Edge Zonal Flows and Blob Propagation in Alcator C-Mod
Authors: S. Zweben, J.L. Terry, M. Agostini, B. Davis, O. Grulke, R. Hager, J. Hughes, B. LaBombard, D.A. D"Ippolito, J.R. Myra and D.A. Russell
Abstract:
Here we describe recent measurements of the 2-D motion of turbulence in the edge and
scrape-off layer (SOL) of the Alcator C-Mod tokamak. This data was taken using the outer
midplane gas puff imaging (GPI) camera, which views a 6 cm radial by 6 cm poloidal region
near the separatrix just below the outer midplane [1]. The data were taken in Ohmic or RF heated
L-mode plasmas at 400,000 frames/sec for ~50 msec/shot using a Phantom 710 camera
in a 64x64 pixel format. The resulting 2-D vs. time movies [2] can resolve the structure and
motion of the turbulence on a spatial scale covering 0.3-6 cm. The images were analyzed
using either a 2-D cross-correlation code (Sec. 2) or a 2-D blob tracking code (Sec. 3).
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Presented at: 38th European Physical Society Conference on Plasma Physics, Strasbourg, France (June 2011)
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