On impurity retention e ff ect in the edge ergodic layer of LHD

Masahiro KOBAYASHI1), Yuehe FENG2), Sigeru MORITA1), Kuninori SATO1), Malay Bikas CHOWDHURI 3), Suguru MASUZAKI1), Mamoru SHOJI 1), Yukio NAKAMURA 1), Masayuki TOKITANI1), Nobuyoshi OHYABU1), Motoshi GOTO1), Tomohiro MORISAKI1), Ichihiro YAMADA 1), Kazumichi NARIHARA1), Naoko ASHIKAWA1), Hiroshi YAMADA 1), Akio KOMORI1), Osamu MOTOJIMA1) and the LHD experimental group 1)National Institute for Fusion Science, Toki 509-5292, Japan 2)Max-Planck-Institute fuer Plasmaphysik, Wendelsteinstrasse 1, D-17491 Greifswald, Germany 3)Graduate University for Advanced Studies, Toki 509-5292, Gifu, Japan