Abstract
Gas-puff imaging data is used to investigate the dynamics of blob-like structures in the scrape-off layer of Alcator C-Mod. A blob-tracking algorithm is developed and used to compute blob propagation velocities and cross-field sizes for a series of discharges where the line-averaged particle density n¯e is varied. We find that the mean radial blob velocity increases from 150ms-1 for n¯e/nG=0.15 to 450ms-1 for n¯e/nG=0.48, where is the nG the Greenwald density. The cross-field size of the blobs is independent of the line-averaged particle densities. With increasing n¯e/nG the observed blob velocities become larger than predicted by simple blob models for sheath-connected plasma filaments.
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