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Simulations tackle abrupt massive migrations of energetic beam ions in a tokamak plasma
https://repo.qst.go.jp/records/49545
https://repo.qst.go.jp/records/495456aa19a9f-287c-4e65-809c-993f840ac247
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2019-02-05 | |||||
| タイトル | ||||||
| タイトル | Simulations tackle abrupt massive migrations of energetic beam ions in a tokamak plasma | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
ビアワーゲ, アンドレアス
× ビアワーゲ, アンドレアス× 篠原, 孝司× 藤堂, 泰× 相羽, 信行× 石川, 正男× 松永, 剛× 武智, 学× 矢木, 雅敏× ビアワーゲ アンドレアス× 篠原 孝司× 藤堂 泰× 相羽 信行× 石川 正男× 松永 剛× 武智 学× 矢木 雅敏 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In the late 1990s, fusion scientists at the Japanese tokamak JT-60U discovered abrupt large-amplitude events during beam-driven deuterium plasma experiments. A large spike in the magnetic fluctuation signal followed by a drop in the neutron emission rate indicates that energetic ions abruptly migrate out of the plasma core during an intense burst of Alfvén waves that lasts only 0.3 ms. With continued beam injection, the energetic ion population recovers until the next event occurs 40–60 ms later. Here we present results from simulations that successfully reproduce multiple migration cycles and report numerical and experimental evidence for the multi-mode nature of these intermittent phenomena. Moreover, we elucidate the role of collisional slow-down and show that the large-amplitude Alfvénic fluctuations can drive magnetic reconnection and induce macroscopic magnetic islands. In this way, our simulations allow us to gradually unravel the underlying physical processes and develop predictive capabilities. | |||||
| 書誌情報 |
Nature Communications 巻 9, p. 3282-1-3282-11, 発行日 2018-08 |
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| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1038/s41467-018-05779-0 | |||||
