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Beam modulation and bump-on-tail effects on Alfvén eigenmode stability in DIII-D
http://hdl.handle.net/10655/00013526
http://hdl.handle.net/10655/00013526e48fc577-c18f-407f-bf94-80aab5a4d510
名前 / ファイル | ライセンス | アクション |
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13266_Nucl.fusion (9.7 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2022-11-24 | |||||
タイトル | ||||||
タイトル | Beam modulation and bump-on-tail effects on Alfvén eigenmode stability in DIII-D | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | fast ions | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Alfv´en eigenmodes | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | energetic particles | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | tokamaks | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | DIII-D tokamak | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | neutral beam heating | |||||
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 |
ZEELAND, M. A. Van
× ZEELAND, M. A. Van× BARDOCZ, L.× GONZALEZ-MARTIN, J.× HEIDBRINK, William Walter× PODESTA, Mario× AUSTIN, M.× COLLINS, C. S.× DU, Xiaodi× DUARTE, Vinícius× GARCIA-MUNOZ, Manuel× MUNARETTO, Stefano× THOME, Kathreen× TODO, Yasushi× WANG, X. |
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著者ID | ||||||
内容記述タイプ | Other | |||||
内容記述 | 0000-0002-7911-2739 | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Beam modulation effects on Alfvén eigenmode stability have been investigated in a recent DIII-D experiment and show that variations in neutral beam modulation period can have an impact on the beam driven Alfvén eigenmode spectrum and resultant fast ion transport despite similar time-averaged input power. The experiment was carried out during the current ramp phase of L-mode discharges heated with sub-Alfvénic 50–80 kV deuterium neutral beams that drive a variety of Alfvén eigenmodes unstable. The modulation period of two interleaved beams with different tangency radii was varied from shot to shot in order to modify the relative time dependent mix of the beam pitch angle distribution as well as the persistence of a bump-on-tail feature near the injection energy (a feature confirmed by imaging neutral particle analyzer measurements). As the beam modulation period is varied from 7 ms to 30 ms on/off (typical full energy slowing down time of τslow ≈ 50 ms at mid-radius), toroidicity-induced Alfvén eigenmodes (TAEs) located in the outer periphery of the plasma become intermittent and coincident with the more tangential beam. Core mode activity changes from reversed shear Alfvén eigenmodes (RSAEs) to a mix of RSAE and beta-induced Alfvén eigenmodes. Discharges with 30 ms on/off period do not have a persistent bump-on-tail feature, have the lowest average mode amplitude and least fast ion transport. Detailed analysis of an individual TAE using TRANSP kick modeling (Monte Carlo evolution of the distribution function with probabilistic 'kicks' by the AEs) and the resistive MHD code with kinetic fast ions, MEGA, find no strong role of energy gradient drive due to bump-on-tail features. Instead, the observed TAE modulation with interleaved beams is likely a pitch angle dependent result combined with slowing down of the tangential beam between pulses. For the conditions investigated, bump-on-tail contributions to TAE drive were found to be 5% or less of the total drive at any given time. | |||||
書誌情報 |
Nuclear Fusion 巻 61, 号 6, p. 066028, 発行日 2021-05-14 |
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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/abf174 | |||||
権利 | ||||||
権利情報 | This is the Accepted Manuscript version of an article accepted for publication in Nuclear Fusion. | |||||
権利 | ||||||
権利情報 | IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. | |||||
権利 | ||||||
権利情報 | The Version of Record is available online at https://doi.org/10.1088/1741-4326/abf174. | |||||
情報源 | ||||||
関連名称 | M.A. Van Zeeland et al 2021 Nucl. Fusion 61 066028 | |||||
関連サイト | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1088/1741-4326/abf174 | |||||
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 | ||||||
13266 |