Edge Turbulence Imaging in the Alcator C-Mod Tokamak

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The 2-D radial vs. poloidal structure of edge turbulence in the Alcator C-Mod tokamak [I.H. Hutchinson, R. Boivin, P.T. Bonoli et al., Nuclear Fusion 41(2001) 1391] was measured using fast cameras and compared with 3-D numerical simulations of edge plasma turbulence. The main diagnostic is Gas Puff Imaging (GPI), in which the visible D(subscript alpha) emission from a localized D(subscript 2) gas puff is viewed along a local magnetic field line. The observed D(subscript alpha) fluctuations have a typical radial and poloidal scale of approximately 1 cm, and often have strong local maxima (''blobs'') in the scrape-off layer. The motion ... continued below

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1020 Kilobytes pages

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Zweben, S.J.; Stotler, D.P.; Terry, J.L.; LaBombard, B.; Greenwald, M.; Muterspaugh, M. et al. November 26, 2001.

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The 2-D radial vs. poloidal structure of edge turbulence in the Alcator C-Mod tokamak [I.H. Hutchinson, R. Boivin, P.T. Bonoli et al., Nuclear Fusion 41(2001) 1391] was measured using fast cameras and compared with 3-D numerical simulations of edge plasma turbulence. The main diagnostic is Gas Puff Imaging (GPI), in which the visible D(subscript alpha) emission from a localized D(subscript 2) gas puff is viewed along a local magnetic field line. The observed D(subscript alpha) fluctuations have a typical radial and poloidal scale of approximately 1 cm, and often have strong local maxima (''blobs'') in the scrape-off layer. The motion of this 2-D structure motion has also been measured using an ultra-fast framing camera with 12 frames taken at 250,000 frames/sec. Numerical simulations produce turbulent structures with roughly similar spatial and temporal scales and transport levels as that observed in the experiment; however, some differences are also noted, perhaps requiring diagnostic improvement and/or additional physics in the numerical model.

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1020 Kilobytes pages

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INIS; OSTI as DE00792843

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  • Other Information: PBD: 26 Nov 2001

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  • Report No.: PPPL-3631
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/792843 | External Link
  • Office of Scientific & Technical Information Report Number: 792843
  • Archival Resource Key: ark:/67531/metadc738221

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  • November 26, 2001

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  • Oct. 19, 2015, 7:39 p.m.

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  • April 15, 2016, 9:58 p.m.

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Zweben, S.J.; Stotler, D.P.; Terry, J.L.; LaBombard, B.; Greenwald, M.; Muterspaugh, M. et al. Edge Turbulence Imaging in the Alcator C-Mod Tokamak, report, November 26, 2001; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc738221/: accessed April 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.