Abstract
The type III ELMs have been measured by a fast reciprocating Langmuir probe array on EAST tokamak during the 2012 autumn campaign. The duration time for the burst of filaments as detected by the probe is in the range of 150–200 μs. The filaments are observed to propagate radially with velocities up to 1.2 km/s in the far scrape-off layer (SOL) and it seems that the velocity is larger at the beginning of the ELM burst. The evolution of the filaments in the SOL has been evaluated by the radial scanning of the probe when ELMs burst repetitively. The results suggest that the intensity of the filaments decrease as the filaments propagate radially in the SOL.
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