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Modelling of Impurity Transport in Ergodic Layer of LHD
Author(s) -
Kobayashi M.,
Feng Y.,
Masuzaki S.,
Morisaki T.,
Ohyabu N.,
Yamada H.,
Komori A.,
Motojima O.
Publication year - 2008
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.200810044
Subject(s) - divertor , impurity , enhanced data rates for gsm evolution , materials science , plasma , ergodic theory , large helical device , drop (telecommunication) , layer (electronics) , mechanics , condensed matter physics , physics , nanotechnology , tokamak , nuclear physics , computer science , mathematical analysis , mathematics , quantum mechanics , telecommunications
The impurity transport properties in the ergodic layer of LHD are analyzed by the 3D edge transport code as well as 1D simple model, which is used to illustrate the essential transport terms in the analysis. It is found that as the plasma density increases the edge surface layers, very edge region of the ergodic layer, enters friction dominant regime, resulting in impurity retention. It is considered that the cause for the retention is both temperature drop and the flow acceleration in the edge surface layers. The edge surface layers can provide effective retention of impurities coming from divertor as well as the first wall, because of the geometrical advantage of the edge region of LHD. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)