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Observation of subcritical geodesic acoustic mode excitation in the large helical device
http://hdl.handle.net/10655/00012874
http://hdl.handle.net/10655/00012874963a9766-4c9e-487a-8c0d-e3a0f7887dee
名前 / ファイル | ライセンス | アクション |
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Nucl.Fusion57_pp072009 (1.5 MB)
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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 | Observation of subcritical geodesic acoustic mode excitation in the large helical device | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | GAM | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | EGAM | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | subcritical instability | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | abrupt excitation | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | energetic particle | |||||
キーワード | ||||||
主題Scheme | Other | |||||
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 |
IDO, Takeshi
× IDO, Takeshi× ITOH, Kimitaka× LESUR, M.× OSAKABE, Masaki× SHIMIZU, Akihiro× OGAWA, Kunihoro× NISHIURA, Masaki× YAMADA, Ichihiro× YASUHARA, Ryo× Kosuga, Yusuke× Sasaki, Makoto× IDA, Katsumi× INAGAKI, Shigeru× ITOH, Sanae -I.× the, LHD Experiment Group |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The abrupt and strong excitation of the geodesic acoustic mode (GAM) has been found in the large helical device (LHD), when the frequency of a chirping energetic particle-driven GAM (EGAM) approaches twice that of the GAM frequency. The temporal evolution of the phase relation between the abrupt GAM and the chirping EGAM is common in all events. The result indicates a coupling between the GAM and the EGAM. In addition, the nonlinear evolution of the growth rate of the GAM is observed, and there is a threshold in the amplitude of the GAM for the appearance of nonlinear behavior. A threshold in the amplitude of the EGAM for the abrupt excitation of the GAM is also observed. According to one theory (Lesur et al 2016 Phys. Rev. Lett. 116 015003, Itoh et al 2016 Plasma Phys. Rep. 42 418) the observed abrupt phenomenon can be interpreted as the excitation of the subcritical instability of the GAM. The excitation of a subcritical instability requires a trigger and a seed with sufficient amplitude. The observed threshold in the amplitude of the GAM seems to correspond with the threshold in the seed, and the threshold in the amplitude of the EGAM seems to correspond with the threshold in the magnitude of the trigger. Thus, the observed threshold supports the interpretation that the abrupt phenomenon is the excitation of a subcritical instability of the GAM. | |||||
書誌情報 |
Nuclear Fusion 巻 57, 号 7, p. 072009, 発行日 2017-04-19 |
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出版者 | ||||||
出版者 | IOP Publishing | |||||
出版者 | ||||||
出版者 | International Atomic Energy Agency | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0029-5515 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00759871 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1088/1741-4326/aa665a | |||||
権利 | ||||||
権利情報 | This is the Accepted Manuscript version of an article accepted for publication in Nuclear Fusion. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1741-4326/aa665a. | |||||
権利 | ||||||
権利情報 | © 2017 IAEA, Vienna | |||||
情報源 | ||||||
関連名称 | T. Ido et al 2017 Nucl. Fusion 57 072009 | |||||
関連サイト | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1088/1741-4326/aa665a | |||||
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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