We compute reconstructions of 4D and 5D fast-ion phase-space distribution functions in fusion plasmas from synthetic projections of these functions. The fast-ion phase-space distribution functions originating from neutral beam injection (NBI) at TCV and Wendelstein 7-X (W7-X) at full, half, and one-third injection energies can be distinguished and particle densities of each component inferred based on 20 synthetic spectra of projected velocities at TCV and 680 at W7-X. Further, we demonstrate that an expansion into a basis of slowing-down distribution functions is equivalent to regularization using slowing-down physics as prior information. Using this technique in a Tikhonov formulation, we infer the particle density fractions for each NBI energy for each NBI beam from synthetic measurements, resulting in six unknowns at TCV and 24 unknowns at W7-X. Additionally, we show that installing 40 LOS in each of 17 ports at W7-X, providing full beam coverage and almost full angle coverage, produces the highest quality reconstructions.
4D and 5D phase-space tomography using slowing-down physics regularization
Schmidt B.S.; Salewski M.; Moseev D.; Baquero-Ruiz M.; Hansen P.C.; Eriksson J.; Ford O.; Gorini G.; Jarleblad H.; Kazakov Y.O.; Kulla D.; Lazerson S.; Mencke J.E.; Mykytchuk D.; Nocente M.; Poloskei P.; Rud M.; Snicker A.; Stagner L.; Akaslompolo S.
ID | 482419 |
---|---|
DOI | 10.1088/1741-4326/acd6a6 |
PRODUCT TYPE | Journal Article |
LAST UPDATE | 2023-06-19T10:52:49Z |
EU PROJECT | EUROfusion |
---|---|
TITLE | Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium |
FOUNDING PROGRAM | H2020 |