Original title: Fluctuations in the scrape-off layer and edge plasma of the COMPASS tokamak
Authors: Seidl, Jakub ; Jiráková, Kateřina ; Adámek, Jiří ; Grover, Ondřej ; Horáček, Jan ; Hron, Martin ; Vondráček, Petr
Document type: Papers
Conference/Event: 45th European Physical Society Conference on Plasma Physics, Praha (CZ), 20180702
Year: 2018
Language: eng
Abstract: In this work we study properties of turbulent structures in the scrape-off layer (SOL) and edge plasma of the COMPASS tokamak. Two distinct types of coherent oscillations are observed: a) broadband high frequency branch rotating in the electron diamagnetic direction, appearing mainly in the confined region but protruding also to the SOL b) low-frequency blobs rotating in an opposite poloidal direction, formed in the vicinity of the radius of zero electric field. The transition region is localized in the near SOL, where both types spatially overlap and interact and the radial particle transport gradually transfers from high to low frequencies. Even though skewness of fluctuations of the ion saturation current is positive even inside LCFS, distinguishable Gamma-distributed PDF, formed by the low-frequency fluctuations, arises in the near SOL and most of the fluctuations that form a positive skewness in the edge region disappear around LCFS.
Keywords: plasma; tokamak; turbulence
Project no.: GA16-25074S (CEP), 8D15001 (CEP), LM2015045 (CEP)
Funding provider: GA ČR, GA MŠk, GA MŠk
Host item entry: Europhysics Conference Abstracts, ISBN 979-10-96389-08-7

Institution: Institute of Plasma Physics AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: http://ocs.ciemat.es/EPS2018PAP/pdf/P1.1103.pdf
Original record: http://hdl.handle.net/11104/0287755

Permalink: http://www.nusl.cz/ntk/nusl-387456


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