Direct Observation of Inward Electron Flux being Blocked in the Large Helical Device

Kazumichi NARIHARA; Ryuichi SAKAMOTO; Ichihiro YAMADA; Hisamichi FUNABA; Mamoru SHOJI; Masayuki YOKOYAMA; Hiroshi HAYASHI; the LHD Experimental Group

doi:10.1585/pfr.1.023

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Direct Observation of Inward Electron Flux being Blocked in the Large Helical Device

Kazumichi NARIHARA, Ryuichi SAKAMOTO, Ichihiro YAMADA, Hisamichi FUNABA, Mamoru SHOJI, Masayuki YOKOYAMA, Hiroshi HAYASHI, the LHD Experimental Group

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Keywords: particle transport, anomalous convection, pellet injection, LHD, Thomson scattering

JOURNAL FREE ACCESS

2006 Volume 1 Pages 023

DOI https://doi.org/10.1585/pfr.1.023

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Abstract

We present a particle transport phenomenon caused by a hydrogen ice pellet injection (PI) into the Large Helical Device. The electron density (n_e) profile evolution after a PI was measured by using a 200-channel Thomson scattering diagnostic. The highly hollow n_e-profile caused by a PI faded out as time elapsed with a very slight increase in the n_e at the core region, giving a direct evidence for the inward electron flux being almost completely blocked in the core region.

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