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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/10655/00012874
963a9766-4c9e-487a-8c0d-e3a0f7887dee
名前 / ファイル ライセンス アクション
Nucl.Fusion57_pp072009.pdf Nucl.Fusion57_pp072009 (1.5 MB)
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Item type 学術雑誌論文 / Journal Article(1)
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

IDO, Takeshi

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ITOH, Kimitaka

× ITOH, Kimitaka

ITOH, Kimitaka

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LESUR, M.

× LESUR, M.

LESUR, M.

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OSAKABE, Masaki

× OSAKABE, Masaki

OSAKABE, Masaki

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SHIMIZU, Akihiro

× SHIMIZU, Akihiro

SHIMIZU, Akihiro

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OGAWA, Kunihoro

× OGAWA, Kunihoro

OGAWA, Kunihoro

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NISHIURA, Masaki

× NISHIURA, Masaki

NISHIURA, Masaki

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YAMADA, Ichihiro

× YAMADA, Ichihiro

YAMADA, Ichihiro

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YASUHARA, Ryo

× YASUHARA, Ryo

YASUHARA, Ryo

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Kosuga, Yusuke

× Kosuga, Yusuke

Kosuga, Yusuke

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Sasaki, Makoto

× Sasaki, Makoto

Sasaki, Makoto

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IDA, Katsumi

× IDA, Katsumi

IDA, Katsumi

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INAGAKI, Shigeru

× INAGAKI, Shigeru

INAGAKI, Shigeru

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ITOH, Sanae -I.

× ITOH, Sanae -I.

ITOH, Sanae -I.
INOUE, Sanae

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the, LHD Experiment Group

× the, LHD Experiment Group

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
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
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Cite as

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, INOUE, Sanae, the, LHD Experiment Group, 2017, Observation of subcritical geodesic acoustic mode excitation in the large helical device: International Atomic Energy Agency, 072009– p.

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