Tomography of the positive-pitch fast-ion velocity distribution in DIII-D plasmas with Alfven eigenmodes and neoclassical tearing modes

doi:10.1088/1741-4326/ab82b5

	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
刊名	NUCLEAR FUSION
	2020-06-01
卷号	60
关键词	velocity-space tomography fast-ion D-alpha spectroscopy fast ions Alfven eigenmodes neoclassical tearing modes kick model DIII-D tokamak
ISSN号	0029-5515
DOI	10.1088/1741-4326/ab82b5
通讯作者	Madsen, B.(birma@fysik.dtu.dk)
英文摘要	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.
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]
WOS关键词	ALPHA ; CODE ; TRANSPORT
WOS研究方向	Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000535882400001
资助机构	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
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/103141]
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).