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Effect of m/n = 2/1 neoclassical tearing mode on sawtooth collapse in JT-60U
https://repo.qst.go.jp/records/83942
https://repo.qst.go.jp/records/83942ab8ec207-dd26-46ca-b19e-5f4d884185ce
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2021-07-20 | |||||
| タイトル | ||||||
| タイトル | Effect of m/n = 2/1 neoclassical tearing mode on sawtooth collapse in JT-60U | |||||
| 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 |
Bando, Takahiro
× Bando, Takahiro× Takuma, Wakatsuki× Honda, Mitsuru× Akihiko, Isayama× Koji, Shinohara× Shizuo, Inoue× Maiko, Yoshida× Go, Matsunaga× Manabu, Takechi× Naoyuki, Oyama× Shunsuke, Ide× Takuma, Wakatsuki× Akihiko, Isayama× Koji, Shinohara× Shizuo, Inoue× Maiko, Yoshida× Go, Matsunaga× Manabu, Takechi× Naoyuki, Oyama× Shunsuke, Ide |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We have investigated the role of the m/n = 2/1 neoclassical tearing mode (NTM) for suppression of the sawtooth collapse in JT-60U from the viewpoint of the anomalous transport of the current diffusion, namely flux pumping. In the stabilization experiments of m/n = 2/1 NTMs by electron cyclotron current drive of JT-60U, it has been clarified that the sawtooth collapses occur during or after the stabilization of m/n = 2/1 NTMs. It is also confirmed that the minimum safety factor, qmin, is nearly unity before and after the stabilization of an m/n = 2/1 NTM. While the flux pumping by ELM-NTM coupling was reported in DIII-D, the suppression of the sawtooth collapse is observed without ELMs in this study. On the other hand, it is observed that the sawtooth precursor appears during the stabilization of the m/n = 2/1 NTM accompanying the disappearance of the fluctuation of the n = 1 helical core (HC), which is induced by the m/n = 2/1 NTM. In addition, the modulation of the toroidal rotation velocity having the frequency of the n = 1 HC is observed in the core region. Because the helical flow with HCs is a possible source of the dynamo loop voltage in tokamaks, these observations suggest that the suppression of the sawtooth collapse in JT-60U is realized by the dynamo loop voltage due to the n = 1 HC induced by the m/n = 2/1 NTM. Our result indicates that n = 1 HCs induced by other MHD modes also may induce anomalous current transport in tokamaks. | |||||
| 書誌情報 |
Plasma Physics and Controlled Fusion 巻 63, 号 8, p. 085009, 発行日 2021-06 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0741-3335 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1361-6587/ac04bb | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://iopscience.iop.org/article/10.1088/1361-6587/ac04bb | |||||
