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Edge turbulence imaging in the Alcator C-Mod tokamak

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Hallatschek,  K.
Centre for Interdisciplinary Plasma Science (CIPS), Max Planck Institute for Plasma Physics, Max Planck Society;
Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

Zweben, S. J., Stotler, D. P., Terry, J. L., LaBombard, B., Greenwald, M., Muterspaugh, M., et al. (2002). Edge turbulence imaging in the Alcator C-Mod tokamak. Physics of Plasmas, 9(5), 1981-1989.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-4130-7
Abstract
The two-dimensional (2D) radial vs poloidal structure of edge turbulence in the Alcator C-Mod tokamak [I. H. Hutchinson, R. Boivin, P. T. Bonoli , Nucl. Fusion 41, 1391 (2001)] was measured using fast cameras and compared with three-dimensional numerical simulations of edge plasma turbulence. The main diagnostic is gas puff imaging, in which the visible D-alpha emission from a localized D-2 gas puff is viewed along a local magnetic field line. The observed D-alpha fluctuations have a typical radial and poloidal scale of approximate to1 cm, and often have strong local maxima ("blobs") in the scrape-off layer. The motion of this 2D structure motion has also been measured using an ultrafast framing camera with 12 frames taken at 250 000 frames/s. 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. (C) 2002 American Institute of Physics.