High-definition velocity-space tomography of fast-ion dynamics

被引：65

作者：

Salewski, M. ^{[1
]}

Geiger, B. ^{[2
]}

Jacobsen, A. S. ^{[2
]}

Hansen, P. C. ^{[3
]}

Heidbrink, W. W. ^{[4
]}

Korsholm, S. B. ^{[1
]}

Leipold, F. ^{[1
]}

Madsen, J. ^{[1
]}

Moseev, D. ^{[5
]}

Nielsen, S. K. ^{[1
]}

Nocente, M. ^{[6
,7
]}

Odstrcil, T. ^{[2
]}

Rasmussen, J. ^{[1
]}

Stagner, L. ^{[4
]}

Stejner, M. ^{[1
]}

Weiland, M. ^{[2
]}

机构：

[1] Tech Univ Denmark, Dept Phys, Lyngby, Denmark

[2] Max Planck Inst Plasma Phys, Garching, Germany

[3] Tech Univ Denmark, Dept Appl Math & Comp Sci, Lyngby, Denmark

[4] Univ Calif Irvine, Irvine, CA USA

[5] Max Planck Inst Plasma Phys, Greifswald, Germany

[6] Univ Milano Bicocca, Dept Phys, Milan, Italy

[7] CNR, Ist Fis Plasma, Milan, Italy

来源：

NUCLEAR FUSION | 2016年 / 56卷 / 10期

关键词：

fast ions; tomography; tokamaks; sawteeth; neutral beam injection; fast-ion D-alpha spectroscopy; RECONSTRUCTION;

D O I：

10.1088/0029-5515/56/10/106024

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Velocity-space tomography of the fast-ion distribution function in a fusion plasma is usually a photon-starved tomography method due to limited optical access and signal-to-noise ratio of fast-ion D-alpha (FIDA) spectroscopy as well as the strive for high-resolution images. In high-definition tomography, prior information makes up for this lack of data. We restrict the target velocity space through the measured absence of FIDA light, impose phase-space densities to be non-negative, and encode the known geometry of neutral beam injection (NBI) sources. We further use a numerical simulation as prior information to reconstruct where in velocity space the measurements and the simulation disagree. This alternative approach is demonstrated for four-view as well as for two-view FIDA measurements. The high-definition tomography tools allow us to study fast ions in sawtoothing plasmas and the formation of NBI peaks at full, half and one-third energy by time-resolved tomographic movies.

引用

页数：15

共 50 条

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