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Effect of Magnetic Ergodicity on Edge Plasma Structure and Divertor Flux Distribution in LHD
Author(s) -
Morisaki T.,
Masuzaki S.,
Goto M.,
Morta S.,
Komori A.,
Ohyabu N.,
Motojima O.
Publication year - 2002
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 - 10.1002/1521-3986(200204)42:2/4<321::aid-ctpp321>3.0.co;2-g
Subject(s) - divertor , ergodicity , plasma , large helical device , physics , magnetic flux , mechanics , flux (metallurgy) , enhanced data rates for gsm evolution , magnetic field , atomic physics , materials science , tokamak , nuclear physics , telecommunications , quantum mechanics , computer science , metallurgy
Strong nonuniformity in the helical divertor flux distribution is seen both in numerical calculations and in experiments. Flux profiles along the divertor trace on the vacuum vessel change according to vacuum magnetic configurations. Diverted particles choose one of two X‐points as the escaping channel to divertor legs, which is determined by the local magnetic shear just inside the X‐point. Ergodicity inside both X‐points is also estimated quantitatively by a measure of Kolmogorov length for each magnetic configuration. The relationship between ergodicity and the choice of X‐point for diverted particles is also discussed.