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Tomography of the positive-pitch fast-ion velocity distribution in DIII-D plasmas with Alfven eigenmodes and neoclassical tearing modes | |
Madsen, B.1; Salewski, M.1; Heidbrink, W. W.2; Stagner, L.6; Podesta, M.3; Lin, D.2; Garcia, A. V.2; Hansen, P. C.4; Huang, J.5 | |
2020-06-01 | |
发表期刊 | NUCLEAR FUSION |
ISSN | 0029-5515 |
通讯作者 | Madsen, B.(birma@fysik.dtu.dk) |
摘要 | Understanding the effect of Alfven eigenmodes (AEs) and neoclassical tearing modes (NTMs) on fast ions is highly important for fusion reactors due to potentially strong resonant interactions between the fast ions and the modes. Here, we use the four-view fast-ion D-alpha (FIDA) diagnostic installed in the DIII-D tokamak to reconstruct the fast-ion velocity distribution at two radial positions during two sequential discharges with strong and weak mode activity, respectively. The velocity-space coverage of the diagnostics, however, only allows reliable reconstructions of fast ions with positive pitches. Therefore, we suggest new tomographic inversion methods relying on prior information outside the well-diagnosed region. We find that within the population of fast ions with positive pitches, ions, at all energies, are transported away from the measurement volumes. Comparisons between the reconstructions and kick model simulations, where the mode activity is considered, reveal that low-frequency modes such as the NTMs and low-frequency AEs contribute significantly to the positive-pitch fast-ion transport in the central measurement volume, whereas TAEs and EAEs become important farther out and are responsible for decreased fast-ion confinement. |
关键词 | velocity-space tomography fast-ion D-alpha spectroscopy fast ions Alfven eigenmodes neoclassical tearing modes kick model DIII-D tokamak |
DOI | 10.1088/1741-4326/ab82b5 |
关键词[WOS] | ALPHA ; CODE ; TRANSPORT |
收录类别 | SCI |
语种 | 英语 |
资助项目 | ITPA Topical Group for Energetic Particle Physics ; Euratom research and training programme 2014-2018[633 053] ; Euratom research and training programme 2019-2020[633 053] ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences[DE-FC0204ER54 698] ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences[DE-AC02-09CH11 466] |
项目资助者 | ITPA Topical Group for Energetic Particle Physics ; Euratom research and training programme 2014-2018 ; Euratom research and training programme 2019-2020 ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences |
WOS研究方向 | Physics |
WOS类目 | Physics, Fluids & Plasmas |
WOS记录号 | WOS:000535882400001 |
出版者 | IOP PUBLISHING LTD |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.hfcas.ac.cn:8080/handle/334002/103142 |
专题 | 中国科学院合肥物质科学研究院 |
通讯作者 | Madsen, B. |
作者单位 | 1.Tech Univ Denmark, Dept Phys, Lyngby, Denmark 2.Univ Calif Irvine, Dept Phys & Astron, Irvine, CA USA 3.Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA 4.Tech Univ Denmark, Dept Appl Math & Comp Sci, Lyngby, Denmark 5.Chinese Acad Sci, Inst Plasma Phys, PO 1126, Hefei 230031, Anhui, Peoples R China 6.Oak Ridge Inst Sci & Educ, Oak Ridge, TN USA |
推荐引用方式 GB/T 7714 | Madsen, B.,Salewski, M.,Heidbrink, W. W.,et al. Tomography of the positive-pitch fast-ion velocity distribution in DIII-D plasmas with Alfven eigenmodes and neoclassical tearing modes[J]. NUCLEAR FUSION,2020,60. |
APA | Madsen, B..,Salewski, M..,Heidbrink, W. W..,Stagner, L..,Podesta, M..,...&Huang, J..(2020).Tomography of the positive-pitch fast-ion velocity distribution in DIII-D plasmas with Alfven eigenmodes and neoclassical tearing modes.NUCLEAR FUSION,60. |
MLA | Madsen, B.,et al."Tomography of the positive-pitch fast-ion velocity distribution in DIII-D plasmas with Alfven eigenmodes and neoclassical tearing modes".NUCLEAR FUSION 60(2020). |
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