Plasma and Fusion Research
Volume 5, 022 (2010)
Rapid Communications
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 509-5292, Japan
- 1)
- National Institute for Fusion Science, Toki 509-5292, Japan
- 2)
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
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.
Keywords
L-H transition, Reynolds stress
Full Text
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This paper may be cited as follows:
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 and CHS Group, Plasma Fusion Res. 5, 022 (2010).