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Observation of Filamentary Structures on the Boundary Region of the LHD Stellarator
Author(s) -
Carralero D.,
Shoji M.,
de la Cal E.,
van Milligen B. Ph.,
de Pablos J. L.,
Hidalgo C.,
Yamada H.
Publication year - 2011
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.200900063
Subject(s) - large helical device , stellarator , physics , plasma , enhanced data rates for gsm evolution , boundary (topology) , computational physics , mechanics , atomic physics , nuclear physics , telecommunications , computer science , mathematical analysis , mathematics
Large Helical Device (LHD) high β regime discharges are observed with a fast camera, with 〈 β 〉 values up to almost 5%. High frequency sequences (20 µs between shots) of the density fluctuations in the edge region are obtained. Macroscopic coherent scructures, in the shape of “comet”‐like filaments can be seen in these sequences, propagating from the external ergodic region to the wall. These structures are analyzed and their radial and parallel transport is discussed. Strong relation between the generation of low frequency particle ejections and m/n= 2/3 edge mode is found. In the strike point region, “reflected” structures are observed as a response to ejected filaments. These are discussed in terms of plasma wall interaction phenomena (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)