Study of Edge Transport Barrier Formation on CHS Plasma
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概要
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An edge transport barrier (ETB) similar to the tokamak H-mode has been observed for beam-heated plasma with two co-injected Neutral Beam Injectors (NBIs) in CHS. The Hα emission showed a clear spontaneous drop followed by an increase of line-averaged electron density at the L-H transition. Stored energy increased by ˜ 40% with H-factor improvement up to ˜ 30% compared to the international stellarator scaling (ISS04v03). A rapid density increase in the edge region to two-times level of the L-mode was observed to accompany a ˜ 15% increase in the density gradient. An ETB was formed when the plasma density exceeded the lower density limit by ˜ 1.5 × 1013 cm-3 and the total NBI power exceeds the threshold level (Pdeposit / ne ˜ 200 × 10-13 kW/cm-3 at BT = 0.95 T, Rax = 92.1 cm, where Pdeposit is the deposited NBI power, ne is electron density, BT is troidal magnetic field strength and Rax is location of magnetic axis). The power threshold increased with the magnetic field strength, as in tokamak scaling, and depends on the magnetic field configuration of the helical plasma.
著者
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YOSHIMURA Yasuo
National Insitute for Fusion Science
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IDA Katsumi
National Insitute for Fusion Science
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ISOBE Mitsutaka
National Insitute for Fusion Science
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MINAMI Takashi
National Insitute for Fusion Science
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TOI Kazuo
National Insitute for Fusion Science
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YOSHINUMA Mikiro
National Insitute for Fusion Science
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MATSUOKA Keisuke
National Institute for Fusion Science
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TAKAHASHI Chihiro
National Institute for Fusion Science
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Iguchi Harukazu
National Institute For Fusion Science
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Fujisawa Akihide
National Institute For Fusion Science
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SUZUKI Chihiro
National Institute for Fusion Science
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NAKAMURA Kiichiro
National Institute for Fusion Science
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NISHIMURA Shin
National Institute for Fusion Science
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NISHIURA Masaki
National Institute for Fusion Science
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OKAMURA Shoichi
National Institute for Fusion Science
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Minami Takashi
National Institute For Fusion Science
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NAKANO Haruhisa
Department of Orthodontics, Showa University School of Dentistry
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Akiyama Tsuyoshi
National Cardiovascular Center
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Shimizu Akihiro
National Inst. For Fusion Sci. Toki 509-5292 Jpn
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NAGAOKA Kenichi
National Institute for Fusion Science
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OHISHI Tetsutaro
Department of Quantum Engineering and System Science, Tokyo University
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OHSHIMA Shinsuke
Department of Energy Engineering and Science, Nagoya University
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NARUHIRO Zenzo
National Institute for Fusion Science
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NAKANO Haruhisa
Department of Fusion Science, The Graduate University for Advanced Studies
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