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Träfflista för sökning "WFRF:(Moseev P.) srt2:(2020-2023)"

Sökning: WFRF:(Moseev P.) > (2020-2023)

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1.
  • Schmidt, B. S., et al. (författare)
  • 4D and 5D phase-space tomography using slowing-down physics regularization
  • 2023
  • Ingår i: Nuclear Fusion. - : Institute of Physics (IOP). - 0029-5515 .- 1741-4326. ; 63:7
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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2.
  • Ochoukov, R., et al. (författare)
  • Analysis of high frequency Alfven eigenmodes observed in ASDEX Upgrade plasmas in the presence of RF-accelerated NBI ions
  • 2023
  • Ingår i: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 63:4, s. 046001-
  • Tidskriftsartikel (refereegranskat)abstract
    • High frequency Alfven eigenmodes in the ion cyclotron frequency range are actively researched on the ASDEX Upgrade tokamak (AUG). The general properties of this particular mode type are: (a) the mode is beam-driven and, if excited, can persist for the entire duration of the beam-on time window; (b) the mode is sub-cyclotron with the frequency omega similar to 0.5 omega (ci), where omega(ci) corresponds to the on-axis cyclotron frequency of the beam ions;
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