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"BAAE" instabilities observed without fast ion drive
https://repo.qst.go.jp/records/81229
https://repo.qst.go.jp/records/81229fa17c197-d633-4ecb-a2e7-fb9b27cd2508
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-12-07 | |||||
| タイトル | ||||||
| タイトル | "BAAE" instabilities observed without fast ion drive | |||||
| 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 |
W Heidbrink, William
× W Heidbrink, William× A Van Zeeland, Michael× E Austin, Max× Bierwage, Andreas× Chen, Liu× Choi, Gyungjin× Lauber, Philipp× Lin, Zhihong× R McKee, George× A Spong, Donald× Bierwage, Andreas |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The instability that was previously identified [Phys. Pl. 16 (2009) 056107] as a fast-ion driven beta-induced Alfven-acoustic eigenmode (BAAE) in DIII-D was misidentified. In a dedicated experiment, low frequency modes (LFM) with characteristic ``Christmas light'' patterns of brief instability linked to the safety factor evolution occur in plasmas with electron temperature T_e >= 2.1 keV but modest beta. To isolate the importance of different driving gradients on these modes, the electron cyclotron heating power and 80 keV, sub-Alfvenic neutral beams are altered for 50-100 ms durations in reproducible discharges. Although beta-induced Alfven eigenmodes and reversed-shear Alfven eigenmodes stabilize when beam injection ceases (as expected for a fast-ion driven instability), the low frequency modes that were called BAAEs persist. Data mining reveals that characteristic LFM instabilities can occur in discharges with no beam heating but strong electron cyclotron heating. A large database of over 1000 discharges shows that LFMs are only unstable in plasmas with hot electrons but modest overall beta. The experimental LFMs have low frequencies (comparable to diamagnetic drift frequencies) in the plasma frame, occur near the minimum of the safety factor q_{min}, and appear when q_{min} is close to rational values. Theoretical analysis suggests that the LFMs are a low frequency reactive instability of predominately Alfvenic polarization. | |||||
| 書誌情報 |
Nuclear Fusion 巻 61, 号 1, p. 016029-1-016029-16, 発行日 2020-12 |
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| 出版者 | ||||||
| 出版者 | IoP Publishing, International Atomic Energy Agency, EURATOM | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0029-5515 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1741-4326/abc4c3 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://iopscience.iop.org/article/10.1088/1741-4326/abc4c3 | |||||
