Observation of Electron-Temperature Fluctuations Triggered by Supersonic Gas Puffing in the LHD
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概要
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Non-local transport and electron temperature fluctuations triggered by supersonic gas puffing (SSGP) in high-temperature helical plasmas in the Large Helical Device (LHD) are reported. After a short-pulse SSGP, the core electron temperature increased while the edge electron temperature decreased. SSGP triggered a longer core temperature increase than that triggered by a small impurity pellet injection. The temperature profile, which was relatively flat inside the half minor radius before SSGP, became parabolic after non-local transport was triggered. Fluctuations were excited in the electron temperature signals around the half minor radius. The frequency of these fluctuations increased from ∼ 400 Hz to ∼ 1 kHz within ∼ 0.1 s and the amplitude decreased correspondingly. The temperature fluctuations inside and outside of the half minor radius had opposite phases. Magnetic fluctuations resonating near the half minor radius were observed simultaneously with the electron temperature fluctuations.
著者
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YAMADA Hiroshi
National Insitute for Fusion Science
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MORISAKI Tomohiro
National Insitute for Fusion Science
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NARUSHIMA Yoshiro
National Insitute for Fusion Science
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SAKAMOTO Ryuichi
National Insitute for Fusion Science
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MIYAZAWA Junichi
National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
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Tamura Naoki
National Institute For Fusion Science
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TSUCHIYA Hayato
National Institute for Fusion Science, Toki 509-5292, Japan
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MORISAKI Tomohiro
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
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MURASE Takanori
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
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MURAKAMI Akiyoshi
The Graduate University for Advanced Studies, 322-6 Oroshi-cho, Toki 509-5292, Japan
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YASUI Koji
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
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TSUCHIYA Hayato
National Institute for Fusion Science, 322-6 Oroshi, Toki 509-5292, Japan
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MIYAZAWA Junichi
National Institute for Fusion Science
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TSUCHIYA Hayato
National Institute for Fusion Science
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