; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc828845/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.