Observation of Edge Reynolds Stress Increase Preceding an L-H Transition in Compact Helical System

Yoshihiko NAGASHIMA; Kenichi NAGAOKA; Kimitaka ITOH; Akihide FUJISAWA; Mitsutaka ISOBE; Tsuyoshi AKIYAMA; Chihiro SUZUKI; Shin NISHIMURA; Yasuo YOSHIMURA; Keisuke MATSUOKA; Shoichi OKAMURA; Yuichi TAKASE; Akira EJIRI; Sanae -I. ITOH; Masatoshi YAGI; CHS Group

doi:10.1585/pfr.5.022

Rapid Communications

Observation of Edge Reynolds Stress Increase Preceding an L-H Transition in Compact Helical System

Yoshihiko NAGASHIMA, Kenichi NAGAOKA, Kimitaka ITOH, Akihide FUJISAWA, Mitsutaka ISOBE, Tsuyoshi AKIYAMA, Chihiro SUZUKI, Shin NISHIMURA, Yasuo YOSHIMURA, Keisuke MATSUOKA, Shoichi OKAMURA, Yuichi TAKASE, Akira EJIRI, Sanae -I. ITOH, Masatoshi YAGI, CHS Group

Author information

Yoshihiko NAGASHIMA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 509-5292, Japan
Kenichi NAGAOKA
National Institute for Fusion Science, Toki 509-5292, Japan
Kimitaka ITOH
National Institute for Fusion Science, Toki 509-5292, Japan
Akihide FUJISAWA
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
Mitsutaka ISOBE
National Institute for Fusion Science, Toki 509-5292, Japan
Tsuyoshi AKIYAMA
National Institute for Fusion Science, Toki 509-5292, Japan
Chihiro SUZUKI
National Institute for Fusion Science, Toki 509-5292, Japan
Shin NISHIMURA
National Institute for Fusion Science, Toki 509-5292, Japan
Yasuo YOSHIMURA
National Institute for Fusion Science, Toki 509-5292, Japan
Keisuke MATSUOKA
National Institute for Fusion Science, Toki 509-5292, Japan
Shoichi OKAMURA
National Institute for Fusion Science, Toki 509-5292, Japan
Yuichi TAKASE
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 509-5292, Japan
Akira EJIRI
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 509-5292, Japan
Sanae -I. ITOH
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
Masatoshi YAGI
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
CHS Group
National Institute for Fusion Science, Toki 509-5292, Japan

Keywords: L-H transition, Reynolds stress

JOURNALS FREE ACCESS

Volume 5 (2010) Pages 022

DOI https://doi.org/10.1585/pfr.5.022

Details

Abstract

An increase in turbulent Reynolds stress preceding an L-H transition in the Compact Helical System (CHS) was observed. A positive increase in the Reynolds stress is associated with a negative jump in the floating potential. The relationship of signs is consistent with the momentum balance equation. Therefore, this observation supports the hypothesis that the Reynolds stress plays an important role in triggering the L-H transition in CHS plasmas.

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