Density Reconstruction Using a Multi-Channel Far-Infrared Laser Interferometer and Particle Transport Study of a Pellet-Injected Plasma on the LHD

Kenji TANAKA; Kazuo KAWAHATA; Tokihiko TOKUZAWA; Shigeki OKAJIMA; Yasuhiko ITO; Katsunori MURAOKA; Ryuichi SAKAMOTO; Kiyomasa WATANABE; Tomohiro MORISAKI; Hiroshi YAMADA; the LHD Experimental group

doi:10.1585/pfr.3.050

Regular Articles

Density Reconstruction Using a Multi-Channel Far-Infrared Laser Interferometer and Particle Transport Study of a Pellet-Injected Plasma on the LHD

Kenji TANAKA, Kazuo KAWAHATA, Tokihiko TOKUZAWA, Shigeki OKAJIMA, Yasuhiko ITO, Katsunori MURAOKA, Ryuichi SAKAMOTO, Kiyomasa WATANABE, Tomohiro MORISAKI, Hiroshi YAMADA, the LHD Experimental group

Author information

Kenji TANAKA
National Institute for Fusion Science, Toki 509-5292, Japan
Kazuo KAWAHATA
National Institute for Fusion Science, Toki 509-5292, Japan
Tokihiko TOKUZAWA
National Institute for Fusion Science, Toki 509-5292, Japan
Shigeki OKAJIMA
School of Engineering, Chubu University, Kasugai 487-8501, Japan
Yasuhiko ITO
National Institute for Fusion Science, Toki 509-5292, Japan
Katsunori MURAOKA
School of Engineering, Chubu University, Kasugai 487-8501, Japan
Ryuichi SAKAMOTO
National Institute for Fusion Science, Toki 509-5292, Japan
Kiyomasa WATANABE
National Institute for Fusion Science, Toki 509-5292, Japan
Tomohiro MORISAKI
National Institute for Fusion Science, Toki 509-5292, Japan
Hiroshi YAMADA
National Institute for Fusion Science, Toki 509-5292, Japan
the LHD Experimental group
National Institute for Fusion Science, Toki 509-5292, Japan

Keywords: multi-channel far-infrared interferometer, pellet injection, particle transport, convection velocity, diffusion coefficient, density peaking, Large Helical Device (LHD), reflectometry

JOURNAL FREE ACCESS

2008 Volume 3 Pages 050

DOI https://doi.org/10.1585/pfr.3.050

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Abstract

Radial density profiles are obtained by applying the database slice and stuck density reconstruction technique to measured line-integrated densities, using multi-channel far-infrared laser interferometer installed on the Large Helical Device (LHD). A novel method that considers flux surfaces in the reconstruction process has been developed and applied successfully to a pellet-injected discharge in the LHD, enabling the identification of transient density peaking due to an inward pinch and enhanced diffusion in the edge region. The relationship between the change in particle transport and measured turbulence information obtained using reflectometry was also studied.

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