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

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 tu...

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Published inPlasma science & technology Vol. 13; no. 4; pp. 410 - 414
Main Author 颜宁 徐国盛 张炜 常加峰 王亮 刘少承 刘鹏 汪惠乾 蒋敏 熊豪 丁斯晔 万宝年 高翔 V. NAULIN A. H. NIELSEN J. Juul RASMUSSEN
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.08.2011
Subjects
BLOB
对流运输
托卡马克
朗缪尔探针
概率分布函数
等离子体
统计特性
边界
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ISSN1009-0630
DOI10.1088/1009-0630/13/4/05

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Summary: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. The generation mechanism of blobs and holes is also discussed. In addition burst structure and dynamics character of them are also presented.
Bibliography:YAN Ning , XU Guosheng , ZHANG Wei , CHANG Jiafeng , WANG Liang , LIU Shaocheng ,LIU Peng , WANG Huiqian, JIANG Min, XIONG Hao , DING Siye T, WAN Baonian , GAO Xiang , V. NAULIN, A. H. NIELSEN, J. Juul RASMUSSEN（1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China; 2Association Euratom-RisФ DTU, DK-4000 Roskilde, Denmark）
34-1187/TL
intermittent transport, blobs, holes, generation mechanism, dynamics character
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. The generation mechanism of blobs and holes is also discussed. In addition burst structure and dynamics character of them are also presented.
ISSN:1009-0630
DOI:10.1088/1009-0630/13/4/05