Observation of Blobs and Holes in the Boundary Plasma of EAST Tokamak

YAN Ning; XU Guosheng; ZHANG Wei; CHANG Jiafeng; WANG Liang; LIU Shaocheng; LIU pen

Plasma Science and Technology > 2011 > 13(4): 410-414.

YAN Ning, XU Guosheng, ZHANG Wei, CHANG Jiafeng, WANG Liang, LIU Shaocheng, LIU pen. Observation of Blobs and Holes in the Boundary Plasma of EAST Tokamak[J]. Plasma Science and Technology, 2011, 13(4): 410-414.

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Observation of Blobs and Holes in the Boundary Plasma of EAST Tokamak

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

Funds: supported by the National Nature Science Foundation of China(Nos 11075181, 10725523, 10721505, 10990212, 10605028) and the 973 Programme under contract 2010GB104001

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Received Date: December 09, 2010

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Abstract

Abstract

Intermittent convective transport at the edge and in the scrape-off layer (SOL) of EAST was investigated by using fast reciprocating Langmuir probe. Holes, as part of plasma structures, were detected for the first time inside the shear layer. The amplitude probability distribution function of the turbulence is strongly skewed, with positive skewed events (“blobs”) prevailing in the SOL region and negative skewed events (“holes”) dominant inside the shear layer. The statistical properties coincide with previous observations from JET
[Nuclear Fusion 49 (2009) 092002.]. The generation mechanism of blobs and holes is also discussed. In addition burst structure and dynamics character of them are also presented.
- intermittent transport,
- blobs,
- holes,
- generation mechanism,
- dynamics character

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