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Nonlinear Excitation of Subcritical Instabilities in a Toroidal Plasma
http://hdl.handle.net/10655/00012878
http://hdl.handle.net/10655/00012878d80a2f40-08a6-44a7-9a6c-b95c6c7dde82
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
Phys.Rev.Lett.116_pp015003 (335.1 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||||||||||||||||||||||
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| 公開日 | 2022-01-04 | |||||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||||
| タイトル | Nonlinear Excitation of Subcritical Instabilities in a Toroidal 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 | |||||||||||||||||||||||||
| 著者 |
LESUR, M.
× LESUR, M.
× ITOH, Kimitaka
× IDO, Takeshi
× OSAKABE, Masaki
× OGAWA, Kunihoro
× SHIMIZU, Akihiro
× Sasaki, Makoto
× IDA, Katsumi
× INAGAKI, Shigeru
× ITOH, Sanae-I.
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| 抄録 | ||||||||||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||||||||||
| 内容記述 | In a collisionless plasma, it is known that linearly stable modes can be destabilized (subcritically) by the presence of structures in phase space. However, nonlinear growth requires the presence of a seed structure with a relatively large threshold in amplitude. We demonstrate that, in the presence of another, linearly unstable (supercritical) mode, wave-wave coupling can provide a seed, which is significantly below the threshold, but can still grow by (and only by) the collaboration of fluid and kinetic nonlinearities. By modeling the subcritical mode kinetically, and the impact of the supercritical mode by simple wave-wave coupling equations, it is shown that this new kind of subcritical instability can be triggered, even when the frequency of the supercritical mode is rapidly sweeping. The model is applied to the bursty onset of geodesic acoustic modes in a LHD experiment. The model recovers several key features such as relative amplitude, time scales, and phase relations. It suggests that the strongest bursts are subcritical instabilities, driven by this mechanism of combined fluid and kinetic nonlinearities. | |||||||||||||||||||||||||
| 書誌情報 |
Physical Review Letters 巻 116, p. 015003, 発行日 2016-01-08 |
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| 出版者 | ||||||||||||||||||||||||||
| 出版者 | APS Physics | |||||||||||||||||||||||||
| ISSN | ||||||||||||||||||||||||||
| 収録物識別子タイプ | ISSN | |||||||||||||||||||||||||
| 収録物識別子 | 00319007 | |||||||||||||||||||||||||
| 書誌レコードID | ||||||||||||||||||||||||||
| 収録物識別子タイプ | NCID | |||||||||||||||||||||||||
| 収録物識別子 | AA00773679 | |||||||||||||||||||||||||
| DOI | ||||||||||||||||||||||||||
| 関連タイプ | isVersionOf | |||||||||||||||||||||||||
| 識別子タイプ | DOI | |||||||||||||||||||||||||
| 関連識別子 | 10.1103/PhysRevLett.116.015003 | |||||||||||||||||||||||||
| 権利 | ||||||||||||||||||||||||||
| 権利情報 | © 2016 American Physical Society | |||||||||||||||||||||||||
| 情報源 | ||||||||||||||||||||||||||
| 関連名称 | Nonlinear Excitation of Subcritical Instabilities in a Toroidal Plasma M. Lesur, K. Itoh, T. Ido, M. Osakabe, K. Ogawa, A. Shimizu, M. Sasaki, K. Ida, S. Inagaki, S.-I. Itoh, and the LHD Experiment Group Phys. Rev. Lett. 116, 015003 – Published 8 January 2016 | |||||||||||||||||||||||||
| 関連サイト | ||||||||||||||||||||||||||
| 識別子タイプ | DOI | |||||||||||||||||||||||||
| 関連識別子 | https://doi.org/10.1103/PhysRevLett.116.015003 | |||||||||||||||||||||||||
| 関連名称 | Publisher version | |||||||||||||||||||||||||
| 著者版フラグ | ||||||||||||||||||||||||||
| 出版タイプ | AM | |||||||||||||||||||||||||
| 出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||||||||||||||||||||||
| NAIS | ||||||||||||||||||||||||||
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LESUR, M., ITOH, Kimitaka, IDO, Takeshi, OSAKABE, Masaki, OGAWA, Kunihoro, SHIMIZU, Akihiro, Sasaki, Makoto, IDA, Katsumi, INAGAKI, Shigeru, ITOH, Sanae-I., 2016, Nonlinear Excitation of Subcritical Instabilities in a Toroidal Plasma: APS Physics, 015003– p.
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