Spatial structure of scrape-off-layer filaments near the midplane and X-point regions of Alcator C-Mod [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 2008.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: PDF-file: 19 pages; size: 0.3 Mbytes
Additional Creators:: Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Movies of edge turbulence at both the outboard midplane and the region outboard of the typical lower X-point location in C-Mod have been obtained using Gas-Puff-Imaging together with fast-framing cameras. Intermittent turbulent structures, typically referred to as blobs or filaments, are observed in both locations. Near the midplane the filaments are roughly circular in cross-section, while in the X-point region they are highly elongated. Filament velocities in this region are ≈3x faster than the radial velocities at the midplane, in a direction roughly normal to the local flux surfaces. The observations are consistent with the picture that the filaments arise in outboard region and, as a consequence of the rapid parallel diffusion of the potential perturbations, map along field lines. A simulation using the 3D BOUT turbulence code has been made, with the result that reproduces many of the spatial features observed in the experiment.

Report Numbers:

E 1.99:llnl-conf-404224
llnl-conf-404224

Subject(s):

Plasma Physics And Fusion

Other Subject(s):

Note:

Published through SciTech Connect.
05/22/2008.
"llnl-conf-404224"
Presented at: 18th Conference on Plasma Surface Interactions, Toledo, Spain, May 26 - May 30, 2008.
LaBombard, B; Cziegler, I; Grulke, O; Terry, J L; Umansky, M V; Zweben, S J; Stotler, D P.

Funding Information:

W-7405-ENG-48

View MARC record | catkey: 14738093