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

Publication: Research - peer-reviewJournal article – Annual report year: 2016

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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 Dα (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.
Original languageEnglish
Article number106024
JournalNuclear Fusion
Volume56
Issue number10
Number of pages15
ISSN0029-5515
DOIs
StatePublished - 2016
CitationsWeb of Science® Times Cited: 3

    Keywords

  • Fast ions, Tomography, Tokamaks, Sawteeth, Neutral beam injection, Fast-ion D-alpha spectroscopy
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