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          Institute: MPI für Plasmaphysik     Collection: Conference Papers     Display Documents

ID: 60291.0, MPI für Plasmaphysik / Conference Papers
Experimental / theoretical comparisons of the turbulence in the scrape-off-layers of Alacator C-Mod, DIII-D, and NSTX
Authors:Terry, J. L.; Zweben, S. J.; Rudakov, D. L.; Boedo, J. A.; Hallatschek, K.; Maqueda, R. J.; Moyer, R. A.; Bai, B.; Boswell, C. J.; Greenwald, M.; Krasheninnikov, S.; LaBombard, B.; Kopon, D.; Leonard, A. W.; Mahdavi, M. A.; McKee, G. R.; Nevins, W. M.; Rogers, B. N.; Stangeby, P. C.; Stotler, D.; Watkins, J. G.; West, W. P.; Whyte, D. G.; Xu, X. Q.
Publisher:International Atomic Energy Agency
Place of Publication:Vienna
Date of Publication (YYYY-MM-DD):2003
Title of Proceedings:Fusion Energy 2002
Sequence Number:EX/P5-10
Physical Description:CD-ROM
Name of Conference/Meeting:19th Fusion Energy Conference
Place of Conference/Meeting:Lyon (FR)
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:Internal review
Audience:Experts Only
Abstract / Description:The intermittent turbulent transport in the scrape-off-layers of Alcator C-Mod, DIII-D, and NSTX is studied experimentally. On DIII-D the fluctuations of both density and temperature have strongly non-Gaussian statistics, and events with amplitudes above 10 times the mean level are responsible for large fractions of the net particle and heat transport, indicating the importance of turbulence on the transport. In C-Mod and NSTX the turbulence is imaged with a very high density of spatial measurements. The 2-D structure and dynamics of emission from a localized gas puff are observed, and intermittent features (also sometimes called “blobs”) are typically seen. On DIII-D the turbulence is imaged using BES and similar intermittent features are seen. The dynamics of these intermittent features are discussed. The experimental observations are compared with numerical simulations of edge turbulence. The electromagnetic turbulence in a 3-D geometry is computed using non-linear plasma fluid equations. The wavenumber spectra in the poloidal dimension of the simulations are in reasonable agreement with those of the C-Mod experimental images once the response of the optical system is accounted for. The resistive ballooning mode is the dominant linear instability in the simulations.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/Oberflächenphysik
External Affiliations:Massachusetts Institute of Technology, Cambridge, USA; Princeton Plasma Physics Laboratory, Princeton, NJ, USA; University of California, San Diego, CA, USA; Los Alamos National Laboratories, Los Alamos, NM, USA; General Atomics, San Diego, CA, USA; University of Wisconsin, Madison, WI, USA; Lawrence Livermore Laboratory, Livermore, CA, USA; Dartmouth University, Hanover, NH, USA; University of Toronto, Institute for Aerospace Studies, Toronto, Canada; Sandia National Laboratories, Albuquerque, NM, USA
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