Toroidal Alfvén eigenmodes excited by energetic electrons in EAST low-density ohmic plasmas
文献类型：期刊论文
| 作者 | Zhu, Xiang2; Qiu, Zhiyong3; Bao, Jian4; Zhang, Tao1 ; Liu, Haiqing1; Luo, Chenxi1; Tang, Tian1; Shi, Tonghui1; Chen, Dalong1; Qian, Jinping1
|
| 刊名 | NUCLEAR FUSION
 |
| 出版日期 | 2024-12-01 |
| 卷号 | 64 |
| 关键词 | energetic electron (EE) toroidal Alfv & eacute EAST n eigenmode (TAE) |
| ISSN号 | 0029-5515 |
| DOI | 10.1088/1741-4326/ad7ed7 |
| 通讯作者 | Lin, Shiyao(linsy@ipp.ac.cn) ; Zeng, Long(zenglong@tsinghua.edu.cn) |
| 英文摘要 | Operation in the quiescent regime with abundant trapped energetic electrons (EEs) has been achieved during the current flattop in EAST low-density Ohmic plasmas. This was facilitated by increasing the electron density to a specified level and subsequently reducing it slowly, resulting in the accumulation of a sufficient number of trapped EEs within the energy range of 150-250 keV. During the phase of decreasing electron density, toroidal Alfv & eacute;n eigenmodes (TAEs) were observed to be excited by these EEs, with frequencies falling within the range of about 100-300 kHz. The experimental parameters were carefully set to satisfy the resonance conditions for TAE excitation by EEs, aligning well with predictions from ideal MHD theory. Statistical analysis indicated different density dependencies between the frequencies of TAEs and the Alfv & eacute;n frequencies, due to their different radial excitation positions. The radial positions of the TAEs were found to be influenced by the energy distribution and the evolution of trapped EEs, which in turn were affected by the decay rate of electron density and loop voltage. Measurements of Hard x-rays confirmed an energy distribution characterized by a 'bump-on-tail' shape, with the TAEs observed near the energy bump. Theoretical considerations also demonstrate the possibility that the e-TAE can be driven unstable under this experiment condition even if the mode does not rotate in the electron-diamagnetic drift direction. |
| WOS关键词 | INDUCED ALFVEN EIGENMODES ; EXCITATION ; PHYSICS ; DRIVEN |
| 资助项目 | National Key R&D Program of China[2022YFE03050003] ; National Key R&D Program of China[2022YFE03070004] ; National Natural Science Foundation of China[12105186] ; Pioneer project of China National Nuclear Power Corporation |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001327902200001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National Key R&D Program of China ; National Natural Science Foundation of China ; Pioneer project of China National Nuclear Power Corporation |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/135773]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Lin, Shiyao; Zeng, Long |
| 作者单位 | 1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China 3.Chinese Acad Sci, Inst Plasma Phys, Key Lab Frontier Phys Controlled Nucl Fus, Hefei 230031, Peoples R China 4.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China 5.Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, Xiang,Qiu, Zhiyong,Bao, Jian,et al. Toroidal Alfvén eigenmodes excited by energetic electrons in EAST low-density ohmic plasmas[J]. NUCLEAR FUSION,2024,64. |
| APA | Zhu, Xiang.,Qiu, Zhiyong.,Bao, Jian.,Zhang, Tao.,Liu, Haiqing.,...&Zeng, Long.(2024).Toroidal Alfvén eigenmodes excited by energetic electrons in EAST low-density ohmic plasmas.NUCLEAR FUSION,64. |
| MLA | Zhu, Xiang,et al."Toroidal Alfvén eigenmodes excited by energetic electrons in EAST low-density ohmic plasmas".NUCLEAR FUSION 64(2024). |
入库方式： OAI收割
来源：合肥物质科学研究院
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