Article
Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra
Author/s | Salewski, M.
Geiger, B. Jacobsen, A.S. García Muñoz, Manuel ![]() ![]() ![]() ![]() ![]() ![]() ![]() Heidbrink, W.W. |
Department | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Publication Date | 2014-02 |
Deposit Date | 2020-08-28 |
Published in |
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Abstract | We present the first measurement of a local fast-ion 2D velocity distribution function f (v , v⊥). To this end, we heated a plasma
in ASDEX Upgrade by neutral beam injection and measured spectra of fast-ion Dα (FIDA) light ... We present the first measurement of a local fast-ion 2D velocity distribution function f (v , v⊥). To this end, we heated a plasma in ASDEX Upgrade by neutral beam injection and measured spectra of fast-ion Dα (FIDA) light from the plasma centre in three views simultaneously. The measured spectra agree very well with synthetic spectra calculated from a TRANSP/NUBEAM simulation. Based on the measured FIDA spectra alone, we infer f (v , v⊥) by tomographic inversion. Salient features of our measurement of f (v , v⊥) agree reasonably well with the simulation: the measured as well as the simulated f (v , v⊥) are lopsided towards negative velocities parallel to the magnetic field, and they have similar shapes. Further, the peaks in the simulation of f (v , v⊥) at full and half injection energies of the neutral beam also appear in the measurement at similar velocity-space locations. We expect that we can measure spectra in up to seven views simultaneously in the next ASDEX Upgrade campaign which would further improve measurements of f (v , v⊥) by tomographic inversion. |
Citation | Salewski, M., Geiger, B., Jacobsen, A.S., García Muñoz, M. y Heidbrink, W.W. (2014). Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra. Nuclear Fusion, 54 (2), 023005-. |
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