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.
Salewski, M., Geiger, B., Jacobsen, A., Hansen, P., Heidbrink, W., Korsholm, S., et al. (2016). High-definition velocity-space tomography of fast-ion dynamics. NUCLEAR FUSION, 56(10).
Citazione: | Salewski, M., Geiger, B., Jacobsen, A., Hansen, P., Heidbrink, W., Korsholm, S., et al. (2016). High-definition velocity-space tomography of fast-ion dynamics. NUCLEAR FUSION, 56(10). |
Tipo: | Articolo in rivista - Articolo scientifico |
Carattere della pubblicazione: | Scientifica |
Presenza di un coautore afferente ad Istituzioni straniere: | Si |
Titolo: | High-definition velocity-space tomography of fast-ion dynamics |
Autori: | Salewski, M; Geiger, B; Jacobsen, A; Hansen, P; Heidbrink, W; Korsholm, S; Leipold, F; Madsen, J; Moseev, D; Nielsen, S; Nocente, M; Odstrčil, T; Rasmussen, J; Stagner, L; Stejner, M; Weiland, M |
Autori: | |
Data di pubblicazione: | 2016 |
Lingua: | English |
Rivista: | NUCLEAR FUSION |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1088/0029-5515/56/10/106024 |
Appare nelle tipologie: | 01 - Articolo su rivista |