[Table of Contents]

Plasma and Fusion Research

Volume 1, 023 (2006)

Rapid Communications


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 and the LHD Experimental Group
National Institute for Fusion Science
(Received 11 January 2006 / Accepted 23 March 2006 / Published 28 April 2006)

Abstract

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


Keywords

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

DOI: 10.1585/pfr.1.023


References

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This paper may be cited as follows:

Kazumichi NARIHARA , Ryuichi SAKAMOTO , Ichihiro YAMADA , Hisamichi FUNABA , Mamoru SHOJI , Masayuki YOKOYAMA , Hiroshi HAYASHI and the LHD Experimental Group, Plasma Fusion Res. 1, 023 (2006).