Laser Scattering Measurement of the Electron Density Fluctuations in CHS
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概要
- 論文の詳細を見る
For measurement of electron density fluctuations (up to 1 MHz), an HCN laser scattering measurement system with a super rotating grating was developed on CHS. When we measured electron density fluctuations with kr = 5.4 cm-1 in a plasma edge region at the outer side of torus, fluctuation spectra which have harmonic components up to the fifth were observed. The fundamental frequency was less than about 60 kHz, which changed during the discharge. The change in frequency correlated best with the plasma stored energy divided by the line averaged density. An edge transport barrier (ETB), which can improve particle transport in the edge region, has been observed in CHS and the measured fluctuation amplitude also decreases. The fluctuations decreased in about 5 ms, and the decrease of the fluctuations preceded by 3 ms to the drop of Hα emission signal.
- 社団法人 プラズマ・核融合学会の論文
著者
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KAWAHATA Kazuo
National Insitute for Fusion Science
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Okajima Shigeki
Chubu University
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OKAMURA Shoichi
National Institute for Fusion Science
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NAKAYAMA Kazuya
Chubu University
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Tsuji-Iio Shunji
Tokyo Institute of Technology
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Tsutsui Hiroaki
Tokyo Institute of Technology
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SHIMADA Ryuichi
Tokyo Institute of Technology
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Akiyama Tsuyoshi
National Cardiovascular Center
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Kawahata Kazuo
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
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HIGUCHI Kenji
Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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AZUMA Yoshifumi
Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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OKAJIMA Shigeki
Chubu University, Matsumoto-cho, Kasugai-shi, Aichi 487-8501, Japan
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TSUJI-IIO Shunji
Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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TSUTSUI Hiroaki
Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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